Patent Application
20100248981
The invention relates to systems and methods for examining biological material. In particular, the invention relates to devices, methods and systems to ensure proper orientation and installation of trays for processing nucleic acid arrays. In a preferred embodiment of the invention, the method comprises a first orientation marking on a tray and a second orientation marking on a deck, indicating the proper station in which the tray is placed for a specific process.
The invention relates, in general, to synthesized nucleic acid probe arrays, such as Affymetrix GENECHIP® probe arrays, and spotted probe arrays. These biological microarrays have been used to generate unprecedented amounts of information about biological systems. For example, the GENECHIP® Human Genome U133 Plus 2.0 Array available from Affymetrix, Inc. of Santa Clara, Calif., is comprised of one microarray containing 1,300,000 oligonucleotide features covering more than 47,000 transcripts and variants that include 38,500 well characterized human genes. Furthermore, the GENECHIP® Mapping 500K Array Set available from Affymetrix, Inc. of Santa Clara, Calif., is comprised of two microarrays capable of genotyping on average 250,000 SNPs per array. Analysis of expression and genotype data from such microarrays may lead to the development of new drugs and new diagnostic tools. Merely by way of example, the invention is described as it applies to a four-peg instrumentation, but it should be recognized that the invention has a broader range of applicability.
A biological microarray often includes nucleic acid probes that are used to extract sequence information from nucleic acid samples. The nucleic acid samples are exposed to the nucleic acid probes under certain conditions that would allow hybridization. Afterwards, the biological microarray is processed and scanned to determine to which probes the nucleic acid samples have hybridized. Based on such determination, the sequence information is obtained by comparing patterns of hybridization and non-hybridization. As an example, the sequence information can be used for sequencing nucleic acids, or diagnostic screening for genetic diseases or for the presence of a particular pathogen or a strain of pathogen.
The processing of the biological microarray prior to scanning is often performed by a fluidic system. For example, the fluidic system includes a fluidic station, which can wash and stain the microarray. With the advancement of the microarray design, the fluidic system often needs to be modified in order to improve automation and lower cost. Hence it is highly desirable to improve techniques for processing microarrays.
The invention relates in general to biological microarray techniques. More particularly, the invention provides a system and method for processing a large number of biological microarrays. Merely by way of example, the invention is described as it applies to 4-peg instrument, but it should be recognized that the invention has a broader range of applicability.
Systems, methods, and products to address these and other needs are described herein with respect to illustrative, non-limiting, implementations. Various alternatives, modifications and equivalents are possible. For example, certain systems, methods, and computer software products are described herein using exemplary implementations for analyzing data from arrays of biological materials such as, for instance, Affymetrix GENECHIP® probe arrays. However, these systems, methods, and products may be applied with respect to many other types of probe arrays and, more generally, with respect to numerous parallel biological assays produced in accordance with other conventional technologies and/or produced in accordance with techniques that may be developed in the future. For example, the systems, methods, and products described herein may be applied to parallel assays of nucleic acids, PCR products generated from cDNA clones, proteins, antibodies, or many other biological materials. These materials may be disposed on slides (as typically used for spotted arrays), on substrates employed for GENECHIP® arrays, or on beads, optical fibers, or other substrates or media, which may include polymeric coatings or other layers on top of slides or other substrates. Moreover, the probes need not be immobilized in or on a substrate, and, if immobilized, need not be disposed in regular patterns or arrays. For convenience, the term “probe array” will generally be used broadly hereafter to refer to all of these types of arrays and parallel biological assays.
According to one embodiment of the invention, an automated and flexible liquid handling system for processing nucleic acid arrays includes a computer system for processing and acquiring data from the nucleic acid arrays and a deck comprising a plurality of stations. Each station holds a tray for a specific process and is labeled with a first orientation marking to indicate the specific process. Moreover, a plurality of labeled trays containing a plurality of wells in rows is also provided. Reagents can be placed into the wells to interact with the nucleic acid arrays. At least one labeled tray comprises a corresponding second orientation marking to ensure that each labeled tray is properly placed in the corresponding station on the deck.
In a preferred embodiment, the nucleic acid arrays are attached to pegs, wherein the pegs holding the nucleic acid arrays are mounted on a strip. The process steps include a wash step, hybridization step, stain step, antibody step, and a scan step. The deck can be mounted and fixed onto the instrument such that the trays on the deck are accessible to a user. Furthermore, a latch is provided to reliably ensure that a tray slides into place on the deck. In another embodiment of the invention, the orientation marking on a tray may be distinguished from other orientation markings on other trays by shape, color, pattern, or combination thereof.
Depending upon the embodiment, one or more of these benefits may be achieved. These benefits and various additional objects, features and advantages of the invention can be fully appreciated with reference to the detailed description and accompanying drawings that follow. The above embodiments and implementations are not necessarily inclusive or exclusive of each other and may be combined in any manner that is non-conflicting and otherwise possible, whether they be presented in association with a same, or a different, embodiment or implementation. The description of one embodiment or implementation is not intended to be limiting with respect to other embodiments and/or implementations. Also, any one or more function, step, operation, or technique described elsewhere in this specification may, in alternative implementations, be combined with any one or more function, step, operation, or technique described in the summary. Thus, the following embodiments and implementations are illustrative rather than limiting.
The above and further features will be more clearly appreciated from the following detailed description when taken in conjunction with the accompanying drawings. In functional block diagrams, rectangles generally indicate functional elements and parallelograms generally indicate data. In method flow charts, rectangles generally indicate method steps and diamond shapes generally indicate decision elements. All of these conventions, however, are intended to be typical or illustrative, rather than limiting.
The invention relates in general to biological microarray techniques. More particularly, the invention provides a system and method for processing a large number of biological microarrays. Merely by way of example, the invention is described as it applies to 4-peg instrumentation, but it should be recognized that the invention has a broader range of applicability. The description below is designed to present specific embodiments and not to be construed as limiting in any way. Also, reference will be made to articles and patents to show general features that are incorporated into the present disclosure, but the invention is not limited by these descriptions.
Reference will now be made in detail to exemplary embodiments of the invention. While the invention will be described in conjunction with the exemplary embodiments, it will be understood that they are not intended to limit the invention to these embodiments. On the contrary, the invention is intended to encompass alternatives, modifications and equivalents, which may be included within the spirit and scope of the invention.
The invention relates to diverse fields impacted by the nature of molecular interaction, including chemistry, biology, medicine and diagnostics. Methods disclosed herein are advantageous in fields, such as those in which genetic information is required quickly, as in clinical diagnostic laboratories or in large-scale undertakings such as the Human Genome Project.
The invention has many embodiments and relies on many patents, applications and other references for details known to those of the art. Therefore, when a patent, application, or other reference is cited or repeated below, it should be understood that the entire disclosure of the document cited is incorporated by reference in its entirety for all purposes as well as for the proposition that is recited. All documents, i.e., publications and patent applications, cited in this disclosure, including the foregoing, are incorporated herein by reference in their entireties for all purposes to the same extent as if each of the individual documents were specifically and individually indicated to be so incorporated herein by reference in its entirety.
As used in this application, the singular form “a,” “an,” and “the” include plural references unless the context clearly dictates otherwise. For example, the term “an agent” includes a plurality of agents, including mixtures thereof.
An individual is not limited to a human being but may also be other organisms including, but not limited to, mammals, plants, bacteria, or cells derived from any of the above.
Throughout this disclosure, various aspects of this invention can be presented in a range format. It should be understood that when a description is provided in range format, this is merely for convenience and brevity and should not be construed as an inflexible limitation on the scope of the invention. Accordingly, the description of a range should be considered to have specifically disclosed all the possible sub-ranges as well as individual numerical values within that range. For example, description of a range such as from 1 to 6 should be considered to have specifically disclosed sub-ranges such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as individual numbers within that range, for example, 1, 2, 3, 4, 5, and 6. This applies regardless of the breadth of the range.
The practice of the invention may employ, unless otherwise indicated, conventional techniques and descriptions of organic chemistry, polymer technology, molecular biology (including recombinant techniques), cell biology, biochemistry, and immunology, which are within the skill of one of skill in the art. Such conventional techniques include polymer array synthesis, hybridization, ligation, and detection of hybridization using a detectable label. Specific illustrations of suitable techniques are provided by reference to the examples hereinbelow. However, other equivalent conventional procedures may also be employed. Such conventional techniques and descriptions may be found in standard laboratory manuals, such as Genome Analysis: A Laboratory Manual Series (Vols. I-IV), Using Antibodies: A Laboratory Manual, Cells: A Laboratory Manual, PCR Primer: A Laboratory Manual, and Molecular Cloning: A Laboratory Manual (all from Cold Spring Harbor Laboratory Press), Stryer, L. (1995), Biochemistry, 4th Ed., Freeman, New York, Gait, Oligonucleotide Synthesis: A Practical Approach, (1984), IRL Press, London, Nelson and Cox (2000), Lehninger, Principles of Biochemistry, 3rd Ed., W.H. Freeman Pub., New York, N.Y., and Berg et al. (2002), Biochemistry, 5th Ed., W.H. Freeman Pub., New York, N.Y., all of which are herein incorporated in their entirety by reference for all purposes.
The invention may employ solid substrates, including arrays in some embodiments. Methods and techniques applicable to polymer (including protein) array synthesis have been described in U.S. Ser. No. 09/536,841 (abandoned), WO 00/58516, U.S. Pat. Nos. 5,143,854, 5,242,974, 5,252,743, 5,324,633, 5,384,261, 5,405,783, 5,424,186, 5,451,683, 5,482,867, 5,491,074, 5,527,681, 5,550,215, 5,571,639, 5,578,832, 5,593,839, 5,599,695, 5,624,711, 5,631,734, 5,795,716, 5,831,070, 5,837,832, 5,856,101, 5,858,659, 5,936,324, 5,968,740, 5,974,164, 5,981,185, 5,981,956, 6,025,601, 6,033,860, 6,040,193, 6,090,555, 6,136,269, 6,269,846 and 6,428,752, and in PCT Applications Nos. PCT/US99/00730 (International Publication No. WO 99/36760) and PCT/US01/04285 (International Publication No. WO 01/58593), which are all incorporated herein by reference in their entirety for all purposes.
