BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to embryonic stems cells, and more specifically to a process for obtaining human embryonic stem cells using parthenogenically activated oocytes.
2. Background Information
Human embryonic stem cells (ES) cells are pluripotent cells that can differentiate into a large array of cell types. When injected into immune-deficient mice, embryonic stem cells form differentiated tumors (teratomas). However, embryonic stem cells that are induced in vitro to form embryoid bodies (EBs) provide a source of embryonic stem cell lines that are amenable to differentiation into multiple cell types characteristic of several tissues under certain growth conditions. For example, ES cells become differentiated into neurons in the presence of nerve growth factor and retinoic acid.
Human ES cells and their differentiated progeny are important sources of normal human cells for therapeutic transplantation and for drug testing and development. Required by both of these goals is the provision of sufficient cells that are differentiated into tissue types suitable for a patient's needs or the appropriate pharmacological test. Associated with this is a need for an efficient and reliable method of producing differentiated cells from embryonic stem cells.
Currently, human embryonic stem cells (hES) are derived from three sources: blastocysts remaining after infertility treatments and donated for research, blastocysts generated from donated gametes (oocytes and sperm), and the products of nuclear transfer (NT). Cadaveric fetal tissue is the only source of human embryonic germ cells (hEG). hES and hEG cells offer remarkable scientific and therapeutic possibilities, involving potential for generating more specialized cells or tissues. Ethical concerns about the sources of hES and hEG cells, however, and fears that use of NT for research could lead to use of NT to produce a human being, have fostered a great deal of public discussion and debate.
Parthenogenic activation of mammalian oocytes may be used as an alternative to fertilization by sperm/NT to prepare oocytes for embryonic stem cell generation. Parthenogenic activation is the production of embryonic cells, with or without eventual development into an adult, from a female gamete in the absence of any contribution from a male gamete.
Parthenogenetic activation of mammalian oocytes has been induced in a number of ways. Using an electrical stimulus to induce activation is of particular interest because electrofusion is part of the current nuclear transfer procedure. Parthenogenetic activation in vitro by electrical stimulation with electrofusion apparatus used for embryonic cell-oocyte membrane fusion has been reported.
Mouse oocytes have been activated by exposure to Ca+2—Mg+2 free medium, medium containing hyaluronidase, exposure to ethanol, Ca+2 ionophores or chelators, inhibitors of protein synthesis, and electrical stimulation. These procedures have led to high rates of parthenogenic activation and development of mouse oocytes, but did not activate and/or lead to a lower development rate of young bovine oocytes. Further, fertilization and parthenogenic activation of mouse oocytes is also dependent on post ovulatory aging.
Activation of bovine oocytes has been reported by ethanol, electrical stimulation, exposure to room temperature, and a combination of electrical stimulation and protein inhibition with cycloheximide. While these processes are thought to raise intracellular Ca+2, they are most successful when the oocytes have been aged for more than 28 hours.
SUMMARY OF THE INVENTION
The present invention is based on the seminal discovery that certain conditions are optimal for parthenogenically activating human oocytes.
In one embodiment, a method of producing human stem cells is provided including parthenogenetically activating an oocyte, where activation includes contacting the oocyte with an ionophore at high oxygen (O2) tension and contacting the oocyte with a serine-threonine kinase inhibitor under low O2 tension, cultivating the activated oocyte at low O2 tension until blastocyst formation, transferring the blastocyst to a layer of feeder cells, and culturing the transferred blastocyst under high O2 tension, mechanically isolating an inner cell mass (ICM) from trophectoderm of the blastocyst, and culturing the cells of the ICM on a layer of feeder cells, where culturing the ICM cells is carried out under high O2 tension. Preferably, the oocyte is human.
In a related aspect, low O2 tension is maintained by incubation in a gas mixture environment comprising an O2 concentration of about 2% O2 to about 5% O2, where the gas mixture environment further comprises about 5% CO2 and about 90% nitrogen (N2) to 93% N2.
In another embodiment, a method of activating human metaphase II oocytes is provided including incubating human metaphase II oocytes in in vitro fertilization (IVF) media under high O2 tension, activating by incubating the cells in IVF media comprising an ionophore under high O2 tension, and subsequently incubating the cells in IVF media comprising a serine-threonine kinase inhibitor (STKI) under low O2 tension, and incubating the STKI treated cells until blastocyst formation under low O2 tension, where inner cell masses (ICM) obtained from the blastocyst produce culturable stem cells. High O2 tension may be maintained by incubating the cells in a gas mixture environment having about 5% CO2, about 20% O2, and about 75% N2.
In a related aspect, the O2 tension for the incubating steps subsequent to activation is maintained by incubating the cells in a gas mixture environment comprising an O2 concentration of about 2% O2 to about 5% O2, where the gas mixture environment further includes about 5% CO2 and about 90% N2 to about 93% N2.
In another related aspect, the IVF media is essentially free of non-human products.
In a further related aspect, isolated oocytes prepared by the invention methods are provided, including isolated inner cell masses (ICM) prepared from such oocytes and corresponding stem cells isolated therefrom.
In another embodiment, human parthenogenic activation of mammalian oocytes resulting in embryogenic stem cells and their differentiated progeny is provided. Such cells and progeny are substantially isogenic to the oocyte donor, thus allowing for autologous transplantation of cells relative to the oocyte donor, and rejection by the oocyte donor's immune system is typically avoided.
In a related aspect, a cell bank of hES cell lines derived from parthenogenically activated oocytes is provided.
In one embodiment, a method for producing human stem cells from a cryopreserved oocyte or parthenote is provided, including microinjecting into the cytoplasm of the oocyte or parthenote a cryopreservation agent, freezing the oocyte or parthenote to a cryogenic temperature to cause it to enter a dormant state, storing the oocyte or parthenote in the dormant state, thawing the oocyte or parthenote, parthenogenically activating the oocyte, where the activation includes contacting the oocyte with an ionophore at high O2 tension and contacting the oocyte with a serine-threonine kinase inhibitor under low O2 tension, cultivating the parthenote or activated oocyte under low O2 tension until blastocyst formation, isolating an inner cell mass (ICM) from the trophectoderm of the blastocyst, and culturing the cells of the ICM on a layer of feeder cells, where culturing is carried out under high O2 tension.
In another embodiment, autologous stem cells derived from parthenogenetically activated oocytes from a human donor are provided. In one aspect, the stem cells possess a substantially identical haplotype as the donor cell. In a related aspect, stem cells are substantially identical genetically to the donor cell.
In one aspect, a stem cell is identified as a full sibling of the donor according to single nucleotide polymorphism (SNP) markers. In another aspect, a stem cell is genomically imprinted according to donor origin.
In one embodiment, a differentiated cell derived from a stem cell obtained from a parthenogenetically activated oocyte from a human donor is disclosed. In a related aspect, the differentiated cell includes, but is not limited to, a neuronal cell, a cardiac cell, a smooth muscle cell, a striated muscle cell, an endothelial cell, an osteoblast, an oligodendrocyte, a hematopoietic cell, an adipose cell, a stromal cell, a chondrocyte, an astrocyte, a dendritic cell, a keratinocyte, a pancreatic islet, a lymphoid precursor cell, a mast cell, a mesodermal cell, and an endodermal cell. In a further related aspect, the differentiated cell expresses one or more markers, including but not limited to, neurofiliment 68, NCAM, beta III-tubulin, GFAP, alpha-actinin, desmin, PECAM-1, VE-Cadherin, alpha-fetoprotein, or a combination thereof.
In another embodiment, a cell line comprising autologous stem cells is disclosed, where the stem cells are derived from parthenogenetically activated oocytes from a human donor. In one aspect, the cells do not express SSEA-1. In another aspect, the cells of the cell line give rise to ectodermal, mesodermal, and endodermal germ lines.
In one embodiment, a cell bank is disclosed including cryopreserved parthenotes, where the parthenotes are derived from parthenogenetically activated oocytes from one or more human donors. In a related aspect, the parthenotes have been cultivated under low O2 tension until blastocyst formation.
In one embodiment, a cell bank is disclosed including cryopreserved autologous stem cells, where the stem cells are derived from parthenogenetically activated oocytes from one or more human donors.
In another embodiment, a method of treating a subject in need thereof, comprising administering a cellular composition comprising differentiated cells, wherein the differentiated cells are derived from a stem cell obtained from a parthenogenetically activated oocyte from a human donor. In one aspect, the differentiated cell is selected from the group consisting of a neuronal cell, cardiac cell, smooth muscle cell, striated muscle cell, endothelial cell, osteoblast, oligodendrocyte, hematopoietic cell, adipose cell, stromal cell, chondrocyte, astrocyte, dendritic cell, keratinocyte, pancreatic islet, lymphoid precursor cell, mast cell, mesodermal cell, and endodermal cell.
In a related aspect, the subject presents a disease selected from the group consisting of Parkinson's disease, Huntington's disease, Alzheimer's disease, ALS, spinal cord defects or injuries, multiple sclerosis, muscular dystrophy, cystic fibrosis, liver disease, diabetes, heart disease, retinal disease (such as macular degeneration and retinitis pigmentosa), cartilage defects or injuries, burns, foot ulcers, vascular disease, urinary tract disease, AIDS, and cancer.
In one embodiment, a method of generating cloned human embryonic stem cells is disclosed, including removing a first pronuclei from a previously fertilized human oocyte, transferring a second pro-nuclei into the enucleated oocyte, where the second pro-nuclei is derived from a donor oocyte or an oocyte from the mother of the donor, or a parthenogenetically activated oocyte, where the pro-nuclei of the oocyte has been replaced by the nucleus of a donor somatic cell prior to activation, and cultivating the resulting oocyte until blastocyst formation, where an inner cell mass from the blastocyst contains the embryonic stem cells.
Exemplary methods and compositions according to this invention are described in greater detail below.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1A shows a micrograph of the surface marker expression of alkaline phosphatase for the parthenogenically derived hES cells.
FIG. 1B shows a micrograph of the expression for the surface marker Oct4.
FIG. 1C shows a micrograph of the expression for the surface marker SSEA-1.
FIG. 1D shows a micrograph of the expression for the surface marker SSEA-3.
FIG. 1E shows a micrograph of the expression for the surface marker SSEA-4.
FIG. 1F shows a micrograph of the expression for the surface marker TRA-1-60.
FIG. 1G shows a micrograph of the expression for the surface marker TRA-1-81.
FIG. 2A shows the analysis of telomerase activity for the parthenogenically derived hES cells. 500, 1000, and 10000 (units) of extract was used to perform the analysis. ΔH-heat treated test extract (negative control); positive control-telomerase positive cells; CHAPS-lysis buffer; TSR8-control template.
FIG. 2B shows a micrograph of embryoid body formation from parthenogenically derived hES cells, 9 day culture.
FIG. 2C shows a micrograph of embryoid body formation from parthenogenically derived hES cells, 10 day culture.
FIG. 2D illustrates the karyotype of parthenogenically derived hES cells.
FIG. 2E shows the results from DNA finger printing analysis of parthenogenically derived hES cells. 1—DNA from the blood of the oocyte donor; 2—DNA from the parthenogenic hES cells derived from the same donor; 3—DNA from human feeder fibroblasts.
FIG. 3 shows a Northern blot characterizing the expression of genes associated with genomic imprinting. DNA probes: SNRPN, Peg1—2, Peg1_A, H19, and GAPDH (as an internal control). NSF, neonatal skin fibroblasts; hES, human embryonic stem cell line derived from fertilized oocytes; 1, phESC-1; 2, phESC-3, 3, phESC-4, 4, phESC-5; 5, phESC-6; 6 phESC-7. NSF RT−, hES RT−, 1 RT− are negative controls.
FIG. 4 shows the differentiation of phESC into derivatives of all three germ layers. Ectoderm differentiation is presented by positive immunocytochemical staining for neuron specific markers 68 (A), NCAM (B), beta III-tubulin (C) and glial cell marker GFAP (D, M). Differentiated cells were positive for mesodermal markers: muscle specific alpha actinin (G) and desmin (J), endothelial markers PECAM-1 (E) and VE-Cadherin (F). Endoderm differentiation is presented by positive staining for alpha-fetoprotein (H, L). The phESC produce pigmented epithelial-like cells (I, K). Magnification (I)×100; (A-H, J-M),×400.
FIG. 5 shows the characterization of phESC lines for specific markers. Undifferentiated colonies of phESC on human feeder layer cells (A-F), negative staining for SSEA-1 (G-L), expression of cell surface markers SSEA-3 (M-R), SSEA-4 (S—X). Magnification (A) to (E)×100; (F)×200; (G) to (X)×400. Alkaline phosphatase positive staining of phESC colonies on feeder cells (A-F), OCT-4 (G-L), TRA-1-60 (K—R) and TRA-1-81 (S—X). Magnification (A, B, O, R)×100; (C—F, M, S, X)×200; (G-L, N, P, Q, T-W)×400.
FIG. 6 demonstrates that phESC cells possess high levels of telomerase activity by comparison with positive control cells: “+”-extract from 500 cells; “−”-heat treated cell extract with inactivated telomerase; “Control +”-telomerase positive cell extract (applied with TRAPEZE Kit); “B”-CHAPS lysis buffer, primer-dimer/PCR contamination control; TSR8-telomerase quantitative control template (0.1 and 0.2 amole/μl); “M”-marker, DNA ladder.
FIG. 7 shows the G-banded karyotyping of phESC lines. The phESC-1 (A), phESC-3 (B), phESC-4 (C), phESC-5 (D) and phESC-6 (E) lines have normal 46, XX karyotype. The phESC-7 line has 47, XXX karyotype (F).
DETAILED DESCRIPTION OF THE INVENTION
Before the present composition, methods, and culturing methodologies are described, it is to be understood that this invention is not limited to particular compositions, methods, and experimental conditions described, as such compositions, methods, and conditions may vary. It is also to be understood that the terminology used herein is for purposes of describing particular embodiments only, and is not intended to be limiting, since the scope of the present invention will be limited only in the appended claims.
As used in this specification and the appended claims, the singular forms “a”, “an”, and “the” include plural references unless the context clearly dictates otherwise. Thus, for example, references to “the method” includes one or more methods, and/or steps of the type described herein which will become apparent to those persons skilled in the art upon reading this disclosure and so forth.
“Differentiation” refers to a change that occurs in cells to cause those cells to assume certain specialized functions and to lose the ability to change into certain other specialized functional units. Cells capable of differentiation may be any of totipotent, pluripotent or multipotent cells. Differentiation may be partial or complete with respect to mature adult cells.
Gynogenesis refers to the production of an embryo containing a discernible trophectoderm and inner cell mass that results upon activation of a cell, such as an oocyte, or other embryonic cell type, containing mammalian DNA of all female origin, preferably human female origin, e.g., human or non-human primate oocyte DNA. Such female mammalian DNA may be genetically modified, e.g., by insertion, deletion or substitution of at least one DNA sequence, or may be unmodified. For example, the DNA may be modified by the insertion or deletion of desired coding sequences, or sequences that promote or inhibit embryogenesis. Typically, such an embryo will be obtained by in vitro activation of an oocyte that contains DNA of all female origin. Gynogenesis is inclusive of parthenogenesis which is defined below. It also includes activation methods where the spermatozoal DNA does not contribute to the DNA in the activated oocyte.
In a related aspect, oocytes are obtained from superovulating subjects prepared for IVF. “Superovulation” techniques, such as treatment of a female subject with hormones, used in IVF are designed to stimulate the ovaries to produce several eggs (oocytes) rather than the usual single egg as in a natural cycle.
The medications required to boost egg production may include, but are not limited to the following: Lupron (gonadotropin releasing hormone-agonist), Orgalutran, Antagon or Cetrotide (gonadotropin releasing hormone-antagonist), Follistim, Bravelle or Gonal-F (FSH, follicle stimulating hormone), Repronex (combination of FSH and LH, luteinizing hormone), and Pregnyl or Novarel (hCG, human chorionic gonadotropin).
In a related aspect, collection of eggs can be performed under transvaginal ultrasound guidance. To accomplish this, a needle is inserted (e.g., under IV sedation) through the vaginal wall into the ovaries using ultrasound to locate each follicle. The follicular fluid is drawn up into a test tube to obtain the eggs.
“Parthenogenesis” (“parthenogenically activated” and “parthenogenetically activated” is used interchangeably) the process by which activation of the oocyte occurs in the absence of sperm penetration, and refers to the development of an early stage embryo comprising trophectoderm and inner cell mass that is obtained by activation of an oocyte or embryonic cell, e.g., blastomere, comprising DNA of all female origin. In a related aspect, a “parthenote” refers to the resulting cell obtained by such activation. In another related aspect, “blastocyst” refers to a cleavage stage of a fertilized or activated oocyte comprising a hollow ball of cells made of outer trophoblast cells and an inner cell mass (ICM). In a further related aspect, “blastocyst formation” refers to the process, after oocyte fertilization or activation, where the oocyte is subsequently cultured in media for a time to enable it to develop into a hollow ball of cells made of outer trophoblast cells and ICM (e.g., 5 to 6 days).
In one embodiment, the process of creating cloned human embryonic stem cell line by parthenogenetically activated oocytes is disclosed. While pathogenesis is not an uncommon form of reproduction in nature, mammals are not known to be capable of this form of reproduction. However, a 10% rate of spontaneous parthenogenesis can be found in oocytes from females of the inbred mouse strain LT/Sv (Ozil and Huneau, Development (2001) 128:917-928; Vrana et al., Proc Natl Acad Sci USA (2003) 100(Suppl 1):11911-11916; Berkowitz and Goldstein, New Eng J Med (1996) 335(23):1740-1748). Oocytes from placental mammals can be induced to undergo parthenogenesis in vitro; however, embryonic development is unsuccessful.
