US20150376609A1 - Methods of Analyzing Nucleic Acids from Individual Cells or Cell Populations - Google Patents
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- C40B50/14—Solid phase synthesis, i.e. wherein one or more library building blocks are bound to a solid support during library creation; Particular methods of cleavage from the solid support
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- C12Q2537/00—Reactions characterised by the reaction format or use of a specific feature
- C12Q2537/10—Reactions characterised by the reaction format or use of a specific feature the purpose or use of
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- C12Q2537/00—Reactions characterised by the reaction format or use of a specific feature
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- C12Q2563/00—Nucleic acid detection characterized by the use of physical, structural and functional properties
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- C12Q2563/00—Nucleic acid detection characterized by the use of physical, structural and functional properties
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- C12Q2565/00—Nucleic acid analysis characterised by mode or means of detection
- C12Q2565/60—Detection means characterised by use of a special device
- C12Q2565/629—Detection means characterised by use of a special device being a microfluidic device
Definitions
- Nucleic acid sequencing can be used to obtain information in a wide variety of biomedical contexts, including diagnostics, prognostics, biotechnology, and forensic biology. Sequencing may involve basic methods including Maxam-Gilbert sequencing and chain-termination methods, or de novo sequencing methods including shotgun sequencing and bridge PCR, or next-generation methods including polony sequencing, 454 pyrosequencing, Illumina sequencing, SOLiD sequencing, Ion Torrent semiconductor sequencing, HeliScope single molecule sequencing, SMRT® sequencing, and others.
- compositions and systems for analyzing individual cells or small populations of cells including the analysis and attribution of nucleic acids from and to these individual cells or cell populations.
- An aspect of the disclosure provides a method of analyzing nucleic acids from cells that includes providing nucleic acids derived from an individual cell into a discrete partition; generating one or more first nucleic acid sequences derived from the nucleic acids within the discrete partition, which one or more first nucleic acid sequences have attached thereto oligonucleotides that comprise a common nucleic acid barcode sequence; generating a characterization of the one or more first nucleic acid sequences or one or more second nucleic acid sequences derived from the one or more first nucleic acid sequences, which one or more second nucleic acid sequences comprise the common barcode sequence; and identifying the one or more first nucleic acid sequences or one or more second nucleic acid sequences as being derived from the individual cell based, at least in part, upon a presence of the common nucleic acid barcode sequence in the generated characterization.
- the discrete partition is a discrete droplet.
- the oligonucleotides are co-partitioned with the nucleic acids derived from the individual cell into the discrete partition. In some embodiments, at least 10,000, at least 100,000 or at least 500,000 of the oligonucleotides are co-partitioned with the nucleic acids derived from the individual cell into the discrete partition.
- the oligonucleotides are provided attached to a bead, where each oligonucleotide on a bead comprises the same barcode sequence, and the bead is co-partitioned with the individual cell into the discrete partition.
- the oligonucleotides are releasably attached to the bead.
- the bead comprises a degradable bead.
- generating the characterization comprises sequencing the one or more first nucleic acid sequences or the one or more second nucleic acid sequences.
- the method may also include assembling a contiguous nucleic acid sequence for at least a portion of a genome of the individual cell from sequences of the one or more first nucleic acid sequences or the one or more second nucleic acid sequences.
- the method may also include characterizing the individual cell based upon the nucleic acid sequence for at least a portion of the genome of the individual cell.
- the nucleic acids are released from the individual cell in the discrete partition.
- the nucleic acids comprise ribonucleic acid (RNA), such as, for example, messenger RNA (mRNA).
- RNA ribonucleic acid
- mRNA messenger RNA
- generating one or more first nucleic acid sequences includes subjecting the nucleic acids to reverse transcription under conditions that yield the one or more first nucleic acid sequences.
- the reverse transcription occurs in the discrete partition.
- the oligonucleotides are provided in the discrete partition and include a poly-T sequence.
- the reverse transcription comprises hybridizing the poly-T sequence to at least a portion of each of the nucleic acids and extending the poly-T sequence in template directed fashion.
- the oligonucleotides include an anchoring sequence that facilitates hybridization of the poly-T sequence.
- the oligonucleotides include a random priming sequence that can be, for example, a random hexamer.
- the reverse transcription comprises hybridizing the random priming sequence to at least a portion of each of the nucleic acids and extending the random priming sequence in template directed fashion.
- a given one of the one or more first nucleic acid sequences has sequence complementarity to at least a portion of a given one of the nucleic acids.
- the discrete partition at most includes the individual cell among a plurality of cells.
- the oligonucleotides include a unique molecular sequence segment.
- the method can include identifying an individual nucleic acid sequence of the one or more first nucleic acid sequences or of the one or more second nucleic acid sequences as derived from a given nucleic acid of the nucleic acids based, at least in part, upon a presence of the unique molecular sequence segment.
- the method includes determining an amount of the given nucleic acid based upon a presence of the unique molecular sequence segment.
- the method includes, prior to generating the characterization, adding one or more additional sequences to the one or more first nucleic acid sequences to generate the one or more second nucleic acid sequences.
- the method includes adding a first additional nucleic acid sequence to the one or more first nucleic acid sequences with the aid of a switch oligonucleotide.
- the switch oligonucleotide hybridizes to at least a portion of the one or more first nucleic acid sequences and is extended in a template directed fashion to couple the first additional nucleic acid sequence to the one or more first nucleic acid sequences.
- the method includes amplifying the one of more first nucleic acid sequences coupled to the first additional nucleic acid sequence. In some embodiments, the amplifying occurs in the discrete partition. In some embodiments, the amplifying occurs after releasing the one or more first nucleic acid sequences coupled to the first additional nucleic acid sequence from the discrete partition.
- the method includes adding one or more second additional nucleic acid sequences to the one or more first nucleic acid sequences coupled to the first additional sequence to generate the one or more second nucleic acid sequences.
- the adding the one or more second additional sequences includes removing a portion of each of the one or more first nucleic acid sequences coupled to the first additional nucleic acid sequence and coupling thereto the one or more second additional nucleic acid sequences.
- the removing is completed via shearing of the one or more first nucleic acid sequences coupled (e.g., ligated) to the first additional nucleic acid sequence.
- the method includes subjecting the one or more first nucleic acid sequences to transcription to generate one or more RNA fragments. In some embodiments, the transcription occurs after releasing the one or more first nucleic acid sequences from the discrete partition. In some embodiments, the oligonucleotides include a T7 promoter sequence. In some embodiments, prior to generating the characterization, the method includes removing a portion of each of the one or more RNA sequences and coupling an additional sequence to the one or more RNA sequences. In some embodiments, prior to generating the characterization, the method includes subjecting the one or more RNA sequences coupled to the additional sequence to reverse transcription to generate the one or more second nucleic acid sequences.
- the method includes amplifying the one or more second nucleic acid sequences. In some embodiments, prior to generating the characterization, the method includes subjecting the one or more RNA sequences to reverse transcription to generate one or more DNA sequences. In some embodiments, prior to generating the characterization, the method includes removing a portion of each of the one or more DNA sequences and coupling one or more additional sequences to the one or more DNA sequences to generate the one or more second nucleic acid sequences. In some embodiments, prior to generating the characterization, the method includes amplifying the one or more second nucleic acid sequences.
- the nucleic acids include complementary (cDNA) generated from reverse transcription of RNA from the individual cell.
- the oligonucleotides include a priming sequence and are provided in the discrete partition.
- the priming sequence includes a random N-mer.
- generating the one or more first nucleic acid sequences includes hybridizing the priming sequence to the cDNA and extending the priming sequence in template directed fashion.
- the discrete partition includes switch oligonucleotides comprising a complement sequence of the oligonucleotides.
- generating the one or more first nucleic acid sequences includes hybridizing the switch oligonucleotides to at least a portion of nucleic acid fragments derived from the nucleic acids and extending the switch oligonucleotides in template directed fashion.
- generating the one or more first nucleic acid sequences includes attaching the oligonucleotides to the one or more first nucleic acid sequences.
- the one or more first nucleic acid sequences are nucleic acid fragments derived from the nucleic acids.
- generating the one or more first nucleic acid sequences includes coupling (e.g., ligating) the oligonucleotides to the nucleic acids.
- a plurality of partitions comprises the discrete partition. In some embodiments, the plurality of partitions, on average, comprises less than one cell per partition. In some embodiments, less than 25% of partitions of the plurality of partitions do not comprise a cell. In some embodiments, the plurality of partitions comprises discrete partitions each having at least one partitioned cell. In some embodiments, fewer than 25%, fewer than 20%, fewer than 15%, fewer than 10%, fewer than 5% or fewer than 1% of the discrete partitions comprise more than one cell. In some embodiments, at least a subset of the discrete partitions comprises a bead.
- the discrete partitions include partitioned nucleic acid barcode sequences. In some embodiments, the discrete partitions include at least 1,000, at least 10,000, or at least 100,000 different partitioned nucleic acid barcode sequences. In some embodiments, the plurality of partitions comprises at least 1,000, at least 10,000 or at least 100,000 partitions.
- the disclosure provides a method of characterizing cells in a population of a plurality of different cell types that includes providing nucleic acids from individual cells in the population into discrete partitions; attaching oligonucleotides that comprise a common nucleic acid barcode sequence to one or more fragments of the nucleic acids from the individual cells within the discrete partitions, where a plurality of different partitions comprise different common nucleic acid barcode sequences; and characterizing the one or more fragments of the nucleic acids from the plurality of discrete partitions, and attributing the one or more fragments to individual cells based, at least in part, upon the presence of a common barcode sequence; and characterizing a plurality of individual cells in the population based upon the characterization of the one or more fragments in the plurality of discrete partitions.