Patents that describe synthesis techniques in specific embodiments include U.S. Pat. Nos. 5,412,087, 6,147,205, 6,262,216, 6,310,189, 5,889,165, and 5,959,098. Nucleic acid arrays are described in many of the above patents, but the same techniques are applied to polypeptide arrays.
Nucleic acid arrays that are useful in the invention include, but are not limited to, those that are commercially available from Affymetrix (Santa Clara, Calif.) under the brand name GeneChip®. Example arrays are shown on the website at Affymetrix.com.
The invention contemplates many uses for polymers attached to solid substrates. These uses include, but are not limited to, gene expression monitoring, profiling, library screening, genotyping and diagnostics. Methods of gene expression monitoring and profiling are described in U.S. Pat. Nos. 5,800,992, 6,013,449, 6,020,135, 6,033,860, 6,040,138, 6,177,248 and 6,309,822. Genotyping methods, and uses thereof, are disclosed in U.S. patent application Ser. No. 10/442,021 (abandoned) and U.S. Pat. Nos. 5,856,092, 6,300,063, 5,858,659, 6,284,460, 6,361,947, 6,368,799, 6,333,179, and 6,872,529. Other uses are described in U.S. Pat. Nos. 5,871,928, 5,902,723, 6,045,996, 5,541,061, and 6,197,506.
The invention also contemplates sample preparation methods in certain embodiments. Prior to, or concurrent with, genotyping, the genomic sample may be amplified by a variety of mechanisms, some of which may employ PCR. (See, for example, PCR Technology: Principles and Applications for DNA Amplification, Ed. H. A. Erlich, Freeman Press, NY, N.Y., 1992; PCR Protocols: A Guide to Methods and Applications, Eds. Innis, et al., Academic Press, San Diego, Calif., 1990; Mattila et al., Nucleic Acids Res., 19:4967, 1991; Eckert et al., PCR Methods and Applications, 1:17, 1991; PCR, Eds. McPherson et al., IRL Press, Oxford, 1991; and U.S. Pat. Nos. 4,683,202, 4,683,195, 4,800,159 4,965,188, and 5,333,675, each of which is incorporated herein by reference in their entireties for all purposes. The sample may also be amplified on the array. (See, for example, U.S. Pat. No. 6,300,070 and U.S. patent application Ser. No. 09/513,300 (abandoned), all of which are incorporated herein by reference).
Other suitable amplification methods include the ligase chain reaction (LCR) (see, for example, Wu and Wallace, Genomics, 4:560 (1989), Landegren et al., Science, 241:1077 (1988) and Barringer et al., Gene, 89:117 (1990)), transcription amplification (Kwoh et al., Proc. Natl. Acad. Sci. USA, 86:1173 (1989) and WO 88/10315), self-sustained sequence replication (Guatelli et al., Proc. Nat. Acad. Sci. USA, 87:1874 (1990) and WO 90/06995), selective amplification of target polynucleotide sequences (U.S. Pat. No. 6,410,276), consensus sequence primed polymerase chain reaction (CP-PCR) (U.S. Pat. No. 4,437,975), arbitrarily primed polymerase chain reaction (AP-PCR) (U.S. Pat. Nos. 5, 413,909 and 5,861,245) and nucleic acid based sequence amplification (NABSA). (See also, U.S. Pat. Nos. 5,409,818, 5,554,517, and 6,063,603, each of which is incorporated herein by reference). Other amplification methods that may be used are described in, for instance, U.S. Pat. Nos. 6,582,938, 5,242,794, 5,494,810, and 4,988,617, each of which is incorporated herein by reference.
Additional methods of sample preparation and techniques for reducing the complexity of a nucleic sample are described in Dong et al., Genome Research, 11:1418 (2001), U.S. Pat. Nos. 6,361,947, 6,391,592, 6,632,611, 6,872,529 and 6,958,225, and in U.S. patent application Ser. No. 09/916,135 (abandoned).
Methods for conducting polynucleotide hybridization assays have been well developed in the art. Hybridization assay procedures and conditions will vary depending on the application and are selected in accordance with known general binding methods, including those referred to in Maniatis et al., Molecular Cloning: A Laboratory Manual, 2nd Ed., Cold Spring Harbor, N.Y., (1989); Berger and Kimmel, Methods in Enzymology, Guide to Molecular Cloning Techniques, Vol. 152, Academic Press, Inc., San Diego, Calif. (1987); Young and Davism, Proc. Nat'l. Acad. Sci., 80:1194 (1983). Methods and apparatus for performing repeated and controlled hybridization reactions have been described in, for example, U.S. Pat. Nos. 5,871,928, 5,874,219, 6,045,996, 6,386,749, and 6,391,623 each of which are incorporated herein by reference.
The invention also contemplates signal detection of hybridization between ligands in certain embodiments. (See, U.S. Pat. Nos. 5,143,854, 5,578,832, 5,631,734, 5,834,758, 5,936,324, 5,981,956, 6,025,601, 6,141,096, 6,185,030, 6,201,639, 6,218,803, and 6,225,625, U.S. patent application Ser. No. 10/389,194 (U.S. Patent Application Publication No. 2004/0012676) and PCT Application PCT/US99/06097 (published as WO 99/47964), each of which is hereby incorporated by reference in its entirety for all purposes).
The practice of the invention may also employ conventional biology methods, software and systems. Computer software products of the invention typically include, for instance, computer readable medium having computer-executable instructions for performing the logic steps of the method of the invention. Suitable computer readable medium include, but are not limited to, a floppy disk, CD-ROM/DVD/DVD-ROM, hard-disk drive, flash memory, ROM/RAM, magnetic tapes, etc. The computer executable instructions may be written in a suitable computer language or combination of several computer languages. Basic computational biology methods which may be employed in the invention are described in, for example, Setubal and Meidanis et al., Introduction to Computational Biology Methods, PWS Publishing Company, Boston, (1997); Salzberg, Searles, Kasif, (Ed.), Computational Methods in Molecular Biology, Elsevier, Amsterdam, (1998); Rashidi and Buehler, Bioinformatics Basics: Application in Biological Science and Medicine, CRC Press, London, (2000); and Ouelette and Bzevanis Bioinformatics: A Practical Guide for Analysis of Gene and Proteins, Wiley & Sons, Inc., 2nd ed., (2001). (See also, U.S. Pat. No. 6,420,108).
The invention may also make use of various computer program products and software for a variety of purposes, such as probe design, management of data, analysis, and instrument operation. (See, U.S. Pat. Nos. 5,593,839, 5,795,716, 5,733,729, 5,974,164, 6,066,454, 6,090,555, 6,185,561, 6,188,783, 6,223,127, 6,229,911 and 6,308,170).
Additionally, the invention encompasses embodiments that may include methods for providing genetic information over networks such as the internet, as disclosed in, for instance, U.S. patent application Ser. Nos. 10/197,621 (U.S. Patent Application Publication No. 20030097222), 10/063,559 (U.S. Patent Application Publication No. 20020183936, abandoned), 10/065,856 (U.S. Patent Application Publication No. 20030100995, abandoned), 10/065,868 (U.S. Patent Application Publication No. 20030120432, abandoned), 10/328,818 (U.S. Patent Application Publication No. 20040002818, abandoned), 10/328,872 (U.S. Patent Application Publication No. 20040126840, abandoned), 10/423,403 (U.S. Patent Application Publication No. 20040049354, abandoned), and 60/482,389 (expired).
The term “array” as used herein refers to an intentionally created collection of molecules which can be prepared either synthetically or biosynthetically. The molecules in the array can be identical or different from each other. The array can assume a variety of formats, e.g., libraries of soluble molecules; libraries of compounds tethered to resin beads, silica chips, or other solid supports.
The term “biomonomer” as used herein refers to a single unit of biopolymer, which can be linked with the same or other biomonomers to form a biopolymer (for example, a single amino acid or nucleotide with two linking groups one or both of which may have removable protecting groups) or a single unit which is not part of a biopolymer. Thus, for example, a nucleotide is a biomonomer within an oligonucleotide biopolymer, and an amino acid is a biomonomer within a protein or peptide biopolymer; avidin, biotin, antibodies, antibody fragments, etc., for example, are also biomonomers.
The term “biopolymer” or “biological polymer” as used herein is intended to mean repeating units of biological or chemical moieties. Representative biopolymers include, but are not limited to, nucleic acids, oligonucleotides, amino acids, proteins, peptides, hormones, oligosaccharides, lipids, glycolipids, lipopolysaccharides, phospholipids, synthetic analogues of the foregoing, including, but not limited to, inverted nucleotides, peptide nucleic acids, Meta-DNA, and combinations of the above.
The term “biopolymer synthesis” as used herein is intended to encompass the synthetic production, both organic and inorganic, of a biopolymer. Related to a bioploymer is a “biomonomer”.