Following parthenogenic activation of mammalian oocytes and transfer of the activated oocyte into a surrogate mother, there is limited embryonic survival: ten days in mice; 21 days in sheep; 29 days in pigs; and 11.5 days in rabbits (Kure-bayashi et al., Theriogenology (2000) 53:1105-1119; Hagemann et al., Mol Reprod Dev (1998) 50:154-162; Surani and Barton, Science (1983) 222:1034-1036). The reason for this arrested development is likely due to genetic imprinting. It has been shown that maternal and paternal genomes are epigentically different and that both sets are required for successful embryonic development (Surani, Cell (1998) 93:309-312; Sasaki et al., (1992) 6:1843-1856). In parthenotes, all of the genetic material should be of maternal origin, a therefore should lack paternal imprinting. Paternal imprinting is thought to be responsible for extra-embryo tissue development, thus the development of trophoblastic tissue following fertilization of an enucleated oocyte (Stevens, Nature (1978) 276:266-267). In animals, therefore, enucleated zygotes may be useful for nuclear transfer with subsequent parthenogenic activation.
Mammalian parthenotes undergo only limited development with eventual death of the embryo. In Macac fascicularis, only 14 percent of oocytes in stage II metaphase following in vitro Parthenogenetic activation developed to the blastocyst stage following 8 days of culture (Monk, Genes Dev (1988) 2:921-925). Similarly, 12 percent of human oocytes that were parthenogenetically activated in vitro following nuclear transfer developed to the blastocyst state (Monk, 1988). In both cases, one stem cell line was created.
Embryos formed in spontaneously activated parthenotes in virgin females of the LT/Sv inbred mouse strain die within a few days. When nuclear transfer is performed from cells comprising the inner cell mass (ICM) of these embryos into fertilized enucleated C57BL/6j mouse oocytes, cloned mice with the LT/Sv genome are obtained (Kaufman et al., Nature (1977) 265:53-55). Thus, the use of a fertilized oocyte allows for full-term development of a parthenote. In one aspect, a fertilized enucleated human oocyte can be used to support development of a parthenogenetic embryo containing a donor's nuclei until the blastocyst stage.
In one embodiment, the pronuclei of a donor's oocyte or from the oocyte of the mother of a donor, following parthenogenetic activation, can be transferred into a fertilized human oocyte from which the male and female pronuclei have been extracted.
In another embodiment, a two stage process is disclosed for generating human stem cells including transferring the nucleus of a donor's somatic cell into a donor oocyte, where the oocyte is subsequently activated by parthenogenesis and transferring the pronuclei of the activated oocyte into a fertilized oocyte, where the male and female pronuclei have been extracted.
In another embodiment, the nucleus from a donor's somatic cell can be transferred into a fertilized enucleated human oocyte with subsequent parthenogenetic activation. The three embodiments above are illustrated by the following flow diagrams:
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Case 1
Female patient →Remove oocyte →Parthenogenetic →Remove →Add pronuclei to
activationpronucleienucleated fertilized
oocyte
Male patient →Obtain oocyte from →Parthenogenetic →Remove →Add pronuclei to
patient's motheractivationpronucleienucleated fertilized
oocyte
Case 2
Obtain donor →Remove →Add nucleus from →Parthenogenetic →Remove →Add pronuclei
oocytepronucleipatient's somaticactivationpronucleito enucleated
cell using nuclearfertilized
transferoocyte
Case 3
Obtain donor oocyte →Fertilize →Remove nucleus →Add patient's →Parthenogenetic
somatic cellactivation
nucleus
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“Pluripotent cell” refers to a cell derived from an embryo produced by activation of a cell containing DNA of all female or male origin that can be maintained in vitro for prolonged, theoretically indefinite period of time in an undifferentiated state, that can give rise to different differentiated tissue types, i.e., ectoderm, mesoderm, and endoderm. The pluripotent state of the cells is preferably maintained by culturing inner cell mass or cells derived from the inner cell mass of an embryo produced by androgenetic or gynogenetic methods under appropriate conditions, for example, by culturing on a fibroblast feeder layer or another feeder layer or culture that includes leukemia inhibitory factor (LIF). The pluripotent state of such cultured cells can be confirmed by various methods, e.g., (i) confirming the expression of markers characteristic of pluripotent cells; (ii) production of chimeric animals that contain cells that express the genotype of the pluripotent cells; (iii) injection of cells into animals, e.g., SCID mice, with the production of different differentiated cell types in vivo; and (iv) observation of the differentiation of the cells (e.g., when cultured in the absence of feeder layer or LIF) into embryoid bodies and other differentiated cell types in vitro.
“Diploid cell” refers to a cell, e.g., an oocyte or blastomere, having a diploid DNA content of all male or female origin.
“Haploid cell” refers to a cell, e.g., an oocyte or blastomere, having a haploid DNA content, where the haploid DNA is of all male or female origin.
Activation refers to a process where a fertilized or unfertilized oocyte, for example, but not limited to, in metaphase II of meiosis, undergoes a process typically including separation of the chromatid pairs, extrusion of the second polar body, resulting in an oocyte having a haploid number of chromosomes, each with one chromatid. Activation includes methods whereby a cell containing DNA of all male or female origin is induced to develop into an embryo that has a discernible inner cell mass and trophectoderm, which is useful for producing pluripotent cells but which is itself is likely to be incapable of developing into a viable offspring. Activation may be carried out, for example, under one of the following conditions: (1) conditions that do not cause second polar body extrusion; (ii) conditions that cause polar body extrusion but where the polar body extrusion is inhibited; or (iii) conditions that inhibit first cell division of the haploid oocyte.
“Metaphase II” refers to a stage of cell development where the DNA content of a cell consists of a haploid number of chromosomes with each chromosome represented by two chromatids.
In one embodiment, metaphase II oocytes are activated by incubating oocytes under various O2 tension gas environments. In a related aspect, the low O2 tension gas environment is created by a gas mixture comprising an O2 concentration of about 2%, 3%, 4%, or 5%. In a further related aspect, the gas mixture comprises about 5% CO2. Further, the gas mixture comprises about 90% N2, 91% N2, or 93% N2. This gas mixture is to be distinguished from 5% CO2 air, which is approximately about 5% CO2, 20% O2, and 75% N2.
“O2 tension” refers to the partial pressure (pressure exerted by a single component of a gas mixture) of oxygen in a fluid (i.e., liquid or gas). Low tension is when the partial pressure of oxygen (pO2) is low and high tension is when the pO2 is high.
“Defined-medium conditions” refer to environments for culturing cells where the concentration of components therein required for optimal growth are detailed. For example, depending on the use of the cells (e.g., therapeutic applications), removing cells from conditions that contain xenogenic proteins is important; i.e., the culture conditions are animal-free conditions or free of non-human animal proteins. In a related aspect, “in vitro fertilization (IVF) media” refers to a nutrient system which contains chemically defined substances on or in which fertilized oocytes can be grown.
“Extracellular matrix (ECM) substrates” refer to a surface beneath cells which supports optimum growth. For example, such ECM substrates include, but are not limited to, Matrigel, laminin, gelatin, and fibronectin substrates. In a related aspect, such substrates may comprise collagen IV, entactin, heparin sulfate proteoglycan, to include various growth factors (e.g., bFGF, epidermal growth factor, insulin-like growth factor-1, platelet derived growth factor, nerve growth factor, and TGF-β-1).
“Embryo” refers to an embryo that results upon activation of a cell, e.g., oocyte or other embryonic cells containing DNA of all male or female origin, which optionally may be modified, that comprises a discernible trophectoderm and inner cell mass, which cannot give rise to a viable offspring and where the DNA is of all male or female origin. The inner cell mass or cells contained therein are useful for the production of pluripotent cells as defined previously.
“Inner cell mass (ICM)” refers to the inner portion of an embryo which gives rise to fetal tissues. Herein, these cells are used to provide a continuous source of pluripotent cells in vitro. Further, the ICM includes the inner portion of the embryo that results from androgenesis or gynogenesis, i.e., embryos that result upon activation of cells containing DNA of all male or female origin. Such DNA, for example, will be human DNA, e.g., human oocyte or spermatozoal DNA, which may or may not have been genetically modified.
“Trophectoderm” refers to another portion of early stage embryo which gives rise to placental tissues, including that tissue of an embryo that results from androgenesis or gynogenesis, i.e., embryos that result from activation of cells that contain DNA of all male or female origin, e.g., human ovarian or spermatozoan.
“Differentiated cell” refers to a non-embryonic cell that possesses a particular differentiated, i.e., non-embryonic, state. The three earliest differentiated cell types are endoderm, mesoderm, and ectoderm.
“Substantially identical” refers to a quality of sameness regarding a particular characteristic that is so close as to be essentially the same within the ability to measure difference (e.g., by HLA typing, SNP analysis, and the like).
“Histocompatible” refers to the extent to which an organism will tolerate a graft of a foreign tissue.
“Genomic imprinting” refers to the mechanism by which a number of genes throughout the genome are monoallelically expressed according to their parental origin.
“Homoplasmy,” including grammatical variations thereof, refers to the presence of the same type of the mitochondrial DNA (mtDNA) within a cell or individual.
“Heteroplasmy,” including grammatical variations thereof, refers to the presence of a mixture of more than one type of mitochondrial DNA (mtDNA) within a cell or individual.
“Uniparental” refers to one or more cells or individuals from which another arises and to which it remains subsidiary.
“Mechanically isolating” refers to the process of separating cell aggregates by physical forces. For example, such a process would exclude the use of enzymes (or other cell cleavage products) which might contain non-human materials.
In the native environment, immature oocytes (eggs) from the ovary undergo a process of maturation which results in the progression through meiosis to metaphase II of meiosis. The oocytes then arrest at metaphase II. In metaphase II, the DNA content of the cell consists of a haploid number of chromosomes, each represented by two chromatids.
Such oocytes may be maintained indefinitely by cryopreserving by, for example, but not limited to, microinjection with a sugar.
In one embodiment, a method for producing human stem cells from a cryopreserved oocyte or parthenote is provided, including microinjecting into the cytoplasm of the oocyte or parthenote a cryopreservation agent, freezing the oocyte or parthenote to a cryogenic temperature to cause it to enter a dormant state, storing the oocyte or parthenote in the dormant state, thawing the oocyte or parthenote, parthenogenically activating the oocyte under high O2 tension in the presence or an ionophore followed by contacting the oocyte with a serine-threonine kinase inhibitor under low O2 tension, culturing the activated oocyte or parthenote until blastocyst formation, isolating an inner cell mass (ICM) from the blastocyst, and culturing the cells of the ICM on a layer of human feeder cells, where culturing the ICM cells is carried out under high O2 tension.
In one aspect, oocytes obtained as described are transferred to modified, isotonic IVF covered with embryo-tested mineral oil (Sigma), or any other suitable medium. If desired, the oocytes may be incubated with an extracellular sugar at the same concentration as the amount planned for microinjection. For example, to inject 0.1 M sugar, oocytes may be equilibrated in DMEM/F-12 with 0.1 M sugar. In one aspect, the cryopreservation agent comprises a lower Na+ concentration than standard DMEM (i.e., Na+ low media). In a related aspect, the cryopreservation agent comprises a higher K+ concentration than standard DMEM (i.e., K+ high). In a further related aspect, the cryopreservation agent comprises both a lower Na+ and higher K+ concentration than standard DMEM (i.e., Na+ low/K+ high media). In one aspect, the cryopreservation agent comprises an organic buffer, including but not limited to, HEPES. In another aspect, the cryopreservation agent comprises moieties that inhibit apoptotic protein (e.g., capases).
Alternatively, the oocytes may be optionally equilibrated with any other substantially non-permeable solute, such a NaCl, to decrease their cell volume prior to microinjection. This initial decrease in cell volume may result in a smaller final volume of the microinjected oocytes compared to oocytes not incubated in a hypertonic media prior to microinjection. This smaller final volume may minimize any potential adverse effect from the swelling of the oocytes. This general procedure for the preparation of cells for microinjection may also be used for other cell types (e.g., activated oocytes, hES cells, and the like).
The oocytes are then microinjected with a cryopreservation agent. Microinjection equipment and procedures are well characterized in the art and microinjection equipment known for use in injecting small molecules into cells may be used with the invention. In an exemplary microinjection step, oocytes can be microinjected at a pressure of 10 psi for 30 milliseconds. Another example of a standard microinjection technique is the method described by Nakayama and Yanagimachi (Nature Biotech. 16:639-642, 1998).
A cryopreservation agent useful in this process includes any chemical that has cryo-protective properties and is ordinarily non-permeable. In particular, the cryopreservation agent can include sugars either alone or mixed together with other traditional cryopreservation agents. Carbohydrate sugars such as trehalose, sucrose, fructose, and raffinose, may be microinjected to concentrations less than or equal to about 1.0 M, and more preferably, less than or equal to about 0.4 M. In one aspect, the concentration is between 0.05 and 0.20 M, inclusive. Additionally, an extracellular sugar or traditional cryopreservation agent may be added prior to storage. If the cells were incubated in a hypertonic solution prior to microinjection, the substantially non-permeable solute may be allowed to remain in the media after microinjection or may be removed from the media by washing the cells with media containing a lower concentration, or none, of this solute.
Certain sugars or polysaccharides which ordinarily do not permeate cell membranes because they are too large to pass through the membrane have superior physiochemical and biological properties for cryopreservation purposes. While these sugars ordinarily do not permeate cell membranes on their own, using the method as described, these ordinarily non-permeating sugars may be microinjected intracellularly to result in a beneficial effect.
Non-permeating sugars having a stabilizing or preserving effect on cells that are especially useful as the cryopreservation agent in the present method include sucrose, trehalose, fructose, dextran, and raffinose. Among these sugars, trehalose, a non-reducing disaccharide of glucose, has been shown to be exceptionally effective in stabilizing cell structures at low concentrations. The addition of extracellular glycolipids or glycoproteins may also stabilize the cell membrane.
Following the microinjection of the cryopreservation agent, the cells are prepared for storage. A variety of methods for freezing and/or drying may be employed to prepare the cells for storage. In particular, three approaches are described herein: vacuum or air drying, freeze drying, and freeze-thaw protocols. Drying processes have the advantage that the stabilized biological material may be transported and stored at ambient temperatures.
Typically, oocytes loaded with 1 to 2M DMSO are cooled at a very slow cooling rate (0.3 to 0.5° C./min) to an intermediate temperature (−60° C. to −80° C.) before plunging in liquid nitrogen for storage. The sample can then be stored at this temperature.
The suspended material can then be stored at cryopreservation temperatures, for example, by leaving the vials in liquid nitrogen (LN2), for the desired amount of time.
Protocols for vacuum or air drying and for freeze drying proteins are well characterized in the art (Franks et al., “Materials Science and the Production of Shelf-Stable Biologicals,” BioPharm, October 1991, p. 39; Shalaev et al., “Changes in the Physical State of Model Mixtures during Freezing and Drying: Impact on Product Quality,” Cryobiol. 33, 14-26 (1996)) and such protocols may be used to prepare cell suspensions for storage with the method as described. In addition to air drying, other convective drying methods that may be used to remove water from cell suspensions include the convective flow of nitrogen or other gases.
An exemplary evaporative vacuum drying protocol useful with the method of the invention may include placing 20 μl each into wells on 12 well plates and vacuum drying for 2 hours at ambient temperature. Of course, other drying methods could be used, including drying the cells in vials. Cells prepared in this manner may be stored dry, and rehydrated by diluting in DMEM or any other suitable media.
A method of the invention using freeze drying to prepare the cells for storage begins with freezing the cell suspension. While methods of freezing known in the art may be employed, the simple plunge freezing method described herein for the freeze-thaw method may also be used for the freezing step in the freeze drying protocol.
After freezing, a two stage drying process may be employed. In the first stage, energy of sublimation is added to vaporize frozen water. Secondary drying is performed after the pure crystalline ice in the sample has been sublimated. Freeze dried cells can be stored and hydrated in the same manner as described above for vacuum drying. Viable cells may then be recovered.
After the recovery of cells from a frozen or dried state, any external cryopreservation agent may be optionally removed from the culture media. For example, the media may be diluted by the addition of the corresponding media with a lower concentration of cryopreservation agent. For example, the recovered cells may be incubated for approximately five minutes in media containing a lower concentration of sugar than that used for cell storage. For this incubation, the media may contain the same sugar that was used as the cryopreservation agent; a different cryopreservation agent, such as galactose; or any other substantially non-permeable solute. To minimize any osmotic shock induced by the decrease in the osmolarity of the media, the concentration of the extracellular cryopreservation agent may be slowly decreased by performing this dilution step multiple times, each time with a lower concentration of cryopreservation agent. These dilution steps may be repeated until there is no extracellular cryopreservation agent present or until the concentration of cryopreservation agent or the osmolarity of the media is reduced to a desired level.
The parthenogenetically activated oocytes, blastocysts, ICM, and autologous stem cells can be stored or “banked” in a manner that allows the cells to be revived as needed in the future. An aliquot of the parthenogenetically activated oocytes and autologous stem cells can be removed at any time, to be grown into cultures of many undifferentiated cells and then differentiated into a particular cell type or tissue type, and may then be used to treat a disease or to replace malfunctioning tissues in a subject. Since the cells are parthenogenetically derived from the donor, the cells can be stored so that an individual or close relative can have access to cells for an extended period of time.
