Patent Grant
11193121
The instant application contains a Sequence Listing which has been submitted electronically in ASCII format and is hereby incorporated by reference in its entirety. Said ASCII copy, created on Oct. 25, 2018, is named 43487-705303SL.txt and is 4,650 bytes in size.
The partitioning and processing of species such as analytes and reagents is important for a variety of applications, including molecular biology applications and medical applications. Appropriate sample preparation is often needed prior to performing a reaction such as a polynucleotide sequencing reaction or an analyte detection reaction. For example, a sample such as a biological sample, including a collection of cells, tissue, and/or nucleic acids may need to be lysed, fragmented, or otherwise manipulated in order to permit downstream analysis. Sample preparation may also involve isolating certain molecules, and/or attaching unique identifiers to certain molecules, among other processes. There is a need in the art for improved methods, compositions, systems, devices, and kits for partitioning and processing of species.
This disclosure provides methods, compositions, systems, devices, and kits for partitioning and processing of species. The exemplary embodiments provided in this summary are, in no way, intended to be limiting, and are only provided for illustrative purposes. Other embodiments are disclosed throughout this disclosure.
In some cases, the disclosure provides compositions comprising a plurality of capsules, the capsules situated within droplets in an emulsion, wherein the capsules are configured to release their contents into the droplets upon the application of a stimulus.
In some cases, the capsules comprise a species selected from the group consisting of a reagent and an analyte. In some cases, the droplets comprise a species selected from the group consisting of a reagent and an analyte.
In some cases a reagent is a protein, a polynucleotide, an enzyme, an antibody, a barcode, an adapter, a buffer, a small molecule, a detergent, a dye, a polymer and combinations thereof. In some cases, a reagent is an enzyme selected from the group consisting of a proteinase, a restriction enzyme, a ligase, a polymerase, a fragmentase, a reverse transcriptase, a transposase, and combinations thereof. In some cases an enzyme is a restriction enzyme that is a rare cutter. A reagent that is a barcode may be, for example, an oligonucleotide barcode.
An analyte may be any suitable analyte, for example a cell, a polynucleotide, a chromosome, a protein, a peptide, a polysaccharide, a sugar, a lipid, a small molecule, and combinations thereof. In some cases, an analyte is a polynucleotide. In some cases, the polynucleotide is selected from the group consisting of DNA, RNA, cDNA, and combinations thereof. In some cases, the amount of polynucleotide in a composition disclosed herein is about 1-3 ng. In some cases, the amount of polynucleotide in a composition disclosed herein is an amount sufficient to provide about 100-200× sequence coverage.
In some cases, a capsule may comprise on average, about one chromosome per capsule.
In some cases, each droplet may comprise, on average, about 1 capsule per droplet. In some cases, each droplet can hold, at most, a single capsule.
In some cases, at least one of the capsules comprises a further partition. The further partition may be, for example, selected from the group consisting of a capsule and a droplet in an emulsion.
In some cases, at least one of the capsules has a shell selected from the group consisting of a polymeric shell, a hydrogel, a hydrophilic shell, a hydrophobic shell, a shell with a net positive charge, a shell with a net negative charge, a shell with a neutral charge, and combinations thereof. In some cases, a capsule is formed from a hydrogel droplet.
In some cases, a capsule is responsive to a stimulus is selected from the group consisting of a chemical stimulus, a bulk stimulus, a biological stimulus, a light stimulus, a thermal stimulus, a magnetic stimulus, and combinations thereof. In some cases, a thermal stimulus comprises causing the composition to reach a temperature of at least 32 degrees Celsius. In some cases, the stimulus is selected from the group consisting of a change in pH, a change in ion concentration, reduction of disulfide bonds, and combinations thereof.
In some cases, capsules have a mean diameter of 1 micron to 250 microns, 1 micron to 100 microns, 1 micron to 50 microns, 10 microns to 100 microns, or 50 microns to 100 microns. In some cases droplets have a mean diameter of about 1 micron to about 250 microns, 1 micron to 100 microns, 1 micron to 50 microns, 10 microns to 100 microns, or 50 microns to 100 microns.
In some cases capsules have a mean volume of 1 picoliter to 1 microliter, 1 picoliter to 0.5 microliters, 1 picoliter to 0.1 microliters, 100 picoliters to 0.1 microliters, or 100 nanoliters to 500 nanoliters. In some cases droplets have a mean volume of about 1 picoliter to about 1 microliter, 1 picoliter to 0.5 microliters, 1 picoliter to 0.1 microliters, 100 picoliters to 0.1 microliters, or 100 nanoliters to 500 nanoliters.
In some cases the droplets comprise a fluid that is of a lesser density than the density of the capsules. In some cases the droplets comprise a fluid that is of a greater density than the density of the capsules.
In some cases capsules are produced by a method selected from the group consisting of emulsification polymerization, layer-by-layer assembly with polyelectrolytes, coacervation, internal phase separation, flow focusing, and combinations thereof.
In some cases a stimulus is applied to the capsules. In some cases a stimulus is applied to the droplets.
In some cases this disclosure provides compositions comprising a plurality of outer capsules, the outer capsules comprising at least one inner capsule, wherein the at least one inner capsule is configured to release its contents into at least one outer capsule among the plurality of outer capsules upon the application of a stimulus.
In some cases the inner capsule comprises a species selected from the group consisting of a reagent and an analyte. In some cases the outer capsules comprise a species selected from the group consisting of a reagent and an analyte.
In some cases the reagent is selected from the group consisting of a protein, a polynucleotide, an enzyme, an antibody, a barcode, an adapter, a buffer, a small molecule, a detergent, a dye, a polymer and combinations thereof. In some cases an enzyme is selected from the group consisting of a proteinase, a restriction enzyme, a ligase, a polymerase, a fragmentase, a reverse transcriptase, a transposase, and combinations thereof. In some cases the restriction enzyme is a restriction enzyme that is a rare cutter. In some cases the reagent is a barcode that is an oligonucleotide barcode.
In some cases the analyte is selected from the group consisting of a cell, a polynucleotide, a chromosome, a protein, a peptide, a polysaccharide, a sugar, a lipid, a small molecule, and combinations thereof. In some cases the analyte is a polynucleotide. In some cases the polynucleotide is selected from the group consisting of DNA, RNA, cDNA, and combinations thereof. In some cases the amount of the polynucleotide in a composition of this disclosure is about 1-3 ng. In some cases the amount of the polynucleotide in a composition of this disclosure is an amount sufficient to provide about 100-200× sequence coverage.
In some cases capsule comprises, on average, about one chromosome. In some cases each outer capsule comprises, on average, about 1 inner capsule per outer capsule. In some cases each outer capsule can hold, at most, a single inner capsule.
In some cases at least one inner capsule comprises a further partition. In some cases, the further partition is selected from the group consisting of a capsule and a droplet in an emulsion.
In some cases a capsule has a shell selected from the group consisting of a polymeric shell, a hydrogel, a hydrophilic shell, a hydrophobic shell, a shell with a net positive charge, a shell with a net negative charge, a shell with a neutral charge, and combinations thereof.
In some cases a capsule is responsive to a stimulus is selected from the group consisting of a chemical stimulus, a bulk stimulus, a biological stimulus, a light stimulus, a thermal stimulus, a magnetic stimulus, and combinations thereof. In some cases the thermal stimulus comprises causing the composition to reach a temperature of at least 32 degrees Celsius. In some cases the stimulus is selected from the group consisting of a change in pH, a change in ion concentration, reduction of disulfide bonds, and combinations thereof.
In some cases the inner capsules have a mean diameter of 1 micron to 250 microns, 1 micron to 100 microns, 1 micron to 50 microns, 10 microns to 100 microns, or 50 microns to 100 microns. In some cases the outer capsules have a mean diameter of 1 micron to 250 microns, 1 micron to 100 microns, 1 micron to 50 microns, 10 microns to 100 microns, or 50 microns to 100 microns.
In some cases the inner capsules have a mean volume of 1 picoliter to 1 microliter, 1 picoliter to 0.5 microliters, 1 picoliter to 0.1 microliters, 100 picoliters to 0.1 microliters, or 100 nanoliters to 500 nanoliters. In some cases the outer capsules have a mean volume of 1 picoliter to 1 microliter, 1 picoliter to 0.5 microliters, 1 picoliter to 0.1 microliters, 100 picoliters to 0.1 microliters, or 100 nanoliters to 500 nanoliters.
In some cases the outer capsules comprise a fluid that is of a lesser density than the density of the inner capsules. In some cases the outer capsules comprise a fluid that is of a greater density than the density of the inner capsules.
In some cases the capsules are produced by a method selected from the group consisting of emulsification polymerization, layer-by-layer assembly with polyelectrolytes, coacervation, internal phase separation, flow focusing, and combinations thereof.
In some cases the stimulus is applied to the inner capsule. In some cases the stimulus is applied to the outer capsule.
In some cases this disclosure provides a composition comprising a plurality of discrete spots disposed on a surface within a well, wherein each spot comprises a species and the spots are configured to release the species upon application of a stimulus. In some cases the species is selected from the group consisting of a reagent and an analyte. In some cases a composition of this disclosure further comprises a medium, wherein the medium comprises a species selected from the group consisting of a reagent and an analyte.
In some cases the reagent is selected from the group consisting of a protein, a polynucleotide, an enzyme, an antibody, a barcode, an adapter, a buffer, a small molecule, a detergent, a dye, a polymer and combinations thereof. In some cases the enzyme is selected from the group consisting of a proteinase, a restriction enzyme, a ligase, a polymerase, a fragmentase, a reverse transcriptase, a transposase, and combinations thereof. In some cases the restriction enzyme is a restriction enzyme that is a rare cutter. In some cases the barcode is an oligonucleotide barcode.
In some cases the analyte is selected from the group consisting of a cell, a polynucleotide, a chromosome, a protein, a peptide, a polysaccharide, a sugar, a lipid, a small molecule, and combinations thereof. In some cases the analyte is a polynucleotide. In some cases polynucleotide is selected from the group consisting of DNA, RNA, cDNA, and combinations thereof. In some cases the amount of the polynucleotide in the composition is about 1-3 ng. In some cases the amount of the polynucleotide in a composition of this disclosure is an amount sufficient to provide about 100-200× sequence coverage.
In some cases each well comprises at least 4 spots. In some cases at least one of the spots comprises a further partition. In some cases the further partition is selected from the group consisting of a capsule and a droplet in an emulsion.
In some cases the stimulus that releases a species from a spot is the introduction of a medium comprising an analyte into the well.
In some cases the spots have a mean diameter of about 1 micron to about 250 microns, 1 micron to 150 microns, 1 micron to 100 microns, 1 micron to 50 microns, 1 micron to 25 microns, or 1 micron to 10 microns.
In some cases this disclosure provides devices comprising a plurality of partitions, wherein at least one partition of the plurality of partitions comprises a capsule, wherein the capsule is situated within a droplet in an emulsion, wherein the capsule is configured to release its contents into the droplet upon the application of a stimulus. In some cases the plurality of partitions are selected from the group consisting of wells and spots.
In some cases the device is formed from a material selected from the group consisting of fused silica, soda lime glass, borosilicate glass, poly(methyl methacrylate), sapphire, silicon, germanium, cyclic olefin copolymer, polyethylene, polypropylene, polyacrylate, polycarbonate, plastic, and combinations thereof.
In some cases the device comprises at least 1,000 partitions. In some cases the partitions have a density selected from the group consisting of at least about 1,000 partitions/cm2 and at least about 10,000 partitions/cm2.
In some cases the partitions are disposed along a fluid flow path having a fluid inlet and a fluid outlet.
In some cases the partitions are wells are disposed within a glass slide. In some cases the partitions are spots disposed on a glass slide.
In some cases the partitions have an interior surface comprising a hydrophilic material. In some cases a surface exterior to the partitions comprises a hydrophobic material. In some cases a fluid flow path comprises a surface comprising a hydrophobic material.
In some cases this disclosure provides devices comprising a plurality of partitions, wherein at least one partition of the plurality of partitions comprises an outer capsule, the outer capsule comprising at least one inner capsule, wherein the at least one inner capsule is configured to release its contents into the outer capsule upon the application of a stimulus. In some cases the plurality of partitions are selected from the group consisting of wells and spots.
In some cases the device is formed from a material selected from the group consisting of fused silica, soda lime glass, borosilicate glass, poly(methyl methacrylate), sapphire, silicon, germanium, cyclic olefin copolymer, polyethylene, polypropylene, polyacrylate, polycarbonate, plastic, and combinations thereof.
In some cases the device comprises at least 1,000 partitions. In some cases the partitions have a density selected from the group consisting of at least about 1,000 partitions/cm2 and at least about 10,000 partitions/cm2.
In some cases the partitions are disposed along a fluid flow path having a fluid inlet and a fluid outlet.
In some cases the partitions are wells are disposed within a glass slide. In some cases the partitions are spots disposed on a glass slide.
In some cases the partitions have an interior surface comprising a hydrophilic material. In some cases a surface exterior to the partitions comprises a hydrophobic material. In some cases the fluid flow path comprises a surface comprising a hydrophobic material.
In some cases this disclosure provides devices comprising a plurality of wells, wherein at least one well of the plurality of wells comprises a plurality of discrete spots disposed on a surface within the well, wherein each spot comprises a species and the spots are configured to release the species upon application of a stimulus.
In some cases the device is formed from a material selected from the group consisting of fused silica, soda lime glass, borosilicate glass, poly(methyl methacrylate), sapphire, silicon, germanium, cyclic olefin copolymer, polyethylene, polypropylene, polyacrylate, polycarbonate, plastic, and combinations thereof.
In some cases the device comprises at least 1,000 wells. In some cases the wells have a density selected from the group consisting of at least about 1,000 wells/cm2 and at least about 10,000 wells/cm2.
In some cases the wells are disposed along a fluid flow path having a fluid inlet and a fluid outlet.
In some cases the wells are disposed within a glass slide. In some cases the spots are disposed on a glass slide.
In some cases the wells have an interior surface comprising a hydrophilic material. In some cases a surface exterior to the wells comprises a hydrophobic material. In some cases the fluid flow path comprises a surface comprising a hydrophobic material.
In some cases this disclosure provides a method comprising: (a) providing a plurality of capsules, the capsules situated within droplets in an emulsion, wherein the capsules are configured to release their contents into the droplets upon the application of a stimulus; and (b) providing a stimulus to cause the capsules to release their contents into the droplets.
In some cases the capsules comprise a species selected from the group consisting of a reagent and an analyte. In some cases the droplets comprise a species selected from the group consisting of a reagent and an analyte.
In some cases causing the capsules to release their contents into the droplets results in contact between a polynucleotide and an enzyme. In some cases causing the capsules to release their contents into the droplets results in contact between a polynucleotide and a barcode.
In some cases the analyte is a polynucleotide present in a predetermined coverage amount.
In some cases the method further comprises the step of sequencing the polynucleotide. In some cases the method further comprises the step of performing a polynucleotide phasing analysis.
In some cases this disclosure provides a method comprising: (a) providing a plurality of inner capsules, the inner capsules situated within outer capsules, wherein the inner capsules are configured to release their contents into the outer capsules upon the application of a stimulus; and (b) providing a stimulus to cause the inner capsules to release their contents into the outer capsules.