The term “complementary” as used herein refers to the hybridization or base pairing between nucleotides or nucleic acids, such as, for instance, between the two strands of a double stranded DNA molecule or between an oligonucleotide primer and a primer binding site on a single stranded nucleic acid to be sequenced or amplified. Complementary nucleotides are, generally, A and T (or A and U), or C and G. Two single stranded RNA or DNA molecules are said to be complementary when the nucleotides of one strand, optimally aligned and compared and with appropriate nucleotide insertions or deletions, pair with at least about 80% of the nucleotides of the other strand, usually at least about 90% to 95%, and more preferably from about 98 to 100%. Alternatively, complementarity exists when an RNA or DNA strand will hybridize under selective hybridization conditions to its complement. Typically, selective hybridization will occur when there is at least about 65% complementary over a stretch of at least 14 to 25 nucleotides, preferably at least about 75%, more preferably at least about 90% complementary. See, M. Kanehisa Nucleic Acids Res. 12:203 (1984), incorporated herein by reference.
The term “combinatorial synthesis strategy” as used herein refers to a combinatorial synthesis strategy is an ordered strategy for parallel synthesis of diverse polymer sequences by sequential addition of reagents which may be represented by a reactant matrix and a switch matrix, the product of which is a product matrix. A reactant matrix is a 1 column by m row matrix of the building blocks to be added. The switch matrix is all or a subset of the binary numbers, preferably ordered, between 1 and m arranged in columns. A “binary strategy” is one in which at least two successive steps illuminate a portion, often half, of a region of interest on the substrate. In a binary synthesis strategy, all possible compounds which can be formed from an ordered set of reactants are formed. In most preferred embodiments, binary synthesis refers to a synthesis strategy which also factors a previous addition step. For example, a strategy in which a switch matrix for a masking strategy halves regions that were previously illuminated, illuminating about half of the previously illuminated region and protecting the remaining half (while also protecting about half of previously protected regions and illuminating about half of previously protected regions). It will be recognized that binary rounds may be interspersed with non-binary rounds and that only a portion of a substrate may be subjected to a binary scheme. A combinatorial “masking” strategy is a synthesis which uses light or other spatially selective deprotecting or activating agents to remove protecting groups from materials for addition of other materials such as amino acids.
The term “complex population or mixed population” as used herein refers to any sample containing both desired and undesired nucleic acids. As a non-limiting example, a complex population of nucleic acids may be total genomic DNA, total genomic RNA or a combination thereof. Moreover, a complex population of nucleic acids may have been enriched for a given population but include other undesirable populations. For example, a complex population of nucleic acids may be a sample which has been enriched for desired messenger RNA (mRNA) sequences but still includes some undesired ribosomal RNA sequences (rRNA).
The term “effective amount” as used herein refers to an amount sufficient to induce a desired result.
The term “genome” as used herein is all the genetic material in the chromosomes of an organism. DNA derived from the genetic material in the chromosomes of a particular organism is genomic DNA. A genomic library is a collection of clones made from a set of randomly generated overlapping DNA fragments representing the entire genome of an organism.
The term “hybridization conditions” as used herein will typically include salt concentrations of less than about 1M, more usually less than about 500 mM and preferably less than about 200 mM. Hybridization temperatures can be as low as 5° C., but are typically greater than 22° C., more typically greater than about 30° C., and preferably in excess of about 37° C. Longer fragments may require higher hybridization temperatures for specific hybridization. As other factors may affect the stringency of hybridization, including base composition and length of the complementary strands, presence of organic solvents and extent of base mismatching, the combination of parameters is more important than the absolute measure of any one alone.
The term “hybridization” as used herein refers to the process in which two single-stranded polynucleotides bind non-covalently to form a stable double-stranded polynucleotide; triple-stranded hybridization is also theoretically possible. The resulting (usually) double-stranded polynucleotide is a “hybrid.” The proportion of the population of polynucleotides that forms stable hybrids is referred to herein as the “degree of hybridization.” Hybridizations are usually performed under stringent conditions, for example, at a salt concentration of no more than 1 M and a temperature of at least 25° C. For example, conditions of 5×SSPE (750 mM NaC1, 50 mM NaPhosphate, 5 mM EDTA, pH 7.4) and a temperature of 25-30° C. are suitable for allele-specific probe hybridizations. For stringent conditions, see, for example, Sambrook, Fritsche and Maniatis, “Molecular Cloning A laboratory Manual” 2nd Ed. Cold Spring Harbor Press (1989), which is hereby incorporated by reference in its entirety for all purposes above.
Hybridizations, e.g., allele-specific probe hybridizations, are generally performed under stringent conditions. For example, conditions where the salt concentration is no more than about 1 Molar (M) and a temperature of at least 25 degrees-Celsius (C), e.g., 750 mM NaCl, 50 mM Sodium Phosphate, 5 mM EDTA, pH 7.4 (5×SSPE) and a temperature of from about 25 to about 30° C.
The term “hybridization probes” as used herein are oligonucleotides capable of binding in a base-specific manner to a complementary strand of nucleic acid. Such probes include peptide nucleic acids, as described in Nielsen et al., Science, 254, 1497-1500 (1991), and other nucleic acid analogs and nucleic acid mimetics.
The term “hybridizing specifically to” as used herein refers to the binding, duplexing, or hybridizing of a molecule only to a particular nucleotide sequence or sequences under stringent conditions when that sequence is present in a complex mixture (e.g., total cellular) DNA or RNA.
The term “initiation biomonomer” or “initiator biomonomer” as used herein is meant to indicate the first biomonomer which is covalently attached via reactive nucleophiles to the surface of the polymer, or the first biomonomer which is attached to a linker or spacer arm attached to the polymer, the linker or spacer arm being attached to the polymer via reactive nucleophiles.
The term “isolated nucleic acid” as used herein mean an object species invention that is the predominant species present (i.e., on a molar basis it is more abundant than any other individual species in the composition). Preferably, an isolated nucleic acid comprises at least about 50, 80 or 90% (on a molar basis) of all macromolecular species present. Most preferably, the object species is purified to essential homogeneity (contaminant species cannot be detected in the composition by conventional detection methods).
The term “ligand” as used herein refers to a molecule that is recognized by a particular receptor. The agent bound by or reacting with a receptor is called a “ligand,” a term which is definitionally meaningful only in terms of its counterpart receptor. The term “ligand” does not imply any particular molecular size or other structural or compositional feature other than that the substance in question is capable of binding or otherwise interacting with the receptor. Also, a ligand may serve either as the natural ligand to which the receptor binds, or as a functional analogue that may act as an agonist or antagonist. Examples of ligands that can be investigated by this invention include, but are not restricted to, agonists and antagonists for cell membrane receptors, toxins and venoms, viral epitopes, hormones (e.g., opiates, steroids, etc.), hormone receptors, peptides, enzymes, enzyme substrates, substrate analogs, transition state analogs, cofactors, drugs, proteins, and antibodies.
The term “linkage disequilibrium or allelic association” as used herein refers to the preferential association of a particular allele or genetic marker with a specific allele, or genetic marker at a nearby chromosomal location more frequently than expected by chance for any particular allele frequency in the population. For example, if locus X has alleles a and b, which occur equally frequently, and linked locus Y has alleles c and d, which occur equally frequently, one would expect the combination ac to occur with a frequency of 0.25. If ac occurs more frequently, then alleles a and c are in linkage disequilibrium. Linkage disequilibrium may result from natural selection of certain combination of alleles or because an allele has been introduced into a population too recently to have reached equilibrium with linked alleles.
The term “mixed population” as used herein refers to a complex population.
The term “monomer” as used herein refers to any member of the set of molecules that can be joined together to form an oligomer or polymer. The set of monomers useful in the invention includes, but is not restricted to, for the example of (poly)peptide synthesis, the set of L-amino acids, D-amino acids, or synthetic amino acids. As used herein, “monomer” refers to any member of a basis set for synthesis of an oligomer. For example, dimers of L-amino acids form a basis set of 400 “monomers” for synthesis of polypeptides. Different basis sets of monomers may be used at successive steps in the synthesis of a polymer. The term “monomer” also refers to a chemical subunit that can be combined with a different chemical subunit to form a compound larger than either subunit alone.
The term “mRNA” or “mRNA transcripts” as used herein, include, but not limited to pre-mRNA transcript(s), transcript processing intermediates, mature mRNA(s) ready for translation and transcripts of the gene or genes, or nucleic acids derived from the mRNA transcript(s). Transcript processing may include splicing, editing and degradation. As used herein, a nucleic acid derived from an mRNA transcript refers to a nucleic acid for whose synthesis the mRNA transcript or a subsequence thereof has ultimately served as a template. Thus, a cDNA reverse transcribed from an mRNA, an RNA transcribed from that cDNA, a DNA amplified from the cDNA, an RNA transcribed from the amplified DNA, etc., are all derived from the mRNA transcript and detection of such derived products is indicative of the presence and/or abundance of the original transcript in a sample. Thus, mRNA derived samples include, but are not limited to, mRNA transcripts of the gene or genes, cDNA reverse transcribed from the mRNA, cRNA transcribed from the cDNA, DNA amplified from the genes, RNA transcribed from amplified DNA, and the like.
The term “nucleic acid library or array” as used herein refers to an intentionally created collection of nucleic acids which can be prepared either synthetically or biosynthetically and screened for biological activity in a variety of different formats (e.g., libraries of soluble molecules; and libraries of oligos tethered to resin beads, silica chips, or other solid supports). Additionally, the term “array” is meant to include those libraries of nucleic acids which can be prepared by spotting nucleic acids of essentially any length (e.g., from 1 to about 1000 nucleotide monomers in length) onto a substrate. The term “nucleic acid” as used herein refers to a polymeric form of nucleotides of any length, either ribonucleotides, deoxyribonucleotides or peptide nucleic acids (PNAs), that comprise purine and pyrimidine bases, or other natural, chemically or biochemically modified, non-natural, or derivatized nucleotide bases. The backbone of the polynucleotide can comprise sugars and phosphate groups, as may typically be found in RNA or DNA, or modified or substituted sugar or phosphate groups. A polynucleotide may comprise modified nucleotides, such as methylated nucleotides and nucleotide analogs. The sequence of nucleotides may be interrupted by non-nucleotide components. Thus the terms nucleoside, nucleotide, deoxynucleoside and deoxynucleotide generally include analogs such as those described herein. These analogs are those molecules having some structural features in common with a naturally occurring nucleoside or nucleotide such that when incorporated into a nucleic acid or oligonucleoside sequence, they allow hybridization with a naturally occurring nucleic acid sequence in solution. Typically, these analogs are derived from naturally occurring nucleosides and nucleotides by replacing and/or modifying the base, the ribose or the phosphodiester moiety. The changes can be tailor made to stabilize or destabilize hybrid formation or enhance the specificity of hybridization with a complementary nucleic acid sequence as desired.