In one embodiment, a cell bank is provided for storing parthenogenetically activated oocytes, blastocysts, ICM, and/or autologous stem cell samples. In another embodiment, methods for administering such a cell bank are provided. U.S. Published Patent Application No. 20030215942, which is incorporated by reference herein in its entirety, provides an example of a stem cell bank system.
Using methods such as those described above, the isolation and in vitro propagation of parthenogenetically activated oocytes, blastocysts, ICM, and autologous stem cell samples and their cryopreservation facilitates the establishment of a “bank” of transplantable human stem cells. Because it is possible to store smaller aliquots of cells, the banking procedure could take up a relatively small space. Therefore, the cells of many individuals could be stored or “banked” on a short term or long term basis, with relatively little expense.
In one embodiment, a portion of the sample is made available for testing, either before or after processing and storage.
This invention also provides methods of recording or indexing the parthenogenetically activated oocyte, blastocyst, ICM, and/or autologous stem cell samples so that when a sample needs to be located, it can be easily retrieved. Any indexing and retrieval system can be used to fulfill this purpose. Any suitable type of storage system can be used so that the parthenogenetically activated oocytes, blastocysts, ICM, and/or autologous stem cells can be stored. The samples can be designed to store individual samples, or can be designed to store hundreds, thousands, and even millions of different cell samples.
The stored parthenogenetically activated oocyte, blastocyst, ICM, and/or autologous stem cell samples can be indexed for reliable and accurate retrieval. For example, each sample can be marked with alphanumeric codes, bar codes, or any other method or combinations thereof. There may also be an accessible and readable listing of information enabling identification of each parthenogenetically activated oocyte, blastocyst, ICM, and/or autologous stem cell sample and its location in the bank and enabling identification of the source and/or type the cell sample, which is outside of the bank. This indexing system can be managed in any way known in the art, e.g., manually or non-manually, e.g. a computer and conventional software can be used.
In one embodiment, the cell samples are organized using an indexing system so that the sample will be available for the donor's use whenever needed. In other embodiments, the cell samples can be utilized by individuals related to the original donor. Once recorded into the indexing system, the cell sample can be made available for matching purposes, e.g., a matching program will identify an individual with matching type information and the individual will have the option of being provided the matching sample.
The storage banking system can comprise a system for storing a plurality of records associated with a plurality of individuals and a plurality of cell samples. Each record may contain type information, genotypic information or phenotypic information associated with the cell samples or specific individuals. In one embodiment, the system will include a cross-match table that matches types of the samples with types of individuals who wish to receive a sample.
In one embodiment, the database system stores information for each parthenogenetically activated oocyte, blastocyst, ICM, and/or autologous stem cell sample in the bank. Certain information is stored in association with each sample. The information may be associated with a particular donor, for example, an identification of the donor and the donor's medical history. For example, each sample may be HLA typed and the HLA type information may be stored in association with each sample. The information stored may also be availability information. The information stored with each sample is searchable and identifies the sample in such a way that it can be located and supplied to the client immediately.
Accordingly, embodiments of the invention utilize computer-based systems that contain information such as the donor, date of submission, type of cells submitted, types of cell surface markers present, genetic information relating to the donor, or other pertinent information, and storage details such as maintenance records and the location of the stored samples, and other useful information.
The term “a computer-based system” refers to the hardware, software, and any database used to store, search, and retrieve information about the stored cells. The computer-based system preferably includes the storage media described above, and a processor for accessing and manipulating the data. The hardware of the computer-based systems of this embodiment comprises a central processing unit (CPU) and a database. A skilled artisan can readily appreciate that any one of the currently available computer-based systems are suitable.
In one embodiment, the computer system includes a processor connected to a bus that is connected to a main memory (preferably implemented as RAM) and a variety of secondary storage devices, such as a hard drive and removable medium storage device. The removable medium storage device can represent, for example, a floppy disk drive, a DVD drive, an optical disk drive, a compact disk drive, a magnetic tape drive, etc. A removable storage medium, such as a floppy disk, a compact disk, a magnetic tape, etc. containing control logic and/or data recorded therein can be inserted into the removable storage device. The computer system includes appropriate software for reading the control logic and/or the data from the removable medium storage device once inserted in the removable medium storage device. Information relating to the parthenogenetically activated oocyte, blastocyst, ICM, and/or autologous stem cell can be stored in a well known manner in the main memory, any of the secondary storage devices, and/or a removable storage medium. Software for accessing and processing these data (such as search tools, compare tools, etc.) reside in main memory during execution.
As used herein, “a database” refers to memory that can store any useful information relating to the parthenogenetically activated oocyte and/or autologous stem cell collections and the donors.
The data relating to the stored parthenogenetically activated oocyte, blastocyst, ICM, and/or autologous stem cell can be stored and manipulated in a variety of data processor programs in a variety of formats. For example, the data can be stored as text in a word processing file, such as Microsoft WORD or WORDPERFECT, an ASCII file, an html file, or a pdf file in a variety of database programs familiar to those of skill in the art, such as DB2, SYBASE, or ORACLE.
A “search program” refers to one or more programs that are implemented on the computer-based system to search for details or compare information relating to the cryopreserved samples within a database. A “retrieval program” refers to one or more programs that can be implemented on the computer-based system to identify parameters of interest in the database. For example, a retrieval program can be used to find samples that fit a particular profile, samples having specific markers or DNA sequences, or to find the location of samples corresponding to particular individuals.
There is no upper limit on the number of cell samples that can be stored in one cell bank. In one embodiment, hundreds of products from different individuals will be stored at one bank or storage facility. In another embodiment, up to millions of products may be stored in one storage facility. A single storage facility may be used to store parthenogenetically activated oocyte and/or autologous stem cell samples, or multiple storage facilities may be used.
In some embodiments of the present invention, the storage facility may have a means for any method of organizing and indexing the stored cell samples, such as, for example, automated robotic retrieval mechanisms and cell sample manipulation mechanisms. The facility may include micromanipulation devices for processing cell samples. Known conventional technologies can be used for efficient storage and retrieval of the cell samples. Exemplary technologies include but are not limited to Machine Vision, Robotics, Automated Guided Vehicle System, Automated Storage and Retrieval Systems, Computer Integrated Manufacturing, Computer Aided Process Planning, Statistical Process Control, and the like.
The type information or other information associated with the individual in need of a sample may be recorded into a system that can be used to identify an appropriate matching product, such as, for example, a database system, an indexing system, and the like. Once recorded in the system, a match can be made between the type of the individual and a donor cell sample. In preferred embodiments, the donor sample is from the same individual as the individual in need of the sample. However, similar but not identical donor/recipient matches can also be used. The matching sample is available for the individual possessing the matching type identifier. In one embodiment of this invention, the individual's identification information is stored in connection with the cell sample. In some embodiments, the matching process occurs around the time of harvesting the sample, or can occur at any time during processing, storage, or when a need arises. Accordingly, in some embodiments of the invention, the matching process occurs before the individual is in actual need of the cell sample.
When the parthenogenetically activated oocyte, blastocyst, ICM, and/or autologous stem cell sample is needed by an individual, it may be retrieved and made available for research, transplantation or other purposes within minutes, if desired. The sample may also be further processed to prepare it for transplantation or other needs.
Normally, the oocyte is ovulated at this stage and fertilized by the sperm. The sperm initiates the completion of meiosis in a process called activation. During activation, the pairs of chromatids separate, the second polar body is extruded, and the oocyte retains a haploid number of chromosomes, each with one chromatid. The sperm contributes the other haploid complement of chromosomes to make a full diploid cell with single chromatids. The chromosomes then progress through DNA synthesis during the first cell cycle. These cells then develop into embryos.
By contrast, embryos described herein are developed by artificial activation of cells, typically mammalian oocytes or blastomeres containing DNA of all male or female origin. As discussed in the background of the invention, many methods have been reported in the literature for artificial activation of unfertilized oocytes. Such methods include physical methods, e.g., mechanical methods such as pricking, manipulation or oocytes in culture, thermal methods such as cooling and heating, repeated electric pulses, enzymatic treatments, such as trypsin, pronase, hyaluronidase, osmotic treatments, ionic treatments such as with divalent cations and calcium ionophores, such as ionomycin and A23187, the use of anesthetics such as ether, ethanol, tetracaine, lignocaine, procaine, phenothiazine, tranquilizers such as thioridazine, trifluoperazine, fluphenazine, chlorpromazine, the use of protein synthesis inhibitors such as cycloheximide, puromycin, the use of phosphorylation inhibitors, e.g., protein kinase inhibitors such as staurosporine, 2-aminopurine, sphingosine, and DMAP, combinations thereof, as well as other methods.
Such activation methods are well known in the art and are discussed U.S. Pat. No. 5,945,577, incorporated herein by reference.
In one embodiment, a human cell in metaphase II, typically an oocyte or blastomere comprising DNA of all male or female origin, is artificially activated for effecting artificial activation of oocytes.
In a related aspect, the activated cell, e.g., oocyte, which is diploid, is allowed to develop into an embryo that comprises a trophectoderm and an inner cell mass. This can be effected using known methods and culture media that facilitate blastocyst development.
After the gynogenetic embryos have been cultured to produce a discernable trophectoderm and inner cell mass, the cells of the inner cell mass are then used to produce the desired pluripotent cell lines. This can be accomplished by transferring cells derived from the inner cell mass or the entire inner cell mass onto a culture that inhibits differentiation. This can be effected by transferring the inner cell mass cells onto a feeder layer that inhibits differentiation, e.g., fibroblasts or epithelial cells, such as fibroblasts derived from postnatal human tissues, etc., or other cells that produce LIF. Other factors/components may be employed to provide appropriate culture conditions for maintaining cells in the undifferentiated state including, but not limited to, addition of conditioned media (Amit et al., Developmental Biol (2000) 227:271-278), bFGF and TGF-β1 (with or without LIF) (Amit et al., Biol Reprod (2004) 70:837-845), factors which activate the gp130/STAT3 pathway (Hoffman and Carpenter, Nature Biotech (2005) 23(6):699-708), factors which activate the PI3K/Akt, PKB pathway (Kim et al., FEBS Lett (2005) 579:534-540), factors that are members of the bone morphogenetic protein (BMP) super family (Hoffman and Carpenter (2005), supra), and factors which activate the canonical/β-catenin Wnt signaling pathway (e.g., GSK-3-specific inhibitor; Sato et al., Nat Med (2004) 10:55-63). In a related aspect, such factors may comprise culture conditions that include feeder cells and/or ECM substrates (Hoffman and Carpenter (2005), supra).
In one aspect, the inner cell mass cells are cultured on human postnatal foreskin or dermal fibroblast cells or other cells which produce leukemia inhibitory factor, or in the presence of leukemia inhibitory factor. In a related aspect, feeder cells are inactivated prior to seeding with the ICM. For example, the feeder cells can be mitotically inactivated using an antibiotic. In a related aspect, the antibiotic can be, but is not limited to, mitomycin C.
Culturing will be effected under conditions that maintain the cells in an undifferentiated, pluripotent state, for prolonged periods, theoretically indefinitely. In one embodiment, oocytes are parthenogenically activated with calcium ionophores under high O2 tension followed by contacting the oocytes with a serine-threonine kinase inhibitor under low O2 tension. The resulting ICM from the parthenogenically activated oocytes is cultured under high O2 tension, where the cells, for example, are maintained using a gas mixture comprising 20% O2. In one aspect, culturable refers to being capable of, or fit for, being cultivated. In a related aspect, ICM isolation is carried out mechanically after four days of blastocyst cultivation, where the cultivation is carried out on feeder cells. Such cultivation, for example, eliminates the need to use materials derived from animal sources, as would be the case for immunosurgery.
In a related aspect, culture media for the ICM is supplemented with non-animal sera, including but not limited to, human umbilical cord serum, where the serum is present in defined media (e.g., IVF, available from MediCult A/S, Denmark; Vitrolife, Sweden; or Zander IVF, Inc., Vero Beach, Fla.). In another aspect, the media and processes as provided are free of animal products. In a related aspect, animal products are those products, including serum, interferons, chemokines, cytokines, hormones, and growth factors, that are from non-human sources.
The pluripotent state of the cells produced by the present invention can be confirmed by various methods. For example, the cells can be tested for the presence or absence of characteristic ES cell markers. In the case of human ES cells, examples of such markers are identified supra, and include SSEA-4, SSEA-3, TRA-1-60, TRA-1-81 and OCT 4, and are known in the art.
Also, pluripotency can be confirmed by injecting the cells into a suitable animal, e.g., a SCID mouse, and observing the production of differentiated cells and tissues. Still another method of confirming pluripotency is using the subject pluripotent cells to generate chimeric animals and observing the contribution of the introduced cells to different cell types. Methods for producing chimeric animals are well known in the art and are described in U.S. Pat. No. 6,642,433, incorporated by reference herein.
Yet another method of confirming pluripotency is to observe ES cell differentiation into embryoid bodies and other differentiated cell types when cultured under conditions that favor differentiation (e.g., removal of fibroblast feeder layers). This method has been utilized and it has been confirmed that the subject pluripotent cells give rise to embryoid bodies and different differentiated cell types in tissue culture.
The resultant pluripotent cells and cell lines, preferably human pluripotent cells and cell lines, which are derived from DNA of entirely female original, have numerous therapeutic and diagnostic applications. Such pluripotent cells may be used for cell transplantation therapies or gene therapy (if genetically modified) in the treatment of numerous disease conditions.
In this regard, it is known that mouse embryonic stem (ES) cells are capable of differentiating into almost any cell type. Therefore, human pluripotent (ES) cells produced according to the invention should possess similar differentiation capacity. The pluripotent cells according to the invention will be induced to differentiate to obtain the desired cell types according to known methods. For example, human ES cells produced according to the invention may be induced to differentiate into hematopoietic stem cells, muscle cells, cardiac muscle cells, liver cells, islet cells, retinal cells, cartilage cells, epithelial cells, urinary tract cells, etc., by culturing such cells in differentiation medium and under conditions which provide for cell differentiation. Medium and methods which result in the differentiation of ES cells are known in the art as are suitable culturing conditions.
For example, Palacios et al, Proc. Natl. Acad. Sci., USA, 92:7530-7537 (1995) teach the production of hematopoietic stem cells from an embryonic cell line by subjecting stem cells to an induction procedure comprising initially culturing aggregates of such cells in a suspension culture medium lacking retinoic acid followed by culturing in the same medium containing retinoic acid, followed by transferal of cell aggregates to a substrate which provides for cell attachment.
Moreover, Pedersen, J. Reprod. Fertil. Dev., 6:543-552 (1994) is a review article which references numerous articles disclosing methods for in vitro differentiation of embryonic stem cells to produce various differentiated cell types including hematopoietic cells, muscle, cardiac muscle, nerve cells, among others.
Further, Bain et al, Dev. Biol., 168:342-357 (1995) teach in vitro differentiation of embryonic stem cells to produce neural cells which possess neuronal properties. These references are exemplary of reported methods for obtaining differentiated cells from embryonic or stem cells. These references and in particular the disclosures therein relating to methods for differentiating embryonic stem cells are incorporated by reference in their entirety herein. Thus, using known methods and culture medium, one skilled in the art may culture the subject ES cells, including genetically engineered or transgenic ES cells, to obtain desired differentiated cell types, e.g., neural cells, muscle cells, hematopoietic cells, etc. Pluripotent cells produced by the methods described herein may be used to obtain any desired differentiated cell type. Therapeutic usages of differentiated human cells are unparalleled. For example, human hematopoietic stem cells may be used in medical treatments requiring bone marrow transplantation. Such procedures are used to treat many diseases, e.g., late stage cancers such as ovarian cancer and leukemia, as well as diseases that compromise the immune system, such as AIDS. Hematopoietic stem cells can be obtained, e.g., by incorporating male or female DNA derived from a male or female cancer or AIDS patient with an enucleated oocyte, obtaining pluripotent cells as described above, and culturing such cells under conditions which favor differentiation, until hematopoietic stem cells are obtained. Such hematopoietic cells may be used in the treatment of diseases including cancer and AIDS.
Alternatively, the subject pluripotent cells may be used to treat a patient with a neurological disorder by culturing such cells under differentiation conditions that produce neural cell lines. Specific diseases treatable by transplantation of such human neural cells include, by way of example, Parkinson's disease, Alzheimer's disease, ALS and cerebral palsy, among others. In the specific case of Parkinson's disease, it has been demonstrated that transplanted fetal brain neural cells make the proper connections with surrounding cells and produce dopamine. This can result in long-term reversal of Parkinson's disease symptoms. In a related aspect, nerve precursors can be used to reanneal severed/damaged nerve fibers to restore movement after hand, leg, and spinal cord injuries.
One object of the subject invention is that it provides an essentially limitless supply of pluripotent, human cells that can be used to produce differentiated cells suitable for autologous transplantation for the oocyte donor. Human embryonic stem cells and their differentiated progeny derived from blastocysts remaining after infertility treatments, or created using NT, will likely be rejected by a recipient's immune system when used in allogenic cell transplantation therapy. Parthenogenically derived stem cells should result in differentiated cells that could alleviate the significant problem associated with current transplantation methods, i.e., rejection of the transplanted tissue which may occur because of host-vs-graft or graft-vs-host rejection relative to the oocyte donor. Conventionally, rejection is prevented or reduced by the administration of anti-rejection drugs such as cyclosporin. However, such drugs have significant adverse side-effects, e.g., immunosuppression, carcinogenic properties, as well as being very expensive. Cells produced by the methods as disclosed should eliminate, or at least greatly reduce, the need for anti-rejection drugs relative to the oocyte donor.