In some cases the inner capsules comprise a species selected from the group consisting of a reagent and an analyte. In some cases the outer capsules comprise a species selected from the group consisting of a reagent and an analyte.
In some cases causing the inner capsules to release their contents into the outer capsules results in contact between a polynucleotide and an enzyme. In some cases causing the inner capsules to release their contents into the outer capsules results in contact between a polynucleotide and a barcode.
In some cases the analyte is a polynucleotide present in a predetermined coverage amount.
In some cases the method further comprises the step of sequencing the polynucleotide. In some cases the method further comprises the step of performing a polynucleotide phasing analysis.
In some cases this disclosure provides a method comprising: (a) providing a well comprising a plurality of discrete spots disposed on a surface within the well, wherein each spot comprises a species and the spots are configured to release the species upon application of a stimulus; (b) adding a medium comprising a species to the well; and (c) providing a stimulus to cause the spots to release their contents into the well.
In some cases the spots comprise a species selected from the group consisting of a reagent and an analyte. In some cases the medium comprises a species selected from the group consisting of a reagent and an analyte.
In some cases causing the spots to release their contents into the well results in contact between a polynucleotide and an enzyme. In some cases causing the spots to release their contents into the well results in contact between a polynucleotide and a barcode.
In some cases the analyte is a polynucleotide present in a predetermined coverage amount.
In some cases the method further comprises the step of sequencing the polynucleotide. In some cases the method further comprises the step of performing a polynucleotide phasing analysis.
In some cases this disclosure provides a method comprising: (a) providing a sample comprising a cell; (b) lysing the cell, thereby generating a lysate; and (c) partitioning the lysate into a capsule.
In some cases the sample comprises a plurality of cells. In some cases the plurality of cells comprises 1 to 100,000 cells, 10 to 10,000 cells, 100 to 5,000 cells, or 1,000 to 5,000 cells.
In some cases lysing comprises a treatment with a proteinase. In some cases the proteinase is proteinase K.
In some cases after the partitioning, at least one of the capsules comprises a single copy of a polynucleotide from the cell. In some cases, at least one capsule comprises a mixture of polynucleotides, wherein none of the polynucleotides in the mixture are overlapping.
In some cases the polynucleotide is a chromosome.
In some cases the capsule comprises a shell with pores that restrict trans-shell transport of the polynucleotide but allow trans-shell transport of a species. In some cases the method further comprises the step of transporting an inner species from the interior of the capsule to the exterior of the capsule. In some cases the inner species is selected from the group consisting of a component of a buffer, a component of a cell, and a macromolecule. In some cases the method further comprises the step of transporting an outer species from the exterior of the capsule to the interior of the capsule. In some cases the outer species is selected from the group consisting of a reagent, a protein, a polynucleotide, an enzyme, an antibody, a barcode, an adapter, a buffer, a small molecule, a detergent, a dye, a polymer and combinations thereof. In some cases the outer species is a reagent for nucleic acid amplification.
In some cases the method further comprises the step of amplifying the encapsulated polynucleotide. In some cases the amplifying is performed by a method selected from the group consisting of multiple displacement amplification, polymerase chain reaction, ligase chain reaction, helicase-dependent amplification, and combinations thereof.
In some cases the method further comprises the step of fragmenting the encapsulated polynucleotide, thereby generating a fragmented polynucleotide. In some cases the method further comprises the step of attaching a barcode to the fragmented polynucleotide.
In some cases the method further comprises the step of placing the capsule comprising polynucleotide (or processed polynucleotide) into a partition. In some cases the partition is selected from the group consisting of a well, a droplet in an emulsion, and a capsule.
In some cases the capsule comprising the polynucleotide is configured to release its contents upon the application of a stimulus. In some cases the stimulus is selected from the group consisting of a chemical stimulus, a bulk stimulus, a biological stimulus, a light stimulus, a thermal stimulus, a magnetic stimulus, and combinations thereof.
In some cases the method further comprises the step of performing a polynucleotide phasing analysis.
In some cases this disclosure provides kits. In some cases the disclosure provides kits for generating capsules within droplets in an emulsion, the kits comprising reagents for generating capsules, reagents for generating an emulsion, and instructions for generating the capsules within droplets in an emulsion. In some cases the capsules are configured to release their contents into the droplets upon the application of a stimulus. In some cases the kits further comprise a species for inclusion in a partition selected from the group consisting of the capsules, the droplets, and combinations thereof.
In some cases, this disclosure provides kits for generating capsules within capsules, the kits comprising reagents for generating inner capsules, reagents for generating outer capsules, and instructions for generating capsules within capsules. In some cases the inner capsules are configured to release their contents into the outer capsules upon the application of a stimulus. In some cases, the kits further comprise a species for inclusion in a partition selected from the group consisting of the inner capsules, the outer capsules, and combinations thereof.
In some cases this disclosure provides kits comprising a plurality of discrete spots disposed on a surface within a well, wherein each spot comprises a species and the spots are configured to release the species upon application of a stimulus, and instructions for use of the kit to process a sample. In some cases the stimulus is the addition of a sample to the well.
In some cases this disclosure provides a method of partitioning polynucleotides comprising: (a) isolating polynucleotides from a source of polynucleotides; (b) partitioning the polynucleotides at a predetermined coverage amount, to produce a plurality of partitions, wherein at least one partition comprises a mixture of non-overlapping polynucleotides, thereby generating partitioned polynucleotides; and (c) fragmenting the partitioned polynucleotides, thereby generating fragmented polynucleotides.
In some cases the source is a cell.
In some cases at least about 50% of the partitions comprise a mixture of non-overlapping polynucleotides.
In some cases the method further comprises the step of amplifying the partitioned polynucleotides. In some cases, the method further comprises the step of barcoding the fragmented polynucleotides.
In some cases this disclosure provides a method of fragmenting a polynucleotide comprising: (a) providing a polynucleotide; (b) encapsulating the polynucleotide, thereby generating an encapsulated polynucleotide; and (c) fragmenting the polynucleotide, thereby generating an encapsulated fragmented polynucleotide.
In some cases the fragmenting is performed by ultrasonic waves.
In some cases the encapsulating disposes the polynucleotide within a capsule. In some cases the encapsulating disposes the polynucleotide within a droplet of a hydrogel.
In some cases the method further comprises the step of encapsulating the encapsulated polynucleotide within a capsule. In some cases the method further comprises the step of encapsulating the encapsulated polynucleotide within a droplet of a hydrogel.
An additional aspect of the disclosure provides the use of a composition, device, method, or kit described herein in partitioning species, in partitioning oligonucleotides, in stimulus-selective release of species from partitions, in performing reactions (e.g., ligation and amplification reactions) in partitions, in performing nucleic acid synthesis reactions, in barcoding nucleic acid, in preparing polynucleotides for sequencing, in sequencing polynucleotides, in mutation detection, in neurologic disorder diagnostics, in diabetes diagnostics, in fetal aneuploidy diagnostics, in cancer mutation detection and forensics, in disease detection, in medical diagnostics, in low input nucleic acid applications, in circulating tumor cell (CTC) sequencing, in polynucleotide phasing, in sequencing polynucleotides from small numbers of cells, in analyzing gene expression, in partitioning polynucleotides from cells, or in a combination thereof.
All publications, patents, and patent applications mentioned in this specification are herein incorporated by reference to the same extent as if each individual publication, patent, or patent application was specifically and individually indicated to be incorporated by reference.
The novel features of methods, compositions, systems, and devices of this disclosure are set forth with particularity in the appended claims. A better understanding of the features and advantages of this disclosure will be obtained by reference to the following detailed description that sets forth illustrative embodiments, in which the principles of the methods, compositions, systems, and devices of this disclosure are utilized, and the accompanying drawings of which:
While various embodiments of the invention have been shown and described herein, it will be obvious to those skilled in the art that such embodiments are provided by way of example only. Numerous variations, changes, and substitutions may occur to those skilled in the art without departing from the invention. It should be understood that various alternatives to the embodiments of the invention described herein may be employed.
This disclosure provides methods, compositions, systems, devices, and kits for partitioning and processing of species. A species may be contained within a sample that may also comprise other species. The sample may be partitioned. A sample may comprise any suitable species, as described more fully elsewhere in this disclosure. In some cases, a sample comprises a species that is a reagent or an analyte. The methods, compositions, systems, devices, and kits may be used for a variety of applications. Analyte may be processed for any suitable application, including, for example, processing polynucleotides for polynucleotide sequencing. Polynucleotides sequencing includes the sequencing of whole genomes, detection of specific sequences such as single nucleotide polymorphisms (SNPs) and other mutations, detection of nucleic acid (e.g., deoxyribonucleic acid) insertions, and detection of nucleic acid deletions.
Utilization of the methods, compositions, systems, devices, and kits described herein may incorporate, unless otherwise indicated, any conventional techniques of organic chemistry, polymer technology, microfluidics, molecular biology, recombinant techniques, cell biology, biochemistry, and immunology. Such conventional techniques include well and microwell construction, capsule generation, generation of emulsions, spotting, microfluidic device construction, polymer chemistry, restriction digestion, ligation, cloning, polynucleotide sequencing, and polynucleotide sequence assembly. Specific, non-limiting, illustrations of suitable techniques are described throughout this disclosure. However, equivalent procedures may also be utilized. Descriptions of certain techniques 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), and “Oligonucleotide Synthesis: A Practical Approach” 1984, IRL Press London, all of which are herein incorporated in their entirety by reference for all purposes.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting.
As used herein, the singular forms “a,” “an,” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. Furthermore, to the extent that the terms “including,” “includes,” “having,” “has,” “with,” “such as,” or variants thereof, are used in either the specification and/or the claims, such terms are not limiting and are intended to be inclusive in a manner similar to the term “comprising”.
The term “about,” as used herein, generally refers to a range that is 15% greater than or less than a stated numerical value within the context of the particular usage. For example, “about 10” would include a range from 8.5 to 11.5.
The term “barcode,” as used herein, generally refers to a label that may be attached to an analyte to convey information about the analyte. For example, a barcode may be a polynucleotide sequence attached to all fragments of a target polynucleotide contained within a particular partition. This barcode may then be sequenced with the fragments of the target polynucleotide. The presence of the same barcode on multiple sequences may provide information about the origin of the sequence. For example, a barcode may indicate that the sequence came from a particular partition and/or a proximal region of a genome. This may be particularly useful when several partitions are pooled before sequencing.
The term “bp,” as used herein, generally refers to an abbreviation for “base pairs”.
The term “microwell,” as used herein, generally refers to a well with a volume of less than 1 mL. Microwells may be made in various volumes, depending on the application. For example, microwells may be made in a size appropriate to accommodate any of the partition volumes described herein.
The term “partition,” as used herein, may be a verb or a noun. When used as a verb (e.g., “to partition,” or “partitioning”), the term generally refers to the fractionation (subdivision) of a species or sample (e.g., a polynucleotide) between vessels that can be used to sequester one fraction (or subdivision) from another. Such vessels are referred to using the noun “partition.” Partitioning may be performed, for example, using microfluidics, dilution, dispensing, and the like. A partition may be, for example, a well, a microwell, a hole, a droplet (e.g., a droplet in an emulsion), a continuous phase of an emulsion, a test tube, a spot, a capsule, or any other suitable container for sequestering one fraction of a sample from another.
The terms “polynucleotide” or “nucleic acid,” as used herein, generally refer to molecules comprising a plurality of nucleotides. Exemplary polynucleotides include deoxyribonucleic acids, ribonucleic acids, and synthetic analogues thereof, including peptide nucleic acids.
The term “species,” as used herein, generally refers to any substance that can be used with the methods, compositions, systems, devices, and kits of this disclosure. Examples of species include reagents, analytes, cells, chromosomes, tagging molecules or groups of molecules, barcodes, and any sample comprising any of these species. Any suitable species may be used, as more fully discussed elsewhere in this disclosure.
a. General Characteristics of Partitions
As described throughout this disclosure, certain methods, compositions, systems, devices, and kits of the disclosure may utilize the subdivision (partitioning) of certain species into separate partitions. A partition may be, for example, a well, a microwell, a hole, a droplet (e.g., a droplet in an emulsion), a continuous phase of an emulsion, a test tube, a spot, a bead (e.g., a gel bead, a paraffin bead, a wax bead), a capsule, or any other suitable container for sequestering one fraction of a sample or a species. In some cases, a capsule is a bead (e.g., a gel bead). Partitions may be used to contain a species for further processing. For example, if a species is a polynucleotide analyte, further processing may comprise cutting, ligating, and/or barcoding with species that are reagents. Any number of devices, systems or containers may be used to hold, support or contain partitions. In some cases, a microwell plate may be used to hold, support, or contain partitions. Any suitable microwell plate may be used, for example microwell plates having 96, 384, or 1536 wells.
Each partition may also contain, or be contained within any other suitable partition. For example, a well, microwell, hole, or tube may comprise a droplet (e.g., a droplet in an emulsion), a continuous phase in an emulsion, a spot, a capsule, or any other suitable partition. A droplet may comprise a capsule or another droplet. A capsule may comprise a droplet or another capsule. These descriptions are merely illustrative, and all suitable combinations and pluralities are also envisioned. For example, any suitable partition may comprise a plurality of the same or different partitions. In one example, a well or microwell comprises a plurality of droplets and a plurality of capsules. In another example, a capsule comprises a plurality of capsules and a plurality of droplets. All combinations of partitions are envisioned. Table 1 shows non-limiting examples of partitions that may be combined with each other.
Any partition described herein may comprise multiple partitions. For example, a partition may comprise 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 50, 100, 500, 1000, 1500, 2000, 2500, 3000, 3500, 4000, 4500, 5000, 5500, 6000, 6500, 7000, 7500, 8000, 8500, 9000, 9500, 10000, or 50000 partitions. A partition may comprise at least 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 50, 100, 500, 1000, 1500, 2000, 2500, 3000, 3500, 4000, 4500, 5000, 5500, 6000, 6500, 7000, 7500, 8000, 8500, 9000, 9500, 10000, or 50000 partitions. In some cases, a partition may comprise less than 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 50, 100, 500, 1000, 1500, 2000, 2500, 3000, 3500, 4000, 4500, 5000, 5500, 6000, 6500, 7000, 7500, 8000, 8500, 9000, 9500, 10000, or 50000 partitions. In some cases, each partition may comprise 2-50, 2-20, 2-10, or 2-5 partitions.
A partition may comprise any suitable species or mixture of species. For example, in some cases a partition may comprise a reagent, an analyte, a sample, a cell, and combinations thereof. A partition comprising other partitions may comprise certain species in the same partitions and certain species in different partitions. Species may be distributed between any suitable partitions, depending on the needs of the particular process. For example, any of the partitions in Table 1 may contain at least one first species and any of the partitions in Table 1 may contain at least one second species. In some cases the first species may be a reagent and the second species may be an analyte.