- the method includes fragmenting the nucleic acids.
- the discrete partitions are droplets.
- the characterizing the one or more fragments of the nucleic acids includes sequencing ribosomal deoxyribonucleic acid from the individual cells, and the characterizing the cells comprises identifying a cell genus, species, strain or variant.
- the individual cells are derived from a microbiome sample.
- the individual cells are derived from a human tissue sample.
- the individual cells are derived from circulating cells in a mammal.
- the individual cells are derived from a forensic sample.
- the nucleic acids are released from the individual cells in the discrete partitions.
- An additional aspect of the disclosure provides a method of characterizing an individual cell or population of cells that includes incubating a cell with a plurality of different cell surface feature binding group types, where each different cell surface binding group type is capable of binding to a different cell surface feature, and where each different cell surface binding group type comprises a reporter oligonucleotide associated therewith, under conditions that allow binding between one or more cell surface feature binding groups and its respective cell surface feature, if present; partitioning the cell into a partition that comprises a plurality of oligonucleotides comprising a barcode sequence; attaching the barcode sequence to oligonucleotide reporter groups present in the partition; sequencing the oligonucleotide reporter groups and attached barcodes; and characterizing cell surface features present on the cell based upon reporter oligonucleotides that are sequenced.
- An additional aspect of the disclosure provides a composition comprising a plurality of partitions, each of the plurality of partitions comprising an individual cell and a population of oligonucleotides that comprise a common nucleic acid barcode sequence.
- the plurality of partitions comprises droplets in an emulsion.
- the population of oligonucleotides within each of the plurality of partitions is coupled to a bead disposed within each of the plurality of partitions.
- the individual cell has associated therewith a plurality of different cell surface feature binding groups associated with their respective cell surface features and each different type of cell surface feature binding group includes an oligonucleotide reporter group comprising a different nucleotide sequence.
- the plurality of different cell surface feature binding groups includes a plurality of different antibodies or antibody fragments having a binding affinity for a plurality of different cell surface features.
- FIG. 1 schematically illustrates a microfluidic channel structure for partitioning individual or small groups of cells.
- FIG. 2 schematically illustrates a microfluidic channel structure for co-partitioning cells and beads or microcapsules comprising additional reagents.
- FIG. 3 schematically illustrates an example process for amplification and barcoding of cell's nucleic acids.
- FIG. 4 provides a schematic illustration of use of barcoding of cell's nucleic acids in attributing sequence data to individual cells or groups of cells for use in their characterization.
- FIG. 5 provides a schematic illustrating cells associated with labeled cell-binding ligands.
- FIG. 6 provides a schematic illustration of an example workflow for performing RNA analysis using the methods described herein.
- FIG. 7 provides a schematic illustration of an example barcoded oligonucleotide structure for use in analysis of ribonucleic (RNA) using the methods described herein.
- FIG. 8 provides an image of individual cells co-partitioned along with individual barcode bearing beads
- FIG. 9A-E provides schematic illustration of example barcoded oligonucleotide structures for use in analysis of RNA and example operations for performing RNA analysis.
- FIG. 10 provides schematic illustration of example barcoded oligonucleotide structure for use in example analysis of RNA and use of a sequence for in vitro transcription.
- FIG. 11 provides schematic illustration of an example barcoded oligonucleotide structure for use in analysis of RNA and example operations for performing RNA analysis.
- FIG. 12A-B provides schematic illustration of example barcoded oligonucleotide structure for use in analysis of RNA.
- FIG. 13A-C provides illustrations of example yields from template switch reverse transcription and PCR in partitions.
- FIG. 14A-B provides illustrations of example yields from reverse transcription and cDNA amplification in partitions with various cell numbers.
- FIG. 15 provides an illustration of example yields from cDNA synthesis and real-time quantitative PCR at various input cell concentrations and also the effect of varying primer concentration on yield at a fixed cell input concentration.
- FIG. 16 provides an illustration of example yields from in vitro transcription.
- FIG. 17 shows an example computer control system that is programmed or otherwise configured to implement methods provided herein.
- Advanced nucleic acid sequencing technologies have yielded daunting results in sequencing biological materials, including providing substantial sequence information on individual organisms, and relatively pure biological samples.
- these systems have not proven effective at being able to identify and characterize sub-populations of cells in biological samples that may represent a smaller minority of the overall make up of the sample, but for which individualized sequence information could prove even more valuable.
- nucleic acid sequencing technologies derive the nucleic acids that they sequence from collections of cells derived from tissue or other samples.
- the cells can be processed, en masse, to extract the genetic material that represents an average of the population of cells, which can then be processed into sequencing ready DNA libraries that are configured for a given sequencing technology.
- the nucleic acids derived from the cells may include DNA, or RNA, including, e.g., mRNA, total RNA, or the like, that may be processed to produce cDNA for sequencing, e.g., using any of a variety of RNA-seq methods.
- RNA-seq methods e.g.
- such ensemble sample preparation methods also are, from the outset, predisposed to primarily identifying and characterizing the majority constituents in the sample of cells, and are not designed to be able to pick out the minority constituents, e.g., genetic material contributed by one cell, a few cells, or a small percentage of total cells in the sample.
- the minority constituents e.g., genetic material contributed by one cell, a few cells, or a small percentage of total cells in the sample.
- an ensemble approach would be predisposed to presenting potentially grossly inaccurate data from cell populations that are non-homogeneous in terms of expression levels.
- an ensemble method would indicate low level expression for the entire population.
- PCR based amplification can preferentially amplify the majority DNA in place of the minority DNA, both as a function of comparative exponential amplification (the repeated doubling of the higher concentration quickly outpaces that of the smaller fraction) and as a function of sequestration of amplification reagents and resources (as the larger fraction is amplified, it preferentially utilizes primers and other amplification reagents).
- single molecule sequencing systems like the Pacific Biosciences SMRT Sequencing system can have sample input DNA requirements of from 500 nanograms (ng) to upwards of 10 micrograms ( ⁇ g), which is far larger than what can be derived from individual cells or even small subpopulations of cells.
- ng nanograms
- ⁇ g micrograms
- other NGS systems can be optimized for starting amounts of sample DNA in the sample of from approximately 50 ng to about 1 ⁇ g.
- the methods and systems provide advantages of being able to provide the attribution advantages of the non-amplified single molecule methods with the high throughput of the other next generation systems, with the additional advantages of being able to process and sequence extremely low amounts of input nucleic acids derivable from individual cells or small collections of cells.
- the methods described herein compartmentalize the analysis of individual cells or small populations of cells, including e.g., nucleic acids from individual cells or small groups of cells, and then allow that analysis to be attributed back to the individual cell or small group of cells from which the nucleic acids were derived.
- This can be accomplished regardless of whether the cell population represents a 50/50 mix of cell types, a 90/10 mix of cell types, or virtually any ratio of cell types, as well as a complete heterogeneous mix of different cell types, or any mixture between these.
- Differing cell types may include cells or biologic organisms from different tissue types of an individual, from different individuals, from differing genera, species, strains, variants, or any combination of any or all of the foregoing.
- differing cell types may include normal and tumor tissue from an individual, multiple different bacterial species, strains and/or variants from environmental, forensic, microbiome or other samples, or any of a variety of other mixtures of cell types.
- the methods and systems described herein provide for the compartmentalization, depositing or partitioning of the nucleic acid contents of individual cells from a sample material containing cells, into discrete compartments or partitions (referred to interchangeably herein as partitions), where each partition maintains separation of its own contents from the contents of other partitions.
- Unique identifiers e.g., barcodes
- the partitions refer to containers or vessels (such as wells, microwells, tubes, through ports in nanoarray substrates, e.g., BioTrove nanoarrays, or other containers).
- the compartments or partitions comprise partitions that are flowable within fluid streams.
- These partitions may be comprised of, e.g., microcapsules or micro-vesicles that have an outer barrier surrounding an inner fluid center or core, or they may be a porous matrix that is capable of entraining and/or retaining materials within its matrix.
- these partitions comprise droplets of aqueous fluid within a non-aqueous continuous phase, e.g., an oil phase.
- allocating individual cells to discrete partitions may generally be accomplished by introducing a flowing stream of cells in an aqueous fluid into a flowing stream of a non-aqueous fluid, such that droplets are generated at the junction of the two streams.
- aqueous cell-containing stream at a certain concentration level of cells, one can control the level of occupancy of the resulting partitions in terms of numbers of cells.
- the flows and channel architectures are controlled as to ensure a desired number of singly occupied partitions, less than a certain level of unoccupied partitions and less than a certain level of multiply occupied partitions.
- the systems and methods are used to ensure that the substantial majority of occupied partitions (partitions containing one or more microcapsules) include no more than 1 cell per occupied partition.
- the partitioning process is controlled such that fewer than 25% of the occupied partitions contain more than one cell, and in many cases, fewer than 20% of the occupied partitions have more than one cell, while in some cases, fewer than 10% or even fewer than 5% of the occupied partitions include more than one cell per partition.
- the flow of one or more of the cells, or other fluids directed into the partitioning zone are controlled such that, in many cases, no more than 50% of the generated partitions are unoccupied, i.e., including less than 1 cell, no more than 25% of the generated partitions, no more than 10% of the generated partitions, may be unoccupied. Further, in some aspects, these flows are controlled so as to present non-poissonian distribution of single occupied partitions while providing lower levels of unoccupied partitions.