Another object of the subject invention is that it provides an essentially limitless supply of pluripotent, human cells that can be used to produce differentiated cells suitable for allogenic transplantation to members of the oocyte donor's family (e.g., siblings). The cells will be immunologically and genetically similar to those of the oocytes donor's direct family members and thus less likely to be rejected by the donor's family members.
Another object of this method is that parthenogenic activation of mammalian oocytes is a relatively simple procedure when compared to SCNT and results in the creation of stem cells with less cell manipulation.
Parthenogenic activation of mammalian oocytes has shown to be more efficient in the creation of stem cells than methods requiring mechanical manipulation of the oocyte (e.g., SCNT).
One drawback of SCNT is that subjects with deficient mitochondrial respiratory chain activity present phenotypes with striking similarities to abnormalities commonly encountered in SCNT fetuses and offspring (Hiendleder et al, Repro Fertil Dev (2005) 17(1-2):69-83). Cells normally contain only one type of mitochondrial DNA (mtDNA), termed homoplasmy, however, heteroplasmy does exist, usually as a combination of mutant and wild-type mt DNA molecules or form a combination of wild-type variants (Spikings et al., Hum Repro Update (2006) 12(4):401-415). As heteroplasmy can result in mitochondrial disease, various mechanisms exist to ensure maternal-only transmission. However, with the increasing use of protocols which bypass normal mechanisms for homoplasmy maintenance (e.g., cytoplasmic transfer (CT) and SCNT), perturbed mitochondrial function may be intrinsic to stem cells derived from these sources.
In one aspect, as the parthenotes are uniparental, the possibility of heteroplasmy is minimized.
Other diseases and conditions treatable by cell therapy include, by way of example, spinal cord injuries, multiple sclerosis, muscular dystrophy, diabetes, liver diseases Including acute diseases (viral hepatitis, drug overdoses (acetaminophen) and others), chronic diseases (chronic hepatitis and others (generally leading to cirrhosis)), heritable liver defects (hemophilia B, factor IX deficiency, bulirubin metabolism defects, urea cycle defects, lysosomal storage disease, a1-antitrypsin deficiency and others), heart diseases, cartilage replacement, burns, foot ulcers, gastrointestinal diseases, vascular diseases, kidney disease, retinal disease, urinary tract disease, and aging related diseases and conditions.
This methodology can be used to replace defective genes, e.g., defective immune system genes, cystic fibrosis genes, or to introduce genes which result in the expression of therapeutically beneficial proteins such as growth factors, lymphokines, cytokines, enzymes, etc.
For example, the gene encoding brain derived growth factor may be introduced into human pluripotent cells produced according to the invention, the cells differentiated into neural cells and the cells transplanted into a Parkinson's patient to retard the loss of neural cells during such disease.
Also, the subject pluripotent human ES cells, may be used as an in vitro model of differentiation, in particular for the study of genes which are involved in the regulation of early development. Also, differentiated cell tissues and organs produced using the subject ES cells may be used in drug studies.
Further, the subject ES cells or differentiated cells derived therefrom may be used as nuclear donors for the production of other ES cells and cell colonies.
Still further, pluripotent cells obtained according to the present disclosure may be used to identify proteins and genes that are involved in embryogenesis. This can be effected, e.g., by differential expression, i.e., by comparing mRNAs that are expressed in pluripotent cells provided according to the invention to mRNAs that are expressed as these cells differentiate into different cell types, e.g., neural cells, myocardiocytes, other muscle cells, skin cells, etc. Thereby, it may be possible to determine what genes are involved in differentiation of specific cell types.
Further, ES cells and/or their differentiated progeny that have specific genetic defects, such as the genetic defect that leads to Duchene's Muscular Dystrophy, may be used as models to study the specific disease associated with the genetic defect.
Also, it is another object of the present disclosure to expose pluripotent cell lines produced according to the described methods to cocktails of different growth factors, at different concentrations and under different cell culture conditions such as cultured on different cell matrices or under different partial pressures of gases so as to identify conditions that induce the production and proliferation of desired differentiated cell types.
The following examples are intended to illustrate but not limit the invention.
EXAMPLE 1
Production of Human Parthenogenic Embryogenic Stem Cells
Materials and Methods
Donors voluntarily donated oocytes, cumulous cells, and blood (for DNA analysis) with no financial payment. Donors signed comprehensive informed consent documents and were informed that all donated materials were to be used for research and not for reproductive purposes. Before ovarian stimulation, oocyte donors underwent medical examination for suitability according to FDA eligibility determination guidelines for donors of human cells, tissues, and cellular and tissue-based products (Food and Drug Administration. (Draft) Guidance for Industry: Eligibility Determination for Donors of Human Cells, Tissues, and Cellular and Tissue Based Products (HCT/Ps) dated May 2004) and order N 67 (02.26.03) of Russian Public Health Ministry. It included X-ray, blood and urine analysis, and liver function test. Donors were also screened for syphilis, HIV, HBV, and HCV.
Oocytes were obtained using standard hormonal stimulation to produce superovulation in the subject donor. Each donor egg underwent ovarian stimulation by FSH from the 3rd to the 13th days of their menstrual cycle. A total of 1500IU of FSh was given. From the 10th to the 14th day of the donor's menstrual cycle, gonadoliberin antagonist Orgalutran (Organon, Holland) was injected at 0.25 mg/day. From the 12th to the 14th day of the donor's menstrual cycle a daily injection of 75IU FSH+75IU LH (Menopur, Ferring GmbH, Germany(was given, If an ultrasound examination displayed follicles between 18 and 20 mm in diameter, a single 8000IU dose of hGC (Choragon, Ferring GmbH, Germany) was administered on the 14th day of the donor's menstrual cycle. Trans-vaginal punction was performed 35 hours after hCG injection on approximately the 16th day. Follicular fluid was collected from the antral follicles of anesthetized donors by ultrasound-guided needle aspiration into sterile tubes.
Cumulus oocyte complexes (COCs) were picked from the follicular fluid, washed in Flushing Medium (MediCult) and then incubated in Universal IVF medium (MediCult, see Table 1) with a Liquid Paraffin (MediCult) overlay for 2 hours in a 20% O2, 5% CO2, at 37° C. humidified atmosphere.
TABLE 1
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IVF media.
COMPOSITION
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Calcium Chloride
EDTA
Glucose
Human Serum Albumin
Magnesium Sulfate
Penicillin G
Potassium Chloride
Potassium di-Hydrogen Phosphate
Sodium Bicarbonate
Sodium Chloride
Sodium Lactate
Sodium Pyruvate
Water
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Before activation, cumulus-oocyte complexes (COCs) were treated with SynVitro Hyadase (MediCult, A/S, Denmark) to remove cumulus cells followed by incubation in Universal IVF medium with a paraffin overlay for 30 minutes.
From this point onward, the culture of oocytes and embryos was performed in a humidified atmosphere at 37° C. using O2-reduced gas mixture (90% N2+5% O2+5% CO2), with the exception of the ionomycin treatment. The oocytes were activated by incubation in 5 μM ionomycin for 5 minutes in a CO2 incubator at 37° C. in a gas environment of 20% O2, 5% CO2, followed by culture with 1 mM 6-dimethylaminopurine (DMAP) for 4 hours in IVF medium, with paraffin overlay, in a gas environment of 90% N2, 5% O2, and 5% CO2 at 37° C. The oocytes were then washed 3 times in IVF. Activation and cultivation were carried out in 4-well plates (Nunclon, A/S, Denmark) in 500 μl of medium overlaid with liquid paraffin oil (MediCult, A/S, Denmark).
Activated oocytes were cultivated in IVF medium in a gas environment comprising 5% O2, 5% CO2, and 90% N2, and embryos generated from the activated oocytes were cultured in the same gas mixture.
Activated oocytes were allowed to incubate in IVF under the above conditions (i.e., low O2 tension) until fully expanded blastocysts containing an inner cell mass (ICM) at a Blastocyst Scoring Modification of 1AA or 2AA (Shady Grove Fertility Center, Rockville, Md., and Georgia Reproductive Specialists, Atlanta, Ga.) was observed.
The zona pellucida was removed by 0.5% pronase (Sigma, St. Louis) treatment. The ICM from blastocysts was isolated by immuno-surgery where the blastocysts were incubated with horse antiserum to human spleen cells followed by exposure to guinea pig complement. Trophoectodern cells were removed from the ICM by gently pipetting the treated blastocysts.
For the derivation of ICM from whole blastocysts, the blastocysts were placed on a feeder layer in medium designed for culture of phESC (i.e., VitroHES™ media (e.g., DMEM/high glucose medium, VitroLife, Sweden) supplemented with 10% human umbilical cord blood serum, 5 ng/ml human recombinant LIF (Chemicon Int'l, Inc., Temecula, Calif.), 4 ng/ml recombinant human FGF (Chemicon Int'l, Inc., Temecula, Calif.) and penicillin-streptomycin (100 U/100 μg)). When blastocysts attached and trophoplast cells spread, the ICM became visible. Through three to four days of additional culture, the ICM was isolated through mechanical slicing of the ICM from the trophoectoderm outgrowth using a finely drawn glass pipette. Further, the IMC cells were cultured on a feeder cell layer of mitotically inactivated post natal human dermal fibroblasts, in VirtroHES™ media (as formulated above) in a 96-well plate in 5% CO2 and 20% O2 at 37° C. This gas mixture was used to culture stem cells. Human fibroblast cultures were made using non-animal materials. Inactivation of fibroblasts was carried out using 10 μg/ml mitomycin C (Sigma, St. Louis, Mo.) for 3 hours.
In a separate method, immuno-surgery was performed by incubating blastocysts with horse antiserum to human spleen cells followed by exposure to rabbit complement. The trophectoderm cells were removed from the ICM through gentle pipetting of the treated blastocyts. Further culturing of the isolated ICMs was performed on a feeder layer of neonatal human skin fibroblasts (HSF) obtained from a genetically unrelated individual (with parental consent) derived using medium containing human umbilical cord blood serum. The HSF feeder layer was mitotically inactivated using mitomycin C.
The medium for the culture of HSF consisted of 90% DMEM (high glucose, with L-glutamaine (Invitrogen), 10% human umbilical cord blood serum and penicillin-streptomycin (100 U/100 mg) Invitrogen).
For the culture of ICM and phESC, VitroHES™ (Vitrolife) supplemented with 4 ng/ml hrbFGF, 5 ng/ml hrLIF and 10% human umbilical cord blood serum was used. The ICM was mechanically plated on a fresh feeder layer and cultured for three to four days. The first colony was mechanically cut and replated after five days of culture. All subsequent passages were made after five to six days in culture. For early passages, colonies were mechanically divided into clumps and replated. Further passing of phESC was performed with collagenase IV treatment and mechanical dissociation. The propagation of phESC was performed at 37° C., 5% CO2 in a humidified atmosphere.
Oocyte Activation
From the initial donor, four oocytes were activated, and the activated oocytes were cultivated in IVF medium in a gas environment comprising 5% O2, 5% CO2, and 90% N2 and followed over five (5) days. Table 2 shows the progress of maturation of the activated oocytes. Each oocyte was separated in a 4-well plate.
TABLE 2
|
|
Cultured Activated Oocytes.*
Day 1Day 2Day 3Day 5
|
N11 pronucleus (pn),2 blastomers4 bl equal,1 morula,
1 polar body (pb)(bl) equal,fr-2%fr-15%
fragmentation
(fr)-0%
N20 pn,4 bl not equal,5 bl not equal,4 bl not equal,
1 pbfr-4%fr-20%fr-40%
N31 pn,2 bl not equal,6 bl equal,early
1 pbfr-0%fr-0%blastocysts
N41 pn,4 bl equal,4 bl equal,Fully expanded
1 pbfr-10%fr-20%blastocyst with
good ICM 1AA
|
*Cells were incubated in M1 ™ media (MediCult) on the first day and M2 ™ media (MediCult) on days 2-5. Media was changed everyday. M1 ™ and M2 ™ contain human serum albumin, glucose and derived metabolites, physiological salts, essential amino acids, non-essential amino acids, vitamins, nucleotides, sodium bicarbonate, streptomycin (40 mg/l), penicillin (40.000 IU/l) and phenol red.
|
Inner cell masses were isolated from N4 and transferred to human fibroblast feeder cells as outlined above. N1 and N2 degenerated on Day 6. Further, on Day 6, N3 produced fully expanded blastocyst with ICM 2AB. N3 was then transferred to human fibroblast feeder cells on Day 6. ICM from N4 was unchanged. N3 was used to isolate stem cells.
ICM cells were cultivated in VitroHES™ medium in a gas environment comprising 5% CO2, and 95% N2 and followed over forty-five (45) days. Table 2a shows the progress of N3 ICM cell cultivation.
TABLE 2a
|
|
Progress of N3-ICM Cultivation.*
|
|
Day 3ICM transplanted on fresh feeder cells.
Day 8Colony of cells divided mechanically into 6 pieces and
cultivated in 3 wells of a 96-well plate-1st passage.
Day 14From five (5) colonies of 1st passage, cells were
mechanically divided, and 20 colonies of a 2nd passage
were cultivated in 3 wells of a 24-well plate.
Day 20Cells were plated in 35 mm dish-3rd passage.
Day 24Five (5) 35 mm dishes were seeded with cells-4th passage.
One dish was divided chemically with 5% pronase (Sigma)
at room temperature.
Day 30Twenty-five (25) 35 mm were seeded with cells-5th**
passage.
Day 346th** cell passage.
Day 3511 ampules were frozen from the 6th passage.
Day 377th** cell passage.
Day 4412 ampules were frozen from the 7th passage.
Day 458th cell passage.
|
*Cells were grown on M2 ™ media (MediaCult).
|
**These passages were made with pronase digestion.
|
Stem Cell Isolation.
From the oocytes from 5 donors, the use of MediCult media followed by a culture under reduced oxygen allowed for the production of 23 blastocysts on the fifth or sixth day of culture. Eleven of the blastocysts had visible ICMs (Table 3).
TABLE 3
|
|
Generation of Parthenotes and Parthenogenetic Embryonic Stem Cell Lines.
Blastocysts derived
NormallyWithout
DonorOocytesOocytesactivatedParthenotesvisibleLines
NumberharvesteddonatedoocytescreatedWith ICMICMgenerated
|
184442—phESC-1
immunosurgery
21588833phESC-3
phESC-4
phESC-5
all from whole
blastocysts
32714 121 112 32phESC-6 from
whole
blastocysts
42211103 10 23phESC-7 from
whole
blastocysts
520 947714No cell line
generated
|
1two were not activated;
|
2one oocyte degenerated after activation;
|
3one oocyte was not activated;
|
4two oocytes were at metaphase stage I and were discarded.
|
These results indicate an approximate 57.5% success rate in the formation of blastocysts from parthenogenetically activated oocytes.
Immunohistochemical Staining
For immunostaining, hES cell colonies and phESC cells on feeder layers were seeded onto micro cover glass, washed twice with PBS and fixed with 100% methanol for 5 minutes at −20° C. Cells were washed twice with PBS+0.05% Tween-20 and permeabilized with PBS+0.1% Triton X-100 for 10 minutes at room temperature. After cell washing, non-specific binding was blocked by incubation with blocking solution (PBS+0.05% Tween-20+four percent goat serum plus three percent human umbilical cord blood serum) for 30 minutes at room temperature (RT). Monoclonal antibodies were diluted in blocking solution and used for one hour at RT: SSEA-1 (MAB4301) (1:30), SSEA-3 (MAB4303) (1:10), SSEA-4 (MAB4304) (1:50), OCT-4 (MAB4305) (1:30), TRA-1-60 (MAB4360) (1:50), and TRA-1-81 (MAB4381) (1:50) from Chemicon. After the cells were washed, secondary antibodies Alexa Fluor 546 (orange-fluorescent) and 488 (green-fluorescent) (Molecular Probes, Invitrogen) were diluted 1:1000 in PBS+0.05% Tween-20 and applied for one hour at RT. Cells were washed and nuclei were stained with DAPI (Sigma) 0.1 μg/ml in PBS+0.05% Tween-20 during ten minutes at RT. Cells were washed and mounted on slides with Mowiol (Calbiochem). Fluorescence images were visualized with a fluorescence microscope.
For the detection of mesodermal markers in three week old embryoid bodies or in contractile embryoid bodies, monoclonal mouse anti-desmina antibody anti-human alpha actinin antibody (Chemicon) as the muscle specific markers, and anti-human CD31/PECAM-1 antibody (R&D Systems), antihuman VE Cadherin (DC144) antibody (R&D Systems) as the endothelial markers were used.
For detection of the endodermal markers in embryoid bodies, monoclonal mouse anti-human alpha-fetoprotein antibody (R&D Systems) was used.
Alkaline Phosphatase and Telomerase Activity
Alkaline phosphatase and telomerase activity were performed according to the manufacturer's specifications with AP kit and TRAPEZE™ Kit (Chemicon).
Karyotyping
To analyse the karyotype, hES cells were treated with 10 μg/ml Demecolcine (Sigma) for two hours, harvested with 0.05% trypsin/EDTA (Invitrogen) and centrifuged at 700×rpm for three minutes. The pellet was resuspended in 5 ml of 0.56% KCl, and incubated for 15 minutes at RT. After repeated centrifugation, the supernatant was removed and cells were resuspended and fixed with 5 ml of an ice cold mixture of methanol/acetic acid (3:1) for five minutes at +4° C. The fixation of the cells was repeated twice, after that the cell suspension was placed onto microscope slides and the preparations were stained with Giemsa Modified Stain (Sigma). Metaphases from cells prepared in this manner were analyzed by a standard G-banding method. Quantity of 5/1000 metaphase spreads were revealed and 63 metaphases were analyzed.