In some cases, a species is a polynucleotide isolated from a cell. For example, in some cases polynucleotides (e.g., genomic DNA, RNA, etc.) is isolated from a cell utilizing any suitable method (e.g., a commercially available kit). The polynucleotide may be quantified. The quantified polynucleotide may then be partitioned into a plurality of partitions as described herein. The partitioning of the polynucleotide may be performed at a predetermined coverage amount, according to the quantification and the needs of the assay. In some cases, all or most partitions do not comprise polynucleotides that overlap, such that separate mixtures of non-overlapping fragments are formed across the plurality of partitions. The partitioned polynucleotides may then be treated according to any suitable method known in the art or described in this disclosure. For example, the partitioned polynucleotides may be fragmented, amplified, barcoded, and the like.
Species may be partitioned using a variety of methods. For example, species may be diluted and dispensed across a plurality of partitions. A terminal dilution of a medium comprising species may be performed such that the number of partitions exceeds the number of species. Dilution may also be used prior to forming an emulsion or capsules, or prior to spotting a species on a substrate. The ratio of the number of species to the number of partitions may be about 0.1, 0.5, 1, 2, 4, 8, 10, 20, 50, 100, or 1000. The ratio of the number of species to the number of partitions may be at least about 0.1, 0.5, 1, 2, 4, 8, 10, 20, 50, 100, or 1000. The ratio of the number of species to the number of partitions may be less than about 0.1, 0.5, 1, 2, 4, 8, 10, 20, 50, 100, or 1000. The ratio of the number of species to the number of partitions may range from about 0.1-10, 0.5-10, 1-10, 2-10, 10-100, 100-1000, or more.
Partitioning may also be performed using piezoelectric droplet generation (e.g., Bransky et al., Lab on a Chip, 2009, 9, 516-520) or surface acoustic waves (e.g., Demirci and Montesano, Lab on a Chip, 2007, 7, 1139-1145).
The number of partitions employed may vary depending on the application. For example, the number of partitions may be about 5, 10, 50, 100, 250, 500, 750, 1000, 1500, 2000, 2500, 5000, 7500, or 10,000, 20000, 30000, 40000, 50000, 60000, 70000, 80000, 90000, 100,000, 200000, 300000, 400000, 500000, 600000, 700000, 800000, 900000, 1,000,000, 2000000, 3000000, 4000000, 5000000, 10000000, 20000000 or more. The number of partitions may be at least about 5, 10, 50, 100, 250, 500, 750, 1000, 1500, 2000, 2500, 5000, 7500, 10,000, 20000, 30000, 40000, 50000, 60000, 70000, 80000, 90000, 100000, 200000, 300000, 400000, 500000, 600000, 700000, 800000, 900000, 1000000, 2000000, 3000000, 4000000, 5000000, 10000000, 20000000 or more. The number of partitions may be less than about 5, 10, 50, 100, 250, 500, 750, 1000, 1500, 2000, 2500, 5000, 7500, 10,000, 20000, 30000, 40000, 50000, 60000, 70000, 80000, 90000, 100000, 200000, 300000, 400000, 500000, 600000, 700000, 800000, 900000, 1000000, 2000000, 3000000, 4000000, 5000000, 10000000, or 20000000. The number of partitions may be about 5-10000000, 5-5000000, 5-1,000,000, 10-10,000, 10-5,000, 10-1,000, 1,000-6,000, 1,000-5,000, 1,000-4,000, 1,000-3,000, or 1,000-2,000.
The volume of the partitions may vary depending on the application. For example, the volume of any of the partitions described in this disclosure (e.g., wells, spots, droplets (e.g., in an emulsion), and capsules) may be about 1000 μl, 900 μl, 800 μl, 700 μl, 600 μl, 500 μl, 400 μl, 300 μl, 200 μl, 100 μl, 50 μl, 25 μl, 10 μl, 5 μl, 1 μl, 900 nL, 800 nL, 700 nL, 600 nL, 500 nL, 400 nL, 300 nL, 200 nL, 100 nL, 50 nL, 25 nL, 10 nL, 5 nL, 2.5 nL, 1 nL, 900 pL, 800 pL, 700 pL, 600 pL, 500 pL, 400 pL, 300 pL, 200 pL, 100 pL, 50 pL, 25 pL, 10 pL, 5 pL, 1 pL, 900 fL, 800 fL, 700 fL, 600 fL, 500 fL, 400 fL, 300 fL, 200 fL, 100 fL, 50 fL, 25 fL, 10 fL, 5 fL, 1 fL, or 0.5 fL. The volume of the partitions may be at least about 1000 μl, 900 μl, 800 μl, 700 μl, 600 μl, 500 μl, 400 μl, 300 μl, 200 μl, 100 μl, 50 μl, 25 μl, 10 μl, 5 μl, 1 μl, 900 nL, 800 nL, 700 nL, 600 nL, 500 nL, 400 nL, 300 nL, 200 nL, 100 nL, 50 nL, 25 nL, 10 nL, 5 nL, 5 nL, 2.5 nL, 1 nL, 900 pL, 800 pL, 700 pL, 600 pL, 500 pL, 400 pL, 300 pL, 200 pL, 100 pL, 50 pL, 25 pL, 10 pL, 5 pL, 1 pL, 900 fL, 800 fL, 700 fL, 600 fL, 500 fL, 400 fL, 300 fL, 200 fL, 100 fL, 50 fL, 25 fL, 10 fL, 5 fL, 1 fL, or 0.5 fL. The volume of the partitions may be less than about 1000 μl, 900 μl, 800 μl, 700 μl, 600 μl, 500 μl, 400 μl, 300 μl, 200 μl, 100 μl, 50 μl, 25 μl, 10 μl, 5 μl, 1 μl, 900 nL, 800 nL, 700 nL, 600 nL, 500 nL, 400 nL, 300 nL, 200 nL, 100 nL, 50 nL, 25 nL, 10 nL, 5 nL, 5 nL, 2.5 nL, 1 nL, 900 pL, 800 pL, 700 pL, 600 pL, 500 pL, 400 pL, 300 pL, 200 pL, 100 pL, 50 pL, 25 pL, 10 pL, 5 pL, 1 pL, 900 fL, 800 fL, 700 fL, 600 fL, 500 fL, 400 fL, 300 fL, 200 fL, 100 fL, 50 fL, 25 fL, 10 fL, 5 fL, 1 fL, or 0.5 fL. The volume of the partitions may be about 0.5 fL-5 pL, 10 pL-10 nL, 10 nL-10 μl, 10 μl-100 μl, or 100 μl to 1 mL.
There may be variability in the volume of fluid in different partitions. More specifically, the volume of different partitions may vary by at least (or at most) plus or minus 1%, 2%, 3%, 4%, 5%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 100%, 200%, 300%, 400%, 500%, or 1000% across a set of partitions. For example, a well (or other partition) may comprise a volume of fluid that is at most 80% of the fluid volume within a second well (or other partition).
Particular species may also be targeted to specific partitions. For example, in some cases, a capture reagent (e.g., an oligonucleotide probe) may be immobilized or placed within a partition to capture specific species (e.g., polynucleotides).
The number of different species or different sets of species that are partitioned may vary depending upon, for example, the particular species to be partitioned and/or the application. Different sets of species may be, for example, sets of identical species where the identical species differ between each set. Or different sets of species may be, for example, sets of different species, where each set differs in its included species. For example, about 1, 5, 10, 50, 100, 1000, 10000, 20,000, 30,000, 40,000, 50,000, 60,000, 70,000, 80,000, 90,000, 100000, 200,000, 300,000, 400,000, 500,000, 600,000, 700,000, 800,000, 900,000, 1000000, 2000000, 3000000, 4000000, 5000000, 6000000, 7000000, 8000000, 9000000, 10000000, 20000000, 50000000, 100000000, or more different species or different sets of species may be partitioned. In some examples, at least about 1, 5, 10, 50, 100, 1000, 10000, 20000, 30000, 40000, 50000, 60000, 70000, 80000, 90000, 100000, 200,000, 300,000, 400,000, 500,000, 600,000, 700,000, 800,000, 900,000, 1000000, 2000000, 3000000, 4000000, 5000000, 6000000, 7000000, 8000000, 9000000, 10000000, 20000000, 50000000, 100000000, or more different species or different sets of species may be partitioned. In some examples, less than about 1, 5, 10, 50, 100, 1000, 10000, 20000, 30000, 40000, 50000, 60000, 70000, 80000, 90000, 100000, 200,000, 300,000, 400,000, 500,000, 600,000, 700,000, 800,000, 900,000, 1000000, 2000000, 3000000, 4000000, 5000000, 6000000, 7000000, 8000000, 9000000, 10000000, 20000000, 50000000, or 100000000 different species or different sets of species may be partitioned. In some examples, about 1-5, 5-10, 10-50, 50-100, 100-1000, 1000-10000, 10000-100000, 100000-1000000, 10000-1000000, 10000-10000000, or 10000-100000000 species may be partitioned.
Species may also be partitioned at a particular density. For example, species may be partitioned so that each partition contains about 1, 5, 10, 50, 100, 1000, 10000, 20,000, 30,000, 40,000, 50,000, 60,000, 70,000, 80,000, 90,000, 100000, 200,000, 300,000, 400,000, 500,000, 600,000, 700,000, 800,000, 900,000, 1000000, 2000000, 3000000, 4000000, 5000000, 6000000, 7000000, 8000000, 9000000, 10000000, or 20000000 species per partition. Species may be partitioned so that each partition contains at least about 1, 5, 10, 50, 100, 1000, 10000, 20000, 30000, 40000, 50000, 60000, 70000, 80000, 90000, 100000, 200,000, 300,000, 400,000, 500,000, 600,000, 700,000, 800,000, 900,000, 1000000, 2000000, 3000000, 4000000, 5000000, 6000000, 7000000, 8000000, 9000000, 10000000, or 20000000 or more species per partition. Species may be partitioned so that each partition contains less than about 1, 5, 10, 50, 100, 1000, 10000, 20000, 30000, 40000, 50000, 60000, 70000, 80000, 90000, 100000, 200,000, 300,000, 400,000, 500,000, 600,000, 700,000, 800,000, 900,000, 1000000, 2000000, 3000000, 4000000, 5000000, 6000000, 7000000, 8000000, 9000000, 10000000, or 20000000 species per partition. Species may be partitioned such that each partition contains about 1-5, 5-10, 10-50, 50-100, 100-1000, 1000-10000, 10000-100000, 100000-1000000, 10000-1000000, or 10000-10000000 species per partition.
Species may also be partitioned such that identical species are partitioned at a particular density. For example, identical species may be partitioned so that each partition contains about 1, 5, 10, 50, 100, 1000, 10000, 20,000, 30,000, 40,000, 50,000, 60,000, 70,000, 80,000, 90,000, 100000, 200,000, 300,000, 400,000, 500,000, 600,000, 700,000, 800,000, 900,000, 1000000, 2000000, 3000000, 4000000, 5000000, 6000000, 7000000, 8000000, 9000000, 10000000, or 20000000 identical species per partition. Species may be partitioned so that each partition contains at least about 1, 5, 10, 50, 100, 1000, 10000, 20000, 30000, 40000, 50000, 60000, 70000, 80000, 90000, 100000, 200,000, 300,000, 400,000, 500,000, 600,000, 700,000, 800,000, 900,000, 1000000, 2000000, 3000000, 4000000, 5000000, 6000000, 7000000, 8000000, 9000000, 10000000, or 20000000 or more identical species per partition. Species may be partitioned so that each partition contains less than about 1, 5, 10, 50, 100, 1000, 10000, 20000, 30000, 40000, 50000, 60000, 70000, 80000, 90000, 100000, 200,000, 300,000, 400,000, 500,000, 600,000, 700,000, 800,000, 900,000, 1000000, 2000000, 3000000, 4000000, 5000000, 6000000, 7000000, 8000000, 9000000, 10000000, or 20000000 identical species per partition. Species may be partitioned such that each partition contains about 1-5, 5-10, 10-50, 50-100, 100-1000, 1000-10000, 10000-100000, 100000-1000000, 10000-1000000, or 10000-10000000 identical species per partition.
Species may also be partitioned such that different species are partitioned at a particular density. For example, different species may be partitioned so that each partition contains about 1, 5, 10, 50, 100, 1000, 10000, 20,000, 30,000, 40,000, 50,000, 60,000, 70,000, 80,000, 90,000, 100000, 200,000, 300,000, 400,000, 500,000, 600,000, 700,000, 800,000, 900,000, 1000000, 2000000, 3000000, 4000000, 5000000, 6000000, 7000000, 8000000, 9000000, 10000000, or 20000000 different species per partition. Species may be partitioned so that each partition contains at least about 1, 5, 10, 50, 100, 1000, 10000, 20000, 30000, 40000, 50000, 60000, 70000, 80000, 90000, 100000, 200,000, 300,000, 400,000, 500,000, 600,000, 700,000, 800,000, 900,000, 1000000, 2000000, 3000000, 4000000, 5000000, 6000000, 7000000, 8000000, 9000000, 10000000, or 20000000 or more different species per partition. Species may be partitioned so that each partition contains less than about 1, 5, 10, 50, 100, 1000, 10000, 20000, 30000, 40000, 50000, 60000, 70000, 80000, 90000, 100000, 200,000, 300,000, 400,000, 500,000, 600,000, 700,000, 800,000, 900,000, 1000000, 2000000, 3000000, 4000000, 5000000, 6000000, 7000000, 8000000, 9000000, 10000000, or 20000000 different species per partition. Species may be partitioned such that each partition contains about 1-5, 5-10, 10-50, 50-100, 100-1000, 1000-10000, 10000-100000, 100000-1000000, 10000-1000000, or 10000-10000000 different species per partition.
As will be appreciated, any of the above-described different numbers of species may be provided with any of the above-described barcode densities per partition, and in any of the above-described numbers of partitions.
Species may be partitioned such that at least one partition comprises a species that is unique within that partition. This may be true for about 1%, 5%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, or more of the partitions. This may be true for at least about 1%, 5%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, or more of the partitions. This may be true for less than about 1%, 5%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, or 90% of the partitions.
a. Wells as Partitions
In some cases, wells are used as partitions. The wells may be microwells. With reference to
In one example, reagents for sample processing are dispensed directly into a well and overlaid with a layer that is dissolvable, meltable, or permeable. A sample comprising an analyte to be processed is introduced on top of the layer. The layer is dissolved or melted, or the analyte (or reagent) diffuses through the layer. The well is sealed and incubated under appropriate conditions for the processing of the analyte. Processed analyte may then be recovered.
In some cases, wells comprise other partitions. A well may comprise any suitable partition including, for example, with reference to
In one example, a well comprises a capsule comprising reagents for sample processing. A capsule may be loaded into a well using a liquid medium, or loaded into a well without a liquid medium (e.g., essentially dry). As described elsewhere in this disclosure, a capsule may contain one or more capsules, or other partitions. A sample comprising an analyte to be processed is introduced into the well. The well is sealed and a stimulus is applied to cause release of the contents of the capsule into the well, resulting in contact between the reagents and the analyte to be processed. The well is incubated under appropriate conditions for the processing of the analyte. Processed analyte may then be recovered. While this example describes an embodiment where a reagent is in a capsule and an analyte is in the well, the opposite configuration—i.e., reagent in the well and analyte in the capsule—is also possible.