The term “nucleic acids” as used herein may include any polymer or oligomer of pyrimidine and purine bases, preferably cytosine, thymine, and uracil, and adenine and guanine, respectively. See Albert L. Lehninger, Principles of Biochemistry, at 793-800 (Worth Pub. 1982). Indeed, the invention contemplates any deoxyribonucleotide, ribonucleotide or peptide nucleic acid component, and any chemical variants thereof, such as methylated, hydroxymethylated or glucosylated forms of these bases, and the like. The polymers or oligomers may be heterogeneous or homogeneous in composition, and may be isolated from naturally-occurring sources or may be artificially or synthetically produced. In addition, the nucleic acids may be DNA or RNA, or a mixture thereof, and may exist permanently or transitionally in single-stranded or double-stranded form, including homoduplex, heteroduplex, and hybrid states.
The term “oligonucleotide” or “polynucleotide” as used herein refers to a nucleic acid ranging from at least 2, preferable at least 8, and more preferably at least 20 nucleotides in length or a compound that specifically hybridizes to a polynucleotide. Polynucleotides of the invention include sequences of deoxyribonucleic acid (DNA) or ribonucleic acid (RNA) which may be isolated from natural sources, recombinantly produced or artificially synthesized and mimetics thereof. A further example of a polynucleotide of the invention may be peptide nucleic acid (PNA) of a locking nucleic acid (LNA). The invention also encompasses situations in which there is a nontraditional base pairing such as Hoogsteen base pairing which has been identified in certain tRNA molecules and postulated to exist in a triple helix. “Polynucleotide” and “oligonucleotide” are used interchangeably in this application.
The term “probe” as used herein refers to a surface-immobilized molecule that can be recognized by a particular target. See U.S. Pat. No. 6,582,908 for an example of arrays having all possible combinations of probes with 10, 12, and more bases. Examples of probes that can be investigated by this invention include, but are not restricted to, agonists and antagonists for cell membrane receptors, toxins and venoms, viral epitopes, hormones (e.g., opioid peptides, steroids, etc.), hormone receptors, peptides, enzymes, enzyme substrates, cofactors, drugs, lectins, sugars, oligonucleotides, nucleic acids, oligosaccharides, proteins, and monoclonal antibodies.
The term “primer” as used herein refers to a single-stranded oligonucleotide capable of acting as a point of initiation for template-directed DNA synthesis under suitable conditions e.g., buffer and temperature, in the presence of four different nucleoside triphosphates and an agent for polymerization, such as, for example, DNA or RNA polymerase or reverse transcriptase. The length of the primer, in any given case, depends on, for example, the intended use of the primer, and generally ranges from 15 to 30 nucleotides. Short primer molecules generally require cooler temperatures to form sufficiently stable hybrid complexes with the template. A primer need not reflect the exact sequence of the template but must be sufficiently complementary to hybridize with such template. The primer site is the area of the template to which a primer hybridizes. The primer pair is a set of primers including a 5′ upstream primer that hybridizes with the 5′ end of the sequence to be amplified and a 3′ downstream primer that hybridizes with the complement of the 3′ end of the sequence to be amplified.
The term “polymorphism” as used herein refers to the occurrence of two or more genetically determined alternative sequences or alleles in a population. A polymorphic marker or site is the locus at which divergence occurs. Preferred markers have at least two alleles, each occurring at frequency of greater than 1%, and more preferably greater than 10% or 20% of a selected population. A polymorphism may comprise one or more base changes, an insertion, a repeat, or a deletion. A polymorphic locus may be as small as one base pair. Polymorphic markers include restriction fragment length polymorphisms, variable number of tandem repeats (VNTR's), hypervariable regions, minisatellites, dinucleotide repeats, trinucleotide repeats, tetranucleotide repeats, simple sequence repeats, and insertion elements such as Alu. The first identified allelic form is arbitrarily designated as the reference form and other allelic forms are designated as alternative or variant alleles. The allelic form occurring most frequently in a selected population is sometimes referred to as the wildtype form. Diploid organisms may be homozygous or heterozygous for allelic forms. A diallelic polymorphism has two forms. A triallelic polymorphism has three forms. Single nucleotide polymorphisms (SNPs) are included in polymorphisms.
The term “receptor” as used herein refers to a molecule that has an affinity for a given ligand. Receptors may be naturally-occurring or manmade molecules. Also, they can be employed in their unaltered state or as aggregates with other species. Receptors may be attached, covalently or noncovalently, to a binding member, either directly or via a specific binding substance. Examples of receptors which can be employed by this invention include, but are not restricted to, antibodies, cell membrane receptors, monoclonal antibodies and antisera reactive with specific antigenic determinants (such as on viruses, cells or other materials), drugs, polynucleotides, nucleic acids, peptides, cofactors, lectins, sugars, polysaccharides, cells, cellular membranes, and organelles. Receptors are sometimes referred to in the art as anti-ligands. As the term receptors is used herein, no difference in meaning is intended. A “Ligand Receptor Pair” is formed when two macromolecules have combined through molecular recognition to form a complex. Other examples of receptors which can be investigated by this invention include but are not restricted to those molecules shown in U.S. Pat. No. 5,143,854, which is hereby incorporated by reference in its entirety.
The term “solid support”, “support”, and “substrate” as used herein are used interchangeably and refer to a material or group of materials having a rigid or semi-rigid surface or surfaces. In many embodiments, at least one surface of the solid support will be substantially flat, although in some embodiments it may be desirable to physically separate synthesis regions for different compounds with, for example, wells, raised regions, pins, etched trenches, or the like. According to other embodiments, the solid support(s) will take the form of beads, resins, gels, microspheres, or other geometric configurations. See U.S. Pat. No. 5,744,305 for exemplary substrates.
The term “target” as used herein refers to a molecule that has an affinity for a given probe. Targets may be naturally-occurring or man-made molecules. Also, they can be employed in their unaltered state or as aggregates with other species. Targets may be attached, covalently or noncovalently, to a binding member, either directly or via a specific binding substance. Examples of targets which can be employed by this invention include, but are not restricted to, antibodies, cell membrane receptors, monoclonal antibodies and antisera reactive with specific antigenic determinants (such as on viruses, cells or other materials), drugs, oligonucleotides, nucleic acids, peptides, cofactors, lectins, sugars, polysaccharides, cells, cellular membranes, and organelles. Targets are sometimes referred to in the art as anti-probes. As the term target is used herein, no difference in meaning is intended. A “Probe Target Pair” is formed when two macromolecules have combined through molecular recognition to form a complex.
Embodiments of devices, methods and systems to ensure proper orientation and installation of trays for processing nucleic acid arrays are described herein. In a preferred embodiment of the invention an automated and flexible liquid handling system for processing nucleic acid arrays is provided. The system comprises a computer system for processing and acquiring data from the nucleic acid arrays and a deck. The deck is made up of stations, wherein each station holds a tray for a different process. Each station is labeled with a different first orientation marking to indicate a specific process. A corresponding second orientation marking is on the labeled tray. A user places the tray on the deck by matching the first orientation marking on the tray to the second orientation marking on the station. The orientation markings are to ensure that each labeled tray properly placed in a specific orientation and location.
Additional embodiments of consumable elements for use with fluid processing and scanning systems are also described herein that are enabled to process and acquires images comprising features of a probe array that may include feature sizes in a range of 24 μm, 5 μm, 4 μL, 1 μm. Efficient processing is performed in the presently described embodiments by consumable elements and instrumentation enabled to provide user 101 with “walk-away” freedom virtually eliminating the need for intervention between processing steps, and conservation of reagent usage to reduction of experimental costs.
Probe Array 140: An illustrative example of probe array 140 is provided in
For example,
Computer 150: An illustrative example of computer 150 is provided in
It will be understood by those of ordinary skill in the relevant art that there are many possible configurations of the components of computer 150 and that some components that may typically be included in computer 150 are not shown, such as cache memory, a data backup unit, and many other devices. Processor 255 may be a commercially available processor such as an ITANIUM® or PENTIUM® processor made by Intel Corporation, a SPARC® processor made by Sun Microsystems, an ATHALON™ or OPTERON™ processor made by AMD corporation, or it may be one of other processors that are or will become available. Some embodiments of processor 255 may also include what are referred to as Multi-core processors and/or be enabled to employ parallel processing technology in a single or multi-core configuration. For example, a multi-core architecture typically comprises two or more processor “execution cores”. In the present example each execution core may perform as an independent processor that enables parallel execution of multiple threads. In addition, those of ordinary skill in the related art will appreciate that processor 255 may be configured in what is generally referred to as 32 or 64 bit architectures, or other architectural configurations now known or that may be developed in the future.