Embryoid Body Formation
hES and phESC cell colonies were mechanically divided into clumps and placed in wells of a 24 well plate precoated with 1.5% agarose (Sigma) in medium containing 85% Knockout DMEM, 15% human umbilical cord blood serum, 1×MEM NEAA, 1 mM Glutamax, 0.055 mM β-mercaptoethanol, penicillin-streptomycin (50 U/50 mg), 4 ng/ml hrbFGF (all from Invitrogen, except serum). Human EBs were cultured for 14 days in suspension culture and placed on a culture dish to give outgrowth or cultivated in suspension for an additional week.
Neural differentiation was induced by the cultivation of two week old embryoid bodies attached to a culture dish surface over a period of a week in differentiation medium: DMEM/F12, B27, 2 mM Glutamax, penicillin-streptomycin (100 U/100 μg) and 20 ng/ml hrbFGF (all from Invitrogen). Some embryoid bodies gave rise to differentiated cells with neural morphology, others were dissected and additionally cultured to produce neurospheres.
Rhythmically beating embryoid bodies appeared spontaneously following five days of culture after plating on an adhesive surface in the same medium as was used for embryoid body generation.
HLA Typing
Genomic DNA was extracted from donor blood, hES, phESC cells, and human newborn skin fibroblasts (NSFs) with Dynabeads DNA Direct Blood from Dynal (Invitrogen). HLA typing was performed by PCR with allele-specific sequencing primers (PCR-SSP, Protrans) according to the manufacturer's specifications. HLA class I genes (HLA A*,B*,Cw*) were typed with PROTRANS HLA A*B*Cw* defining A*01-A*80, B*07-B*83, Cw*01-Cw*18 regions. HLA class II genes (HLA DRB1*, DRB3*, DRB4*, DRB5*, DQA1*, DQB1*) were analysed with PROTRANS HLA DRB1* defining DRB1*01-DRB1*16 (DR1-DR18), DRB3*, DRB4*, DRB5* regions and PROTRANS HLA DQB1* DQA1* defining DQB1*02-DQB1*06 (DQ2-DQ9), DQA1*0101-DQA1*0601 regions. PCR amplification was achieved: at 94° C. for 2 min; 10 cycles at 94° C. for 10 sec, 65° C. for 1 min; 20 cycles at 94° C. for 10 sec, 61° C. for 50 sec, 72° C. for 30 sec. Amplified products were detected in 2% agarose gel.
Affimetrix SNP Microarray Analysis
Genomic DNA was isolated from blood, cumulus cells, phESC and NSF by phenol/chloroform extraction method. These DNA samples obtained from four Caucasian subjects were genotyped with Affimetrix Mapping 50K Hind 240 Array (part of Affimetrix GeneChip Mapping 100K kit). Initially, the dataset contained 57,244 binary SNP markers. Since the number of markers is more than would be necessary to identify the equivalency of genomic samples and to study heterozygosity, 15 (chromosomes 1-15) out of 22 autosomal chromosomes were chosen. The shorter seven chromosomes were removed to reduce the chance that no marker, or only a single marker for a given chromosome, is selected during random sampling. The 1,459 markers were analyzed by Relcheck (version 0.67, Copyright ©) 2000 Karl W. Broman, Johns Hopkins University, Licensed under GNU General Public License version 2 (June 1991)).
Genomic Imprinting Analysis
Total nucleic acid was prepared as described Li et al. (J Biol Chem (2002) 277(16):13518-13527). RNA and DNA were extracted from cells using Tri-reagent (Sigma) or by using an RNA preparation kit from Qiagen (Valencia, Calif.).
Northern blots containing RNA from the various samples (see FIG. 3) were blotted onto filters by standard methods (See, e.g., Sambrook et al., Molecular Cloning: A Laboratory Manual, 1989, 2nd ed, Cold Spring Harbor Press). The Northern filter was hybridized with single stranded oligonucleotide probes that hybridized specifically to the mRNAs. The oligonucleotide probes were end-labeled with [γ32P]ATP (Amersham Biosciences). The filters were subsequently washed three times for 10 min each with 0.2×SSC (1×SSC=0.15 M NaCl and 0.015 M sodium citrate) containing 0.1% SDS at 60° C. and analyzed by Phosphorlmager (Molecular Dynamics). The sequences of the oligonucleotide probes were obtained from sequences based on the following Accession Nos.: NP002393 (Peg1—2 and Peg1_A; for these genes, human PEG1 is transcribed from two alternative promoters, resulting in the transcription of two isoforms, of which only one (isoform 1—2) is imprinted. Paternal expression isoform 1 occurs in conjunction with an unmethylated CpG island in exon 1 of the paternal allele, whereas the corresponding CpG island in the maternal gene (isoform 1_A) is fully methylated. See, e.g., Li et al. (2002), supra); CAG29346 (SNRPN); AF087017 (H19); NR—001564 (inactive X specific transcripts-XIST); and P04406 (GAPDH).
DNA Fingerprinting Analysis
Genomic DNA was isolated from blood, hES cells, and NSFs through a phenol/chloroform extraction, digested with HinfI restriction enzyme (Fermentas) and loaded in a 0.8% agarose gel. Following electrophoresis, denatured DNA was transferred to a nylon membrane (Hybond N, Amersham) by Southern blotting and hybridized with 32P-labeled (CAC) 5 oligonucleotide probe. mData were analysed after membrane exposition on X-ray film (Kodak XAR) using Cronex intensifying screens.
Monolocus PCR Genotyping
In order to determine allelic identities for minisatellite loci between blood donor DNA and stem cell DNA, 11 polymorphic sites ((1) 3′ Apolipoprotein B hypervariable minisatellite locus (3'ApoB); (2) D1S80 (PMCT118) hypervariable minisatellite locus (D1S80); (3) D6S366; (4) D16S359; (5) D7S820; (6) Human von Willebrand factor gene hypervariable minisatellite locus II (vWFII); (7) D13S317; (8) Human von Willebrand factor gene hypervariable microsatellite locus (vWA); (9) Human c-fms proto-oncogene for CFS-1 receptor gene microsatellite locus (CSF1PO); (10) Human thyroid peroxidase gene microsatellite locus (TPOX); and (11) Human tyrosine hydroxylase gene microsatellite locus (TH01)) were analyzed by PCR genotyping. Allele frequencies for known populations (i.e., Russian and Caucasian-American populations) determined for the above polymorphic sites were compared to allele frequencies of these sites in test samples (i.e., hES, NSF, and donor blood DNA). Chromosomal location, Genbank locus and locus definition, repeat sequence data, allelic ladder range, VNTR ladder size range, other known alleles, allele sizes, PCR protocols, and allele frequency results for the 11 minisatellite loci of the disclosed populations analyzed are provided below.
(1) 3′ Apolipoprotein B hypervariable minisatellite locus (3′ApoB VNTR)
Chromosomal location: 2p23-p23
GenBank locus and locus definition: APOB, apolipoprotein B (including Ag(x) antigen) untranslated region
Repeat sequence 5′-3′: (TATAATTAAATATT TTATAATTAAAATATT)n (SEQ ID NO: 1)
Allelic ladder size range (bases): 450+10+2 primer+links
VNTR ladder size range (# of repeats, according to Ludwig et al, 1989): 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50, 52
Other known alleles (# of repeats): 25, 27, 28, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49, 51, 53, 54, 55
Promega K562 DNA® Allele sizes (# of repeats): 36/36
PCR protocol:
|
|
Thermal cycler:DNA Technology Ltd., Russia
Initial Incubation:95° C., 2′
Cycling for 30 cycles:
Denaturation94° C., 1′
Elongation and primer linking60° C., 2′
Extension step:72° C., 5′
Hold step: 4° C., unlimited time
|
The analysis may be done as described in Verbenko et al. (Apolipoprotein B 3′-VNTR polymorphism in Eastern European populations. Eur J Hum Gen (2003) 11(1):444-451). See Table 4.
TABLE 4
|
|
Allele Frequencies for Russian Populations
Number of Alleles
AlleleAllele frequencyobserved
|
250.0011
300.07975
320.07168
330.0011
340.238227
350.0044
360.393375
370.0011
380.03636
390.0011
400.01413
420.0011
440.04241
450.0066
460.03331
480.06764
500.01110
520.0011
|
Homozygotes94
Heterozygotes333
Total samples427
(2) D1S80 (pMCT118) hypervariable minisatellite locus (D1S80 VNTR)
Chromosomal location: 1p35-36
GenBank locus and locus definition: Human D1S80 and MCT118 gene
Repeat sequence 5′-3′: (GAAGACAGACCACAG)n (SEQ ID NO: 2)
Allelic ladder size range (bases): 387-762
VNTR ladder size range (# of repeats): 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 34, 35, 36, 37, 40, 41
Other known alleles (# of repeats): 13, 14, 15, 38, 39,>41
Promega K562 DNA® Allele sizes (# of repeats): 18/29
PCR protocol:
|
|
Thermal cycler:DNA Technology Ltd., Russia
Initial Incubation:95° C., 2′
Cycling for 30 cycles:
Denaturation94° C., 45″
Primer linking60° C., 30″
Elongation72° C., 45″
Extension step:72° C., 5′
Hold step: 4° C., unlimited time
|
The analysis may be done as described in Verbenko et al. (Allele frequencies for D1S80 (pMCT118) locus in some Eastern European populations. J Forensic Sci (2003) 48(1):207-208). See Table 5.
TABLE 5
|
|
Allele Frequencies for Russian Populations
Number of Alleles
AlleleAllele frequencyobserved
|
180.28033
200.0172
210.0091
220.0425
230.0172
240.39046
250.0172
260.0253
280.0688
290.0091
300.0344
310.0597
330.0172
340.0081
360.0081
|
Homozygotes15
Heterozygotes44
Total samples59
(3) D6S366
Chromosomal location: 6q21-qter
GenBank locus and locus definition: NA
Allelic ladder size range (bases): 150-162
STR ladder size range (# of repeats): 12, 13, 15
Other known alleles (# of repeats): 10, 11, 14, 16, 17
Promega K562 DNA® Allele sizes (# of repeats): 13/14
PCR protocol:
|
|
Thermal cycler:DNA Technology Ltd., Russia
Initial Incubation:95° C., 2′
Cycling for 30 cycles:
Denaturation94° C., 1′
Elongation and primer linking60° C., 2′
Extension step:72° C., 5′
Hold step: 4° C., unlimited time
|
The analysis may be done as described in Efremov et al. (An expert evaluation of molecular genetic individualizing systems based on the HUMvWFII and D6S366 tetranucleotide tandem repeats. Sud Med Ekspert (1998) 41(2):33-36). See Table 6.
TABLE 6
|
|
Allele Frequencies for Russian Populations
Number of Alleles
AlleleAllele frequencyobserved
|
100.0083
110.05921
120.316112
130.25189
140.08530
150.17562
160.0157
170.0114
Total samples177
|
(4) D16S539
Chromosomal location: 16q24-qter
GenBank locus and locus definition: NA
Repeat sequence 5′-3′: (AGAT)n
Allelic ladder size range (bases): 264-304
STR ladder size range (# of repeats): 5, 8, 9, 10, 11, 12, 13, 14, 15
Promega K562 DNA™ Allele sizes (# of repeats): 11/12
PCR protocol:
|
|
Thermal cycler:DNA Technology Ltd., Russia
Initial Incubation:95° C., 2′
Cycling for 30 cycles:
Denaturation94° C., 45″
Primer linking64° C., 30″
Elongation72° C., 30″
Extension step:72° C., 5′
Hold step: 4° C., unlimited time
|
The analysis has been done as described in GenePrint™ STR Systems (Silver Stain Detection) Technical Manual No. D004. Promega Corporation, Madison, Wis. USA: 1993-2001. See Table 7.
TABLE 7
|
|
Allele Frequencies for Caucasian-Americans
AlleleAllele frequencyNumber of Alleles observed
|
60.0000
70.0000
80.02611
90.10745
100.07933
110.319134
120.269113
130.16770
140.03113
150.0021
Homozygotes57
Heterozygotes153
Total samples210
|
(5) D7S820
Chromosomal location: 7q11.21-22
GenBank locus and locus definition: NA
Repeat sequence 5′-3′: (AGAT)n
Allelic ladder size range (bases): 215-247
VNTR ladder size range (# of repeats): 6, 7, 8, 9, 10, 11, 12, 13, 14
Promega K562 DNA® Allele sizes (# of repeats): 9/11
PCR protocol:
|
|
Thermal cycler:DNA Technology Ltd., Russia
Initial Incubation:95° C., 2′
Cycling for 30 cycles:
Denaturation94° C., 45″
Primer linking64° C., 30″
Elongation72° C., 30″
Extension step:72° C., 5′
Hold step: 4° C., unlimited time
|
analysis has been done as described in GenePrint® STR Systems (Silver Stain Detection) Technical Manual No. D004. Promega Corporation, Madison, Wis. USA: 1993-2001. See Table 8.
TABLE 8
|
|
Allele Frequencies for D7S820 in Different Populations
Allele frequencyNumber ofAlleleNumber of
for Caucasian-AllelesfrequencyAlleles
AlleleAmericansobservedfor Russiansobserved
|
60.00210.00121
70.01040.00877
80.155650.1928155
90.152640.1480119
100.2951240.2524203
110.195820.2040164
120.121510.1580127
130.057240.029924
140.01250.00504
Homozygotes4392
Heterozygotes167310
Total samples210402
|
(6) Human von Willebrand factor gene hypervariable microsatellite locus II (vWFII)
Chromosomal location: 12p13.3-12p13.2
GenBank locus and locus definition: HUMvWFII, Human von Willebrand factor gene
Repeat sequence 5′-3′: (ATCT)n/(AGAT)n
Allelic ladder size range (bases): 154-178
STR ladder size range (# of repeats): 9, 11, 12, 13
Other known alleles (# of repeats): 8, 10, 14, 15
Promega K562 DNA® Allele sizes (# of repeats): 13/13
PCR protocol:
|
|
Thermal cycler:DNA Technology Ltd., Russia
Initial Incubation:95° C., 2′
Cycling for 30 cycles:
Denaturation94° C., 1′
Elongation and primer linking60° C., 2′
Extension step:72° C., 5′
Hold step: 4° C., unlimited time
|
The analysis has been done as described in Efremov et al. (An expert evaluation of molecular genetic individualizing systems based on the HUMvWFII and D6S366 tetranucleotide tandem repeats. Sud Med Ekspert (1998) 41(2):33-36). See Table 9.
TABLE 9
|
|
Allele Frequencies for Russian Populations
Number of Alleles
AlleleAllele frequencyobserved
|
90.08237
100.08840
110.392177
120.296134
130.06931
140.05826
150.0157
Total samples226
|
(7) D13S317
Chromosomal location: 13q22-q31
GenBank locus and locus definition: NA
Repeat sequence 5′-3′: (AGAT)n
Allelic ladder size range (bases): 165-197
STR ladder size range (# of repeats): 8, 9, 10, 11, 12, 13, 14, 15
Other known alleles (# of repeats): 7
Promega K562 DNA® Allele sizes (# of repeats): 8/8
PCR protocol:
|
|
Thermal cycler:DNA Technology Ltd., Russia
Initial Incubation:95° C., 2′
Cycling for 30 cycles:
Denaturation94° C., 45″
Primer linking64° C., 30″
Elongation72° C., 30″
Extension step:72° C., 5′.
Hold step: 4° C., unlimited time
|
The analysis has been done as described in GenePrint® STR Systems (Silver Stain Detection) Technical Manual No. D004. Promega Corporation, Madison, Wis. USA: 1993-2001. See Table 10.
TABLE 10
|
|
Allele Frequencies for D13S317 in Different Populations
Allele frequency forNumber ofAllele frequency forNumber of
AlleleCaucasian-AmericansAlleles observedRussiansAlleles observed
|
70.000000
80.143600.1393112
90.052220.088371
100.052220.068455
110.3051280.3706298
120.3071290.2040164
130.083350.087170
140.057240.042334
150.000000
Homozygotes6190
Heterozygotes149312
Total samples210402
|
(8) Human von Willebrand factor gene hypervariable microsatellite locus (vWA)
Chromosomal location: 12p 12pter
GenBank locus and locus definition: HUMVWFA31, Human von Willebrand factor gene
Repeat sequence 5′-3′: (AGAT)n
Allelic ladder size range (bases): 139-167
STR ladder size range (# of repeats): 14, 16, 17, 18
Other known alleles (# of repeats): 11, 12, 13, 15, 19, 20, 21
Promega K562 DNA® Allele sizes (# of repeats): 16/16
PCR protocol:
|
|
Thermal cycler:DNA Technology Ltd., Russia
Initial Incubation:95° C., 2′
Cycling for 30 cycles:
Denaturation94° C., 1′
Elongation and primer linking60° C., 2′
Extension step:72° C., 5′
Hold step: 4° C., unlimited time
|
The analysis has been done as described in GenePrint® STR Systems (Silver Stain Detection) Technical Manual No. D004. Promega Corporation, Madison, Wis. USA: 1993-2001. See Table 11.