- the above noted ranges of unoccupied partitions can be achieved while still providing any of the single occupancy rates described above.
- the use of the systems and methods described herein creates resulting partitions that have multiple occupancy rates of from less than 25%, less than 20%, less than 15%, less than 10%, and in many cases, less than 5%, while having unoccupied partitions of from less than 50%, less than 40%, less than 30%, less than 20%, less than 10%, and in some cases, less than 5%.
- the above-described occupancy rates are also applicable to partitions that include both cells and beads carrying the barcode oligonucleotides.
- a substantial percentage of the overall occupied partitions will include both a bead and a cell.
- At least 50% of the partitions can be so occupied, at least 60%, at least 70%, at least 80% or even at least 90% of the partitions can be so occupied.
- multiply occupied partitions e.g., containing two, three, four or more cells and/or beads within a single partition.
- the flow characteristics of the cell and/or bead containing fluids and partitioning fluids may be controlled to provide for such multiply occupied partitions.
- the flow parameters may be controlled to provide a desired occupancy rate at greater than 50% of the partitions, greater than 75%, and in some cases greater than 80%, 90%, 95%, or higher.
- the multiple beads within a single partition may comprise different reagents associated therewith.
- the flow and frequency of the different beads into the channel or junction may be controlled to provide for the desired ratio of microcapsules from each source, while ensuring the desired pairing or combination of such beads into a partition with the desired number of cells.
- the partitions described herein are often characterized by having extremely small volumes, e.g., less than 10 less than 5 ⁇ L, less than 1 ⁇ L, less than 900 picoliters (pL), less than 800 pL, less than 700 pL, less than 600 pL, less than 500 pL, less than 400 pL, less than 300 pL, less than 200 pL, less than 100 pL, less than 50 pL, less than 20 pL, less than 10 pL, less than 1 pL, less than 500 nanoliters (nL), or even less than 100 nL, 50 nL, or even less.
- extremely small volumes e.g., less than 10 less than 5 ⁇ L, less than 1 ⁇ L, less than 900 picoliters (pL), less than 800 pL, less than 700 pL, less than 600 pL, less than 500 pL, less than 400 pL, less than 300 pL, less than 200 pL, less than
- the droplets may have overall volumes that are less than 1000 pL, less than 900 pL, less than 800 pL, less than 700 pL, less than 600 pL, less than 500 pL, less than 400 pL, less than 300 pL, less than 200 pL, less than 100 pL, less than 50 pL, less than 20 pL, less than 10 pL, or even less than 1 pL.
- sample fluid volume e.g., including co-partitioned cells
- the sample fluid volume within the partitions may be less than 90% of the above described volumes, less than 80%, less than 70%, less than 60%, less than 50%, less than 40%, less than 30%, less than 20%, or even less than 10% the above described volumes.
- partitioning species may generate a population of partitions.
- any suitable number of partitions can be generated to generate the population of partitions.
- a population of partitions may be generated that comprises at least about 1,000 partitions, at least about 5,000 partitions, at least about 10,000 partitions, at least about 50,000 partitions, at least about 100,000 partitions, at least about 500,000 partitions, at least about 1,000,000 partitions, at least about 5,000,000 partitions at least about 10,000,000 partitions, at least about 50,000,000 partitions, at least about 100,000,000 partitions, at least about 500,000,000 partitions or at least about 1,000,000,000 partitions.
- the population of partitions may comprise both unoccupied partitions (e.g., empty partitions) and occupied partitions
- microfluidic channel networks are particularly suited for generating partitions as described herein.
- microfluidic devices include those described in detail in Provisional U.S. Patent Application No. 61/977,804, filed Apr. 4, 2014, the full disclosure of which is incorporated herein by reference in its entirety for all purposes.
- Alternative mechanisms may also be employed in the partitioning of individual cells, including porous membranes through which aqueous mixtures of cells are extruded into non-aqueous fluids.
- Such systems are generally available from, e.g., Nanomi, Inc.
- FIG. 1 An example of a simplified microfluidic channel structure for partitioning individual cells is illustrated in FIG. 1 .
- the majority of occupied partitions include no more than one cell per occupied partition and, in some cases, some of the generated partitions are unoccupied.
- some of the occupied partitions may include more than one cell.
- the partitioning process may be controlled such that fewer than 25% of the occupied partitions contain more than one cell, and in many cases, fewer than 20% of the occupied partitions have more than one cell, while in some cases, fewer than 10% or even fewer than 5% of the occupied partitions include more than one cell per partition.
- the channel structure can include channel segments 102 , 104 , 106 and 108 communicating at a channel junction 110 .
- a first aqueous fluid 112 that includes suspended cells 114 may be transported along channel segment 102 into junction 110 , while a second fluid 116 that is immiscible with the aqueous fluid 112 is delivered to the junction 110 from channel segments 104 and 106 to create discrete droplets 118 of the aqueous fluid including individual cells 114 , flowing into channel segment 108 .
- this second fluid 116 comprises an oil, such as a fluorinated oil, that includes a fluorosurfactant for stabilizing the resulting droplets, e g, inhibiting subsequent coalescence of the resulting droplets.
- a fluorinated oil such as a fluorinated oil
- fluorosurfactant for stabilizing the resulting droplets, e g, inhibiting subsequent coalescence of the resulting droplets.
- cells may be encapsulated within a microcapsule that comprises an outer shell or layer or porous matrix in which is entrained one or more individual cells or small groups of cells, and may include other reagents.
- Encapsulation of cells may be carried out by a variety of processes. In general, such processes combine an aqueous fluid containing the cells to be analyzed with a polymeric precursor material that may be capable of being formed into a gel or other solid or semi-solid matrix upon application of a particular stimulus to the polymer precursor.
- Such stimuli include, e.g., thermal stimuli (either heating or cooling), photo-stimuli (e.g., through photo-curing), chemical stimuli (e.g., through crosslinking, polymerization initiation of the precursor (e.g., through added initiators), or the like.
- microcapsules comprising cells may be carried out by a variety of methods.
- air knife droplet or aerosol generators may be used to dispense droplets of precursor fluids into gelling solutions in order to form microcapsules that include individual cells or small groups of cells.
- membrane based encapsulation systems such as those available from, e.g., Nanomi, Inc., may be used to generate microcapsules as described herein.
- microfluidic systems like that shown in FIG. 1 may be readily used in encapsulating cells as described herein.
- FIG. 1 may be readily used in encapsulating cells as described herein.
- non-aqueous fluid 116 may also include an initiator to cause polymerization and/or crosslinking of the polymer precursor to form the microcapsule that includes the entrained cells.
- initiator to cause polymerization and/or crosslinking of the polymer precursor to form the microcapsule that includes the entrained cells.
- particularly useful polymer precursor/initiator pairs include those described in, e.g., U.S. Patent Application Nos. 61/940,318, filed Feb. 7, 2014, 61/991,018, Filed May 9, 2014, and U.S. patent application Ser. No. 14/316,383, filed Jun. 26, 2014, the full disclosures of which are hereby incorporated herein by reference in their entireties for all purposes.
- the activation agent may comprise a cross-linking agent, or a chemical that activates a cross-linking agent within the formed droplets.
- the activation agent may comprise a polymerization initiator.
- the polymer precursor comprises a mixture of acrylamide monomer with a N,N′-bis-(acryloyl)cystamine (BAC) comonomer
- an agent such as tetraethylmethylenediamine (TEMED) may be provided within the second fluid streams in channel segments 104 and 106 , which initiates the copolymerization of the acrylamide and BAC into a cross-linked polymer network or, hydrogel.
- TEMED tetraethylmethylenediamine
- the TEMED may diffuse from the second fluid 116 into the aqueous first fluid 112 comprising the linear polyacrylamide, which will activate the crosslinking of the polyacrylamide within the droplets, resulting in the formation of the gel, e.g., hydrogel, microcapsules 118 , as solid or semi-solid beads or particles entraining the cells 114 .
- the gel e.g., hydrogel, microcapsules 118
- solid or semi-solid beads or particles entraining the cells 114 e.g., hydrogel, microcapsules 118
- other ‘activatable’ encapsulation compositions may also be employed in the context of the methods and compositions described herein.
- encapsulated cells can be selectively releasable from the microcapsule, e.g., through passage of time, or upon application of a particular stimulus, that degrades the microcapsule sufficiently to allow the cell, or its contents to be released from the microcapsule, e.g., into an additional partition, such as a droplet.
- degradation of the microcapsule may be accomplished through the introduction of an appropriate reducing agent, such as DTT or the like, to cleave disulfide bonds that cross link the polymer matrix
- an appropriate reducing agent such as DTT or the like
- encapsulated cells or cell populations provide certain potential advantages of being storable, and more portable than droplet based partitioned cells. Furthermore, in some cases, it may be desirable to allow cells to be analyzed to incubate for a select period of time, in order to characterize changes in such cells over time, either in the presence or absence of different stimuli.
- encapsulation of individual cells may allow for longer incubation than simple partitioning in emulsion droplets, although in some cases, droplet partitioned cells may also be incubated form different periods of time, e.g., at least 10 seconds, at least 30 seconds, at least 1 minute, at least 5 minutes, at least 10 minutes, at least 30 minutes, at least 1 hour, at least 2 hours, at least 5 hours, or at least 10 hours or more.