Processor 255 executes operating system 260, which may be, for example, a WINDOWS®-type operating system (such as WINDOWS® XP) from the Microsoft Corporation; the Mac OS X operating system from Apple Computer Corp. (such as 7.5 Mac OS X v10.4 “Tiger” or 7.6 Mac OS X v10.5 “Leopard” operating systems); a UNIX® or Linux-type operating system available from many vendors or what is referred to as an open source, another or a future operating system, or some combination thereof. Operating system 260 interfaces with firmware and hardware in a well-known manner, and facilitates processor 255 in coordinating and executing the functions of various computer programs that may be written in a variety of programming languages. Operating system 260, typically in cooperation with processor 255, coordinates and executes functions of the other components of computer 150. Operating system 260 also provides scheduling, input-output control, file and data management, memory management, and communication control and related services, all in accordance with known techniques.
System memory 270 may be any of a variety of known or future memory storage devices. Examples include but are not limited to any commonly available random access memory (RAM), magnetic medium such as a resident hard disk or tape, an optical medium such as a read and write compact disc, or other memory storage device. Memory storage devices 281 may be any of a variety of known or future devices, including but not limited to a compact disk drive, a tape drive, a removable hard disk drive, USB or flash drive, or a diskette drive. Such types of memory storage devices 281 typically read from, and/or write to, a program storage medium (not shown) such as, respectively, a compact disk, magnetic tape, removable hard disk, USB or flash drive, or floppy diskette. Any of these program storage media, or others now in use or that may later be developed, may be considered a computer program product. As will be appreciated, these program storage media typically store a computer software program and/or data. Computer software programs, also called computer control logic, typically are stored in system memory 270 and/or the program storage device used in conjunction with memory storage device 281.
In some embodiments, a computer program product is employed comprising a computer usable medium having control logic (computer software program, including program code) stored therein. The control logic, when executed by processor 255, causes processor 255 to perform functions described herein. In other embodiments, some functions are implemented primarily in hardware using, for example, a hardware state machine. Implementation of the hardware state machine so as to perform the functions described herein will be apparent to those skilled in the relevant arts.
Input-output controllers 275 could include any of a variety of known devices for accepting and processing information from a user, whether a human or a machine, whether local or remote. Such devices include, for example, modem cards, wireless cards, network interface cards, sound cards, or other types of controllers for any of a variety of known input devices. Output controllers of input-output controllers 275 could include controllers for any of a variety of known display devices for presenting information to a user, whether a human or a machine, whether local or remote. In the illustrated embodiment, the functional elements of computer 150 communicate with each other via system bus 290. Some of these communications may be accomplished in alternative embodiments using network or other types of remote communications.
As will be evident to those skilled in the relevant art, an instrument control and image processing application, such as for instance an implementation of instrument control and image processing applications 272 illustrated in
Network 125 may include one or more of the many various types of networks well known to those of ordinary skill in the art. For example, network 125 may include a local or wide area network that employs what is commonly referred to as a TCP/IP protocol suite to communicate, that may include a network comprising a worldwide system of interconnected computer networks that is commonly referred to as the internet, and/or may optionally include various intranet architectures. Those of ordinary skill in the related arts will also appreciate that some users in networked environments may prefer to employ what are generally referred to as “firewalls” (also sometimes referred to as Packet Filters, or Border Protection Devices) to control information traffic to and from hardware and/or software systems. For example, firewalls may comprise hardware or software elements or some combination thereof and are typically designed to enforce security policies put in place by users, such as for instance network administrators, etc.
Instrument control and image processing applications 272: Instrument control and image processing applications 272 may comprise any of a variety of known or future image processing applications. Some examples of known instrument control and image processing applications include the Affymetrix Microarray Suite, and Affymetrix GENECHIP® Operating Software (hereafter referred to as GCOS) applications. Typically, embodiments of applications 272 may be loaded into system memory 270 and/or memory storage device 281.
Those of ordinary skill in the related art will appreciate that applications 272 may be stored for execution on any compatible computer system, such as computer 150. For example, the described embodiments of applications 272 may, for example, include the Affymetrix Command-Console™ software. Embodiments of applications 272 may advantageously provide what is referred to as a modular interface for one or more computers or workstations and one or more servers, as well as one or more instruments. The term “modular” as used herein generally refers to elements that may be integrated to and interact with a core element in order to provide a flexible, updateable, and customizable platform. For example, as will be described in greater detail below applications 272 may comprise a “core” software element enabled to communicate and perform primary functions necessary for any instrument control and image processing application. Such primary functionality may include communication over various network architectures, or data processing functions such as processing raw intensity data into a .dat file. In the present example, modular software elements, for instance what may be referred to as a plug-in module, may be interfaced with the core software element to perform more specific or secondary functions, such as, for instance, functions that are specific to particular instruments. In particular, the specific or secondary functions may include functions customizable for particular applications desired by user 101. Further, integrated modules and the core software element are considered to be a single software application, and referred to as applications 272.
In the presently described implementation, applications 272 may communicate with, and receive instruction or information from, or control one or more elements or processes of one or more servers, one or more workstations, and one or more instruments. Also, embodiments of server or computer 150 with an implementation of applications 272 stored thereon could be located locally or remotely and communicate with one or more additional servers and/or one or more other computers/workstations or instruments.
In some embodiments, applications 272 may be capable of data encryption/decryption functionality. For example, it may be desirable to encrypt data, files, information associated with GUI's 246, or other information that may be transferred over network 125 to one or more remote computers or servers for data security and confidentiality purposes. For example, some embodiments of probe array 140 may be employed for diagnostic purposes where the data may be associated with a patient and/or a diagnosis of a disease or medical condition. It is desirable in many applications to protect the data using encryption for confidentiality of patient information. In addition, one-way encryption technologies may be employed in situations where access should be limited to only select parties such as a patient and their physician. In the present example, only the selected parties have the key to decrypt or associate the data with the patient. In some applications, the one-way encrypted data may be stored in one or more public databases or repositories where even the curator of the database or repository would be unable to associate the data with the user or otherwise decrypt the information. The described encryption functionality may also have utility in clinical trial applications where it may be desirable to isolate one or more data elements from each other for the purpose of confidentiality and/or removal of experimental biases.
Various embodiments of applications 272 may provide one or more interactive graphical user interfaces that allows user 101 to make selections based upon information presented in an embodiment of GUI 246. Those of ordinary skill will recognize that embodiments of GUI 246 may be coded in various language formats such as an HTML, XHTML, XML, javascript, Jscript, or other language known to those of ordinary skill in the art used for the creation or enhancement of “Web Pages” viewable and compatible with internet client 279. For example, internet client 279 may include various internet browsers such as Microsoft Internet Explorer, Netscape Navigator, Mozilla Firefox, Apple Safari, or other browsers known in the art. Applications of GUI's 246 viewable via one or more browsers may allow user 101 complete remote access to data, management, and registration functions without any other specialized software elements. Applications 272 may provide one or more implementations of interactive GUI's 246 that allow user 101 to select from a variety of options including data selection, experiment parameters, calibration values, and probe array information within the access to data, management, and registration functions.
In some embodiments, applications 272 may be capable of running on operating systems in a non-English format, where applications 272 can accept input from user 101 in various non-English language formats such as, but not limited to, Chinese, French, Spanish etc., and output information to user 101 in the same or other desired language output. For example, applications 272 may present information to user 101 in various implementations of GUI 246 in a language output desired by user 101, and similarly receive input from user 101 in the desired language. In the present example, applications 272 is internationalized such that it is capable of interpreting the input from user 101 in the desired language where the input is acceptable input with respect to the functions and capabilities of applications 272.
Embodiments of applications 272 also include instrument control features, where the control functions of individual types or specific instruments such as, but not limited to, scanner 100, an autoloader, or fluid handling system may be organized as plug-in type modules to applications 272. For example, each plug-in module may be a separate component and may provide definition of the instrument control features to applications 272. As described above, each plug-in module is functionally integrated with applications 272 when stored in system memory 270 and thus reference to applications 272 includes any integrated plug-in modules. In the present example, each instrument may have one or more associated embodiments of plug-in modules that may be specific to the model of instrument, revision of instrument firmware or scripts, number and/or configuration of instrument embodiment, etc. Further, multiple embodiments of plug-in module for the same instrument, such as scanner 100, may be stored in system memory 270 for use by applications 272, where user 101 may select the desired embodiment of the module to employ, or alternatively such a selection of modules may be defined by data encoded directly in a machine readable identifier or indirectly via the array file, library files, experiments files and so on.
The instrument control features may include the control of one or more elements of one or more instruments that could, for instance, include elements of a hybridization device, fluid processing instrument 105, autoloader, or scanner 100. The instrument control features may also be capable of receiving information from the one more instruments that could include experiment or instrument status, process steps, or other relevant information. The instrument control features could, for example, be under the control of an element of the interface of applications 272. In some embodiments, a user may input desired control commands and/or receive the instrument control information via one of GUI's 246. Additional examples of instrument control via a GUI or other interface as contemplated herein, is provided in United States Patent Publication No. 2004-0220897, titled “System, Method and Computer Software Product for Instrument Control, Data Acquisition, Analysis, Management and Storage”, filed Jan. 26, 2004, which is hereby incorporated by reference herein in its entirety for all purposes.
In some embodiments, applications 272 may employ what may be referred to as an “array file” that comprises data employed by various instruments, processing functions of images by applications 272, or other relevant information. Generally it is desirable to consolidate elements of data or metadata related to an embodiment of probe array 140, experiment, user, or some combination thereof, to a single file that is not duplicated (i.e. as embodiments of .dat files may be in certain applications), where duplication may sometimes be a source of error. The term “metadata” as used herein generally refers to data about data. It may also be desirable in some embodiments to restrict or prohibit the ability to overwrite data in the array file. Preferentially, new information may be appended to the array file rather than deleting or overwriting information, providing the benefit of traceability and data integrity (i.e. as may be required by some regulatory agencies). For example, an array file may be associated with one or more implementations of an embodiment of probe array 140, where the array file acts to unify data across a set of probe arrays 140. The array file may be created by applications 272 via a registration process, where user 101 inputs data into applications 272 via one or more of GUI's 246. In the present example, the array file may be associated by user 101 with a custom identifier that could include a machine readable identifier such as the machine readable identifiers described in greater detail below. Alternatively, applications 272 may create an array file and automatically associate the array file with a machine readable identifier that identifies an embodiment of probe array 140 (i.e. relationship between the machine readable identifier and probe array 140 may be assigned by a manufacturer). Applications 272 may employ various data elements for the creation or update of the array file from one or more library files, such as library files 274 or other library files.