In another example, a well comprises an emulsion and the droplets of the emulsion comprise capsules comprising reagents for sample processing. A sample comprising an analyte to be processed is contained within the droplets of the emulsion. The well is sealed and a stimulus is applied to cause release of the contents of the capsules into the droplets, resulting in contact between the reagents and the analyte to be processed. The well is incubated under appropriate conditions for the processing of the analyte. Processed analyte may then be recovered. While this example describes an embodiment where a reagent is in a capsule and an analyte is in a droplet, the opposite configuration—i.e., reagent in the droplet and analyte in the capsule—is also possible.
Wells may be arranged as an array, for example a microwell array. Based on the dimensions of individual wells and the size of the substrate, the well array may comprise a range of well densities. In some cases, the well density may be 10 wells/cm2, 50 wells/cm2, 100 wells/cm2, 500 wells/cm2, 1000 wells/cm2, 5000 wells/cm2, 10000 wells/cm2, 50000 wells/cm2, or 100000 wells/cm2. In some cases, the well density may be at least 10 wells/cm2, 50 wells/cm2, 100 wells/cm2, 500 wells/cm2, 1000 wells/cm2, 5000 wells/cm2, 10000 wells/cm2, 50000 wells/cm2, or 100000 wells/cm2. In some cases, the well density may be less than 10 wells/cm2, 50 wells/cm2, 100 wells/cm2, 500 wells/cm2, 1000 wells/cm2, 5000 wells/cm2, 10000 wells/cm2, 50000 wells/cm2, or 100000 wells/cm2.
b. Spots as Partitions
In some cases, spots are used as partitions. With reference to
In one example, reagents for sample processing are dispensed directly onto a spot, for example on a glass slide, and overlaid with a layer that is dissolvable, meltable, or permeable. A sample comprising an analyte to be processed is introduced on top of the layer. The layer is dissolved or melted, or the analyte (or reagent) diffuses through the layer. The spot is sealed and incubated under appropriate conditions for the processing of the analyte. Processed analyte may then be recovered.
As described elsewhere in this disclosure (e.g., Table 1), spots may also be arranged within a well. In some cases, a plurality of spots may be arranged within a well such that the contents of each spot do not mix. Such a configuration may be useful, for example, when it is desirable to prevent species from contacting each other. In some cases, a well may comprise 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, or more spots. In some cases, a well may comprise at least 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, or more spots. In some cases, a well may comprise less than 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 spots. In some cases, a well may comprise 2-4, 2-6, 2-8, 4-6, 4-8, 5-10, or 4-12 spots. Upon addition of a substance (e.g., a medium containing an analyte) to the well, the species in the spot may mix. Moreover, using separate spots to contain different species (or combinations of species) may also be useful to prevent cross-contamination of devices used to place the spots inside the well.
In some cases, spots comprise other partitions. A spot may comprise any suitable partition including, for example, with reference to
In one example, a spot comprises a capsule comprising reagents for sample processing. As described elsewhere in this disclosure, a capsule may contain one or more capsules, or other partitions. A sample comprising an analyte to be processed is introduced into the spot. The spot is sealed and a stimulus is applied to cause release of the contents of the capsule into the spot, resulting in contact between the reagents and the analyte to be processed. The spot is incubated under appropriate conditions for the processing of the analyte. Processed analyte may then be recovered. While this example describes an embodiment where a reagent is in a capsule and an analyte is in the spot, the opposite configuration—i.e., reagent in the spot and analyte in the capsule—is also possible.
In another example, a spot comprises an emulsion and the droplets of the emulsion comprise capsules comprising reagents for sample processing. A sample comprising an analyte to be processed is contained within the droplets of the emulsion. The spot is sealed and a stimulus is applied to cause release of the contents of the capsules into the droplets, resulting in contact between the reagents and the analyte to be processed. The spot is incubated under appropriate conditions for the processing of the analyte. Processed analyte may then be recovered. While this example describes an embodiment where a reagent is in a capsule and an analyte is in a droplet, the opposite configuration—i.e., reagent in the droplet and analyte in the capsule—is also possible.
Spots may be of uniform size or heterogeneous size. In some cases, the diameter of a spot may be about 0.1 μm, 0.5 μm, 1 μm, 5 μm, 10 μm, 50 μm, 100 μm, 150 μm, 200 μm, 300 μm, 400 μm, 500 μm, 600 μm, 700 μm, 800 μm, 900 μm, 1 mm, 2 mm, 5 mm, or 1 cm. A spot may have a diameter of at least about 0.1 μm, 0.5 μm, 1 μm, 5 μm, 10 μm, 50 μm, 100 μm, 150 μm, 200 μm, 300 μm, 400 μm, 500 μm, 600 μm, 700 μm, 800 μm, 900 μm, 1 mm, 1 mm, 2 mm, 5 mm, or 1 cm. In some cases, a spot may have a diameter of less than about 0.1 μm, 0.5 μm, 1 μm, 5 μm, 10 μm, 50 μm, 100 μm, 150 μm, 200 μm, 300 μm, 400 μm, 500 μm, 600 μm, 700 μm, 800 μm, 900 μm, 1 mm, 1 mm, 2 mm, 5 mm, or 1 cm. In some cases, a spot may have a diameter of about 0.1 μm to 1 cm, 100 μm to 1 mm, 100 μm to 500 μm, 100 μm to 600 μm, 150 μm to 300 μm, or 150 μm to 400 μm.
Spots may be arranged as an array, for example a spot array. Based on the dimensions of individual spots and the size of the substrate, the spot array may comprise a range of spot densities. In some cases, the spot density may be 10 spots/cm2, 50 spots/cm2, 100 spots/cm2, 500 spots/cm2, 1000 spots/cm2, 5000 spots/cm2, 10000 spots/cm2, 50000 spots/cm2, or 100000 spots/cm2. In some cases, the spot density may be at least 10 spots/cm2, 50 spots/cm2, 100 spots/cm2, 500 spots/cm2, 1000 spots/cm2, 5000 spots/cm2, 10000 spots/cm2, 50000 spots/cm2, or 100000 spots/cm2. In some cases, the spot density may be less than 10 spots/cm2, 50 spots/cm2, 100 spots/cm2, 500 spots/cm2, 1000 spots/cm2, 5000 spots/cm2, 10000 spots/cm2, 50000 spots/cm2, or 100000 spots/cm2.
c. Emulsions as Partitions
In some cases, the droplets in an emulsion are used as partitions. An emulsion may be prepared, for example, by any suitable method, including methods known in the art. (See e.g., Weizmann et al., Nature Methods, 2006, 3(7):545-550; Weitz et al. U.S. Pub. No. 2012/0211084). In some cases, water-in-fluorocarbon emulsions may be used. These emulsions may incorporate fluorosurfactants such as oligomeric perfluorinated polyethers (PFPE) with polyethylene glycol (PEG). (Holtze et al., Lab on a Chip, 2008, 8(10):1632-1639). In some cases, monodisperse emulsions may be formed in a microfluidic flow focusing device. (Garstecki et al., Applied Physics Letters, 2004, 85(13):2649-2651).
In some cases, droplets in an emulsion comprise other partitions. A droplet in an emulsion may comprise any suitable partition including, for example, with reference to
In one example, a droplet in an emulsion comprises a capsule comprising reagents for sample processing. As described elsewhere in this disclosure, a capsule may contain one or more capsules, or other partitions. A sample comprising an analyte to be processed is contained within the droplet. A stimulus is applied to cause release of the contents of the capsule into the droplet, resulting in contact between the reagents and the analyte to be processed. The droplet is incubated under appropriate conditions for the processing of the analyte. Processed analyte may then be recovered. While this example describes an embodiment where a reagent is in a capsule and an analyte is in the droplet, the opposite configuration—i.e., reagent in the droplet and analyte in the capsule—is also possible.
The droplets in an emulsion may be of uniform size or heterogeneous size. In some cases, the diameter of a droplet in an emulsion may be about 0.001 μm, 0.01 μm, 0.05 μm, 0.1 μm, 0.5 μm, 1 μm, 5 μm, 10 μm, 50 μm, 100 μm, 150 μm, 200 μm, 300 μm, 400 μm, 500 μm, 600 μm, 700 μm, 800 μm, 900 μm, or 1 mm. A droplet may have a diameter of at least about 0.001 μm, 0.01 μm, 0.05 μm, 0.1 μm, 0.5 μm, 1 μm, 5 μm, 10 μm, 50 μm, 100 μm, 150 μm, 200 μm, 300 μm, 400 μm, 500 μm, 600 μm, 700 μm, 800 μm, 900 μm, or 1 mm. In some cases, a droplet may have a diameter of less than about 0.001 μm, 0.01 μm, 0.05 μm, 0.1 μm, 0.5 μm, 1 μm, 5 μm, 10 μm, 50 μm, 100 μm, 150 μm, 200 μm, 300 μm, 400 μm, 500 μm, 600 μm, 700 μm, 800 μm, 900 μm, or 1 mm. In some cases, a droplet may have a diameter of about 0.001 μm to 1 mm, 0.01 μm to 900 μm, 0.1 μm to 600 μm, 100 μm to 200 μm, 100 μm to 300 μm, 100 μm to 400 μm, 100 μm to 500 μm, 100 μm to 600 μm, 150 μm to 200 μm, 150 μm to 300 μm, or 150 μm to 400 μm.
Droplets in an emulsion also may have a particular density. In some cases, the droplets are less dense than an aqueous fluid (e.g., water); in some cases, the droplets are denser than an aqueous fluid. In some cases, the droplets are less dense than a non-aqueous fluid (e.g., oil); in some cases, the droplets are denser than a non-aqueous fluid. Droplets may have a density of about 0.05 g/cm3, 0.1 g/cm3, 0.2 g/cm3, 0.3 g/cm3, 0.4 g/cm3, 0.5 g/cm3, 0.6 g/cm3, 0.7 g/cm3, 0.8 g/cm3, 0.81 g/cm3, 0.82 g/cm3, 0.83 g/cm3, 0.84 g/cm3, 0.85 g/cm3, 0.86 g/cm3, 0.87 g/cm3, 0.88 g/cm3, 0.89 g/cm3, 0.90 g/cm3, 0.91 g/cm3, 0.92 g/cm3, 0.93 g/cm3, 0.94 g/cm3, 0.95 g/cm3, 0.96 g/cm3, 0.97 g/cm3, 0.98 g/cm3, 0.99 g/cm3, 1.00 g/cm3, 1.05 g/cm3, 1.1 g/cm3, 1.2 g/cm3, 1.3 g/cm3, 1.4 g/cm3, 1.5 g/cm3, 1.6 g/cm3, 1.7 g/cm3, 1.8 g/cm3, 1.9 g/cm3, 2.0 g/cm3, 2.1 g/cm3, 2.2 g/cm3, 2.3 g/cm3, 2.4 g/cm3, or 2.5 g/cm3. Droplets may have a density of at least about 0.05 g/cm3, 0.1 g/cm3, 0.2 g/cm3, 0.3 g/cm3, 0.4 g/cm3, 0.5 g/cm3, 0.6 g/cm3, 0.7 g/cm3, 0.8 g/cm3, 0.81 g/cm3, 0.82 g/cm3, 0.83 g/cm3, 0.84 g/cm3, 0.85 g/cm3, 0.86 g/cm3, 0.87 g/cm3, 0.88 g/cm3, 0.89 g/cm3, 0.90 g/cm3, 0.91 g/cm3, 0.92 g/cm3, 0.93 g/cm3, 0.94 g/cm3, 0.95 g/cm3, 0.96 g/cm3, 0.97 g/cm3, 0.98 g/cm3, 0.99 g/cm3, 1.00 g/cm3, 1.05 g/cm3, 1.1 g/cm3, 1.2 g/cm3, 1.3 g/cm3, 1.4 g/cm3, 1.5 g/cm3, 1.6 g/cm3, 1.7 g/cm3, 1.8 g/cm3, 1.9 g/cm3, 2.0 g/cm3, 2.1 g/cm3, 2.2 g/cm3, 2.3 g/cm3, 2.4 g/cm3, or 2.5 g/cm3. In other cases, droplet densities may be at most about 0.7 g/cm3, 0.8 g/cm3, 0.81 g/cm3, 0.82 g/cm3, 0.83 g/cm3, 0.84 g/cm3, 0.85 g/cm3, 0.86 g/cm3, 0.87 g/cm3, 0.88 g/cm3, 0.89 g/cm3, 0.90 g/cm3, 0.91 g/cm3, 0.92 g/cm3, 0.93 g/cm3, 0.94 g/cm3, 0.95 g/cm3, 0.96 g/cm3, 0.97 g/cm3, 0.98 g/cm3, 0.99 g/cm3, 1.00 g/cm3, 1.05 g/cm3, 1.1 g/cm3, 1.2 g/cm3, 1.3 g/cm3, 1.4 g/cm3, 1.5 g/cm3, 1.6 g/cm3, 1.7 g/cm3, 1.8 g/cm3, 1.9 g/cm3, 2.0 g/cm3, 2.1 g/cm3, 2.2 g/cm3, 2.3 g/cm3, 2.4 g/cm3, or 2.5 g/cm3. Such densities can reflect the density of the capsule in any particular fluid (e.g., aqueous, water, oil, etc.)
d. Capsules as Partitions
In some cases, capsules are used as partitions. With reference to
In some cases, capsules comprise other partitions. A capsule may comprise any suitable partition including, for example, with reference to
In one example, an outer capsule comprises an inner capsule. The inner capsule comprises reagents for sample processing. An analyte is encapsulated in the medium between the inner capsule and the outer capsule. A stimulus is applied to cause release of the contents of the inner capsule into the outer capsule, resulting in contact between the reagents and the analyte to be processed. The outer capsule is incubated under appropriate conditions for the processing of the analyte. Processed analyte may then be recovered. While this example describes an embodiment where a reagent is in an inner capsule and an analyte in the medium between the inner capsule and the outer capsule, the opposite configuration—i.e., reagent in the medium between the inner capsule and the outer capsule, and analyte in the inner capsule—is also possible.
Capsules may be pre-formed and filled with reagents by injection. For example, the picoinjection methods described in Abate et al. (Proc. Natl. Acad. Sci. U.S.A., 2010, 107(45), 19163-19166) and Weitz et al. (U.S. Pub. No. 2012/0132288) may be used to introduce reagents into the interior of capsules described herein. Generally, the picoinjection will be performed prior to the hardening of the capsule shell, for example by injecting species into the interior of a capsule precursor, such as a droplet of an emulsion, before formation of the capsule shell.