- the encapsulation of cells may constitute the partitioning of the cells into which other reagents are co-partitioned.
- encapsulated cells may be readily deposited into other partitions, e.g., droplets, as described above.
- the cells may be partitioned along with lysis reagents in order to release the contents of the cells within the partition.
- the lysis agents can be contacted with the cell suspension concurrently with, or immediately prior to the introduction of the cells into the partitioning junction/droplet generation zone, e.g., through an additional channel or channels upstream of channel junction 110 .
- lysis agents include bioactive reagents, such as lysis enzymes that are used for lysis of different cell types, e.g., gram positive or negative bacteria, plants, yeast, mammalian, etc., such as lysozymes, achromopeptidase, lysostaphin, labiase, kitalase, lyticase, and a variety of other lysis enzymes available from, e.g., Sigma-Aldrich, Inc. (St Louis, Mo.), as well as other commercially available lysis enzymes.
- Other lysis agents may additionally or alternatively be co-partitioned with the cells to cause the release of the cell's contents into the partitions.
- surfactant based lysis solutions may be used to lyse cells, although these may be less desirable for emulsion based systems where the surfactants can interfere with stable emulsions.
- lysis solutions may include non-ionic surfactants such as, for example, TritonX-100 and Tween 20.
- lysis solutions may include ionic surfactants such as, for example, sarcosyl and sodium dodecyl sulfate (SDS).
- lysis methods that employ other methods may be used, such as electroporation, thermal, acoustic or mechanical cellular disruption may also be used in certain cases, e.g., non-emulsion based partitioning such as encapsulation of cells that may be in addition to or in place of droplet partitioning, where any pore size of the encapsulate is sufficiently small to retain nucleic acid fragments of a desired size, following cellular disruption.
- non-emulsion based partitioning such as encapsulation of cells that may be in addition to or in place of droplet partitioning, where any pore size of the encapsulate is sufficiently small to retain nucleic acid fragments of a desired size, following cellular disruption.
- reagents can also be co-partitioned with the cells, including, for example, DNase and RNase inactivating agents or inhibitors, such as proteinase K, chelating agents, such as EDTA, and other reagents employed in removing or otherwise reducing negative activity or impact of different cell lysate components on subsequent processing of nucleic acids.
- DNase and RNase inactivating agents or inhibitors such as proteinase K
- chelating agents such as EDTA
- the cells may be exposed to an appropriate stimulus to release the cells or their contents from a co-partitioned microcapsule.
- a chemical stimulus may be co-partitioned along with an encapsulated cell to allow for the degradation of the microcapsule and release of the cell or its contents into the larger partition.
- this stimulus may be the same as the stimulus described elsewhere herein for release of oligonucleotides from their respective bead or partition.
- this may be a different and non-overlapping stimulus, in order to allow an encapsulated cell to be released into a partition at a different time from the release of oligonucleotides into the same partition.
- Additional reagents may also be co-partitioned with the cells, such as endonucleases to fragment the cell's DNA, DNA polymerase enzymes and dNTPs used to amplify the cell's nucleic acid fragments and to attach the barcode oligonucleotides to the amplified fragments.
- Additional reagents may also include reverse transcriptase enzymes, including enzymes with terminal transferase activity, primers and oligonucleotides, and switch oligonucleotides (also referred to herein as “switch oligos”) which can be used for template switching. In some cases, template switching can be used to increase the length of a cDNA.
- cDNA can be generated from reverse transcription of a template, e.g., cellular mRNA, where a reverse transcriptase with terminal transferase activity can add additional nucleotides, e.g., polyC, to the cDNA that are not encoded by the template, such, as at an end of the cDNA.
- Switch oligos can include sequences complementary to the additional nucleotides, e.g. polyG.
- the additional nucleotides (e.g., polyC) on the cDNA can hybridize to the sequences complementary to the additional nucleotides (e.g., polyG) on the switch oligo, whereby the switch oligo can be used by the reverse transcriptase as template to further extend the cDNA.
- Switch oligos may comprise deoxyribonucleic acids, ribonucleic acids, modified nucleic acids including locked nucleic acids (LNA), or any combination.
- the length of a switch oligo may be 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, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114,
- the length of a switch oligo may be 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, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114
- the length of a switch oligo may be at most 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, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114
- the nucleic acids contained therein may be further processed within the partitions.
- the nucleic acid contents of individual cells are generally provided with unique identifiers such that, upon characterization of those nucleic acids they may be attributed as having been derived from the same cell or cells.
- the ability to attribute characteristics to individual cells or groups of cells is provided by the assignment of unique identifiers specifically to an individual cell or groups of cells, which is another advantageous aspect of the methods and systems described herein.
- unique identifiers e.g., in the form of nucleic acid barcodes are assigned or associated with individual cells or populations of cells, in order to tag or label the cell's components (and as a result, its characteristics) with the unique identifiers.
- These unique identifiers are then used to attribute the cell's components and characteristics to an individual cell or group of cells. In some aspects, this is carried out by co-partitioning the individual cells or groups of cells with the unique identifiers.
- the unique identifiers are provided in the form of oligonucleotides that comprise nucleic acid barcode sequences that may be attached to or otherwise associated with the nucleic acid contents of individual cells, or to other components of the cells, and particularly to fragments of those nucleic acids.
- the oligonucleotides are partitioned such that as between oligonucleotides in a given partition, the nucleic acid barcode sequences contained therein are the same, but as between different partitions, the oligonucleotides can, and do have differing barcode sequences, or at least represent a large number of different barcode sequences across all of the partitions in a given analysis.
- only one nucleic acid barcode sequence can be associated with a given partition, although in some cases, two or more different barcode sequences may be present.
- the nucleic acid barcode sequences can include from 6 to about 20 or more nucleotides within the sequence of the oligonucleotides.
- the length of a barcode sequence may be 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 nucleotides or longer.
- the length of a barcode sequence may be at least 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 nucleotides or longer.
- the length of a barcode sequence may be at most 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 nucleotides or shorter.
- nucleotides may be completely contiguous, i.e., in a single stretch of adjacent nucleotides, or they may be separated into two or more separate subsequences that are separated by 1 or more nucleotides.
- separated barcode subsequences can be from about 4 to about 16 nucleotides in length.
- the barcode subsequence may be 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 nucleotides or longer.
- the barcode subsequence may be at least 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 nucleotides or longer.
- the barcode subsequence may be at most 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 nucleotides or shorter.
- the co-partitioned oligonucleotides can also comprise other functional sequences useful in the processing of the nucleic acids from the co-partitioned cells. These sequences include, e.g., targeted or random/universal amplification primer sequences for amplifying the genomic DNA from the individual cells within the partitions while attaching the associated barcode sequences, sequencing primers or primer recognition sites, hybridization or probing sequences, e.g., for identification of presence of the sequences or for pulling down barcoded nucleic acids, or any of a number of other potential functional sequences.
- sequences include, e.g., targeted or random/universal amplification primer sequences for amplifying the genomic DNA from the individual cells within the partitions while attaching the associated barcode sequences, sequencing primers or primer recognition sites, hybridization or probing sequences, e.g., for identification of presence of the sequences or for pulling down barcoded nucleic acids, or any of a number of other potential functional sequences.
- oligonucleotides may also be employed, including, e.g., coalescence of two or more droplets, where one droplet contains oligonucleotides, or microdispensing of oligonucleotides into partitions, e.g., droplets within microfluidic systems.
- beads, microparticles or microcapsules that each include large numbers of the above described oligonucleotides releasably attached to the beads, where all of the oligonucleotides attached to a particular bead will include the same nucleic acid barcode sequence, but where a large number of diverse barcode sequences are represented across the population of beads used.
- hydrogel beads e.g., comprising polyacrylamide polymer matrices
- hydrogel beads are used as a solid support and delivery vehicle for the oligonucleotides into the partitions, as they are capable of carrying large numbers of oligonucleotide molecules, and may be configured to release those oligonucleotides upon exposure to a particular stimulus, as described elsewhere herein.
- the population of beads will provide a diverse barcode sequence library that includes at least 1,000 different barcode sequences, at least 5,000 different barcode sequences, at least 10,000 different barcode sequences, at least at least 50,000 different barcode sequences, at least 100,000 different barcode sequences, at least 1,000,000 different barcode sequences, at least 5,000,000 different barcode sequences, or at least 10,000,000 different barcode sequences. Additionally, each bead can be provided with large numbers of oligonucleotide molecules attached.
- the number of molecules of oligonucleotides including the barcode sequence on an individual bead can be at least 1,000 oligonucleotide molecules, at least 5,000 oligonucleotide molecules, at least 10,000 oligonucleotide molecules, at least 50,000 oligonucleotide molecules, at least 100,000 oligonucleotide molecules, at least 500,000 oligonucleotides, at least 1,000,000 oligonucleotide molecules, at least 5,000,000 oligonucleotide molecules, at least 10,000,000 oligonucleotide molecules, at least 50,000,000 oligonucleotide molecules, at least 100,000,000 oligonucleotide molecules, and in some cases at least 1 billion oligonucleotide molecules.
- the resulting population of partitions can also include a diverse barcode library that includes at least 1,000 different barcode sequences, at least 5,000 different barcode sequences, at least 10,000 different barcode sequences, at least at least 50,000 different barcode sequences, at least 100,000 different barcode sequences, at least 1,000,000 different barcode sequences, at least 5,000,000 different barcode sequences, or at least 10,000,000 different barcode sequences.