Alternatively, the array file may comprise pointers to one or more additional data files comprising data related to an associated embodiment of probe array 140. For example, the manufacturer of probe array 140 or other user may provide library files 274 or other files that define characteristics such as probe identity, dimension and positional location, for example, with respect to some fiducial reference or coordinate system, of the active area of probe array 140, various experimental parameters, instrument control parameters, or other types of useful information. In addition, the array file may also contain one or more metadata elements that could include one or more of a unique identifier for the array file, human readable form of a machine readable identifier, or other metadata elements. In addition, applications 272 may store data, i.e. as metadata, or stored data, that includes sample identifiers, array names, user parameters, event logs that may for instance include a value identifying the number of times an array has been scanned, relationship histories such as the relationship between each .cel file and the one or more .dat files that were employed to generate the .cel file, and other types of data useful in for processing and data management.
For example, user 101 and/or automated data input devices or programs (not shown) may provide data related to the design or manner in which conduct of experiments are to be conducted. User 101 may specify an Affymetrix catalogue or custom chip type (e.g., Human Genome U133 plus 2.0 chip) either by selecting from a predetermined list presented in one or more of GUI's 246 or by scanning a bar code, Radio Frequency Identification (RFID), magnetic strip, or other means of electronic identification related to probe array 140 to read its type, part no., array identifier, etc. Applications 272 may associate the chip type, part no., array identifier with various scanning parameters stored in data tables or library files, such as library files 274 of computer 150, including the area of probe array 140 that is to be scanned, the location of chrome elements or other features on probe array 140 used for auto-focusing, the wavelength or intensity/power of excitation light to be used in reading the chip, and the like. Also, some embodiments of applications 272 may encode array files in a binary type format that may minimize the possibility of data corruption. However, applications 272 may be further enabled to export an array file in a number of different formats.
Also continuing the example above, some embodiments of RFID tags associated with embodiments of probe array 140 may be capable of “data logging” functionality where, for instance, each RFID tag or label may actively measure and record parameters of interest. In the present example, such parameters of interest may include environmental conditions such as temperature and/or humidity that the implementation of probe array 140 may have been exposed to. In the present example, user 101 may be interested in the environmental conditions because the biological integrity of some embodiments of probe array 140 may be affected by exposure to fluctuations of the environment. In some embodiments, applications 272 may extract the recorded environmental information from the RFID tag or label and store it in the array file, or some other file that has a pointer to or from the array file. In the same or alternative embodiments, applications 272 may monitor the environmental conditions exposed to the probe array in real time, where applications 272 may regularly monitor information provided by one or more RFID tags simultaneously. Applications 272 may further analyze and employ such information for quality control purposes, for data normalization, or other purposes known in the related art. Some examples of RFID embodiments capable of recording environmental parameters include the THERMASSURERF™ RFID sensor available from Evidencia LLP of Memphis Tenn., or the Tempsens™ RFID datalogging label available from Exago Pty Ltd. of Australia.
Also, in the same or alternative embodiments, applications 272 may generate or access what may be referred to as a “plate” file. The plate file may encode one or more data elements such as pointers to one or more array files, and preferably may include pointers to a plurality of array files.
In some embodiments, raw image data is acquired from scanner 100 and operated upon by applications 272 to generate intermediate results. For example, raw intensity data acquired from scanner 100 may be directed to a .dat file generator and written to data files (*.dat) that comprises an intensity value for each pixel of data acquired from a scan of an embodiment of probe array 140. In the same or alternative embodiments it may be advantageous to scan sub areas (that may be referred to as sub arrays) of probe array 140 where the detected signal for each sub area scanned may be written to an individual embodiment of a .dat file. Continuing with the present example, applications 272 may also encode a unique identifier for each .dat file as well as a pointer to an associated embodiment of an array file as metadata into each .dat file generated. The term “pointer” as used herein generally refers to a programming language datatype, variable, or data object that references another data object, datatype, variable, etc. using a memory address or identifier of the referenced element in a memory storage device such as in system memory 270. In some embodiments the pointers comprise the unique identifiers of the files that are the subject of the pointing, for example, the pointer in a .dat file may comprise the unique identifier of the array file. Additional examples of the generation and image processing of sub arrays is described in U.S. Patent Publication No. 2006-0184038 A1, titled “System, Method, and Product for Analyzing Images Comprising Small Feature Sizes”, filed Nov. 30, 2005, which is hereby incorporated by reference herein in its entirety for all purpose.
Also, applications 272 may include a .cel file generator that may produce one or more .cel files (*.cel) by processing each .dat file. Alternatively, some embodiments of the .cel file generator may produce a single .cel file from processing multiple .dat files such as with the example of processing multiple sub-arrays described above. Similar to the .dat file described above, each embodiment of .cel file may also include one or more metadata elements. For example, applications 272 may encode a unique identifier for each .cel file as well as a pointer to an associated array file and/or the one or more .dat files used to produce the .cel file.
For each probe feature scanned by scanner 100, each .cel file contains a single value representative of the intensities of pixels measured by scanner 100 for that probe. For example, this value may include a measure of the abundance of tagged mRNA's present in the target that hybridized to the corresponding probe. Many such mRNA's may be present in each probe, as a probe on a GENECHIP® probe array may include, for example, millions of oligonucleotides designed to detect the mRNA's. Alternatively, the value may include a measure related to the sequence composition of DNA or other nucleic acid detected by the probes of a GENECHIP® probe array. As described above, applications 272 receives image data derived from probe array 140 using scanner 100 and generates a .dat file that is then processed by applications 272 to produce a .cel intensity file, where applications 272 may utilize information from an array file in the image processing function. For instance, the .cel file generator may perform what is referred to as grid placement methods on the image data in each .dat file, using data elements such as dimension information to determine and define the positional location of probe features in the image. Typically, the .cel file generator associates what may be referred to as a grid with the image data in a .dat file for the purpose of determining the positional relationship of probe features in the image with the known positions and identities of the probe features. The accurate registration of the grid with the image is important for the accuracy of the information in the resulting .cel file. Also, some embodiments of .cel file generators may provide user 101 with a graphical representation of a grid aligned to image data from a selected .dat file in an implementation of GUI 246, and further enable user 101 to manually refine the position of the grid placement using methods commonly employed, such as placing a cursor over the grid, selecting such as by holding down a button on a mouse, and dragging the grid to a preferred positional relationship with the image. Applications 272 may then perform methods sometimes referred to as “feature extraction” to assign a value of intensity for each probe represented in the image as an area defined by the boundary lines of the grid. Examples of grid registration, methods of positional refinement, and feature extraction are described in U.S. Pat. Nos. 6,090,555, 6,611,767, 6,829,376, and U.S. Patent Publication Nos. 2004-0006431 A1, and 2003-0038812 A1, each of which is hereby incorporated by reference herein in its entirety for all purposes.
As noted, another file that may be generated by applications 272 is a .chp file using a .chp file generator. For example, each .chp file is derived from analysis of a .cel file combined in some cases with information derived from an array file, other lab data and/or library files 274 that specify details regarding the sequences and locations of probes and controls. In some embodiments, a machine readable identifier associated with probe array 140 may indicate the library file directly or indirectly via one or more identifiers in the array file, employed for identification of the probes and their positional locations. The resulting data stored in the .chp file includes degrees of hybridization, absolute and/or differential (over two or more experiments) expression, genotype comparisons, detection of polymorphisms and mutations, and other analytical results.
In some alternative embodiments, user 101 may prefer to employ different applications to process data such as an independent analysis application. Embodiments of an analysis application may comprise any of a variety of known or probe array analysis applications, and particularly analysis applications specialized for use with embodiments of probe array 140 designed for genotyping or expression applications. Various embodiments of analysis application may exist such as applications developed by the probe array manufacturer for specialized embodiments of probe array 140, commercial third party software applications, open source applications, or other applications known in the art for specific analysis of data from probe arrays 140. Some examples of known genotyping analysis applications include the Affymetrix GENECHIP® Data Analysis System (GDAS), Affymetrix GENECHIP® Genotyping Analysis Software (GTYPE), Affymetrix GENECHIP® Targeted Genotyping Analysis Software (GTGS), and Affymetrix GENECHIP® Sequence Analysis Software (GSEQ) applications. Additional examples of genotyping analysis applications may be found in U.S. Patent Publication Nos. 2004-0138821 A1; 2005-0123971 A1; and 2005-0287575 A1; each of which is hereby incorporated by reference herein in its entirety for all purposes. Typically, embodiments of analysis applications may be loaded into system memory 270 and/or memory storage device 281 through one of input-output devices 240.
Some embodiments of analysis applications include executable code being stored in system memory 270. Applications 272 may be enabled to export .cel files, .dat files, or other files to an analysis application or enable access to such files on computer 150 by the analysis application. Import and/or export functionality for compatibility with specific systems or applications may be enabled by one or more integrated modules as described above with respect to plug-in modules. For example, an analysis application may be capable of performing specialized analysis of processed intensity data, such as the data in a .cel file. In the present example, user 101 may desire to process data associated with a plurality of implementations of probe array 140 and therefore the analysis application would receive a .cel file associated with each probe array for processing. In the present example, applications 272 forward the appropriate files in response to queries or requests from the analysis application.