Capsules may be of uniform size or heterogeneous size. In some cases, the diameter of a capsule may be about 0.001 μm, 0.01 μm, 0.05 μm, 0.1 μm, 0.5 μm, 1 μm, 5 μm, 10 μm, 50 μm, 100 μm, 150 μm, 200 μm, 300 μm, 400 μm, 500 μm, 600 μm, 700 μm, 800 μm, 900 μm, or 1 mm. A capsule may have a diameter of at least about 0.001 μm, 0.01 μm, 0.05 μm, 0.1 μm, 0.5 μm, 1 μm, 5 μm, 10 μm, 50 μm, 100 μm, 150 μm, 200 μm, 300 μm, 400 μm, 500 μm, 600 μm, 700 μm, 800 μm, 900 μm, or 1 mm. In some cases, a capsule may have a diameter of less than about 0.001 μm, 0.01 μm, 0.05 μm, 0.1 μm, 0.5 μm, 1 μm, 5 μm, 10 μm, 50 μm, 100 μm, 150 μm, 200 μm, 300 μm, 400 μm, 500 μm, 600 μm, 700 μm, 800 μm, 900 μm, or 1 mm. In some cases, a capsule may have a diameter of about 0.001 μm to 1 mm, 0.01 μm to 900 μm, 0.1 μm to 600 μm, 100 μm to 200 μm, 100 μm to 300 μm, 100 μm to 400 μm, 100 μm to 500 μm, 100 μm to 600 μm, 150 μm to 200 μm, 150 μm to 300 μm, or 150 μm to 400 μm.
Capsules also may have a particular density. In some cases, the capsules are less dense than an aqueous fluid (e.g., water); in some cases, the capsules are denser than an aqueous fluid. In some cases, the capsules are less dense than a non-aqueous fluid (e.g., oil); in some cases, the capsules are denser than a non-aqueous fluid. Capsules may have a density of about 0.05 g/cm3, 0.1 g/cm3, 0.2 g/cm3, 0.3 g/cm3, 0.4 g/cm3, 0.5 g/cm3, 0.6 g/cm3, 0.7 g/cm3, 0.8 g/cm3, 0.81 g/cm3, 0.82 g/cm3, 0.83 g/cm3, 0.84 g/cm3, 0.85 g/cm3, 0.86 g/cm3, 0.87 g/cm3, 0.88 g/cm3, 0.89 g/cm3, 0.90 g/cm3, 0.91 g/cm3, 0.92 g/cm3, 0.93 g/cm3, 0.94 g/cm3, 0.95 g/cm3, 0.96 g/cm3, 0.97 g/cm3, 0.98 g/cm3, 0.99 g/cm3, 1.00 g/cm3, 1.05 g/cm3, 1.1 g/cm3, 1.2 g/cm3, 1.3 g/cm3, 1.4 g/cm3, 1.5 g/cm3, 1.6 g/cm3, 1.7 g/cm3, 1.8 g/cm3, 1.9 g/cm3, 2.0 g/cm3, 2.1 g/cm3, 2.2 g/cm3, 2.3 g/cm3, 2.4 g/cm3, or 2.5 g/cm3. Capsules may have a density of at least about 0.05 g/cm3, 0.1 g/cm3, 0.2 g/cm3, 0.3 g/cm3, 0.4 g/cm3, 0.5 g/cm3, 0.6 g/cm3, 0.7 g/cm3, 0.8 g/cm3, 0.81 g/cm3, 0.82 g/cm3, 0.83 g/cm3, 0.84 g/cm3, 0.85 g/cm3, 0.86 g/cm3, 0.87 g/cm3, 0.88 g/cm3, 0.89 g/cm3, 0.90 g/cm3, 0.91 g/cm3, 0.92 g/cm3, 0.93 g/cm3, 0.94 g/cm3, 0.95 g/cm3, 0.96 g/cm3, 0.97 g/cm3, 0.98 g/cm3, 0.99 g/cm3, 1.00 g/cm3, 1.05 g/cm3, 1.1 g/cm3, 1.2 g/cm3, 1.3 g/cm3, 1.4 g/cm3, 1.5 g/cm3, 1.6 g/cm3, 1.7 g/cm3, 1.8 g/cm3, 1.9 g/cm3, 2.0 g/cm3, 2.1 g/cm3, 2.2 g/cm3, 2.3 g/cm3, 2.4 g/cm3, or 2.5 g/cm3. In other cases, capsule densities may be at most about 0.7 g/cm3, 0.8 g/cm3, 0.81 g/cm3, 0.82 g/cm3, 0.83 g/cm3, 0.84 g/cm3, 0.85 g/cm3, 0.86 g/cm3, 0.87 g/cm3, 0.88 g/cm3, 0.89 g/cm3, 0.90 g/cm3, 0.91 g/cm3, 0.92 g/cm3, 0.93 g/cm3, 0.94 g/cm3, 0.95 g/cm3, 0.96 g/cm3, 0.97 g/cm3, 0.98 g/cm3, 0.99 g/cm3, 1.00 g/cm3, 1.05 g/cm3, 1.1 g/cm3, 1.2 g/cm3, 1.3 g/cm3, 1.4 g/cm3, 1.5 g/cm3, 1.6 g/cm3, 1.7 g/cm3, 1.8 g/cm3, 1.9 g/cm3, 2.0 g/cm3, 2.1 g/cm3, 2.2 g/cm3, 2.3 g/cm3, 2.4 g/cm3, or 2.5 g/cm3. Such densities can reflect the density of the capsule in any particular fluid (e.g., aqueous, water, oil, etc.)
1. Production of Capsules by Flow Focusing
In some cases, capsules may be produced by flow focusing. Flow focusing is a method whereby a first fluid that is immiscible with a second fluid is flowed into the second fluid. With reference to
A species, or other partition such as a droplet, may be encapsulated by, for example, including the species in the first fluid. Including the species in the second fluid may embed the species in the shell of the capsule. Of course, depending on the needs of the particular sample processing method, the phases may also be reversed—i.e., the first phase may be an oil phase and the second phase may be an aqueous phase.
2. Production of Capsules Within Capsules by Flow Focusing
In some cases, capsules within capsules may be produced by flow focusing. With reference to
A species may be encapsulated by, for example, including the species in the first fluid. Including the species in the second fluid may embed the species in the second shell of the capsule. Of course, depending on the needs of the particular sample processing method, the phases may also be reversed—i.e., the first phase may be an oil phase and the second phase may be an aqueous phase.
3. Production of Capsules in Batch
In some cases, capsules may be produced in batch, using capsule precursors, such as the droplets in an emulsion. With reference to
In another example, the droplets of an emulsion may be exposed to an accelerator that is present in an outlet well during the emulsion generation process. For example, capsule precursors may be formed by any suitable method, such as the flow focusing method illustrated in
The methods, compositions, systems, devices, and kits of this disclosure may be used with any suitable species. A species can be, for example, any substance used in sample processing, such as a reagent or an analyte. Exemplary species include whole cells, chromosomes, polynucleotides, organic molecules, proteins, polypeptides, carbohydrates, saccharides, sugars, lipids, enzymes, restriction enzymes, ligases, polymerases, barcodes, adapters, small molecules, antibodies, fluorophores, deoxynucleotide triphosphates (dNTPs), dideoxynucleotide triphosphates (ddNTPs), buffers, acidic solutions, basic solutions, temperature-sensitive enzymes, pH-sensitive enzymes, light-sensitive enzymes, metals, metal ions, magnesium chloride, sodium chloride, manganese, aqueous buffer, mild buffer, ionic buffer, inhibitors, saccharides, oils, salts, ions, detergents, ionic detergents, non-ionic detergents, oligonucleotides, nucleotides, DNA, RNA, peptide polynucleotides, complementary DNA (cDNA), double stranded DNA (dsDNA), single stranded DNA (ssDNA), plasmid DNA, cosmid DNA, chromosomal DNA, genomic DNA, viral DNA, bacterial DNA, mtDNA (mitochondrial DNA), mRNA, rRNA, tRNA, nRNA, siRNA, snRNA, snoRNA, scaRNA, microRNA, dsRNA, ribozyme, riboswitch and viral RNA, a locked nucleic acid (LNA) in whole or part, locked nucleic acid nucleotides, any other type of nucleic acid analogue, proteases, nucleases, protease inhibitors, nuclease inhibitors, chelating agents, reducing agents, oxidizing agents, probes, chromophores, dyes, organics, emulsifiers, surfactants, stabilizers, polymers, water, small molecules, pharmaceuticals, radioactive molecules, preservatives, antibiotics, aptamers, and the like. In summary, the species that are used will vary depending on the particular sample processing needs.
In some cases, a partition comprises a set of species that have a similar attribute (e.g., a set of enzymes, a set of minerals, a set of oligonucleotides, a mixture of different barcodes, a mixture of identical barcodes). In other cases, a partition comprises a heterogeneous mixture of species. In some cases, the heterogeneous mixture of species comprises all components necessary to perform a particular reaction. In some cases, such mixture comprises all components necessary to perform a reaction, except for 1, 2, 3, 4, 5, or more components necessary to perform the reaction. In some cases, such additional components are contained within a different partition or within a solution within or surrounding a partition.
A species may be naturally-occurring or synthetic. A species may be present in a sample obtained using any methods known in the art. In some cases, a sample may be processed before analyzing it for an analyte.
A species may be obtained from any suitable location, including from organisms, whole cells, cell preparations and cell-free compositions from any organism, tissue, cell, or environment. A species may be obtained from environmental samples, biopsies, aspirates, formalin fixed embedded tissues, air, agricultural samples, soil samples, petroleum samples, water samples, or dust samples. In some instances, a species may be obtained from bodily fluids which may include blood, urine, feces, serum, lymph, saliva, mucosal secretions, perspiration, central nervous system fluid, vaginal fluid, or semen. Species may also be obtained from manufactured products, such as cosmetics, foods, personal care products, and the like. Species may be the products of experimental manipulation including, recombinant cloning, polynucleotide amplification, polymerase chain reaction (PCR) amplification, purification methods (such as purification of genomic DNA or RNA), and synthesis reactions.
In some cases, a species may quantified by mass. A species may be provided in a mass of about 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 50, 100, 500, 1000, 1500, 2000, 2500, 3000, 3500, 4000, 4500, 5000, 5500, 6000, 6500, 7000, 7500, 8000, 8500, 9000, 9500, 10000 ng, 1 μg, 5 μg, 10 μg, 15 μg, or 20 μg. A species may be provided in a mass of at least about 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 50, 100, 500, 1000, 1500, 2000, 2500, 3000, 3500, 4000, 4500, 5000, 5500, 6000, 6500, 7000, 7500, 8000, 8500, 9000, 9500, 10000 ng, 1 μg, 5 μg, 10 μg, 15 μg, or 20 μg. A species may be provided in a mass of less than about 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 50, 100, 500, 1000, 1500, 2000, 2500, 3000, 3500, 4000, 4500, 5000, 5500, 6000, 6500, 7000, 7500, 8000, 8500, 9000, 9500, 10000 ng 1 μg, 5 μg, 10 μg, 15 μg, or 20 μg. A species may be provided in a mass ranging from about 1-10, 10-50, 50-100, 100-200, 200-1000, 1000-10000 ng, 1-5 μg, or 1-20 μg. As described elsewhere in this disclosure, if a species is a polynucleotide, amplification may be used to increase the quantity of a polynucleotide.
Polynucleotides may also be quantified as “genome equivalents.” A genome equivalent is an amount of polynucleotide equivalent to one haploid genome of an organism from which the target polynucleotide is derived. For example, a single diploid cell contains two genome equivalents of DNA. Polynucleotides may be provided in an amount ranging from about 1-10, 10-50, 50-100, 100-1000, 1000-10000, 10000-100000, or 100000-1000000 genome equivalents. Polynucleotides may be provided in an amount of at least about 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 50, 100, 500, 1000, 1500, 2000, 2500, 3000, 3500, 4000, 4500, 5000, 5500, 6000, 6500, 7000, 7500, 8000, 8500, 9000, 9500, 10000, 20000, 30000, 40000, 50000, 60000 70000, 80000, 90000, 100000, 200000, 300000, 400000, 500000, 600000, 700000, 800000, 900000, or 1000000 genome equivalents. Polynucleotides may be provided in an amount less than about 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 50, 100, 500, 1000, 1500, 2000, 2500, 3000, 3500, 4000, 4500, 5000, 5500, 6000, 6500, 7000, 7500, 8000, 8500, 9000, 9500, 10000, 20000, 30000, 40000, 50000, 60000 70000, 80000, 90000, 100000, 200000, 300000, 400000, 500000, 600000, 700000, 800000, 900000, or 1000000 genome equivalents.
Polynucleotides may also be quantified by the amount of sequence coverage provided. The amount of sequence coverage refers to the average number of reads representing a given nucleotide in a reconstructed sequence. Generally, the greater the number of times a region is sequenced, the more accurate the sequence information obtained. Polynucleotides may be provided in an amount that provides a range of sequence coverage from about 0.1×-10×, 10-×-50×, 50×-100×, 100×-200×, or 200×-500×. Polynucleotides may be provided in an amount that provides at least about 0.1×, 0.2×, 0.3×, 0.4×, 0.5×, 0.6×, 0.7×, 0.8×, 0.9×, 1.0×, 5×, 10×, 25×, 50×, 100×, 125×, 150×, 175×, or 200× sequence coverage. Polynucleotides may be provided in an amount that provides less than about 0.2×, 0.3×, 0.4×, 0.5×, 0.6×, 0.7×, 0.8×, 0.9×, 1.0×, 5×, 10×, 25×, 50×, 100×, 125×, 150×, 175×, or 200× sequence coverage.
In some cases, species are introduced into a partition either before or after a particular step. For example, a lysis buffer reagent may be introduced into a partition following partitioning of a cellular sample into the partitions. In some cases, reagents and/or partitions comprising reagents are introduced sequentially such that different reactions or operations occur at different steps. The reagents (or partitions comprising reagents) may be also be loaded at steps interspersed with a reaction or operation step. For example, capsules comprising reagents for fragmenting molecules (e.g., nucleic acids) may be loaded into a well, followed by a fragmentation step, which may be followed by loading of capsules comprising reagents for ligating barcodes (or other unique identifiers, e.g., antibodies) and subsequent ligation of the barcodes to the fragmented molecules.
In some cases, the methods, compositions, systems, devices, and kits of this disclosure may be used to process a sample containing a species, for example an analyte. Any suitable process can be performed.
a. Fragmentation of Target Polynucleotides
In some cases, the methods, compositions, systems, devices, and kits of this disclosure may be used for polynucleotide fragmentation. Fragmentation of polynucleotides is used as a step in a variety of methods, including polynucleotide sequencing. The size of the polynucleotide fragments, typically described in terms of length (quantified by the linear number of nucleotides per fragment), may vary depending on the source of the target polynucleotide, the method used for fragmentation, and the desired application. A single fragmentation step or a plurality of fragmentation steps may be used.
Fragments generated using the methods described herein may be about 1-10, 10-20, 20-50, 50-100, 50-200, 100-200, 200-300, 300-400, 400-500, 500-1000, 1000-5000, 5000-10000, 10000-100000, 100000-250000, or 250000-500000 nucleotides in length. Fragments generated using the methods described herein may be at least about 10, 20, 100, 200, 300, 400, 500, 1000, 5000, 10000, 100000, 250000, 500000, or more nucleotides in length. Fragments generated using the methods described herein may be less than about 10, 20, 100, 200, 300, 400, 500, 1000, 5000, 10000, 100000, 250000, 500000, nucleotides in length.