- each partition of the population can include at least 1,000 oligonucleotide molecules, at least 5,000 oligonucleotide molecules, at least 10,000 oligonucleotide molecules, at least 50,000 oligonucleotide molecules, at least 100,000 oligonucleotide molecules, at least 500,000 oligonucleotides, at least 1,000,000 oligonucleotide molecules, at least 5,000,000 oligonucleotide molecules, at least 10,000,000 oligonucleotide molecules, at least 50,000,000 oligonucleotide molecules, at least 100,000,000 oligonucleotide molecules, and in some cases at least 1 billion oligonucleotide molecules.
- a mixed, but known barcode sequences set may provide greater assurance of identification in the subsequent processing, e.g., by providing a stronger address or attribution of the barcodes to a given partition, as a duplicate or independent confirmation of the output from a given partition.
- the oligonucleotides are releasable from the beads upon the application of a particular stimulus to the beads.
- the stimulus may be a photo-stimulus, e.g., through cleavage of a photo-labile linkage that releases the oligonucleotides.
- a thermal stimulus may be used, where elevation of the temperature of the beads environment will result in cleavage of a linkage or other release of the oligonucleotides form the beads.
- a chemical stimulus is used that cleaves a linkage of the oligonucleotides to the beads, or otherwise results in release of the oligonucleotides from the beads.
- compositions include the polyacrylamide matrices described above for encapsulation of cells, and may be degraded for release of the attached oligonucleotides through exposure to a reducing agent, such as DTT.
- the beads including the attached oligonucleotides are co-partitioned with the individual cells, such that a single bead and a single cell are contained within an individual partition.
- single cell/single bead occupancy is the most desired state, it will be appreciated that multiply occupied partitions (either in terms of cells, beads or both), or unoccupied partitions (either in terms of cells, beads or both) will often be present.
- An example of a microfluidic channel structure for co-partitioning cells and beads comprising barcode oligonucleotides is schematically illustrated in FIG. 2 .
- a substantial percentage of the overall occupied partitions will include both a bead and a cell and, in some cases, some of the partitions that are generated will be unoccupied. In some cases, some of the partitions may have beads and cells that are not partitioned 1:1. In some cases, it may be desirable to provide multiply occupied partitions, e.g., containing two, three, four or more cells and/or beads within a single partition.
- channel segments 202 , 204 , 206 , 208 and 210 are provided in fluid communication at channel junction 212 .
- An aqueous stream comprising the individual cells 214 , is flowed through channel segment 202 toward channel junction 212 . As described above, these cells may be suspended within an aqueous fluid, or may have been pre-encapsulated, prior to the partitioning process.
- an aqueous stream comprising the barcode carrying beads 216 , is flowed through channel segment 204 toward channel junction 212 .
- a non-aqueous partitioning fluid 216 is introduced into channel junction 212 from each of side channels 206 and 208 , and the combined streams are flowed into outlet channel 210 .
- the two combined aqueous streams from channel segments 202 and 204 are combined, and partitioned into droplets 218 , that include co-partitioned cells 214 and beads 216 .
- each of the fluids combining at channel junction 212 can optimize the combination and partitioning to achieve a desired occupancy level of beads, cells or both, within the partitions 218 that are generated.
- lysis agents e.g., cell lysis enzymes
- the bead stream e.g., flowing through channel segment 204
- Additional reagents may also be added to the partition in this configuration, such as endonucleases to fragment the cell's DNA, DNA polymerase enzyme and dNTPs used to amplify the cell's nucleic acid fragments and to attach the barcode oligonucleotides to the amplified fragments.
- a chemical stimulus such as DTT, may be used to release the barcodes from their respective beads into the partition.
- the chemical stimulus along with the cell-containing stream in channel segment 202 , such that release of the barcodes only occurs after the two streams have been combined, e.g., within the partitions 218 .
- introduction of a common chemical stimulus e.g., that both releases the oligonucleotides form their beads, and releases cells from their microcapsules may generally be provided from a separate additional side channel (not shown) upstream of or connected to channel junction 212 .
- reagents may be co-partitioned along with the cells, beads, lysis agents and chemical stimuli, including, for example, protective reagents, like proteinase K, chelators, nucleic acid extension, replication, transcription or amplification reagents such as polymerases, reverse transcriptases, transposases which can be used for transposon based methods (e.g., Nextera), nucleoside triphosphates or NTP analogues, primer sequences and additional cofactors such as divalent metal ions used in such reactions, ligation reaction reagents, such as ligase enzymes and ligation sequences, dyes, labels, or other tagging reagents.
- protective reagents like proteinase K, chelators, nucleic acid extension, replication, transcription or amplification reagents such as polymerases, reverse transcriptases, transposases which can be used for transposon based methods (e.g., Nextera), nucleoside triphosphat
- the channel networks can be fluidly coupled to appropriate fluidic components.
- the inlet channel segments e.g., channel segments 202 , 204 , 206 and 208 are fluidly coupled to appropriate sources of the materials they are to deliver to channel junction 212 .
- channel segment 202 will be fluidly coupled to a source of an aqueous suspension of cells 214 to be analyzed, while channel segment 204 would be fluidly coupled to a source of an aqueous suspension of beads 216 .
- Channel segments 206 and 208 would then be fluidly connected to one or more sources of the non-aqueous fluid.
- outlets may include any of a variety of different fluidic components, from simple reservoirs defined in or connected to a body structure of a microfluidic device, to fluid conduits that deliver fluids from off-device sources, manifolds, or the like.
- the outlet channel segment 210 may be fluidly coupled to a receiving vessel or conduit for the partitioned cells. Again, this may be a reservoir defined in the body of a microfluidic device, or it may be a fluidic conduit for delivering the partitioned cells to a subsequent process operation, instrument or component.
- FIG. 8 shows images of individual Jurkat cells co-partitioned along with barcode oligonucleotide containing beads in aqueous droplets in an aqueous in oil emulsion.
- individual cells may be readily co-partitioned with individual beads.
- optimization of individual cell loading may be carried out by a number of methods, including by providing dilutions of cell populations into the microfluidic system in order to achieve the desired cell loading per partition as described elsewhere herein.
- fragmentation may be accomplished through the co-partitioning of shearing enzymes, such as endonucleases, in order to fragment the nucleic acids into smaller fragments.
- shearing enzymes such as endonucleases
- endonucleases may include restriction endonucleases, including type II and type IIs restriction endonucleases as well as other nucleic acid cleaving enzymes, such as nicking endonucleases, and the like.
- fragmentation may not be desired, and full length nucleic acids may be retained within the partitions, or in the case of encapsulated cells or cell contents, fragmentation may be carried out prior to partitioning, e.g., through enzymatic methods, e.g., those described herein, or through mechanical methods, e.g., mechanical, acoustic or other shearing.
- the oligonucleotides disposed upon the bead may be used to barcode and amplify fragments of those nucleic acids.
- a particularly elegant process for use of these barcode oligonucleotides in amplifying and barcoding fragments of sample nucleic acids is described in detail in U.S. Provisional Patent Application Nos. 61/940,318, filed Feb. 7, 2014, 61/991,018, Filed May 9, 2014, and U.S. patent application Ser. No. 14/316,383, filed Jun. 26, 2014, and previously incorporated by reference.
- the oligonucleotides present on the beads that are co-partitioned with the cells are released from their beads into the partition with the cell's nucleic acids.
- the oligonucleotides can include, along with the barcode sequence, a primer sequence at its 5′ end.
- This primer sequence may be a random oligonucleotide sequence intended to randomly prime numerous different regions on the cell's nucleic acids, or it may be a specific primer sequence targeted to prime upstream of a specific targeted region of the cell's genome.
- the primer portion of the oligonucleotide can anneal to a complementary region of the cell's nucleic acid.
- Extension reaction reagents e.g., DNA polymerase, nucleoside triphosphates, co-factors (e.g., Mg2+ or Mn2+), that are also co-partitioned with the cells and beads, then extend the primer sequence using the cell's nucleic acid as a template, to produce a complementary fragment to the strand of the cell's nucleic acid to which the primer annealed, which complementary fragment includes the oligonucleotide and its associated barcode sequence.
- Annealing and extension of multiple primers to different portions of the cell's nucleic acids will result in a large pool of overlapping complementary fragments of the nucleic acid, each possessing its own barcode sequence indicative of the partition in which it was created.
- these complementary fragments may themselves be used as a template primed by the oligonucleotides present in the partition to produce a complement of the complement that again, includes the barcode sequence.
- this replication process is configured such that when the first complement is duplicated, it produces two complementary sequences at or near its termini, to allow formation of a hairpin structure or partial hairpin structure, the reduces the ability of the molecule to be the basis for producing further iterative copies.
- the cell's nucleic acids may include any desired nucleic acids within the cell including, for example, the cell's DNA, e.g., genomic DNA, RNA, e.g., messenger RNA, and the like.
- the methods and systems described herein are used in characterizing expressed mRNA, including, e.g., the presence and quantification of such mRNA, and may include RNA sequencing processes as the characterization process.
- the reagents partitioned along with the cells may include reagents for the conversion of mRNA into cDNA, e.g., reverse transcriptase enzymes and reagents, to facilitate sequencing processes where DNA sequencing is employed.
- the nucleic acids to be characterized comprise RNA, e.g., mRNA, schematic illustration of one example of this is shown in FIG. 3 .
- oligonucleotides that include a barcode sequence are co-partitioned in, e.g., a droplet 302 in an emulsion, along with a sample nucleic acid 304 .