In the same or alternative examples, user 101 and/or the third party developers may employ what are referred to as software development kits that enable programmatic access into file formats, or the structure of applications 272. Therefore, developers of other software applications such as the described analysis application may integrate with and seamlessly add functionally to or utilize data from applications 272 that provides user 101 with a wide range of application and processing capability. Additional examples of software development kits associated with software or data related to probe arrays are described in U.S. Pat. No. 6,954,699, and U.S. Application Serial Nos. 2004-0220897A1 and 2006-0074563 A1, each of which is hereby incorporated by reference herein in its entirety for all purposes.
Additional examples of .cel and .chp files are described with respect to the Affymetrix GENECHIP® Operating Software or Affymetrix Microarray Suite (as described, for example, in U.S. Patent Application, Serial Nos. 2003-0036087, and 2004-0220897 A1, both of which are hereby incorporated herein by reference in their entireties for all purposes). For convenience, the term “file” often is used herein to refer to data generated or used by applications 272 and executable counterparts of other applications such as analysis application 380, where the data is written according a format such as the described .dat, .cel, and .chp formats. Further, the data files may also be used as input for applications 272 or other software capable of reading the format of the file.
Those of ordinary skill in the related art will appreciate that one or more operations of applications 272 may be performed by software or firmware associated with various instruments. For example, scanner 100 could include a computer that may include a firmware component that performs or controls one or more operations associated with scanner 100.
Yet another example of instrument control and image analysis applications is described in U.S. Patent Publication No. 2006-0241868 A1, titled “System, Method and Computer Product for Simplified Instrument Control and File Management”, filed Apr. 7, 2006, which is hereby incorporated by reference herein in its entirety for all purposes.
Scanner 100: Labeled targets hybridized to probe arrays may be detected using various devices, sometimes referred to as scanners, as described above with respect to methods and apparatus for signal detection.
An illustrative device is shown in
For example, scanner 100 provides a signal representing the intensities (and possibly other characteristics, such as color that may be associated with a detected wavelength) of the detected emissions or reflected wavelengths of light, as well as the locations on the substrate where the emissions or reflected wavelengths were detected. Typically, the signal includes intensity information corresponding to elemental sub-areas of the scanned substrate. The term “elemental” in this context means that the intensities, and/or other characteristics, of the emissions or reflected wavelengths from this area are each represented by a single value. When displayed as an image for viewing or processing, elemental picture elements, or pixels, often represent this information. Thus, in the present example, a pixel may have a single value representing the intensity of the elemental sub-area of the substrate from which the emissions or reflected wavelengths were scanned. The pixel may also have another value representing another characteristic, such as color, positive or negative image, or other type of image representation. The size of a pixel may vary in different embodiments and could include a 2.5 μm, 1.5 μm, 1.0 μm, or sub-micron pixel size. The signal may be incorporated into data such as data files in the form *.dat or *.tif as generated respectively by instrument control and image analysis applications 272 (described in greater detail above) that may include the Affymetrix Microarray Suite software (described in U.S. Patent Publication No. 2003-0036087, which is hereby incorporated by reference herein in its entirety for all purposes) or Affymetrix GENECHIP® Operating Software (described in U.S. Patent Application No. 2004-0220897, which is hereby incorporated by reference herein in its entirety for all purposes) based on images scanned from GENECHIP® arrays.
Embodiments of scanner 100 may employ various elements and optical architectures for detection. For instance, some embodiments of scanner 100 may employ what is referred to as a “confocal” type architecture that may include the use of photomultiplier tubes to as detection elements. Alternatively, some embodiments of scanner 100 may employ a CCD type (referred to as a Charge Coupled Device) architecture using what is referred to as a CCD or cooled CCD cameras as detection elements. Further examples of scanner systems that may be implemented with embodiments of the present invention include those disclosed in U.S. Patent Publication Nos. 2004-0012676 A1, 2005-0001176 A1, 2005-0059062 A1, and 2006-0094048 A1; each of which are incorporated by reference above; and U.S. Patent Publication No. 2006-0253035 A1, titled “Methods and Devices for Reading Microarrays”, filed Apr. 21, 2006, which is hereby incorporated by reference herein in its entirety for all purposes.
Fluid Processing Instrument 105: Processing embodiments of probe array 140 in preparation for scanning typically involves multiple steps that, when performed manually by user 101, consumes valuable time.
As shown in
In some embodiments, the gripper element 450 may also include a means of machine readable identification such as, for instance, a barcode reader or other machine readable means previously described. The machine readable means may read one or more machine readable identifiers associated with each of stations 220 and or trays for accurate identification and verification that the appropriate station is in its appropriate location and/or includes the appropriate fluid, reagents, etc. for the processing steps.
One alternative arrangement for the barcode reader could include mounting the barcode reader to the gripper element 450 and the associated support and movement hardware, just inside the front panel with the reader beam aimed through a window in the front panel. This arrangement allows the barcodes of items on the drawer to be read as the drawer is drawn back into the system. With the drawer fully retracted, the barcode reader can be used to manually scan items. One advantage of this arrangement is that a single barcode reader can be used to manually scan items for experiment setup as well as be used to verify proper loading of the drawer for the protocol being run. The alternative is to have multiple barcode readers, located, for example, internally and externally of the instrument.
Motor 410 or other elements may also enable manipulator 210 to move or translate along an axis relative to drawer 440. This may include an axis of movement that is substantially parallel to the primary axis of drawer 440 (X axis). Drawer 440 can be 12″ long or preferably 9″ long. The load drawer 440 is preferably driven by the same actuator that is used for moving the array peg strip 405 during fluidic processing. This eliminates the need for an additional actuator for the drawer.
Furthermore, manipulator 210 may be translated towards and away from the drawer, which may be referred to as the Z axis relative to drawer 440 (up and down). For example the Z axis motion of manipulator 210 may be employed to reversibly translate an embodiment of strip 405 toward one or more of stations 220 for processing. In the example, manipulator 210 may immerse probe array 140, extended from strip 405 via peg 605, in fluid associated implementations of stations 220 associated with the drawer 440 and/or repeatedly “dip” probe array 140 into the fluid in any of the wells found in drawer 440. After the processing steps associated with the drawer 440 have been completed, manipulator 210 retracts strip 405 away from the station for transport to another location or station. According to the same or another embodiment, motor 410 may provide the translation force to extend or retract the drawer 440. For example, some embodiments of fluid processing instrument 105 may include a door, aperture, or other means for allowing drawer 440 to extend from the instrument for the purpose of user interaction or intervention that may include loading trays of solution, buffer or other substance, into one or more positions associated with stations 220. Alternatively, drawer 440 may have a dedicated motor element to perform these tasks.
Mechanical automation platforms used in industrial laboratories require accurate relative position control between a gripper 450, pick-and-place or fluid handling head or gripper element 450 and the drawer 440 or the deck 500 of the automation system. Typically, the head-to-deck relative positions are calibrated to account for significant manufacturing variations in the system components. Once calibrated, the positioning system utilizes the stored calibrations to return to calibrated positions or to position new deck locations by interpolation or offset from calibrated positions. It is common for the calibration process to be performed using a mechanical alignment between the head and the table or by visual alignment between the head and the table. Once calibrated, the calibration values are fixed until the manual calibration process is repeated.
Typically, it is very important to know the exact position of drawer 440 or deck 500 when in the retracted position within instrument 105 in order to properly register the location of each of stations 220 for processing steps. For example, the exact position of each of stations 220 needs to be identified so that manipulator 210 can accurately align each probe array 140 with the appropriate chamber or well. Misalignment of the probe array/well relationship could result in substantial damage to probe array 140 such as by contact with partitions, walls, or other solid objects not intended to come into contact with probe array 140 possibly resulting in the complete loss of the probe array. Those of ordinary skill in the related art will appreciate that mechanical components such as those associated with drawer 440 are subject to mechanical fluctuation and differences due to environmental conditions and mechanical wear and thus the retracted position may vary. An example of compensating for positional variation includes a method of positional identification and associated method. In the example, drawer 440 may include a plurality of registration marks such as those typically used with what is referred to as a linear encoder. For instance, it may be desirable to associate registration marks in the X and Y axes of drawer 440, where the marks may include reflective elements or other optically identifiable marks. Instrument 105 may include an optical element, such as a linear encoder, that reads the registration marks associated with drawer 440 for position determination. Also in the present example, applications 272 may be employed for determining or calculating the position of drawer 440 that may be advantageous when, for instance, more complex interpolation calculations must be made to determine the position of drawer 440 within a measure of acceptable accuracy. Additionally, applications 272 may employ the determined position of drawer 440 to generate positional commands to direct the manipulator to the appropriate locations.
To improve positioning performance and reduce system and service costs, it is desirable to use a system that automatically, and during use, calibrates the relative position from the head or gripper element 450 to any number of table locations. The relative positioning performance over the life and wear of the system is maintained by the in-use calibration system. Calibration errors are reduced by eliminating the subjective nature of visual or mechanical calibration methods that depend on the skill of the technician. Calibration and setup costs are reduced by elimination of manual calibration methods. System costs are reduced by utilizing less expensive positioning components.