Fragments generated using the methods described herein may have a mean or median length of about 1-10, 10-20, 20-50, 50-100, 50-200, 100-200, 200-300, 300-400, 400-500, 500-1000, 1000-5000, 5000-10000, 10000-100000, 100000-250000, or 250000-500000 nucleotides. Fragments generated using the methods described herein may have a mean or median length of at least about 10, 20, 100, 200, 300, 400, 500, 1000, 5000, 10000, 100000, 250000, 500000, or more nucleotides. Fragments generated using the methods described herein may have a mean or median length of less than about 10, 20, 100, 200, 300, 400, 500, 1000, 5000, 10000, 100000, 250000, 500000, nucleotides.
Numerous fragmentation methods are known in the art. For example, fragmentation may be performed through physical, mechanical or enzymatic methods. Physical fragmentation may include exposing a target polynucleotide to heat or to UV light. Mechanical disruption may be used to mechanically shear a target polynucleotide into fragments of the desired range. Mechanical shearing may be accomplished through a number of methods known in the art, including repetitive pipetting of the target polynucleotide, sonication (e.g., using ultrasonic waves), cavitation and nebulization. Target polynucleotides may also be fragmented using enzymatic methods. In some cases, enzymatic digestion may be performed using enzymes such as using restriction enzymes.
While the methods of fragmentation described in the preceding paragraph, and in some paragraphs of the disclosure, are described with reference to “target” polynucleotides, this is not meant to be limiting, above or anywhere else in this disclosure. Any method of fragmentation described herein, or known in the art, can be applied to any polynucleotide used with the invention. In some cases, this polynucleotide may be a target polynucleotide, such as a genome. In other cases, this polynucleotide may be a fragment of a target polynucleotide which one wishes to further fragment. In still other cases, still further fragments may be still further fragmented. Any suitable polynucleotide may be fragmented according the methods described herein.
Restriction enzymes may be used to perform specific or non-specific fragmentation of target polynucleotides. The methods of the present disclosure may use one or more types of restriction enzymes, generally described as Type I enzymes, Type II enzymes, and/or Type III enzymes. Type II and Type III enzymes are generally commercially available and well known in the art. Type II and Type III enzymes recognize specific sequences of nucleotide base pairs within a double stranded polynucleotide sequence (a “recognition sequence” or “recognition site”). Upon binding and recognition of these sequences, Type II and Type III enzymes cleave the polynucleotide sequence. In some cases, cleavage will result in a polynucleotide fragment with a portion of overhanging single stranded DNA, called a “sticky end.” In other cases, cleavage will not result in a fragment with an overhang, creating a “blunt end.” The methods of the present disclosure may comprise use of restriction enzymes that generate either sticky ends or blunt ends.
Restriction enzymes may recognize a variety of recognition sites in the target polynucleotide. Some restriction enzymes (“exact cutters”) recognize only a single recognition site (e.g., GAATTC). Other restriction enzymes are more promiscuous, and recognize more than one recognition site, or a variety of recognition sites. Some enzymes cut at a single position within the recognition site, while others may cut at multiple positions. Some enzymes cut at the same position within the recognition site, while others cut at variable positions.
The present disclosure provides method of selecting one or more restriction enzymes to produce fragments of a desired length. Polynucleotide fragmentation may be simulated in silico, and the fragmentation may be optimized to obtain the greatest number or fraction of polynucleotide fragments within a particular size range, while minimizing the number or fraction of fragments within undesirable size ranges. Optimization algorithms may be applied to select a combination of two or more enzymes to produce the desired fragment sizes with the desired distribution of fragments quantities.
A polynucleotide may be exposed to two or more restriction enzymes simultaneously or sequentially. This may be accomplished by, for example, adding more than one restriction enzyme to a partition, or by adding one restriction enzyme to a partition, performing the digestion, deactivating the restriction enzyme (e.g., by heat treatment) and then adding a second restriction enzyme. Any suitable restriction enzyme may be used alone, or in combination, in the methods presented herein.
In some cases, a species is a restriction enzyme that is a “rare-cutter.” The term “rare-cutter enzyme,” as used herein, generally refers to an enzyme with a recognition site that occurs only rarely in a genome. The size of restriction fragments generated by cutting a hypothetical random genome with a restriction enzyme may be approximated by 4N, where N is the number of nucleotides in the recognition site of the enzyme. For example, an enzyme with a recognition site consisting of 7 nucleotides would cut a genome once every 47 bp, producing fragments of about 16,384 bp. Generally rare-cutter enzymes have recognition sites comprising 6 or more nucleotides. For example, a rare cutter enzyme may have a recognition site comprising or consisting of 6, 7, 8, 9, 10, 11, 12, 13, 14, or 15 nucleotides. Examples of rare-cutter enzymes include NotI (GCGGCCGC), XmaIII (CGGCCG), SstII (CCGCGG), SalI (GTCGAC), NruI (TCGCGA), NheI (GCTAGC), Nb.BbvCI (CCTCAGC), BbvCI (CCTCAGC), AscI (GGCGCGCC), AsiSI (GCGATCGC), FseI (GGCCGGCC), PacI (TTAATTAA), PmeI (GTTTAAAC), SbfI (CCTGCAGG), SgrAI (CRCCGGYG), SwaI (ATTTAAAT), BspQI (GCTCTTC), SapI (GCTCTTC), SfiI (GGCCNNNNNGGCC), CspCI (CAANNNNNGTGG), AbsI (CCTCGAGG), CciNI (GCGGCCGC), FspAI (RTGCGCAY), MauBI (CGCGCGCG), MreI (CGCCGGCG), MssI (GTTTAAAC), PalAI (GGCGCGCC), RgaI (GCGATCGC), RigI (GGCCGGCC), SdaI (CCTGCAGG), SfaAI (GCGATCGC), SgfI (GCGATCGC), SgrDI (CGTCGACG), SgsI (GGCGCGCC), SmiI (ATTTAAAT), SrfI (GCCCGGGC), Sse2321 (CGCCGGCG), Sse83871 (CCTGCAGG), LguI (GCTCTTC), PciSI (GCTCTTC), AarI (CACCTGC), AjuI (GAANNNNNNNTTGG), AloI (GAACNNNNNNTCC), BarI (GAAGNNNNNNTAC), PpiI (GAACNNNNNCTC), PsrI (GAACNNNNNNTAC), and others.
In some cases, polynucleotides may be fragmented and barcoded at the same time. For example, a transposase (e.g., NEXTERA) may be used to fragment a polynucleotide and add a barcode to the polynucleotide.
b. Barcoding
Certain downstream applications, for example polynucleotide sequencing, may rely on the barcodes to identify the origin of a sequence and, for example, to assemble a larger sequence from sequenced fragments. Therefore, it may be desirable to add barcodes to polynucleotide fragments before sequencing. Barcodes may be of a variety of different formats, including polynucleotide barcodes. Depending upon the specific application, barcodes may be attached to polynucleotide fragments in a reversible or irreversible manner. Barcodes may also allow for identification and/or quantification of individual polynucleotide fragments during sequencing.
Barcodes may be loaded into partitions so that one or more barcodes are introduced into a particular partition. Each partition may contain a different set of barcodes. In some cases, each different set of barcodes may comprise a set of identical barcodes. This may be accomplished by directly dispensing the barcodes into the partitions, or by placing the barcodes within a partition within a partition.
The number of different barcodes or different sets of barcodes that are partitioned may vary depending upon, for example, the particular barcodes to be partitioned and/or the application. Different sets of barcodes may be, for example, sets of identical barcodes where the identical barcodes differ between each set. Or different sets of barcodes may be, for example, sets of different barcodes, where each set differs in its included barcodes. For example, about 1, 5, 10, 50, 100, 1000, 10000, 20,000, 30,000, 40,000, 50,000, 60,000, 70,000, 80,000, 90,000, 100000, 200,000, 300,000, 400,000, 500,000, 600,000, 700,000, 800,000, 900,000, 1000000, 2000000, 3000000, 4000000, 5000000, 6000000, 7000000, 8000000, 9000000, 10000000, 20000000, 50000000, 100000000, or more different barcodes or different sets of barcodes may be partitioned. In some examples, at least about 1, 5, 10, 50, 100, 1000, 10000, 20000, 30000, 40000, 50000, 60000, 70000, 80000, 90000, 100000, 200,000, 300,000, 400,000, 500,000, 600,000, 700,000, 800,000, 900,000, 1000000, 2000000, 3000000, 4000000, 5000000, 6000000, 7000000, 8000000, 9000000, 10000000, 20000000, 50000000, 100000000, or more different barcodes or different sets of barcodes may be partitioned. In some examples, less than about 1, 5, 10, 50, 100, 1000, 10000, 20000, 30000, 40000, 50000, 60000, 70000, 80000, 90000, 100000, 200,000, 300,000, 400,000, 500,000, 600,000, 700,000, 800,000, 900,000, 1000000, 2000000, 3000000, 4000000, 5000000, 6000000, 7000000, 8000000, 9000000, 10000000, 20000000, 50000000, or 100000000 different barcodes or different sets of barcodes may be partitioned. In some examples, about 1-5, 5-10, 10-50, 50-100, 100-1000, 1000-10000, 10000-100000, 100000-1000000, 10000-1000000, 10000-10000000, or 10000-100000000 barcodes may be partitioned.
Barcodes may be partitioned at a particular density. For example, barcodes may be partitioned so that each partition contains about 1, 5, 10, 50, 100, 1000, 10000, 20,000, 30,000, 40,000, 50,000, 60,000, 70,000, 80,000, 90,000, 100000, 200,000, 300,000, 400,000, 500,000, 600,000, 700,000, 800,000, 900,000, 1000000, 2000000, 3000000, 4000000, 5000000, 6000000, 7000000, 8000000, 9000000, 10000000, 20000000, 50000000, or 100000000 barcodes per partition. Barcodes may be partitioned so that each partition contains at least about 1, 5, 10, 50, 100, 1000, 10000, 20000, 30000, 40000, 50000, 60000, 70000, 80000, 90000, 100000, 200,000, 300,000, 400,000, 500,000, 600,000, 700,000, 800,000, 900,000, 1000000, 2000000, 3000000, 4000000, 5000000, 6000000, 7000000, 8000000, 9000000, 10000000, 20000000, 50000000, 100000000, or more barcodes per partition. Barcodes may be partitioned so that each partition contains less than about 1, 5, 10, 50, 100, 1000, 10000, 20000, 30000, 40000, 50000, 60000, 70000, 80000, 90000, 100000, 200,000, 300,000, 400,000, 500,000, 600,000, 700,000, 800,000, 900,000, 1000000, 2000000, 3000000, 4000000, 5000000, 6000000, 7000000, 8000000, 9000000, 10000000, 20000000, 50000000, or 100000000 barcodes per partition. Barcodes may be partitioned such that each partition contains about 1-5, 5-10, 10-50, 50-100, 100-1000, 1000-10000, 10000-100000, 100000-1000000, 10000-1000000, 10000-10000000, or 10000-100000000 barcodes per partition.
Barcodes may be partitioned such that identical barcodes are partitioned at a particular density. For example, identical barcodes may be partitioned so that each partition contains about 1, 5, 10, 50, 100, 1000, 10000, 20,000, 30,000, 40,000, 50,000, 60,000, 70,000, 80,000, 90,000, 100000, 200,000, 300,000, 400,000, 500,000, 600,000, 700,000, 800,000, 900,000, 1000000, 2000000, 3000000, 4000000, 5000000, 6000000, 7000000, 8000000, 9000000, 10000000, 20000000, 50000000, or 100000000 identical barcodes per partition. Barcodes may be partitioned so that each partition contains at least about 1, 5, 10, 50, 100, 1000, 10000, 20000, 30000, 40000, 50000, 60000, 70000, 80000, 90000, 100000, 200,000, 300,000, 400,000, 500,000, 600,000, 700,000, 800,000, 900,000, 1000000, 2000000, 3000000, 4000000, 5000000, 6000000, 7000000, 8000000, 9000000, 10000000, 20000000, 50000000, 100000000, or more identical barcodes per partition. Barcodes may be partitioned so that each partition contains less than about 1, 5, 10, 50, 100, 1000, 10000, 20000, 30000, 40000, 50000, 60000, 70000, 80000, 90000, 100000, 200,000, 300,000, 400,000, 500,000, 600,000, 700,000, 800,000, 900,000, 1000000, 2000000, 3000000, 4000000, 5000000, 6000000, 7000000, 8000000, 9000000, 10000000, 20000000, 50000000, or 100000000 identical barcodes per partition. Barcodes may be partitioned such that each partition contains about 1-5, 5-10, 10-50, 50-100, 100-1000, 1000-10000, 10000-100000, 100000-1000000, 10000-1000000, 10000-10000000, or 10000-100000000 identical barcodes per partition.
Barcodes may be partitioned such that different barcodes are partitioned at a particular density. For example, different barcodes may be partitioned so that each partition contains about 1, 5, 10, 50, 100, 1000, 10000, 20,000, 30,000, 40,000, 50,000, 60,000, 70,000, 80,000, 90,000, 100000, 200,000, 300,000, 400,000, 500,000, 600,000, 700,000, 800,000, 900,000, 1000000, 2000000, 3000000, 4000000, 5000000, 6000000, 7000000, 8000000, 9000000, 10000000, 20000000, 50000000, or 100000000 different barcodes per partition. Barcodes may be partitioned so that each partition contains at least about 1, 5, 10, 50, 100, 1000, 10000, 20000, 30000, 40000, 50000, 60000, 70000, 80000, 90000, 100000, 200,000, 300,000, 400,000, 500,000, 600,000, 700,000, 800,000, 900,000, 1000000, 2000000, 3000000, 4000000, 5000000, 6000000, 7000000, 8000000, 9000000, 10000000, 20000000, 50000000, 100000000, or more different barcodes per partition. Barcodes may be partitioned so that each partition contains less than about 1, 5, 10, 50, 100, 1000, 10000, 20000, 30000, 40000, 50000, 60000, 70000, 80000, 90000, 100000, 200,000, 300,000, 400,000, 500,000, 600,000, 700,000, 800,000, 900,000, 1000000, 2000000, 3000000, 4000000, 5000000, 6000000, 7000000, 8000000, 9000000, 10000000, 20000000, 50000000, or 100000000 different barcodes per partition. Barcodes may be partitioned such that each partition contains about 1-5, 5-10, 10-50, 50-100, 100-1000, 1000-10000, 10000-100000, 100000-1000000, 10000-1000000, 10000-10000000, or 10000-100000000 different barcodes per partition.