- the oligonucleotides 308 may be provided on a bead 306 that is co-partitioned with the sample nucleic acid 304 , which oligonucleotides are releasable from the bead 306 , as shown in panel A.
- the oligonucleotides 308 include a barcode sequence 312 , in addition to one or more functional sequences, e.g., sequences 310 , 314 and 316 .
- oligonucleotide 308 is shown as comprising barcode sequence 312 , as well as sequence 310 that may function as an attachment or immobilization sequence for a given sequencing system, e.g., a P5 sequence used for attachment in flow cells of an Illumina Hiseq® or Miseq® system.
- the oligonucleotides also include a primer sequence 316 , which may include a random or targeted N-mer for priming replication of portions of the sample nucleic acid 304 .
- oligonucleotide 308 is also included within oligonucleotide 308 .
- sequence 314 may provide a sequencing priming region, such as a “read1” or R1 priming region, that is used to prime polymerase mediated, template directed sequencing by synthesis reactions in sequencing systems.
- the functional sequences may be selected to be compatible with a variety of different sequencing systems, e.g., 454 Sequencing, Ion Torrent Proton or PGM, Illumina X10, etc., and the requirements thereof.
- the barcode sequence 312 , immobilization sequence 310 and R1 sequence 314 may be common to all of the oligonucleotides attached to a given bead.
- the primer sequence 316 may vary for random N-mer primers, or may be common to the oligonucleotides on a given bead for certain targeted applications.
- the functional sequences may include primer sequences useful for RNA-seq applications.
- the oligonucleotides may include poly-T primers for priming reverse transcription of RNA for RNA-seq.
- oligonucleotides in a given partition e.g., included on an individual bead, may include multiple types of primer sequences in addition to the common barcode sequences, such as both DNA-sequencing and RNA sequencing primers, e.g., poly-T primer sequences included within the oligonucleotides coupled to the bead.
- a single partitioned cell may be both subjected to DNA and RNA sequencing processes.
- the oligonucleotides can prime the sample nucleic acid as shown in panel B, which allows for extension of the oligonucleotides 308 and 308 a using polymerase enzymes and other extension reagents also co-partitioned with the bead 306 and sample nucleic acid 304 .
- panel C following extension of the oligonucleotides that, for random N-mer primers, would anneal to multiple different regions of the sample nucleic acid 304 ; multiple overlapping complements or fragments of the nucleic acid are created, e.g., fragments 318 and 320 .
- sequence portions that are complementary to portions of sample nucleic acid e.g., sequences 322 and 324
- these constructs are generally referred to herein as comprising fragments of the sample nucleic acid 304 , having the attached barcode sequences.
- the barcoded nucleic acid fragments may then be subjected to characterization, e.g., through sequence analysis, or they may be further amplified in the process, as shown in panel D.
- additional oligonucleotides e.g., oligonucleotide 308 b , also released from bead 306 , may prime the fragments 318 and 320 . This shown in for fragment 318 .
- the oligonucleotide anneals with the fragment 318 , and is extended to create a complement 326 to at least a portion of fragment 318 which includes sequence 328 , that comprises a duplicate of a portion of the sample nucleic acid sequence. Extension of the oligonucleotide 308 b continues until it has replicated through the oligonucleotide portion 308 of fragment 318 .
- the oligonucleotides may be configured to prompt a stop in the replication by the polymerase at a desired point, e.g., after replicating through sequences 316 and 314 of oligonucleotide 308 that is included within fragment 318 .
- this may be accomplished by different methods, including, for example, the incorporation of different nucleotides and/or nucleotide analogues that are not capable of being processed by the polymerase enzyme used.
- this may include the inclusion of uracil containing nucleotides within the sequence region 312 to prevent a non-uracil tolerant polymerase to cease replication of that region.
- a fragment 326 is created that includes the full-length oligonucleotide 308 b at one end, including the barcode sequence 312 , the attachment sequence 310 , the R1 primer region 314 , and the random N-mer sequence 316 b .
- the complement 316 ′ to the random N-mer of the first oligonucleotide 308 may be included the complement 316 ′ to the random N-mer of the first oligonucleotide 308 , as well as a complement to all or a portion of the R1 sequence, shown as sequence 314 ′.
- the R1 sequence 314 and its complement 314 ′ are then able to hybridize together to form a partial hairpin structure 328 .
- sequence 316 ′ which is the complement to random N-mer 316
- sequence 316 b which is the complement to random N-mer 316
- the N-mers would be common among oligonucleotides within a given partition.
- partial hairpin structures By forming these partial hairpin structures, it allows for the removal of first level duplicates of the sample sequence from further replication, e.g., preventing iterative copying of copies.
- the partial hairpin structure also provides a useful structure for subsequent processing of the created fragments, e.g., fragment 326 .
- the amplification of the cell's nucleic acids is carried out until the barcoded overlapping fragments within the partition constitute at least 1 ⁇ coverage of the particular portion or all of the cell's genome, at least 2 ⁇ , at least 3 ⁇ , at least 4 ⁇ , at least 5 ⁇ , at least 10 ⁇ , at least 20 ⁇ , at least 40 ⁇ or more coverage of the genome or its relevant portion of interest.
- barcoded fragments may be directly sequenced on an appropriate sequencing system, e.g., an Illumina Hiseq®, Miseq® or X10 system, or they may be subjected to additional processing, such as further amplification, attachment of other functional sequences, e.g., second sequencing primers, for reverse reads, sample index sequences, and the like.
- an appropriate sequencing system e.g., an Illumina Hiseq®, Miseq® or X10 system
- additional processing such as further amplification, attachment of other functional sequences, e.g., second sequencing primers, for reverse reads, sample index sequences, and the like.
- All of the fragments from multiple different partitions may then be pooled for sequencing on high throughput sequencers as described herein, where the pooled fragments comprise a large number of fragments derived from the nucleic acids of different cells or small cell populations, but where the fragments from the nucleic acids of a given cell will share the same barcode sequence.
- the sequence of that fragment may be attributed back to that cell or those cells based upon the presence of the barcode, which will also aid in applying the various sequence fragments from multiple partitions to assembly of individual genomes for different cells. This is schematically illustrated in FIG. 4 .
- a first nucleic acid 404 from a first cell 400 , and a second nucleic acid 406 from a second cell 402 are each partitioned along with their own sets of barcode oligonucleotides as described above.
- the nucleic acids may comprise a chromosome, entire genome or other large nucleic acid from the cells.
- each cell's nucleic acids 404 and 406 is then processed to separately provide overlapping set of second fragments of the first fragment(s), e.g., second fragment sets 408 and 410 .
- This processing also provides the second fragments with a barcode sequence that is the same for each of the second fragments derived from a particular first fragment.
- the barcode sequence for second fragment set 408 is denoted by “1” while the barcode sequence for fragment set 410 is denoted by “2”.
- a diverse library of barcodes may be used to differentially barcode large numbers of different fragment sets. However, it is not necessary for every second fragment set from a different first fragment to be barcoded with different barcode sequences. In fact, in many cases, multiple different first fragments may be processed concurrently to include the same barcode sequence. Diverse barcode libraries are described in detail elsewhere herein.
- the barcoded fragments may then be pooled for sequencing using, for example, sequence by synthesis technologies available from Illumina or Ion Torrent division of Thermo-Fisher, Inc.
- sequence reads 412 can be attributed to their respective fragment set, e.g., as shown in aggregated reads 414 and 416 , at least in part based upon the included barcodes, and in some cases, in part based upon the sequence of the fragment itself.
- the attributed sequence reads for each fragment set are then assembled to provide the assembled sequence for each cell's nucleic acids, e.g., sequences 418 and 420 , which in turn, may be attributed to individual cells, e.g., cells 400 and 402 .
- the methods and systems described herein may have much broader applicability, including the ability to characterize other aspects of individual cells or cell populations, by allowing for the allocation of reagents to individual cells, and providing for the attributable analysis or characterization of those cells in response to those reagents. These methods and systems are particularly valuable in being able to characterize cells for, e.g., research, diagnostic, pathogen identification, and many other purposes.
- cell surface features e.g., cell surface proteins like cluster of differentiation or CD proteins, have significant diagnostic relevance in characterization of diseases like cancer.
- the methods and systems described herein may be used to characterize cell features, such as cell surface features, e.g., proteins, receptors, etc.
- the methods described herein may be used to attach reporter molecules to these cell features, that when partitioned as described above, may be barcoded and analyzed, e.g., using DNA sequencing technologies, to ascertain the presence, and in some cases, relative abundance or quantity of such cell features within an individual cell or population of cells.
- a library of potential cell binding ligands e.g., antibodies, antibody fragments, cell surface receptor binding molecules, or the like, maybe provided associated with a first set of nucleic acid reporter molecules, e.g., where a different reporter oligonucleotide sequence is associated with a specific ligand, and therefore capable of binding to a specific cell surface feature.
- different members of the library may be characterized by the presence of a different oligonucleotide sequence label, e.g., an antibody to a first type of cell surface protein or receptor would have associated with it a first known reporter oligonucleotide sequence, while an antibody to a second receptor protein would have a different known reporter oligonucleotide sequence associated with it.
- the cells Prior to co-partitioning, the cells would be incubated with the library of ligands, that may represent antibodies to a broad panel of different cell surface features, e.g., receptors, proteins, etc., and which include their associated reporter oligonucleotides.
- Unbound ligands are washed from the cells, and the cells are then co-partitioned along with the barcode oligonucleotides described above.