TABLE 11
|
|
Allele Frequencies for HUMVWFA31 in Different Populations
Allele frequency forNumber of AllelesAllele frequency forNumber of Alleles
AlleleCaucasian-AmericansobservedRussiansobserved
|
130.00000.00252
140.131560.079664
150.082350.092074
160.211900.2127171
170.2651130.2836228
180.202860.2251181
190.087370.083367
200.02190.019916
210.00000.00121
Homozygotes3870
Heterozygotes175332
Total samples213402
|
(9) Human c-fms proto-oncogene for CSF-1 receptor gene microsatellite locus (CSF1PO)
Chromosomal location: 5q33.3-34
GenBank locus and locus definition: HUMCSF1PO, Human c-fms proto-oncogene
Repeat sequence 5′-3′: (AGAT)n
Allelic ladder size range (bases): 295-327
STR ladder size range (# of repeats): 7, 8, 9, 10, 11, 12, 13, 14, 15
Other known alleles (# of repeats): 6
Promega K562 DNA® Allele sizes (# of repeats): 9/10
PCR protocol:
|
|
Thermal cycler:DNA Technology Ltd., Russia
Initial Incubation:95° C., 2′
Cycling for 30 cycles:
Denaturation94° C., 45″
Primer linking64° C., 30″
Elongation72° C., 30″
Extension step:72° C., 5′
Hold step: 4° C., unlimited time
|
The analysis has been done as described in GenePrint® STR Systems (Silver Stain Detection) Technical Manual No. D004. Promega Corporation, Madison, Wis. USA: 1993-2001. See Table 12.
TABLE 12
|
|
Allele Frequencies for Caucasian-Americans
AlleleAllele frequencyNumber of Alleles observed
|
60.0000
70.0000
80.0021
90.03314
100.251108
110.309133
120.330142
130.06026
140.0146
150.0000
Homozygotes47
Heterozygotes168
Total samples215
|
(10) Human thyroid peroxidase gene microsatellite locus (TPOX)
Chromosomal location: 2p25.1-pter
GeneBank locus and locus definition: HUMTPOX, Human thyroid peroxidase gene
Repeat sequence 5′-3′: (AATG)n
Allelic ladder size range (bases): 224-252
STR ladder size range (# of repeats): 6, 7, 8, 9, 10, 11, 12, 13
Other known alleles (# of repeats): none
Promega K562 DNA® Allele sizes (# of repeats): 8/9
PCR protocol:
|
|
Thermal cycler:DNA Technology Ltd., Russia
Initial Incubation:95° C., 2′
Cycling for 30 cycles:
Denaturation94° C., 45″
Primer linking64° C., 30″
Elongation72° C., 30″
Extension step:72° C., 5′
Hold step: 4° C., unlimited time
|
The analysis has been done as described in GenePrint® STR Systems (Silver Stain Detection) Technical Manual No. D004. Promega Corporation, Madison, Wis. USA: 1993-2001. See Table 13.
TABLE 13
|
|
Allele Frequencies for Caucasian-Americans
AlleleAllele frequencyNumber of Alleles observed
|
60.0021
70.0000
80.528227
90.09340
100.05624
110.284122
120.03716
130.0000
Homozygotes76
Heterozygotes139
Total samples215
|
(11) Human tyrosine hydroxylase gene microsatellite locus (TH01)
Chromosomal location: 5q33.3-34
GenBank locus and locus definition: HUMTHO1, Human tyrosine hydroxylase gene
Repeat sequence 5′-3′: (AATG)n
Allelic ladder size range (bases): 179-203
STR ladder size range (# of repeats): 5, 6, 7, 8, 9, 10, 11
Other known alleles (# of repeats): 9.3
Promega K562 DNA® Allele sizes (# of repeats): 9.3/9.3
PCR protocol:
|
|
Thermal cycler:DNA Technology Ltd., Russia
Initial Incubation:95° C., 2′
Cycling for 30 cycles:
Denaturation94° C., 45″
Primer linking64° C., 30″
Elongation72° C., 30″
Extension step:72° C., 5′
Hold step: 4° C., unlimited time
|
The analysis has been done as described in GenePrint® STR Systems (Silver Stain Detection) Technical Manual No. D004. Promega Corporation, Madison, Wis. USA: 1993-2001. See Table 14.
TABLE 14
|
|
Allele Frequencies for Caucasian-Americans
AlleleAllele frequencyNumber of Alleles observed
|
50.0073
60.237101
70.14863
80.11750
90.15566
9.30.331141
10 0.0052
11 0.0000
Homozygotes50
Heterozygotes163
Total samples213
|
Results
The hES cells from this method display many features that are typical for embryonic stem cells: cytoplasmic lipid bodies, small cytoplasmic/nuclear ratio and clearly distinguishable nucleoli. The hES cell colonies display similar morphology to that reported previously for human embryonic stem cells derived after in vitro fertilization. The cells were immunoreactively positive for alkaline phosphatase (FIG. 1A), octamer-binding transcription factor 4 mRNA (Oct-4) (FIG. 1B), stage-specific embryonic antigen 1 (SSEA-1) (FIG. 1C),stage-specific embryonic antigen 3 (SSEA-3) (FIG. 1D), stage-specific embryonic antigen 4 (SSEA-4) (FIG. 1E), tumor rejection antigen 1-60 (TRA-1-60) (FIG. 1F), tumor rejection antigen 1-81 (TRA-1-81) (FIG. 1G), and negative for stage-specific embryonic antigen 1 (SSEA-1) (FIG. 1C), (which is positive for mouse embryonic stem cells, but not for human). Telomerase activity is often correlated with replicative immortality and is typically expressed in germ cells, cancer cells, and a variety of stem cells, including stem cells, but absent in most somatic cell types. The cells prepared by this method after three months in in vitro proliferation maintained their undifferentiated morphology and displayed high levels of telomerase activity (FIG. 2A). The pluripotency of the cells was investigated in vitro by embryoid body formation (FIGS. 2B, 2C), G-banded karyotyping shows that cells have normal human 46XX karyotype (FIG. 2D).
DNA fingerprinting analysis was performed on the blood of the oocyte donor, on the ES cells, and on the HNSF feeder cells by Southern blotting and hybridization with a 32P-labeled (CAC)s oligonucleotide probe (FIG. 2E), and monolocus polymerase chain reaction (PCR) with different locuses.
For monolocus PCR, genotyping revealed identical alleles for all loci (but one, D7S820) between blood (donor) DNA and OL1 DNA. See Table 15.
TABLE 15
|
|
Monolocus PCR genotyping.
LocusChromosomal
NNdefinitionlocationhESNSFBlood
|
1.3′ApoB2p24-p2336/4836/3636/48
2.D1S801p35-3618/2422/3118/24
3.D6S3666q21-qter13/1517/1713/15
4.D16S35916q24-qter 8/1312/13 8/13
5.D7S8207q11.21-2211/11 9/1010/11
6.vWFII12p13.3-12p13.211/13 9/1111/13
7.D13S31713q22-q31 9/1211/12 9/12
8.vWA12p12pter14/1817/1814/18
9.CSF1PO5q33.3-3412/1212/1312/12
10.TPOX2p25.1-pter 8/11 8/11 8/11
11.TH015q33.3-346/6 6/9.36/6
|
Heterozygosity (heterozygosis) of all heterozygous donor loci (but one, D7S820) was not changed in hES loci. Homozygosity (homozygosis) of D7S820 locus in hES DNA is a result of mutation (insertion of one AGAT monomer in microsatellite repeat) due to slipped-strand mispairing during DNA replication and DNA repair.
These results are in accordance with those obtained with multilocus DNA fingerprinting (when substantially identical fingerprint patterns for donor DNA and hES DNA were found).
FIG. 2E demonstrated heterozygosity of hES cells and their identity with the oocyte donor's blood, and there was no similarity between the hES cells and the feeder cells. The DNA profile of hES cell line was confirmed by PCR-based haplotype analysis using polymorphic genes within the MHC class I and class II. Total genomic DNA from the oocyte donor blood cells, from hES cells, and feeder HNSFs were genotyped and compared. The data demonstrated that hES cells and cells from donor blood were indistinguishable from each other and therefore should be considered autologous, and both distinguished from DNA of the feeder cells (Table 16).
TABLE 16
|
|
HLA Typing.
MHC IMHC II
HLA-AHLA-BHLA-CDRB1DQB1DQA1
|
pHES-1A*01B*15(63)Cw*04DRB1*12DQB1*06DQA1*01
A*02B*35Cw*0708DRB1*13DQB1*03DQA1*0505
DonorA*01B*15(63)Cw*04DRB1*12DQB1*06DQA1*01
A*02B*35Cw*0708DRB1*13DQB1*03DQA1*0505
HNSFA*25B*15(62)Cw*12DRB1*04DQB1*06DQA1*01
A*32B*18Cw*12DRB1*15DQB1*03DQA1*03
|
DNA fingerprinting and HLA typing analysis confirmed that the hES cells are heterozygous and contain the whole donor genetic material. These results coincide with data from parthenogenetic monkey stem cell lines (Vrana et al., Proc Natl Acad Sci USA (2003) 100(Suppl 1): 11911-11916), and do not coincide with data from parthenogenetic mouse stem cell lines (Lin et al., Stem Cells (2003) 21:153-161), which contains half of the donor genetic material.
The phESC lines display a morphology expected in hES cells, forming colonies with tightly packed cells, prominent nucleoli and a small cytoplasm to nucleus ratio (FIG. 4). These cells express traditional hES markers SSEA-3, SSEA-4, TRA-1-60, TRA-1-81, and OCT-4, and do not express SSEA-1, a positive marker for undifferentiated mouse embryonic stem cells (FIG. 4). The cells derived from all lines demonstrate high levels of alkaline phosphatase and telomerase activity (FIG. 5 and FIG. 6). G-banded karyotyping showed that phESC lines have a normal human 46,XX karyotype, with the exception of the phESC-7 line (FIG. 7). Approximately 91% of cells from the phESC-7 line have a 47,XXX karyotype and 9% of the cells have a 48,XXX,+6 karyotype. A different degree of X chromosome heteromorphism was observed in the lines; approximately 12% of the phESC-1 and phESC-6 lines; 42% for the phESC-5 line; and 70, 80, and 86% for the cell lines phESC7, phESC-3, and phESC-4, respectively (FIG. 7).
Comparative DNA profiling of was performed on all the phESC lines, the donor somatic cells and the feeder cells. These studies used Affimetrix SNP microarrays (Mapping 50K Hind 240 Arrays) to study chromosome changes and to confirm the genetic similarity of the phESC to the donor's somatic cells. All paired genotype relationships between phESC lines and their associated donor somatic cells were identified as “full siblings”, and all other combinations of pairs were identified as “unrelated”. Internal controls identified the paired genotype relationship between split cultures derived from the same phESC line as “monozygotic twins” (Table 17, Database S1).
TABLE 17
|
|
Database S1.
Database S1 Identifying DNA samples from phESC and related donors
genotypegenotypeputativeInferredLODLODLODLOD
12relationshiprelationshipIBS 0IBS 1IBS 2n_typedMZtwinspar/offfullsibshalfsibsunrelated
|
12unrelatedunrelated1666626311459−1503.03−300.45−23.15−8.410
13unrelatedunrelated2416166021459−1560.65−434.85−28.04−12.220
14unrelatedunrelated2256236111459−1535.94−400.61−31.39−14.390
15unrelatedunrelated2256236111459−1535.94−400.61−31.39−14.390
16unrelatedunrelated2436445721459−1642.35−445.78−31.74−14.540
17unrelatedunrelated2526385691459−1641.11−453.5−29.25−12.860
18unrelatedunrelated2506435661459−1656.02−460.02−32.86−15.320
19unrelatedunrelated2196575831459−1605.31−382.39−27.37−11.580
110unrelatedunrelated1587075941459−1591.43−279.21−26.37−10..890
111unrelatedunrelated1936685981459−1584.71−354.76−29.65−13..310
112unrelatedunrelated1666716221459−1523.1−300.5−30.53−13..920
23unrelatedfull sibs028211771459−440.02−146.30−167.42−363.63
24unrelatedunrelated2336275991459−1569.66−423.24−28.24−12.910
25unrelatedunrelated2336275991459−1569.66−423.24−28.24−12.910
26unrelatedunrelated2176505921459−1584.75−388.44−22.62−8.530
27unrelatedunrelated2436505661459−1645.94−437.91−23.23−8.720
28unrelatedunrelated2256495851459−1603.18−404.41−27.04−11.970
29unrelatedunrelated2106396101459−1532.75−360.46−24.72−9.890
210unrelatedunrelated1446836321459−1491.18−243.56−16.82−4.510
211unrelatedunrelated1726806071459−1556.46−310.03−23.5−9.70
212unrelatedunrelated1766676161459−1538.57−327.95−27.31−12..060
34unrelatedunrelated3364576661459−1391.57−599.92−30.6−14.620
35unrelatedunrelated3364576661459−1391.57−599.92−30.6−14.620
36unrelatedunrelated3224826551459−1415.98−571.23−26.08−11.860
37unrelatedunrelated3694426481459−1432.05−664.95−27.39−11.930
38unrelatedunrelated3344836421459−1449.86−597.75−31.68−15.140
39unrelatedunrelated3074936591459−1395.19−530.45−24.56−100
310unrelatedunrelated2156236211459−1503.92−364.97−17.26−4.430
311unrelatedunrelated2645826131459−1531.91−473.48−28.41−12..810
312unrelatedunrelated2545956101459−1544.73−460.57−29.92−13..880
45unrelatedMZ twins00145914590−379.58−45.47−401.67−677.74
46unrelatedunrelated3344756501459−1436.59−599.55−32.73−15.190
47unrelatedunrelated3654396551459−1418.34−656.01−31.6−14.560
48unrelatedunrelated3294866441459−1450.75−586.4−32.06−14.880
49unrelatedunrelated3324666611459−1395.18−590.12−28.69−12.940
410unrelatedunrelated2456066081459−1542.32−438.93−28.75−12..740
411unrelatedunrelated2735696171459−1530.97−492.84−29.03−12..340
412unrelatedfull sibs022412351459−326.17−162.340−183.44−393.46
56unrelatedunrelated3344756501459−1436.59−599.55−32.73−15.190
57unrelatedunrelated3654396551459−1418.34−656.01−31.6−14.560
58unrelatedunrelated3294866441459−1450.75−586.4−32.06−14.880
59unrelatedunrelated3324666611459−1395.18−590.12−28.69−12.940
510unrelatedunrelated2456066081459−1542.32−438.93−28.75−12..740
511unrelatedunrelated2735696171459−1530.97−492.84−29.03−12..340
512unrelatedfull sibs022412351459−326.17−162.340−183.44−393.46
67unrelatedfull sibs4517612381459−277.78−217.210−165.72−390.62
68unrelatedfull sibs4418712281459−289.8−201.320−153.75−365.51
69unrelatedunrelated3334816451459−1436.5−595.4−30.3−13.770
610unrelatedunrelated2406016181459−1518.17−425.03−27.11−11..530
611unrelatedfull sibs016412951459−209.27−191.660−213.25−440.56
612unrelatedunrelated2346156101459−1547.15−416.14−30.21−13..640
78unrelatedfull sibs3822511961459−326.62−150.160−121.55−334.09
79unrelatedunrelated3594736271459−1479.28−642.41−30.61−14.470
710unrelatedunrelated2526235841459−1598.35−443.81−28.88−13..090
711unrelatedfull sibs023012291459−318.49−137.930−159.55−389.58
712unrelatedunrelated2655836111459−1539.33−472.91−30.55−13..870
89unrelatedunrelated3474806321459−1472.41−625.68−30.93−14.310
810unrelatedunrelated2446146011459−1561.3−434−28.07−12..370
811unrelatedfull sibs017512841459−223.73−178.560−200.12−428.04
812unrelatedunrelated2366106131459−1539.08−417.14−29.32−13..140
910unrelatedfull sibs022812311459−315.15−152.880−174.27−392.91
911unrelatedunrelated2695676231459−1502.69−479.57−28.47−12..550
912unrelatedunrelated2456126021459−1557.25−438.53−26.07−11..150
1011unrelatedunrelated1876356371459−1478.7−328.06−25.52−10.60
1012unrelatedunrelated1816626161459−1534.36−329−25.2−10.60
|
DNA samples were numbered as follows: 1-human neonatal skin fibroblasts; 2-phESC-7 line donor; 3-phESC-7 line; 4-phESC-1 line; 5-phESC-1 line; 6-phESC-3 line; 7-phESC-4 line; 8-phESC-5 line; 9-phESC-6 line; 10-phESC-6 line donor; 11-phESC-3 to phESC-5 lines donor; and 12-phESC-1 line donor.
|
The result shows that only one pair (sample 4-5), has been identified as monozygotic (MZ) twins. Ten other pairs (samples 2-3, 4-12, 5-12, 6-7, 6-11, 7-8, 7-11, 8-11, 9-10) have been identified as full siblings, and all the other combination of pairs have been identified as unrelated. The IBS columns in the output display the number of markers at which
|
# the pair are both typed and share 0, 1, or 2 alleles identical by state (For MZ twins under ideal conditions of no genotyping errors, all markers must be placed under IBS = 2). The output does not display P (observed markers | given relationship) directly, but it displays LOD score —log10 {P(observed markers | putative relationship/P(observed markers | relationship
# for which maximum likelihood was obtained and thus the call was made)} as a measure of similarity. The smaller the LOD score is, the less likely the putative relationship between two samples it.
Comparative analysis of 1,459 SNP markers revealed phESC heterozygosity and showed that changes had occurred in the phESC cell genotype in comparison to the related donor somatic cell genotype. Some segments of the somatic cell genome that had formerly been heterozygous became homozygous in the related phESC line genome. This heterozygous to homozygous pattern occurred in 11-15% of the phESC-1, PhESC-3, phESC-4, phESC-5 and phESC-6 lines, and was 19% for the phESC7 line (Database S2). Moreover, genetic differences were observed between the phESC and phESC-5 lines that had been derived from the same oocyte donor (Table 18, Database S2).