The head (gripper)-to-deck (drawer 440) relative positions of a robot platform may be accurately calibrated with a position sensing system that is integral to the head and is able to detect the deck. Considering that the position and orientation of a free body can be represented by three discrete points, the head-to-deck calibration may be accomplished by sensors which accurately detect the 3-dimensional location of three fiducials located on the deck. After detection of each of the three fiducial locations, all deck locations are known assuming accurate deck machining Additional fiducials can be incorporated into the deck at critical deck locations. Also, tools with integral fiducials may be periodically located at important deck locations and detected by the position sensors. Each calibrated deck location can be stored in non-volatile memory for subsequent repositioning. This approach allows the positioning system to take into account manufacturing variations as well as variations over the life of the system. Robot head orientation may also be detected and calibrated by incorporating multiple sensors into the head assembly. Assuming sufficient degrees of freedom of motion for the head, orientation positional errors, such as roll, pitch, yaw, can be corrected or adjusted for after detection of deck fiducials.
One preferred detector for a positioning system is a photoelectric slot sensor. These are commonly utilized to establish an absolute positional reference for robot systems. These sensors are inexpensive, are highly repeatable and are commercially available from companies such as Balluff, Datasensor, Optex, and Inprox, among others. Slot sensors generally detect objects that pass between two arms—one with the emitter, the other with the receiver. The fixed slot width provides reliable opposed-mode sensing of objects as small as 0.30 mm. A pair of photoelectric sensors placed orthogonal to each other may be used to detect the edges of a pin in each of the X, Y and Z directions, where the Z edge is detected by the same sensor as for X or Y.
According to an alternative embodiment of the invention, a deck 500 is provided to hold and locate the stations 220 on the fluid processing instrument 105 as shown in FIGS. 5 and 9A-9C. A deck 500, for example, as shown in
According to another embodiment of the invention, methods and techniques to assist in proper registration of the trays in the station on the deck have been provided. These methods include making sure that each of the trays are properly seated and positioned in the correct station on the deck during each process step. These methods assist in minimizing handling errors during the manual transfer of the trays from one location to another by providing the technician, for example, additional visual assistance in identifying the proper trays and stations. According to an embodiment, the trays can be color coded and the shape of the trays can be used to ensure that the correct tray is placed in the proper station on the deck.
According to another embodiment of the invention, matching orientation markings 921-926 are provided to improve the reliability of placing the correct trays into the correct orientation on the deck 500. The shape of an orientation marking can be, for example, rectangular, diamond, square, circular, oval, a letter, a number, a symbol, any modifications thereof, and so forth. The orientation markings can be of various colors, patterns, and coded in various colors and combinations thereof. The size of the orientation markings will be dependent on the space available for the orientation markings. Examples of matching orientation markings are shown in
To further improve the positioning performance of the array locations, the accuracy of the tray placement is improved according to another embodiment of the present invention by having the tray slide into position and then fixed into position by a latch 960. The latch 960 can be, for example, a metal, plastic, spring, rubber, or any modifications thereof, and so forth. A latch 960, as shown in
According to an alternative embodiment, methods and other techniques including locating springs 940 and other orientation features 941, as shown in
As shown in
A temperature sensor may be incorporated in the heat block to control the heater for the heat block. There may be a temperature difference between the heat block and the liquid in the wash tray 415. The liquid may be cooler due to heat loss to the room temperature (RT) air surrounding the wash tray. The heat block temperature may be set higher to make up for this difference. The amount it is set higher may be adjusted based on RT. A look up table may be programmed based on the measured RT and set point temperatures. A calibration may be performed on individual wash stations 305 to generate this look up table. The same tray may be used in other process steps. One example of the order of processing steps can be a prehybridization step, hybridization, Wash B, Wash A, stain and an antibody step.
An example process flow can be as shown in Table 1 below. Variations of the times below are within the skill of the art.
16 hours
Additional wash steps may also be performed that do not require a high degree of temperature control, where for instance the ambient temperature within the instrument environment may provide acceptable results. As shown in
As described above, other embodiments of station 220 may include hybridization station, stain station, scan prep station, and antibody station that each may have one or more specialized elements such as trays enabled to carry out or prepare for one or more processing steps. For example, stain station 315 may also be associated with a multiple use tray 416 as illustrated in
The scan prep station 320 may include one or more specialized elements that could, for instance, include a scan tray 418 that has an optically clear bottom that allows for excitation and emission light to pass. Manipulator 210 may position strip 405 in a corresponding scan tray 418 that may operatively couple with strip 405. Furthermore, a strip 405 may comprise one or more alignment features 620 and/or one or more engagement features 1000 as shown in
According to another embodiment, stations 220 may include hybridization (hyb) station 310 that may include a hybridization tray 417 (
Additional examples of the process, system, etc. are described in U.S Patent Publication Nos. 2006-024576 A1, 2006-0234371A1, and 2008-0003667 A1, which are hereby incorporated by reference herein in its entirety for all purposes.
The fluid processing instrument 105 may be coupled to a hybridization station and scanning station for convenient positioning of the individual elements of the system. As shown in
The trays can be designed for 96 wells or any other convenient arrangement. For example commercial microtiter plates are available in 96, 384, and 1536 wells. 9 mm pitch (distance between wells) is preferred for 96 well plates. The plates can be constructed of many types of durable materials, for example hard plastics like Lexan HP1-112 or polycarbonate, to name a few. They should be structurally sound and machineable within the appropriate engineering specifications. The finished parts should be free of defects like splay, sink marks, scratches and wild lines. No contaminating lubricants or other chemicals should be in the well cavity to affect the hybridization. Smaller trays such as the wash station 305 should be similarly constructed.
According to another embodiment, a device that can accommodate single pegs with associated hybridization trays provide additional flexibility.
In a further embodiment, a device may be employed to hold peg strips 450 together to be processed as a unit.
Once the snaps 1415 and 1416 are engaged, the spring retracts and applies spring force to keep the snaps fastened. The peg strip 405 is then held in place securely to the adapter plate 1405. The peg strip 405 can be disassembled from the adapter plate 1405 by pushing against the end handle of the snap-fit bracket 1410 to disengage the snap-fit.
The adapter plate 1405 and the peg strip 405 each have their own snap features. The peg strip 405 is assembled to the adapter plate 1405 via the snap lock mechanism 1410 established by the snap features. The snap fit bracket may contain a snap 1415 on the bracket to connect with a snap 1416 on the strip 405. Other methods of attachment can be used such as clamps, toggles, screws and other fasteners known to those of skill in the art. In the embodiment shown in
Having described various embodiments and implementations, it should be apparent to those skilled in the relevant art that the foregoing is illustrative only and not limiting, having been presented by way of example only. Many other schemes for distributing functions among the various functional elements of the illustrated embodiment are possible. The functions of any element may be carried out in various ways in alternative embodiments.
Also, the functions of several elements may, in alternative embodiments, be carried out by fewer, or a single, element. Similarly, in some embodiments, any functional element may perform fewer, or different, operations than those described with respect to the illustrated embodiment. Also, functional elements showed as distinct for purposes of illustration may be incorporated within other functional elements in a particular implementation. Also, the sequencing of functions or portions of functions generally may be altered. Certain functional elements, files, data structures, and so on may be described in the illustrated embodiments as located in system memory of a particular computer or instrument. In other embodiments, however, they may be located on, or distributed across, computer systems, instruments, or other platforms that are co-located and/or remote from each other. For example, any one or more of data files or data structures described as co-located on and “local” to a server or other computer may be located in a computer system or systems remote from the server. In addition, it will be understood by those skilled in the relevant art that control and data flows between and among functional elements and various data structures may vary in many ways from the control and data flows described above or in documents incorporated by reference herein. More particularly, intermediary functional elements may direct control or data flows, and the functions of various elements may be combined, divided, or otherwise rearranged to allow parallel processing or for other reasons. Also, intermediate data structures or files may be used and various described data structures or files may be combined or otherwise arranged. Numerous other embodiments, and modifications thereof, are contemplated as falling within the scope of the invention as defined by appended claims and equivalents thereto.
According to an embodiment of the invention, a liquid handling tray for processing nucleic acid arrays on a deck is provided. The tray comprises a plurality of wells arranged in rows. The wells contain reagents to interact with the nucleic acid arrays. In a preferred embodiment, the tray comprises a first orientation marking and the deck comprises a corresponding second orientation marking to ensure that the correct tray is placed in a correct location orientation on the deck. The user matches the orientation markings while placing the tray on the deck. In a further embodiment, the orientation markings of the trays are distinguished from the other trays by shape, color, pattern or a combination thereof.
According to another embodiment of the invention, an automated and flexible liquid handling system for processing nucleic acid arrays is provided. The system comprises a computer system for processing and acquiring data from the nucleic acid arrays processed on a deck comprising a plurality of stations. Each station holds a specific tray for a specific process, wherein each station is labeled with a first orientation marking to indicate the specific process. A plurality of labeled trays containing a plurality of wells arranged in rows is provided. The wells have reagents to interact with the nucleic acid arrays. The labeled tray comprises a corresponding second orientation marking to ensure that each labeled tray is placed in a correct station and in a specific orientation. In a preferred embodiment, nucleic acid arrays are on a strip of pegs, wherein a plurality of pegs holding the nucleic acid array is mounted on a strip. In a preferred embodiment, the number of arrays on an array peg strip is 8. In a more preferred embodiment, the number of arrays on an array peg strip is 4. The system may consist of a wash step, hybridization step, stain step, antibody step, and a scan step. The deck is mounted and fixed on the instrument such that the trays on the deck are accessible to a user. Furthermore, the deck comprises a latch to reliably ensure that a labeled tray slides into place on the deck. In a preferred embodiment, the tray comprises a first orientation marking and the deck comprises a corresponding second orientation marking to ensure that the tray is placed in a correct location and orientation on the deck. The user matches the orientation markings while placing the tray on the deck. In a further embodiment, the orientation markings of the trays are distinguished from other trays by shape, color, pattern or a combination thereof.
| Number | Date | Country | |
|---|---|---|---|
| 61164345 | Mar 2009 | US |