- the partitions will include the cell or cells, as well as the bound ligands and their known, associated reporter oligonucleotides.
- reporter oligonucleotides Without the need for lysing the cells within the partitions, one could then subject the reporter oligonucleotides to the barcoding operations described above for cellular nucleic acids, to produce barcoded, reporter oligonucleotides, where the presence of the reporter oligonucleotides can be indicative of the presence of the particular cell surface feature, and the barcode sequence will allow the attribution of the range of different cell surface features to a given individual cell or population of cells based upon the barcode sequence that was co-partitioned with that cell or population of cells. As a result, one may generate a cell-by-cell profile of the cell surface features within a broader population of cells. This aspect of the methods and systems described herein, is described in greater detail below.
- FIG. 5 This example is schematically illustrated in FIG. 5 .
- a population of cells represented by cells 502 and 504 are incubated with a library of cell surface associated reagents, e.g., antibodies, cell surface binding proteins, ligands or the like, where each different type of binding group includes an associated nucleic acid reporter molecule associated with it, shown as ligands and associated reporter molecules 506 , 508 , 510 and 512 (with the reporter molecules being indicated by the differently shaded circles).
- ligands and associated reporter molecules can become associated or coupled with the cell surface.
- Individual cells are then partitioned into separate partitions, e.g., droplets 514 and 516 , along with their associated ligand/reporter molecules, as well as an individual barcode oligonucleotide bead as described elsewhere herein, e.g., beads 522 and 524 , respectively.
- the barcoded oligonucleotides are released from the beads and used to attach the barcode sequence the reporter molecules present within each partition with a barcode that is common to a given partition, but which varies widely among different partitions. For example, as shown in FIG.
- the reporter molecules that associate with cell 502 in partition 514 are barcoded with barcode sequence 518
- the reporter molecules associated with cell 504 in partition 516 are barcoded with barcode 520 .
- a library of oligonucleotides that reflects the surface ligands of the cell, as reflected by the reporter molecule, but which is substantially attributable to an individual cell by virtue of a common barcode sequence, allowing a single cell level profiling of the surface characteristics of the cell.
- this process is not limited to cell surface receptors but may be used to identify the presence of a wide variety of specific cell structures, chemistries or other characteristics.
- a particularly valuable application of the single cell analysis processes described herein is in the sequencing and characterization of cancer cells.
- conventional analytical techniques including the ensemble sequencing processes alluded to above, are not highly adept at picking small variations in genomic make-up of cancer cells, particularly where those exist in a sea of normal tissue cells.
- wide variations can exist and can be masked by the ensemble approaches to sequencing (See, e.g., Patel, et al., Single-cell RNA-seq highlights intratumoral heterogeneity in primary glioblastoma, Science DOI: 10.1126/science.1254257 (Published online Jun. 12, 2014).
- Cancer cells may be derived from solid tumors, hematological malignancies, cell lines, or obtained as circulating tumor cells, and subjected to the partitioning processes described above. Upon analysis, one can identify individual cell sequences as deriving from a single cell or small group of cells, and distinguish those over normal tissue cell sequences. Further, as described in co-pending U.S. Provisional Patent Application No. 62/017,808, filed Jun. 26, 2014, the full disclosures of which is hereby incorporated herein by reference in its entirety for all purposes, one may also obtain phased sequence information from each cell, allowing clearer characterization of the haplotype variants within a cancer cell.
- fetal health or abnormality through the analysis of fetal cells is a difficult task using conventional techniques.
- relatively invasive procedures such as amniocentesis obtaining fetal cell samples can employ harvesting those cells from the maternal circulation.
- circulating fetal cells make up an extremely small fraction of the overall cellular population of that circulation.
- complex analyses are performed in order to characterize what of the obtained data is likely derived from fetal cells as opposed to maternal cells.
- the single cell characterization methods and systems described herein one can attribute genetic make up to individual cells, and categorize those cells as maternal or fetal based upon their respective genetic make-up.
- the genetic sequence of fetal cells may be used to identify any of a number of genetic disorders, including, e.g., aneuploidy such as Down syndrome, Edwards syndrome, and Patau syndrome.
- samples may, by their nature, be made up of diverse populations of cells and other material that “contaminate” the sample, relative to the cells for which the sample is being tested, e.g., environmental indicator organisms, toxic organisms, and the like for, e.g., environmental and food safety testing, victim and/or perpetrator cells in forensic analysis for sexual assault, and other violent crimes, and the like.
- neural cells can include long interspersed nuclear elements (LINEs), or ‘jumping’ genes that can move around the genome, which cause each neuron to differ from its neighbor cells.
- LINEs long interspersed nuclear elements
- research has shown that the number of LINEs in human brain exceeds that of other tissues, e.g., heart and liver tissue, with between 80 and 300 unique insertions (See, e.g., Coufal, N. G. et al. Nature 460, 1127-1131 (2009)).
- These differences have been postulated as being related to a person's susceptibility to neuro-logical disorders (see, e.g., Muotri, A. R. et al. Nature 468, 443-446 (2010)), or provide the brain with a diversity with which to respond to challenges.
- the methods described herein may be used in the sequencing and characterization of individual neural cells.
- the single cell analysis methods described herein are also useful in the analysis of gene expression, as noted above, both in terms of identification of RNA transcripts and their quantitation.
- the barcode oligonucleotides may be configured to prime, replicate and consequently yield barcoded fragments of RNA from individual cells.
- the barcode oligonucleotides may include mRNA specific priming sequences, e.g., poly-T primer segments that allow priming and replication of mRNA in a reverse transcription reaction or other targeted priming sequences.
- random RNA priming may be carried out using random N-mer primer segments of the barcode oligonucleotides.
- FIG. 6 provides a schematic of one example method for RNA expression analysis in individual cells using the methods described herein.
- a cell containing sample is sorted for viable cells, which are quantified and diluted for subsequent partitioning.
- the individual cells separately co-partitioned with gel beads bearing the barcoding oligonucleotides as described herein.
- the cells are lysed and the barcoded oligonucleotides released into the partitions at operation 606 , where they interact with and hybridize to the mRNA at operation 608 , e.g., by virtue of a poly-T primer sequence, which is complementary to the poly-A tail of the mRNA.
- a reverse transcription reaction is carried out at operation 610 to synthesize a cDNA transcript of the mRNA that includes the barcode sequence.
- the barcoded cDNA transcripts are then subjected to additional amplification at operation 612 , e.g., using a PCR process, purification at operation 614 , before they are placed on a nucleic acid sequencing system for determination of the cDNA sequence and its associated barcode sequence(s).
- operations 602 through 608 can occur while the reagents remain in their original droplet or partition, while operations 612 through 616 can occur in bulk (e.g., outside of the partition).
- a partition is a droplet in an emulsion
- the emulsion can be broken and the contents of the droplet pooled in order to complete operations 612 through 616 .
- barcode oligonucleotides may be digested with exonucleases after the emulsion is broken. Exonuclease activity can be inhibited by ethylenediaminetetraacetic acid (EDTA) following primer digestion.
- operation 610 may be performed either within the partitions based upon co-partitioning of the reverse transcription mixture, e.g., reverse transcriptase and associated reagents, or it may be performed in bulk.
- the structure of the barcode oligonucleotides may include a number of sequence elements in addition to the oligonucleotide barcode sequence.
- a barcode oligonucleotide for use in RNA analysis as described above is shown in FIG. 7 .
- the overall oligonucleotide 702 is coupled to a bead 704 by a releasable linkage 706 , such as a disulfide linker.
- the oligonucleotide may include functional sequences that are used in subsequent processing, such as functional sequence 708 , which may include one or more of a sequencer specific flow cell attachment sequence, e.g., a P5 sequence for Illumina sequencing systems, as well as sequencing primer sequences, e.g., a R1 primer for Illumina sequencing systems.
- a barcode sequence 710 is included within the structure for use in barcoding the sample RNA.
- An mRNA specific priming sequence, such as poly-T sequence 712 is also included in the oligonucleotide structure.
- An anchoring sequence segment 714 may be included to ensure that the poly-T sequence hybridizes at the sequence end of the mRNA.
- This anchoring sequence can include a random short sequence of nucleotides, e.g., 1-mer, 2-mer, 3-mer or longer sequence, which will ensure that the poly-T segment is more likely to hybridize at the sequence end of the poly-A tail of the mRNA.
- An additional sequence segment 716 may be provided within the oligonucleotide sequence. In some cases, this additional sequence provides a unique molecular sequence segment, e.g., as a random sequence (e.g., such as a random N-mer sequence) that varies across individual oligonucleotides coupled to a single bead, whereas barcode sequence 710 can be constant among oligonucleotides tethered to an individual bead.
- This unique sequence serves to provide a unique identifier of the starting mRNA molecule that was captured, in order to allow quantitation of the number of original expressed RNA.
- individual bead can include tens to hundreds of thousands or even millions of individual oligonucleotide molecules, where, as noted, the barcode segment can be constant or relatively constant for a given bead, but where the variable or unique sequence segment will vary across an individual bead.
- This unique molecular sequence segment may include from 5 to about 8 or more nucleotides within the sequence of the oligonucleotides.
- the unique molecular sequence segment can be 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 or 20 nucleotides in length or longer. In some cases, the unique molecular sequence segment can be at least 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 or 20 nucleotides in length or longer. In some cases, the unique molecular sequence segment can be at most 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 or 20 nucleotides in length or shorter.