TABLE 18
|
|
Database S2.
Database S2 Heterozygosity or phESC (Abbreviated as “pC”) Lines
Freq
chromo-RS IDbasepairA inpC-1N3-5pC-6pC-7
someSNP ID(dbSNP)basepair(Mb)CaucasianpC-1donorpC-3pC-4pC-5donorpC-6donorpC-7donor
|
1SNP_A-rs1075271937441223.7441220.436ABABBBABABABBBBBBBBB
1697748
1SNP_A-rs80610459772005.97720.631ABABAAABABABABABAAAA
1743594
1SNP_A-rs30179184026388.4026380.274ABABBBBBBBBBABABAAAB
1687843
1SNP_A-rs14748681197843011.978430.333BBBBAAAAAAAAAAAAAAAA
1647681
1SNP_A-rs14171441421139114.2113910.548AAAAABABABABAAAAABAB
1673737
1SNP_A-rs8603791841475618.4147560.25BBBBBBBBBBBBBBBBBBBB
1747116
1SNP_A-rs104929971951467719.5146770.631AAAABBBBBBBBABABAAAA
1662223
1SNP_A-rs5593462807795628.0779560.583BBABABABABABABABAAAB
1662225
1SNP_A-rs49494553178388631.7838860.382AAABABBBABABABABAAAA
1646469
1SNP_A-rs66611903387278233.8727820.274BBBBBBBBBBBBBBBBBBAB
1695076
1SNP_A-rs46530293455858534.5585850.274BBBBBBBBBBBBBBBBBBBB
1679571
1SNP_A-rs75314793679868036.798680.714AAAAAAAAAAAAAAAAAAAA
1675060
1SNP_A-rs10108053785823537.8582350.738AAAAABAABBABAAAABBBB
1753902
1SNP_A-rs66930763997219639.9721960.441AAAAABAABBABABABBBBB
1691977
1SNP_A-rs4077524047294840.4729480.333BBBBABAABBABBBBBBBBB
1723259
1SNP_A-rs75153404105596441.0559640.381ABABAAAAAAAAAAAABBBB
1692103
1SNP_A-rs46605754190242941.9024290.429BBBBBBBBBBBBAAAABBAB
1696731
1SNP_A-rs14084124278747042.787470.679AAAAAAAAAAAAAAAAAAAA
1701070
1SNP_A-rs17715514555273645.5527360.738AAAAAAAAAAAAAAAABBAB
1729559
1SNP_A-rs22451224735801547.3580150.598AAAAAAAAAAAABBBBBBAB
1670587
1SNP_A-rs18756455050190050.50190.524ABABBBBBBBBBBBBBBBBB
1711898
1SNP_A-rs6256435434918854.3491880.25BBBBBBBBBBBBBBBBBBBB
1645411
1SNP_A-rs104932065653117256.5311720.488AAAABBBBBBBBABABAAAB
1718210
1SNP_A-rs18318705733922457.3392240.524ABABABAABBABBBBBBBAB
1752670
1SNP_A-rs8527665799852957.9985290.564AAAAAAAAAAAAAAAABBAB
1669308
1SNP_A-rs19697725891712358.9171230.738AAAAAAAAAAAAABABAAAB
1681141
1SNP_A-rs104899086157678461.5767840.738AAAAAAAAAAAAAAAAAAAA
1690420
1SNP_A-rs27652496244147962.4414790.75AAAAAAAAAAAABBBBAAAB
1727043
1SNP_A-rs38619436343966763.4396670.405BBBBBBBBBBBBABABAAAB
1646105
1SNP_A-rs5922986400008164.0000810.25BBBBBBBBBBBBABABBBAB
1654674
1SNP_A-rs7466336450388764.5038870.692AAAABBBBBBBBBBBBAAAB
1708628
1SNP_A-rs11712796570051465.7005140.345BBBBBBBBBBBBBBBBBBAB
1713897
1SNP_A-rs12803106692884466.9288440.655ABABABBBAAABABABAAAB
1717648
1SNP_A-rs14089566784908467.8490840.536ABABABAABBABABABBBBB
1712508
1SNP_A-rs14139537083452570.8345250.571ABABAAAAAAAAABABAAAB
1688631
1SNP_A-rs13386557356963473.5696340.429ABABAAAAAAAAAAAABBBB
1720162
1SNP_A-rs104935397442759874.4275980.25AAAABBBBBBBBBBBBAAAB
1697494
1SNP_A-rs2773557500280575.0028050.345BBBBBBBBBBBBABABBBAB
1649261
1SNP_A-rs12508767590525375.9052530.345ABABABBBAAABABABBBBB
1744876
1SNP_A-rs39288527692602176.9260210.607AAAAAAAAAAAAABABAAAA
1739854
1SNP_A-rs104935967743826277.4382620.718AAAAAAAAAAAAABABAAAA
1687047
1SNP_A-rs12484807907126079.071260.357BBBBAAAAAAAAABABBBBB
1732619
1SNP_A-rs21274367979201779.7920170.488ABABABBBAAABBBBBAAAB
1664985
1SNP_A-rs23890168051135080.511350.738AAAAABBBAAABABABAAAB
1644541
1SNP_A-rs105186608209408882.0940880.738ABABAAAAAAAAAAAAAAAA
1645927
1SNP_A-rs65989918269798882.6979880.524BBBBABAAABABAAAAAAAA
1693780
1SNP_A-rs22686678550576785.5057670.321BBBBABAAABABBBBBBBAB
1674234
1SNP_A-rs3063228867343088.673430.726AAAAAAAAAAAAABABBBAB
1752288
1SNP_A-rs18312989021184090.211840.262ABABBBBBBBBBAAAABBAB
1736094
1SNP_A-rs42334299081192490.8119240.25BBBBABBBABABBBBBBBBB
1711115
1SNP_A-rs6654849137595191.3759510.512ABABAAAAAAAAAAAABBBB
1714794
1SNP_A-rs4908009230492692.3049260.369BBBBABBBABABABABBBAB
1675488
1SNP_A-rs67033109350076193.5007610.393ABABABAAABABBBBBBBBB
1656572
1SNP_A-rs2232379627674296.2767420.476BBBBBBBBBBBBAAAAAAAA
1755223
1SNP_A-rs19115009829184198.2918410.738AAAAAAAAAAAAABABAAAB
1691383
1SNP_A-rs1838587101983453101.9834530.525AAAAABAAABABABABAAAB
1725993
1SNP_A-rs7521799102944538102.9445380.619BBBBABAAABABAAABBBBB
1689489
1SNP_A-rs1576516104210964104.2109640.452ABABAAAAAAAABBBBAAAA
1684273
1SNP_A-rs1919894107240697107.2406970.381BBBBBBBBBBBBAAABBBBB
1733369
1SNP_A-rs10494081108114145108.1141450.667AAAAAAAAAAAAAAABBBAB
1715038
1SNP_A-rs2026485108978565108.9785650.333BBBBABBBABABBBBBBBAB
1699288
1SNP_A-rs6682717110527665110.5276650.441AAAAABBBABABAAABAAAA
1750726
1SNP_A-rs694180111438255111.4382550.464ABABBBBBBBBBBBBBAAAB
1648811
1SNP_A-rs1936061112187978112.1879780.595AAAAAAAAAAAABBABBBBB
1753842
1SNP_A-rs2359417113685242113.6852420.452BBBBBBBBBBBBAAABBBBB
1689065
1SNP_A-rs3767824118152606118.1526060.429BBBBBBBBBBBBBBBBBBBB
1746401
1SNP_A-rs1766803119095860119.095860.366BBABBBBBBBBBBBBBBBBB
1688653
1SNP_A-rs477992119969618119.9696180.286AAABBBBBBBABBBBBBBAB
1708513
1SNP_A-rs10494240143040559143.0405590.321ABABAAAAAAAABBABAAAB
1701244
1SNP_A-rs10494267148366991148.3669910.321BBBBBBBBBBBBABABBBBB
1706430
1SNP_A-rs2879490149760236149.7602360.381BBBBBBBBBBABAAAAAAAA
1680305
1SNP_A-rs10494303150706096150.7060960.571BBBBAAAAAAABABABAAAA
1723421
1SNP_A-rs884664151516798151.5167980.702AAAAAAAAAAABAAAAAAAA
1681003
1SNP_A-rs10494315154072954154.0729540.655ABABAAAAAAABBBBBBBAB
1667931
1SNP_A-rs919477155585918155.5859180.25BBBBBBBBBBBBBBBBBBAB
1647211
1SNP_A-rs1149392157241261157.2412610.286BBBBBBBBBBBBBBBBBBBB
1662451
1SNP_A-rs6683968158923070158.923070.571AAAABBBBBBBBAAAAAAAA
1695012
1SNP_A-rs869513159832184159.8321840.607AAAAAAAAAAAAAAAAAAAA
1716490
1SNP_A-rs4656422161688624161.6886240.25ABABAAAAABABBBBBBBBB
1727494
1SNP_A-rs4657482162563307162.5633070.405ABABBBBBBBBBABABBBBB
1646555
1SNP_A-rs2093658164086850164.086850.317AAAAAAAAABABAAAAAAAA
1743854
1SNP_A-rs1358948165590931165.5909310.31BBBBBBBBBBBBABABAAAB
1681011
1SNP_A-rs2205848166407951166.4079510.31BBBBBBBBBBBBBBBBBBAB
1751990
1SNP_A-rs10494487167046739167.0467390.298ABABBBBBBBBBBBBBBBBB
1736240
1SNP_A-rs3753538168481215168.4812150.691AAAAAAAAAAAAAAAABBAB
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12SNP_A-rs3858710118701913118.7019130.573AAABAAAAAAAAAAAAABAB
1748666
12SNP_A-rs1558062124778387124.7783870.524AAABABABABABAAABAAAA
1708029
12SNP_A-rs345676126581103126.5811030.643AAABBBBBBBBBBBABAAAA
1716508
12SNP_A-rs1983314129393207129.3932070.333BBABBBBBBBBBABABBBBB
1664795
13SNP_A-rs79852571878799718.7879970.524BBBBAAAAAAAABBABAAAA
1652867
13SNP_A-rs5352332044531720.4453170.321ABABBBBBBBBBBBBBAAAB
1686943
13SNP_A-rs28629012393323923.9332390.571ABABAAAAAAAABBABAAAA
1745741
13SNP_A-rs105073492567952825.6795280.274BBBBAAAAAAABBBBBABAB
1642868
13SNP_A-rs11614702832264428.3226440.31BBBBBBBBBBBBBBBBBBBB
1702806
13SNP_A-rs2136113034891330.3489130.705AAAAAAAAAAAAABABABAB
1664657
13SNP_A-rs2060793181861831.8186180.417BBBBBBBBBBBBABABABAB
1658585
13SNP_A-rs49417003238338132.3833810.262BBBBBBBBBBBBBBBBBBBB
1685897
13SNP_A-rs15380013368306833.6830680.274BBBBBBBBBBBBBBBBBBBB
1664201
13SNP_A-rs65633483558871435.5887140.397AAAABBBBBBBBABABBBBB
1742432
13SNP_A-rs22246553621750036.21750.298BBBBBBBBBBBBABABAAAA
1709846
13SNP_A-rs13592143677498236.7749820.452ABABAAAAAAAAABABABAB
1719156
13SNP_A-rs105074663736165737.3616570.75AAAAAAAAAAAAABABABAB
1699940
13SNP_A-rs21978793814318838.1431880.286ABABBBBBBBBBBBBBAAAA
1757710
13SNP_A-rs45660293913638739.1363870.691AAAAAAAAAAAAABABAAAA
1725889
13SNP_A-rs73227544022097740.2209770.31BBBBBBABABABBBBBBBBB
1648291
13SNP_A-rs14090754214345042.143450.5ABABABABABABAAAAAAAA
1644487
13SNP_A-rs93160204289229142.8922910.274BBBBABABABABBBBBBBBB
1692131
13SNP_A-rs92851534371057043.710570.536BBBBBBBBBBBBABABABAB
1683729
13SNP_A-rs105075444629874646.2987460.286BBBBBBBBBBBBABABABAB
1675092
13SNP_A-rs19838054860997148.6099710.655AAAAAAAAAAAABBABAAAA
1706220
13SNP_A-rs13596134966424149.6642410.381AAABAAAAAAAABBBBABAB
1656586
13SNP_A-rs93165135045228650.4522860.643AAABAAAAAAAABBABAAAA
1687875
13SNP_A-rs18919485253714652.5371460.429BBBBAAAAAAAAAAABBBBB
1699260
13SNP_A-rs93166425309397353.0939730.571AAABBBBBBBBBBBBBBBBB
1670827
13SNP_A-rs10109475392167053.921670.702AAABAAAAAAAAAAAAAAAA
1664927
13SNP_A-rs105075995458579954.5857990.286AAABBBBBBBBBBBBBBBBB
1686045
13SNP_A-rs22534085521669755.2166970.75AAAAABABABABBBABBBBB
1686285
13SNP_A-rs9597455671886956.7188690.274BBBBBBBBBBBBBBABBBBB
1668215
13SNP_A-rs104926035776982257.7698220.679AAAABBBBBBBBAAAAAAAA
1706400
13SNP_A-rs27866645957405459.5740540.417BBBBBBBBBBBBBBBBAAAA
1695368
13SNP_A-rs31022216065231660.6523160.488AAABABABABABAAABAAAA
1690895
13SNP_A-rs73230896169341361.6934130.56AAAAAAAAAAAAAAABAAAA
1731184
13SNP_A-rs21348986276705862.7670580.25BBBBAAAAAAAABBABBBBB
1697063
13SNP_A-rs93174066371702163.7170210.417BBABBBBBBBBBBBBBABAB
1707522
13SNP_A-rs73218236557097765.5709770.679BBBBAAAAAAAAAAAAAAAA
1645393
13SNP_A-rs104925926638568366.3856830.714AAABABABABABAAAAABAB
1726077
13SNP_A-rs1763436806925968.0692590.702AAABAAAAAAAAAAAAAAAA
1650731
13SNP_A-rs27824486880173468.8017340.643AAAAAAAAAAAAAAAAAAAA
1705084
13SNP_A-rs39092637175322271.7532220.321BBBBABABABABAAAABBBB
1715042
13SNP_A-rs105078127288677372.8867730.75AAAAABABABABBBBBAAAA
1732673
13SNP_A-rs93182267339198773.3919870.419BBBBAAAAAAAAAAAABBBB
1713643
13SNP_A-rs93183247464978774.6497870.658AAAABBBBBBBBAAAAABAB
1756880
13SNP_A-rs105078357535368275.3536820.691AAAAAAAAAAAABBABAAAA
1685215
13SNP_A-rs19525487603720576.0372050.333BBBBBBBBBBBBBBBBBBBB
1679595
13SNP_A-rs73261087778144277.7814420.393ABABAAAAAAAABBBBABAB
1687191
13SNP_A-rs39033887880282278.8028220.393BBBBABABABABAAAABBBB
1680379
13SNP_A-rs12154627959401179.5940110.536BBBBABABABABABABBBBB
1664955
13SNP_A-rs17446008015880980.1588090.631ABABABABABABBBBBAAAA
1727874
13SNP_A-rs105079178074143180.7414310.488AAAAAAAAAAAABBBBABAB
1710116
13SNP_A-rs93188688194732681.9473260.643ABABAAAAAAAAAAAAABAB
1663633
13SNP_A-rs93190228360196183.6019610.345BBBBABABABABABABABAB
1693530
13SNP_A-rs13315678479381684.7938160.56AAAAAAAAAAAAAAAAAAAA
1706422
13SNP_A-rs9954758755803687.5580360.357ABABBBBBBBBBABABBBBB
1733077
13SNP_A-rs11134788890838988.9083890.417AAAAABAAABABABABABAB
1679861
13SNP_A-rs6655309057194790.5719470.726AAAAAAAAAAAAABABAAAA
1649205
13SNP_A-rs19264899146599091.465990.524ABABAAAAAAAAAAAAABAB
1726887
13SNP_A-rs9130059227584492.2758440.607ABABBBBBBBBBAAAAAAAA
1714183
13SNP_A-rs93018769281968892.8196880.56AAAABBBBBBBBAAAAAAAA
1701716
13SNP_A-rs14129389366165793.6616570.726AAAAAAAAAAAAAAAAAAAA
1681625
13SNP_A-rs93020019426139394.2613930.274AAAABBBBBBBBABABBBBB
1648409
13SNP_A-rs73247819503275495.0327540.405ABABBBBBABABBBBBBBBB
1741482
13SNP_A-rs46034159661063996.6106390.631ABABAAAAAAAAABABAAAB
1661319
13SNP_A-rs2850679753641697.5364160.691AAABBBBBABABAAAAAAAA
1664929
13SNP_A-rs18865539844873998.4487390.486BBBBAAAAABABAAAABBAB
1709292
13SNP_A-rs27603069984167299.8416720.298BBBBBBBBBBBBABABBBBB
1749428
13SNP_A-rs10508075101237184101.2371840.464AAABAAAAABABABABAAAA
1703098
13SNP_A-rs1015795102023701102.0237010.488AAABBBBBBBBBAAAABBBB
1680317
13SNP_A-rs279927102539019102.5390190.643AAAAAAAAAAAAAAAABBAB
1704124
13SNP_A-rs1033147103460337103.4603370.333AAAABBBBBBBBABABBBBB
1752530
13SNP_A-rs9300981104440279104.4402790.286BBABBBBBBBBBABABBBAB
1654228
13SNP_A-rs7318881105459909105.4599090.671BBBBAAAAAAAABBBBBBBB
1715354
13SNP_A-rs7327250106243682106.2436820.329BBABBBBBBBBBBBABBBBB
1645715
13SNP_A-rs1320446106965333106.9653330.679BBBBBBBBABABBBABAAAA
1756346
13SNP_A-rs231604107524007107.5240070.381AAAABBBBBBBBBBBBBBBB
1732084
13SNP_A-rs4772985108080882108.0808820.25BBBBBBBBBBBBBBBBBBBB
1681321
13SNP_A-rs10492480108947427108.9474270.333BBBBAAAAAAAAAAAABBBB
1648777
13SNP_A-rs2183850110513987110.5139870.714BBBBAAAAAAAABBBBAAAA
1654860
14SNP_A-rs19528051958619519.5861950.345BBBBBBBBBBBBBBBBABAB
1733261
14SNP_A-rs19232251101922.5110190.429BBABAAAAAAAAABABAAAA
1702470
14SNP_A-rs49830412449597824.4959780.595BBABABAABBABAAAAABAB
1645139
14SNP_A-rs104833312654680826.5468080.417ABABBBBBBBBBABABAAAA
1676969
14SNP_A-rs49816582723458527.2345850.732AAAAAAAAAAAAABABAAAA
1680111
14SNP_A-rs23334232814693928.1469390.381ABABBBBBBBBBBBBBBBBB