The number of partitions employed to partition barcodes may vary, for example, depending on the application and/or the number of different barcodes to be partitioned. For example, the number of partitions employed to partition barcodes may be about 5, 10, 50, 100, 250, 500, 750, 1000, 1500, 2000, 2500, 5000, 7500, or 10,000, 20000, 30000, 40000, 50000, 60000, 70000, 80000, 90000, 100,000, 200000, 300000, 400000, 500000, 600000, 700000, 800000, 900000, 1,000,000, 2000000, 3000000, 4000000, 5000000, 10000000, 20000000 or more. The number of partitions employed to partition barcodes may be at least about 5, 10, 50, 100, 250, 500, 750, 1000, 1500, 2000, 2500, 5000, 7500, 10,000, 20000, 30000, 40000, 50000, 60000, 70000, 80000, 90000, 100000, 200000, 300000, 400000, 500000, 600000, 700000, 800000, 900000, 1000000, 2000000, 3000000, 4000000, 5000000, 10000000, 20000000 or more. The number of partitions employed to partition barcodes may be less than about 5, 10, 50, 100, 250, 500, 750, 1000, 1500, 2000, 2500, 5000, 7500, 10,000, 20000, 30000, 40000, 50000, 60000, 70000, 80000, 90000, 100000, 200000, 300000, 400000, 500000, 600000, 700000, 800000, 900000, 1000000, 2000000, 3000000, 4000000, 5000000, 10000000, or 20000000. The number of partitions employed to partition barcodes may be about 5-10000000, 5-5000000, 5-1,000,000, 10-10,000, 10-5,000, 10-1,000, 1,000-6,000, 1,000-5,000, 1,000-4,000, 1,000-3,000, or 1,000-2,000.
As described above, different barcodes or different sets of barcodes (e.g., each set comprising a plurality of identical barcodes or different barcodes) may be partitioned such that each partition comprises a different barcode or different barcode set. In some cases, each partition may comprise a different set of identical barcodes. Where different sets of identical barcodes are partitioned, the number of identical barcodes per partition may vary. For example, about 100,000 or more different sets of identical barcodes may be partitioned across about 100,000 or more different partitions, such that each partition comprises a different set of identical barcodes. In each partition, the number of identical barcodes per set of barcodes may be about 1,000,000 identical barcodes. In some cases, the number of different sets of barcodes may be equal to or substantially equal to the number of partitions. Any suitable number of different barcodes or different barcode sets (including numbers of different barcodes or different barcode sets to be partitioned described elsewhere herein), number of barcodes per partition (including numbers of barcodes per partition described elsewhere herein), and number of partitions (including numbers of partitions described elsewhere herein) may be combined to generate a diverse library of partitioned barcodes with high numbers of barcodes per partition. Thus, as will be appreciated, any of the above-described different numbers of barcodes may be provided with any of the above-described barcode densities per partition, and in any of the above-described numbers of partitions.
The barcodes may be loaded into the partitions at an expected or predicted ratio of barcodes per species to be barcoded (e.g., polynucleotide fragment, strand of polynucleotide, cell, etc.). In some cases, the barcodes are loaded into partitions such that more than about 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 20, 50, 100, 500, 1000, 5000, 10000, or 200000 barcodes are loaded per species. In some cases, the barcodes are loaded in the partitions so that less than about 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 20, 50, 100, 500, 1000, 5000, 10000, or 200000 barcodes are loaded per species. In some cases, the average number of barcodes loaded per species is less than, or greater than, about 0.0001, 0.001, 0.01, 0.1, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 20, 50, 100, 500, 1000, 5000, 10000, or 200000 barcodes per species.
When more than one barcode is present per polynucleotide fragment, such barcodes may be copies of the same barcode, or multiple different barcodes. For example, the attachment process may be designed to attach multiple identical barcodes to a single polynucleotide fragment, or multiple different barcodes to the polynucleotide fragment.
The methods provided herein may comprise loading a partition with the reagents necessary for the attachment of barcodes to polynucleotide fragments. In the case of ligation reactions, reagents including restriction enzymes, ligase enzymes, buffers, adapters, barcodes and the like may be loaded into a partition. In the case barcoding by amplification, reagents including primers, DNA polymerases, DNTPs, buffers, barcodes and the like may be loaded into a partition. As described throughout this disclosure, these reagents may be loaded directly into the partition, or via another partition.
Barcodes may be ligated to a polynucleotide fragment using sticky or blunt ends. Barcoded polynucleotide fragments may also be generated by amplifying a polynucleotide fragment with primers comprising barcodes. As with any other species discussed in this disclosure, these modules may be contained within the same or different partitions, depending on the needs of assay or process.
Barcodes may be assembled combinatorially, from smaller components designed to assemble in a modular format. For example, three modules, 1A, 1B, and 1C may be combinatorially assembled to produce barcode 1ABC. Such combinatorial assembly may significantly reduce the cost of synthesizing a plurality of barcodes. For example, a combinatorial system consisting of 3 A modules, 3 B modules, and 3 C modules may generate 3*3*3=27 possible barcode sequences from only 9 modules.
In some cases, barcodes may be combinatorially assembled by mixing two oligonucleotides and hybridizing them to produce annealed or partially annealed oligonucleotides (e.g., forked adapters). These barcodes may comprise an overhang of one or more nucleotides, in order to facilitate ligation with polynucleotide fragments that are to be barcoded. In some cases, the 5′ end of the antisense strand may be phosphorylated in order to ensure double-stranded ligation. Using this approach, different modules may be assembled by, for example, mixing oligonucleotides A and B, A and C, A and D, B and C, B, and D, and so on. The annealed oligonucleotides may also be synthesized as a single molecule with a hairpin loop that may be cut after ligation to the polynucleotide to be barcoded.
c. Amplification
In some cases, a polynucleotide is amplified during sample processing. This amplification may be performed in one or more of the partitions described in this disclosure. Amplification may be useful for a variety of purposes, including but not limited to generating multiple copies of polynucleotide sequences, addition of adapter sequences or barcodes to polynucleotides, mutation or error detection, producing higher quality samples for further downstream processing and the like.
An suitable amplification method may be utilized, including polymerase chain reaction (PCR), ligase chain reaction (LCR), helicase-dependent amplification, linear after the exponential PCR (LATE-PCR) asymmetric amplification, digital PCR, degenerate oligonucleotide primer PCR (DOP-PCR), primer extension pre-amplification PCR (PEP-PCR) and ligation mediated PCR, rolling circle amplification, multiple displacement amplification (MDA), and single primer isothermal linear amplification. In one example, MDA may be performed on a species contained within a partition. In some cases, this species is a whole chromosome from a cell.
In some cases, stimuli may be used to trigger the release of a species from a partition. Generally, a stimulus may cause disruption of the structure of a partition, such as the wall of a well, a component of a spot, the stability of a droplet (e.g., a droplet in an emulsion), or the shell of a capsule. These stimuli are particularly useful in inducing a partition to release its contents. Because a partition may be contained within another partition, and each partition may be responsive (or not responsive) to different stimuli, stimuli-responsiveness may be employed to release the contents of one partition (e.g., a partition responsive to the stimulus) into another partition (e.g., a partition not responsive to that stimulus, or less responsive to that stimulus).
Via diffusion or other means, inner partitions 806 and 807 may come into contact and fuse 812 together such that a new partition 808 can be generated comprising the combined contents of inner partitions 806 and 807 (e.g., species A+B+inner partition 809). The action 810 of species A on inner partition 809 can degrade or dissolve inner partition 809 such that the contents (e.g., species C) of inner partition 809 can be released into partition 808 to generate a new partition 811. Partition 811 comprises the combined contents of inner partitions 806, 807, and 809 (e.g., species A+B+C).
Upon application of an appropriate stimulus 817 (e.g., heat), inner partitions 816 may be disrupted or degraded such that species B is released to the interior of outer partition 814. The action 818 of species B on inner partition 815 can degrade or dissolve inner partition 815 such that the contents of inner partition 815 can be released to the interior of outer partition 814. Outer partition 814 can then comprise the combined contents (e.g., species A+B) of inner partitions 815 and 816.
In another example, species B as described above with respect to
Upon application of an appropriate stimulus 822 (e.g., heat), inner partition 820 may be disrupted or degraded such that inner partition 821 is released to the interior of outer partition 819. The action 823 of species A on inner partition 821 can degrade or dissolve inner partition 821 such that the contents of inner partition 821 (e.g., species B) can be released to the interior of outer partition 819. Outer partition 819 can then comprise the combined contents (e.g., species A+B) of inner partition 821 and outer partition 819.
Of course, the configuration shown in
Examples of stimuli that may be used include chemical stimuli, bulk changes, biological stimuli, light, thermal stimuli, magnetic stimuli, addition of a medium to a well, and any combination thereof, as described more fully below. (See, e.g., Esser-Kahn et al., (2011) Macromolecules 44: 5539-5553; Wang et al., (2009) ChemPhysChem 10:2405-2409.)
a. Chemical Stimuli and Bulk Changes
Numerous chemical triggers may be used to trigger the disruption of partitions (e.g., Plunkett et al., Biomacromolecules, 2005, 6:632-637). Examples of these chemical changes may include, but are not limited to pH-mediated changes to the integrity of a component of a partition, disintegration of a component of a partition via chemical cleavage of crosslink bonds, and triggered depolymerization of a component of a partition. Bulk changes may also be used to trigger disruption of partitions.
A change in pH of a solution, such as a decrease in pH, may trigger disruption of a partition via a number of different mechanisms. The addition of acid may cause degradation or disassembly a portion of a partition through a variety of mechanisms. Addition of protons may disassemble cross-linking of polymers in a component of a partition, disrupt ionic or hydrogen bonds in a component of a partition, or create nanopores in a component of a partition to allow the inner contents to leak through to the exterior. A change in pH may also destabilize an emulsion, leading to release of the contents of the droplets.
In some examples, a partition is produced from materials that comprise acid-degradable chemical cross-linkers, such a ketals. A decrease in pH, particular to a pH lower than 5, may induce the ketal to convert to a ketone and two alcohols and facilitate disruption of the partition. In other examples, the partitions may be produced from materials comprising one or more polyelectrolytes that are pH sensitive. A decrease in pH may disrupt the ionic- or hydrogen-bonding interactions of such partitions, or create nanopores therein. In some cases, partitions made from materials comprising polyelectrolytes comprise a charged, gel-based core that expands and contracts upon a change of pH.
Disruption of cross-linked materials comprising a partition can be accomplished through a number of mechanisms. In some examples, a partition can be contacted with various chemicals that induce oxidation, reduction or other chemical changes. In some cases, a reducing agent, such as beta-mercaptoethanol, can be used, such that disulfide bonds of a partition are disrupted. In addition, enzymes may be added to cleave peptide bonds in materials forming a partition, thereby resulting in a loss of integrity of the partition.
Depolymerization can also be used to disrupt partitions. A chemical trigger may be added to facilitate the removal of a protecting head group. For example, the trigger may cause removal of a head group of a carbonate ester or carbamate within a polymer, which in turn causes depolymerization and release of species from the inside of a partition.
In yet another example, a chemical trigger may comprise an osmotic trigger, whereby a change in ion or solute concentration in a solution induces swelling of a material used to make a partition. Swelling may cause a buildup of internal pressure such that a partition ruptures to release its contents. Swelling may also cause an increase in the pore size of the material, allowing species contained within the partition to diffuse out, and vice versa.
A partition may also be made to release its contents via bulk or physical changes, such as pressure induced rupture, melting, or changes in porosity.
b. Biological Stimuli
Biological stimuli may also be used to trigger disruption of partitions. Generally, biological triggers resemble chemical triggers, but many examples use biomolecules, or molecules commonly found in living systems such as enzymes, peptides, saccharides, fatty acids, nucleic acids and the like. For example, partitions may be made from materials comprising polymers with peptide cross-links that are sensitive to cleavage by specific proteases. More specifically, one example may comprise a partition made from materials comprising GFLGK peptide cross links. Upon addition of a biological trigger such as the protease Cathepsin B, the peptide cross links of the shell well are cleaved and the contents of the capsule are released. In other cases, the proteases may be heat-activated. In another example, partitions comprise a component comprising cellulose. Addition of the hydrolytic enzyme chitosan serves as biologic trigger for cleavage of cellulosic bonds, depolymerization of component of the partition comprising chitosan, and release of its inner contents.
c. Thermal Stimuli
Partitions may also be induced to release their contents upon the application of a thermal stimulus. A change in temperature can cause a variety changes to a partition. A change in heat may cause melting of a partition such that a portion of the partition disintegrates, or disruption of an emulsion. In other cases, heat may increase the internal pressure of the inner components of a partition such that the partition ruptures or explodes. In still other cases, heat may transform a partition into a shrunken dehydrated state. Heat may also act upon heat-sensitive polymers used as materials to construct partitions.
In one example, a partition is made from materials comprising a thermo-sensitive hydrogel. Upon the application of heat, such as a temperature above 35 C, the hydrogel material shrinks. The sudden shrinkage of the material increases the pressure and ruptures the partition.
In some cases, a material used to produce a partition may comprise a diblock polymer, or a mixture of two polymers, with different heat sensitivities. One polymer may be particularly likely to shrink after the application of heat, while the other is more heat-stable. When heat is applied to such shell wall, the heat-sensitive polymer may shrink, while the other remains intact, causing a pore to form. In still other cases, a material used to produce a partition may comprise magnetic nanoparticles. Exposure to a magnetic field may cause the generation of heat, leading to rupture of the partition.
d. Magnetic Stimuli
Inclusion of magnetic nanoparticles in a material used to produce a partition may allow triggered rupture of the partition, as described above, as well as enable guidance of these partitions to other partitions (e.g., guidance of capsules to wells in an array). In one example, incorporation of Fe3O4 nanoparticles into materials used to produce partitions triggers rupture in the presence of an oscillating magnetic field stimulus.
e. Electrical and Light Stimuli
A partition may also be disrupted as the result of electrical stimulation. Similar to the magnetic particles described in the previous section, electrically sensitive particles can allow for both triggered rupture of partitions, as well as other functions such as alignment in an electric field or redox reactions. In one example, partitions made from materials comprising electrically sensitive material are aligned in an electric field such that release of inner reagents can be controlled. In other examples, electric fields may induce redox reactions within a partition that may increase porosity.
A light stimulus may also be used to disrupt the partitions. Numerous light triggers are possible and may include systems that use various molecules such as nanoparticles and chromophores capable of absorbing photons of specific ranges of wavelengths. For example, metal oxide coatings can be used to produce certain partitions. UV irradiation of partitions coated with SiO2/TiO2 may result in disintegration of the partition wall. In yet another example, photo switchable materials such as azobenzene groups may be incorporated in the materials used to produce the partitions. Upon the application of UV or visible light, chemicals such as these undergo a reversible cis-to-trans isomerization upon absorption of photons. In this aspect, incorporation of photo switches results in disintegration of a portion of a partition, or an increase in porosity of a portion of a partition.
f. Application of Stimuli
The devices, methods, compositions, systems, and kits of this disclosure may be used in combination with any apparatus or device that provides such trigger or stimulus. For example, if the stimulus is thermal, a device may be used in combination with a heated or thermally controlled plate, which allows heating of the wells and may induce the rupture of capsules. Any of a number of methods of heat transfer may be used for thermal stimuli, including but not limited to applying heat by radiative heat transfer, convective heat transfer, or conductive heat transfer. In other cases, if the stimulus is a biological enzyme, the enzyme may be injected into a device such that it is deposited into each well. In another aspect, if the stimulus is a magnetic or electric field, a device may be used in combination with a magnetic or electric plate.
a. Polynucleotide Sequencing
Generally, the methods and compositions provided herein are useful for preparation of polynucleotide fragments for downstream applications such as sequencing. Sequencing may be performed by any available technique. For example, sequencing may be performed by the classic Sanger sequencing method. Sequencing methods may also include: high-throughput sequencing, pyrosequencing, sequencing-by-synthesis, single-molecule sequencing, nanopore sequencing, sequencing-by-ligation, sequencing-by-hybridization, RNA-Seq (Illumina), Digital Gene Expression (Helicos), next generation sequencing, single molecule sequencing by synthesis (SMSS) (Helicos), massively-parallel sequencing, clonal single molecule Array (Solexa), shotgun sequencing, SMRT sequencing (Pacific Biosciences) Maxim-Gilbert sequencing, primer walking, and any other sequencing methods known in the art.