1734437
14SNP_A-rs104833502888590628.8859060.738AAAABBBBBBBBAAAAAAAA
1669916
14SNP_A-rs2258422962268729.6226870.441ABABBBBBBBBBABABABAB
1732697
14SNP_A-rs12788913146481331.4648130.595AAAAABAAABABBBBBABAB
1656700
14SNP_A-rs93229293337747133.3774710.345ABABABBBABABBBBBBBBB
1740154
14SNP_A-rs7994933462162634.6216260.691ABABABBBABABAAAAAAAA
1757044
14SNP_A-rs8474983554642835.5464280.607AAAAAAAAAAAAAAAAAAAA
1676887
14SNP_A-rs19503613610197536.1019750.329ABABBBBBBBBBABABABAB
1665507
14SNP_A-rs49015963765995637.6599560.667ABABAAAAAAAAABABBBBB
1705178
14SNP_A-rs65718693824821038.248210.679AAAAABABABABABABAAAA
1654996
14SNP_A-rs104835113958771439.5877140.571ABABABABABABABABABAB
1708854
14SNP_A-rs104983604067072340.6707230.476ABABBBBBBBBBBBBBABAB
1653001
14SNP_A-rs19518744138721741.3872170.345AAAAABABABABBBBBAAAA
1753660
14SNP_A-rs20103384589563145.8956310.655AAAABBBBBBBBAAAAAAAA
1653419
14SNP_A-rs104835734693222746.9322270.357BBBBAAAAAAAAAAAAABAB
1663303
14SNP_A-rs6983404761185347.6118530.585ABABAAAAAAAAAAAABBBB
1664801
14SNP_A-rs71462914817213148.1721310.274BBBBBBBBBBBBBBBBABAB
1722201
14SNP_A-rs80069724869075348.6907530.31BBBBABABAAABAAAAABAB
1650017
14SNP_A-rs104984204948379349.4837930.476ABABABABBBABABABBBBB
1720778
14SNP_A-rs9636265015743950.1574390.691AAAAAAAAAAAAABABAAAA
1743320
14SNP_A-rs19565745116302651.1630260.655AAAAAAAAAAAAAAAAABAB
1641756
14SNP_A-rs71513065227387052.273870.607ABABBBBBBBBBAAAAABAB
1669704
14SNP_A-rs8770185289277652.8927760.451BBBBABABAAABABABABAB
1748272
14SNP_A-rs13829785578893855.7889380.536AAAABBBBBBBBAAABAAAA
1714357
14SNP_A-rs104836795650379956.5037990.61BBABABABAAABAAAAABAB
1714205
14SNP_A-rs2383765712966557.1296650.357AAABBBBBBBBBAAABABAB
1654106
14SNP_A-rs104984885865887658.6588760.451BBBBABABBBABAAAAAAAA
1690578
14SNP_A-rs93233535924080059.24080.619AAAAABABAAABAAAAAAAA
1690058
14SNP_A-rs22962746098693160.9869310.75BBABAAAAAAAAAAAAABAB
1671347
14SNP_A-rs92855906152146961.5214690.417AAAAAAAAAAAABBABBBBB
1755551
14SNP_A-rs12715826463445664.6344560.441BBBBAAAAAAAABBBBBBBB
1707294
14SNP_A-rs104838056732540467.3254040.329BBABABABBBABBBBBABAB
1648725
14SNP_A-rs19565286785872167.8587210.631BBBBAAAAAAAABBABABAB
1699466
14SNP_A-rs7493976941406869.4140680.262BBBBAAAAAAAABBBBBBBB
1682431
14SNP_A-rs22151327154554271.5455420.262AAABBBBBBBBBAAAAABAB
1674164
14SNP_A-rs28039717218222772.1822270.713AAAAAAAAAAAAAAAAABAB
1672631
14SNP_A-rs10282587544777575.4477750.726AAAAABABBBABAAAAAAAA
1648423
14SNP_A-rs71521537626570876.2657080.286BBBBBBBBBBBBAAAABBBB
1700204
14SNP_A-rs71566717699162876.9916280.7AAAAABABBBABAAAABBBB
1701478
14SNP_A-rs104839057804397878.0439780.429BBBBAAAAAAAABBBBBBBB
1706776
14SNP_A-rs9978427861423378.6142330.679AAAAAAAAAAAAAAABABAB
1667157
14SNP_A-rs20498267938306379.3830630.345BBBBBBBBBBBBBBBBBBBB
1722889
14SNP_A-rs23720838186028881.8602880.452ABABAAAAAAAABBABABAB
1645339
14SNP_A-rs23724248301724883.0172480.438AAAABBBBBBBBAAAABBBB
1704748
14SNP_A-rs80034238353354183.5335410.643BBBBABABAAABAAAAAAAA
1757272
14SNP_A-rs15303258478190984.7819090.702ABABAAAAAAAAAAABABAB
1644835
14SNP_A-rs104986048623883686.2388360.298BBBBBBBBBBBBBBBBABAB
1680733
14SNP_A-rs80182738686795686.8679560.524AAAABBBBBBBBAAAAAAAA
1702796
14SNP_A-rs4299238748112687.4811260.405BBBBAAAAAAAAAAAABBBB
1687761
14SNP_A-rs17420839025642390.2564230.321ABABABABABABABABABAB
1725723
14SNP_A-rs104986279104187291.0418720.583AAAABBBBBBBBAAAAABAB
1661389
14SNP_A-rs21485679324440393.2444030.286BBBBBBBBBBBBAAAABBBB
1705392
14SNP_A-rs14569889755776097.557760.679ABABAAAAAAAAAAAABBBB
1734665
14SNP_A-rs2003319845729898.4572980.488ABABAAAAAAAAABABAAAA
1684765
14SNP_A-rs39180519902383799.0238370.61BBABAAAAAAAAABABAAAA
1682935
14SNP_A-rs10484072102695759102.6957590.631AAAAABABABABBBBBABAB
1734911
14SNP_A-rs1048257104475429104.4754290.667AAAAABABABABBBBBABAB
1659209
15SNP_A-rs14051862130680621.3068060.441BBABBBBBBBBBBBBBBBBB
1669336
15SNP_A-rs21696372551777625.5177760.262BBBBAAAAAAAABBBBBBBB
1690082
15SNP_A-rs105196352733040427.3304040.607BBBBABABABABBBABBBAB
1643639
15SNP_A-rs47794622802628728.0262870.598BBBBABABABABAAAAAAAA
1740804
15SNP_A-rs22195072964692729.6469270.691AAAAAAAAAAAABBABAAAA
1722463
15SNP_A-rs105197373075674930.7567490.381BBBBBBBBBBBBBBBBBBBB
1730684
15SNP_A-rs13439003143189031.431890.667AAAAABABABABAAABBBBB
1648795
15SNP_A-rs105199563284913332.8491330.345ABABBBBBBBBBBBBBAAAB
1755583
15SNP_A-rs19486503382734033.827340.738AAAAAAAAAAAAABABAAAB
1699406
15SNP_A-rs105188683438135334.3813530.655AAAAABABABABABABAAAA
1645977
15SNP_A-rs4711224134586641.3458660.3AAAABBBBBBBBBBBBAAAB
1665819
15SNP_A-rs105190444416916644.1691660.381BBBBABABABABBBBBBBBB
1673073
15SNP_A-rs4937284867824748.6782470.441BBBBBBBBBBBBBBBBBBBB
1740676
15SNP_A-rs14782005194827951.9482790.357BBABBBBBBBBBABABBBBB
1709940
15SNP_A-rs25532225265704052.657040.691BBBBAAAAAAAAABABAAAB
1720532
15SNP_A-rs45347765540806855.4080680.463AAAAABABABABABBBBBAB
1654466
15SNP_A-rs15505745600066056.000660.536AAAABBBBBBBBAAAAAAAB
1752856
15SNP_A-rs20337215860926758.6092670.714AAABABABABABAAAAAAAB
1735597
15SNP_A-rs39359625961159359.6115930.536AAABAAAAAAAAAAAAAAAB
1642536
15SNP_A-rs105191486050765560.5076550.25BBBBBBBBBBBBBBBBBBBB
1726387
15SNP_A-rs26528246120705461.2070540.286BBBBBBBBBBBBBBBBBBBB
1750348
15SNP_A-rs105187076515267665.1526760.488AAABABABABABAAAAAAAA
1741266
15SNP_A-rs3050026792895967.9289590.595AAAAAAAAAAAABBBBBBBB
1739192
15SNP_A-rs21281126997334069.973340.262BBBBBBBBBBBBBBBBBBBB
1677047
15SNP_A-rs38983527430882574.3088250.631BBABABABAAABBBBBAAAA
1698770
15SNP_A-rs14463127519924475.1992440.738AAAAAAAAAAAAABABAAAB
1654378
15SNP_A-rs71636897635253376.3525330.488AAABABABAAABABABBBBB
1657306
15SNP_A-rs10014607729193477.2919340.56AAAAABABBBABABABAAAB
1701268
15SNP_A-rs13203237912850279.1285020.59AAAAAAAAAAAAAAAAAAAA
1689635
15SNP_A-rs18469118025570580.2557050.329AAAABBBBBBBBABABBBBB
1749864
15SNP_A-rs105205858346251083.462510.286BBABABABAAABBBBBBBAB
1714319
15SNP_A-rs19616018403061084.030610.31BBBBABABAAABBBBBBBAB
1654264
15SNP_A-rs11229078470837184.7083710.691AAAAABABBBABAAAAAAAA
1650691
15SNP_A-rs105206558588741585.8874150.595BBABAAAAAAAAAAAAAAAB
1665669
15SNP_A-rs38174288721625187.2162510.75AAAAAAAAAAAAABABAAAA
1694944
15SNP_A-rs10795378967528789.6752870.452ABABABABAAABBBBBBBBB
1683397
15SNP_A-rs105207109068899890.6889980.287BBBBBBBBBBBBBBABBBAB
1752072
15SNP_A-rs19892699161105691.6110560.305BBBBBBBBBBBBBBBBBBBB
1731798
15SNP_A-rs105207549276041392.7604130.548AAAAAAAAAAAAAAAAAAAA
1728656
15SNP_A-rs43211439395737293.9573720.262BBBBBBBBBBBBBBBBBBBB
1700188
15SNP_A-rs15514669934461999.3446190.345ABABABABABABBBBBABAB
1686439
15SNP_A-rs352716100155950100.155950.31AAAABBBBBBBBBBABAAAA
1647533
|
The results show heterozygosity of derived phESC lines and displays changes in genotype by comparison with the related donor genotype. Portions of heterozygous segments of the donor genome became homozygous in phESC. Chromosome-chromosome number; RS ID-RS number in dbSNP database; Base pair-base
|
# pair distance as recorded by Affimetrix GeneChip; Freq A in Cauc-the frequency of A allele in Caucasian population.
In prior research, parthenogenetic activation of mouse oocytes has resulted in homozygous embryonic stem cell lines (Lin et al., Stem Cells (2003) 21:152). In human oocytes, the suppression of the second meiotic division after oocyte parthenogenetic activation and the generation of diploid embryos does not lead to the derivation of wholly homozygous hES cells.
Based on the HLA-typing results, differentiated cells derived from all phESC lines should be wholly histocompatible with the oocyte donors, making this a method to create cells of therapeutic use (Table 19).
TABLE 19
|
|
HLA-typing for phESC cell lines
MHC IMHC II
HLA-AHLA-BHLA-CDRB1DQB1DQA1
|
phESC-1A*01B*15(63)Cw*04DRB1*12DQB1*06DQA1*01
A*02B*35Cw*0708DRB1*13DQB1*03DQA1*0505
phESC-1A*01B*15(63)Cw*04DRB1*12DQB1*06DQA1*01
donorA*02B*35Cw*0708DRB1*13DQB1*03DQA1*0505
phESC-3, 4, 5A*02B*52Cw*03DRB1*01DQB1*05DQA1*0101
A*03B*22Cw*04DRB1*03DQB1*02DQA1*05
phESC-3, 4, 5A*02B*52Cw*03DRB1*01DQB1*05DQA1*0101
donorA*03B*22Cw*04DRB1*03DQB1*02DQA1*05
phESC-6A*02B*07Cw*04DRB1*04DQB1*06DQA1*01
A*03B*27Cw*07DRB1*15DQB1*03DQA1*03
phESC-6A*02B*07Cw*04DRB1*04DQB1*06DQA1*01
donorA*03B*27Cw*07DRB1*15DQB1*03DQA1*03
phESC-7A*01B*38Cw*06DRB1*13DQB1*06DQA1*0106
A*02B*57Cw*12DRB1*14DQB1*06DQA1*0103
phESC-7A*01B*38Cw*06DRB1*13DQB1*06DQA1*0106
donorA*02B*57Cw*12DRB1*14DQB1*06DQA1*0103
NSFA*25B*15(62)Cw*12DRB1*04DQB1*06DQA1*01
A*32B*18Cw*12DRB1*15DQB1*03DQA1*03
|
DNA-profiling of the genetic material derived from the human fibroblasts used as feeder cells revealed no contamination of the phESC cell lines with material from the human fibroblasts (Table 19).
The phESC-1 line remained undifferentiated during ten months of culture, spanning 35 passages. The other cell lines were successfully cultivated over at least 21 passages. The cells from all phESC lines formed cystic embryoid bodies in suspension culture and gave rise to derivatives of all three germ layers: ectoderm, mesoderm, and endoderm, after differentiation in vitro (FIG. 4). Approximately 5% of embryoid bodies from the phESC-1 line gave rise to beating cells five days following plating. The phESC-6 line produced pigmented epithelial-like cells (FIG. 41, K). Ectoderm differentiation is presented by positive immunocytochemical staining for neuron specific markers neurofiliment 68 (FIG. 4A), NCAM (FIG. 4B), beta III-tubulin (FIG. 4C) and the glial cell marker GFAP (FIGS. 4D, M). Differentiated cells were positive for mesoderm markers including alpha-actinin (FIG. 4G) and desmin (FIG. 4J), which are muscle specific markers, and the endothelial markers PECAM-1 (FIG. 4E) and VE-Cadherin (FIG. 4F). Endoderm differentiation is presented by positive staining of differentiated derivatives for alpha-fetoprotein. These data demonstrate that phESC can be differentiated into the three germ layers that lead to all cell types of a human body.
The altered karyotype of phESC-7 may be a reason to exclude it form clinical use. Alterations of genomic imprinting in human embryos can contribute to the development of disorders linked to maternally or paternally expressed genes (Gabriel et al., Proc Natl Acad Sci USA (1998) 95:14857). In order to investigate other characteristics of the phESC lines, and to determine their suitability for use in cell therapy, imprinting analysis was performed.
Northern blots were made and screened with DNA probes SNRPN, Peg1—2, Peg1_A, H19, and GAPDH (as an internal control) as outlined above. Blotted nucleic acids were obtained from NSF, neonatal skin fibroblasts; hES, human embryonic stem cell line derived from fertilized oocytes; 1, phESC-1; 2, phESC-3, 3, phESC-4, 4, phESC-5; 5, phESC-6; 6 phESC-7. NSF RT-, hES RT-, 1 RT- are negative controls. FIG. 3 shows the results of the imprinting blot.
The maternal imprinting gene, Peg1_A shows strong binding in all of the cell lines tested. Weaker (relative to Peg1_A), but consistent binding was observed in all of the cell lines for the maternal imprinting gene H19. SNRPN shows binding predominantly in NSF, hES, phESC-4, and phESC-6. Peg1—2 shows binding predominantly in NSF, hES, phESC-1 (weaker signal), phESC-3, phESC-5, and phESC-6. GAPDH binding confirmed similar loading of RNA in all lanes.
Although the invention has been described with reference to the above examples, it will be understood that modifications and variations are encompassed within the spirit and scope of the invention. Accordingly, the invention is limited only by the following claims.
REFERENCES
- 1. J. Cibelli et al., Methods for making and using reprogrammed human somatic cell nuclei and autologous and isogenic human stem cells. US Patent Application No. 20030232430, Dec. 18, 2003.
- 2. H. Lin et al., Multilineage potential of homozygous stem cells derived from metaphase II oocytes. Stem Cells (2003) 21:153-161
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