In some cases varying numbers of fragments are sequenced. For example, in some cases about 30%-90% of the fragments are sequenced. In some cases, about 35%-85%, 40%-80%, 45%-75%, 50%-70%, 55%-65%, or 50%-60% of the fragments are sequenced. In some cases, at least about 30%, 40%, 50%, 60%, 70%, 80%, or 90% of the fragments are sequenced. In some cases less than about 30%, 40%, 50%, 60%, 70%, 80%, or 90% of the fragments are sequenced.
In some cases sequences from fragments are assembled to provide sequence information for a contiguous region of the original target polynucleotide that is longer than the individual sequence reads. Individual sequence reads may be about 10-50, 50-100, 100-200, 200-300, 300-400, or more nucleotides in length.
The identities of the barcode tags may serve to order the sequence reads from individual fragments as well as to differentiate between haplotypes. For example, during the partitioning of individual fragments, parental polynucleotide fragments may separated into different partitions. With an increase in the number of partitions, the likelihood of a fragment from both a maternal and paternal haplotype contained in the same partition becomes negligibly small. Thus, sequence reads from fragments in the same partition may be assembled and ordered.
b. Polynucleotide Phasing
This disclosure also provides methods and compositions to prepare polynucleotide fragments in such a manner that may enable phasing or linkage information to be generated. Such information may allow for the detection of linked genetic variations in sequences, including genetic variations (e.g., SNPs, mutations, indels, copy number variations, transversions, translocations, inversions, etc.) that are separated by long stretches of polynucleotides. The term “indel” refers to a mutation resulting in a colocalized insertion and deletion and a net gain or loss in nucleotides. A “microindel” is an indel that results in a net gain or loss of 1 to 50 nucleotides. These variations may exist in either a cis or trans relationship. In a cis relationship, two or more genetic variations exist in the same polynucleotide or strand. In a trans relationship, two or more genetic variations exist on multiple polynucleotide molecules or strands.
Methods provided herein may be used to determine polynucleotide phasing. For example, a polynucleotide sample (e.g., a polynucleotide that spans a given locus or loci) may be partitioned such that at most one molecule of polynucleotide is present per partition. The polynucleotide may then be fragmented, barcoded, and sequenced. The sequences may be examined for genetic variation. The detection of genetic variations in the same sequence tagged with two different bar codes may indicate that the two genetic variations are derived from two separate strands of DNA, reflecting a trans relationship. Conversely, the detection of two different genetic variations tagged with the same bar codes may indicate that the two genetic variations are from the same strand of DNA, reflecting a cis relationship.
Phase information may be important for the characterization of a polynucleotide fragment, particularly if the polynucleotide fragment is derived from a subject at risk of, having, or suspected of a having a particular disease or disorder (e.g., hereditary recessive disease such as cystic fibrosis, cancer, etc.). The information may be able to distinguish between the following possibilities: (1) two genetic variations within the same gene on the same strand of DNA and (2) two genetic variations within the same gene but located on separate strands of DNA. Possibility (1) may indicate that one copy of the gene is normal and the individual is free of the disease, while possibility (2) may indicate that the individual has or will develop the disease, particularly if the two genetic variations are damaging to the function of the gene when present within the same gene copy. Similarly, the phasing information may also be able to distinguish between the following possibilities: (1) two genetic variations, each within a different gene on the same strand of DNA and (2) two genetic variations, each within a different gene but located on separate strands of DNA.
c. Sequencing Polynucleotides from Small Numbers of Cells
Methods provided herein may also be used to prepare polynucleotide contained within cells in a manner that enables cell-specific information to be obtained. The methods enable detection of genetic variations (e.g., SNPs, mutations, indels, copy number variations, transversions, translocations, inversions, etc.) from very small samples, such as from samples comprising about 10-100 cells. In some cases, about 1, 5, 10, 20, 30, 40, 50, 60, 70, 80, 90 or 100 cells may be used in the methods described herein. In some cases, at least about 1, 5, 10, 20, 30, 40, 50, 60, 70, 80, 90 or 100 cells may be used in the methods described herein. In other cases, at most about 5, 10, 20, 30, 40, 50, 60, 70, 80, 90 or 100 cells may be used in the methods described herein.
In an example, a method comprises partitioning a cellular sample (or crude cell extract) such that at most one cell (or extract of one cell) is present per partition, lysing the cells, fragmenting the polynucleotides contained within the cells by any of the methods described herein, attaching the fragmented polynucleotides to barcodes, pooling, and sequencing.
As described elsewhere herein, the barcodes and other reagents may be contained within a partition (e.g., a capsule). These capsules may be loaded into another partition (e.g., a well) before, after, or concurrently with the loading of the cell, such that each cell is contacted with a different capsule. This technique may be used to attach a unique barcode to polynucleotides obtained from each cell. The resulting tagged polynucleotides may then be pooled and sequenced, and the barcodes may be used to trace the origin of the polynucleotides. For example, polynucleotides with identical barcodes may be determined to originate from the same cell, while polynucleotides with different barcodes may be determined to originate from different cells.
The methods described herein may be used to detect the distribution of oncogenic mutations across a population of cancerous tumor cells. For example, some tumor cells may have a mutation, or amplification, of an oncogene (e.g., HER2, BRAF, EGFR, KRAS) in both alleles (homozygous), others may have a mutation in one allele (heterozygous), and still others may have no mutation (wild-type). The methods described herein may be used to detect these differences, and also to quantify the relative numbers of homozygous, heterozygous, and wild-type cells. Such information may be used, for example, to stage a particular cancer and/or to monitor the progression of the cancer and its treatment over time.
In some examples, this disclosure provides methods of identifying mutations in two different oncogenes (e.g., KRAS and EGFR). If the same cell comprises genes with both mutations, this may indicate a more aggressive form of cancer. In contrast, if the mutations are located in two different cells, this may indicate that the cancer is more benign, or less advanced.
d. Analysis of Gene Expression
Methods of the disclosure may be applicable to processing samples for the detection of changes in gene expression. A sample may comprise a cell, mRNA, or cDNA reverse transcribed from mRNA. The sample may be a pooled sample, comprising extracts from several different cells or tissues, or a sample comprising extracts from a single cell or tissue.
Cells may be placed directly into a partition (e.g., a microwell) and lysed. After lysis, the methods of the invention may be used to fragment and barcode the polynucleotides of the cell for sequencing. Polynucleotides may also be extracted from cells prior to introducing them into a partition used in a method of the invention. Reverse transcription of mRNA may be performed in a partition described herein, or outside of such a partition. Sequencing cDNA may provide an indication of the abundance of a particular transcript in a particular cell over time, or after exposure to a particular condition.
The methods presented above provide several advantages over current polynucleotide processing methods. First, inter-operator variability is greatly reduced. Second, the methods may be carried out in microfluidic devices, which have a low cost and can be easily fabricated. Third, the controlled fragmentation of the target polynucleotides allows the user to produce polynucleotide fragments with a defined and appropriate length. This aids in partitioning the polynucleotides and also reduces the amount of sequence information loss due to the present of overly-large fragments. The methods and systems also provide a facile workflow that maintains the integrity of the processed polynucleotide. Additionally, the use of restriction enzymes enables the user to create DNA overhangs (“sticky ends”) that may be designed for compatibility with adapters and/or barcodes.
e. Partitioning of Polynucleotides, Such as Chromosomes, from Cells
In one example the methods, compositions, systems, devices, and kits provided in this disclosure may be used to partition polynucleotides, including whole chromosomes, from cells. In one example, a single cell or a plurality of cells (e.g., 2, 10, 50, 100, 1000, 10000, 25000, 50000, 100000, 500000, 1000000, or more cells) is loaded into a vessel with lysis buffer and proteinase K, and incubated for a specified period of time. Utilization of a plurality of cells will enable polynucleotide phasing, for example, by partitioning each polynucleotide to be analyzed in its own partition.
After incubation, the cell lysate is partitioned, for example by flow focusing the cell lysate into a capsule. If phasing is to be performed, flow focusing is performed such that each capsule comprises only a single analyte (e.g., a single chromosome), or only a single copy of any particular chromosome (e.g., one copy of a first chromosome and one copy of a second chromosome). In some cases, a plurality of chromosomes may be encapsulated within the same capsule, so long as the chromosomes are not the same chromosome. The encapsulation is performed under gentle flow, to minimize shearing of the polynucleotides. The capsule may be porous, to allow washing of the contents of the capsule, and introduction of reagents into the capsule, while maintaining the polynucleotides (e.g., chromosomes) within the capsules. The encapsulated polynucleotides (e.g., chromosomes) may then be processed according to any of the methods provided in this disclosure, or known in the art. The capsule shells protect the encapsulated polynucleotides (e.g., chromosomes) from shearing and further degradation. Of course, this method can also be applied to any other cellular component.
As described above, the capsule shell may be used to protect a polynucleotide from shearing. However, a capsule may also be used as a partition to enable compartmentalized shearing of a polynucleotide or other analyte. For example, in some cases a polynucleotide may be encapsulated within a capsule and then subject to ultrasonic shear, or any other suitable shearing. The capsule shell may be configured to remain intact under the shear, while the encapsulated polynucleotide may be sheared, but will remain within the capsule. In some cases, a hydrogel droplet may be used to accomplish the same end.
In some cases, this disclosure provides kits comprising reagents for the generation of partitions. The kit may comprise any suitable reagents and instructions for the generation of partitions and partitions within partitions.
In one example, a kit comprises reagents for generating capsules within droplets in an emulsion. For example, a kit may comprise reagents for generating capsules, reagents for generating an emulsion, and instructions for introducing the capsules into the droplets of the emulsion. As specified throughout this disclosure, any suitable species may be incorporated into the droplets and/or into the capsule. A kit of this disclosure may also provide any of these species. Similarly, as described throughout the disclosure, the capsule may be designed to release its contents into the droplets of the emulsion upon the application of a stimulus.
In another example, a kit comprises reagents for generating capsules within capsules. For example, a kit may comprise reagents for generating inner capsules, reagents for generating outer capsules, and instructions for generating capsules within capsules. As specified throughout this disclosure, any suitable species may be incorporated into the inner and/or outer capsules. A kit of this disclosure may also provide any of these species. Similarly, as described throughout the disclosure, the inner capsule may be designed to release its contents into the outer capsule upon the application of a stimulus.
In some cases, this disclosure provides devices comprising partitions for the processing of analytes. A device may be a microwell array, or a micro spot array, as described elsewhere in this disclosure. A device may formed in a manner that it comprises any suitable partition. In some cases, a device comprises a plurality of wells, or a plurality of spots. Of course, any partition in a device may also hold other partitions, such as a capsule, a droplet in an emulsion, and the like.
A device may be formed from any suitable material. In some examples, a device is formed from a material selected from the group consisting of fused silica, soda lime glass, borosilicate glass, poly(methyl methacrylate), sapphire, silicon, germanium, cyclic olefin copolymer, polyethylene, polypropylene, polyacrylate, polycarbonate, plastic, and combinations thereof.
In some cases, a device comprises channels for the flow of fluids into and between partitions. Any suitable channels may be used. A device may comprise a fluid inlet and a fluid outlet. The inlet and outlet may be attached to liquid handling devices to introduce species into the device. The device may be sealed, before or after introduction of any species.
Materials that are hydrophilic and/or hydrophobic may be used in different parts of the device. For example, in some cases a device of this disclosure comprises a partition with an interior surface comprising a hydrophilic material. In some cases a surface exterior to the partitions comprises a hydrophobic material. In some cases, a fluid flow path is coated with a hydrophobic or hydrophilic material.
As will be appreciated, the instant disclosure provides for the use of any of the compositions, methods, devices, and kits described herein for a particular use or purpose, including the various applications, uses, and purposes described herein. For example, the disclosure provides for the use of the compositions, methods, devices, and kits described herein, in partitioning species, in partitioning oligonucleotides, in stimulus-selective release of species from partitions, in performing reactions (e.g., ligation and amplification reactions) in partitions, in performing nucleic acid synthesis reactions, in barcoding nucleic acid, in preparing polynucleotides for sequencing, in sequencing polynucleotides, in mutation detection, in neurologic disorder diagnostics, in diabetes diagnostics, in fetal aneuploidy diagnostics, in cancer mutation detection and forensics, in disease detection, in medical diagnostics, in low input nucleic acid applications, in circulating tumor cell (CTC) sequencing, in polynucleotide phasing, in sequencing polynucleotides from small numbers of cells, in analyzing gene expression, in partitioning polynucleotides from cells, in a combination thereof, and in any other application, method, process or use described herein.
Capsules were produced according to the method illustrated in
The capsules were washed and resuspended in water.
Capsules were produced according to the method illustrated in
Capsules were produced according to the method illustrated in
Capsules were produced according to the method illustrated in
Many examples of different configurations of partitions are provided throughout this disclosure.
The configuration of
The configuration of
The configuration of
The configuration of
The configuration of
A well comprising spots in the configuration of
Polynucleotides (e.g., genomic DNA) are isolated from cells according to methods known in the art. The polynucleotides are encapsulated in a capsule and/or within a hydrogel matrix. The polynucleotides are fragmented by exposing the capsules and/or hydrogel matrix to shear stress induced by ultrasonic waves. Sheared, encapsulated polynucleotide is generated.
With reference to
The encapsulated fragmented polynucleotide can then be processed according to any suitable method, including methods known in the art and methods described in this disclosure.
While preferred embodiments of the present invention have been shown and described herein, it will be obvious to those skilled in the art that such embodiments are provided by way of example only. Numerous variations, changes, and substitutions will now occur to those skilled in the art without departing from the invention. It should be understood that various alternatives to the embodiments of the invention described herein may be employed in practicing the invention. It is intended that the following claims define the scope of the invention and that methods and structures within the scope of these claims and their equivalents be covered thereby.
This application is a continuation of U.S. patent application Ser. No. 15/693,374, filed on Aug. 31, 2017, which is a continuation application of U.S. patent application Ser. No. 15/470,814, filed Mar. 27, 2017, which is a continuation application of U.S. patent application Ser. No. 14/175,935, filed Feb. 7, 2014, now U.S. Pat. No. 9,644,204, which claims the benefit of U.S. Provisional Patent Application No. 61/762,435, filed Feb. 8, 2013, U.S. Provisional Patent Application No. 61/800,223, filed Mar. 15, 2013, U.S. Provisional Patent Application No. 61/840,403, filed Jun. 27, 2013, and U.S. Provisional Patent Application No. 61/844,804, filed Jul. 10, 2013, said applications are incorporated herein by reference in their entireties for all purposes.
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