- a cell is co-partitioned along with a barcode bearing bead and lysed while the barcoded oligonucleotides are released from the bead.
- the poly-T portion of the released barcode oligonucleotide then hybridizes to the poly-A tail of the mRNA.
- the poly-T segment then primes the reverse transcription of the mRNA to produce a cDNA transcript of the mRNA, but which includes each of the sequence segments 708 - 716 of the barcode oligonucleotide.
- the oligonucleotide 702 includes an anchoring sequence 714 , it will more likely hybridize to and prime reverse transcription at the sequence end of the poly-A tail of the mRNA.
- all of the cDNA transcripts of the individual mRNA molecules will include a common barcode sequence segment 710 .
- the transcripts made from different mRNA molecules within a given partition will vary at this unique sequence. This provides a quantitation feature that can be identifiable even following any subsequent amplification of the contents of a given partition, e.g., the number of unique segments associated with a common barcode can be indicative of the quantity of mRNA originating from a single partition, and thus, a single cell.
- the transcripts are then amplified, cleaned up and sequenced to identify the sequence of the cDNA transcript of the mRNA, as well as to sequence the barcode segment and the unique sequence segment.
- a poly-T primer sequence As noted elsewhere herein, while a poly-T primer sequence is described, other targeted or random priming sequences may also be used in priming the reverse transcription reaction. Likewise, although described as releasing the barcoded oligonucleotides into the partition along with the contents of the lysed cells, it will be appreciated that in some cases, the gel bead bound oligonucleotides may be used to hybridize ad capture the mRNA on the solid phase of the gel beads, in order to facilitate the separation of the RNA from other cell contents.
- FIG. 9A An additional example of a barcode oligonucleotide for use in RNA analysis, including messenger RNA (mRNA, including mRNA obtained from a cell) analysis, is shown in FIG. 9A .
- the overall oligonucleotide 902 can be coupled to a bead 904 by a releasable linkage 906 , such as a disulfide linker.
- the oligonucleotide may include functional sequences that are used in subsequent processing, such as functional sequence 908 , which may include a sequencer specific flow cell attachment sequence, e.g., a P5 sequence for Illumina sequencing systems, as well as functional sequence 910 , which may include sequencing primer sequences, e.g., a R1 primer binding site for Illumina sequencing systems.
- a barcode sequence 912 is included within the structure for use in barcoding the sample RNA.
- An RNA specific (e.g., mRNA specific) priming sequence, such as poly-T sequence 914 is also included in the oligonucleotide structure.
- An anchoring sequence segment (not shown) may be included to ensure that the poly-T sequence hybridizes at the sequence end of the mRNA.
- An additional sequence segment 916 may be provided within the oligonucleotide sequence.
- This additional sequence can provide a unique molecular sequence segment, e.g., as a random N-mer sequence that varies across individual oligonucleotides coupled to a single bead, whereas barcode sequence 912 can be constant among oligonucleotides tethered to an individual bead.
- this unique sequence can serve to provide a unique identifier of the starting mRNA molecule that was captured, in order to allow quantitation of the number of original expressed RNA, e.g., mRNA counting.
- individual beads can include tens to hundreds of thousands or even millions of individual oligonucleotide molecules, where, as noted, the barcode segment can be constant or relatively constant for a given bead, but where the variable or unique sequence segment will vary across an individual bead.
- a cell is co-partitioned along with a barcode bearing bead, switch oligo 924 , and other reagents such as reverse transcriptase, a reducing agent and dNTPs into a partition (e.g., a droplet in an emulsion).
- a partition e.g., a droplet in an emulsion
- the cell is lysed while the barcoded oligonucleotides 902 are released from the bead (e.g., via the action of the reducing agent) and the poly-T segment 914 of the released barcode oligonucleotide then hybridizes to the poly-A tail of mRNA 920 that is released from the cell.
- the poly-T segment 914 is extended in a reverse transcription reaction using the mRNA as a template to produce a cDNA transcript 922 complementary to the mRNA and also includes each of the sequence segments 908 , 912 , 910 , 916 and 914 of the barcode oligonucleotide.
- Terminal transferase activity of the reverse transcriptase can add additional bases to the cDNA transcript (e.g., polyC).
- the switch oligo 924 may then hybridize with the additional bases added to the cDNA transcript and facilitate template switching.
- a sequence complementary to the switch oligo sequence can then be incorporated into the cDNA transcript 922 via extension of the cDNA transcript 922 using the switch oligo 924 as a template.
- all of the cDNA transcripts of the individual mRNA molecules will include a common barcode sequence segment 912 . However, by including the unique random N-mer sequence 916 , the transcripts made from different mRNA molecules within a given partition will vary at this unique sequence.
- this provides a quantitation feature that can be identifiable even following any subsequent amplification of the contents of a given partition, e.g., the number of unique segments associated with a common barcode can be indicative of the quantity of mRNA originating from a single partition, and thus, a single cell.
- the cDNA transcript 922 is then amplified with primers 926 (e.g., PCR primers) in operation 954 .
- primers 926 e.g., PCR primers
- the amplified product is then purified (e.g., via solid phase reversible immobilization (SPRI)) in operation 956 .
- SPRI solid phase reversible immobilization
- the amplified product is then sheared, ligated to additional functional sequences, and further amplified (e.g., via PCR).
- the functional sequences may include a sequencer specific flow cell attachment sequence 930 , e.g., a P7 sequence for Illumina sequencing systems, as well as functional sequence 928 , which may include a sequencing primer binding site, e.g., for a R2 primer for Illumina sequencing systems, as well as functional sequence 932 , which may include a sample index, e.g., an i7 sample index sequence for Illumina sequencing systems.
- operations 950 and 952 can occur in the partition, while operations 954 , 956 and 958 can occur in bulk solution (e.g., in a pooled mixture outside of the partition).
- a partition is a droplet in an emulsion
- the emulsion can be broken and the contents of the droplet pooled in order to complete operations 954 , 956 and 958 .
- operation 954 may be completed in the partition.
- barcode oligonucleotides may be digested with exonucleases after the emulsion is broken. Exonuclease activity can be inhibited by ethylenediaminetetraacetic acid (EDTA) following primer digestion.
- EDTA ethylenediaminetetraacetic acid
- RNA e.g., cellular RNA
- functional sequence 908 may be a P7 sequence and functional sequence 910 may be a R2 primer binding site.
- the functional sequence 930 may be a P5 sequence
- functional sequence 928 may be a R1 primer binding site
- functional sequence 932 may be an i5 sample index sequence for Illumina sequencing systems.
- the configuration of the constructs generated by such a barcode oligonucleotide can help minimize (or avoid) sequencing of the poly-T sequence during sequencing.
- FIG. 9B Shown in FIG. 9B is another example method for RNA analysis, including cellular mRNA analysis.
- the switch oligo 924 is co-partitioned with the individual cell and barcoded bead along with reagents such as reverse transcriptase, a reducing agent and dNTPs into a partition (e.g., a droplet in an emulsion).
- the switch oligo 924 may be labeled with an additional tag 934 , e.g. biotin.
- the cell is lysed while the barcoded oligonucleotides 902 (e.g., as shown in FIG. 9A ) are released from the bead (e.g., via the action of the reducing agent).
- sequence 908 is a P7 sequence and sequence 910 is a R2 primer binding site. In other cases, sequence 908 is a P5 sequence and sequence 910 is a R1 primer binding site.
- the poly-T segment 914 of the released barcode oligonucleotide hybridizes to the poly-A tail of mRNA 920 that is released from the cell.
- the poly-T segment 914 is then extended in a reverse transcription reaction using the mRNA as a template to produce a cDNA transcript 922 complementary to the mRNA and also includes each of the sequence segments 908 , 912 , 910 , 916 and 914 of the barcode oligonucleotide.
- Terminal transferase activity of the reverse transcriptase can add additional bases to the cDNA transcript (e.g., polyC).
- the switch oligo 924 may then hybridize with the cDNA transcript and facilitate template switching.
- a sequence complementary to the switch oligo sequence can then be incorporated into the cDNA transcript 922 via extension of the cDNA transcript 922 using the switch oligo 924 as a template.
- an isolation operation 960 can be used to isolate the cDNA transcript 922 from the reagents and oligonucleotides in the partition.
- the additional tag 934 e.g.
- biotin can be contacted with an interacting tag 936 , e.g., streptavidin, which may be attached to a magnetic bead 938 .
- an interacting tag 936 e.g., streptavidin
- the cDNA can be isolated with a pull-down operation (e.g., via magnetic separation, centrifugation) before amplification (e.g., via PCR) in operation 955 , followed by purification (e.g., via solid phase reversible immobilization (SPRI)) in operation 957 and further processing (shearing, ligation of sequences 928 , 932 and 930 and subsequent amplification (e.g., via PCR)) in operation 959 .
- a pull-down operation e.g., via magnetic separation, centrifugation
- purification e.g., via solid phase reversible immobilization (SPRI)
- further processing shearing, ligation of sequences 928 , 932
- sequence 930 is a P5 sequence and sequence 928 is a R1 primer binding site and sequence 932 is an i5 sample index sequence.
- sequence 930 is a P7 sequence and sequence 928 is a R2 primer binding site and sequence 932 is an i7 sample index sequence.
- operations 951 and 953 can occur in the partition, while operations 960 , 955 , 957 and 959 can occur in bulk solution (e.g., in a pooled mixture outside of the partition).
- a partition is a droplet in an emulsion
- the emulsion can be broken and the contents of the droplet pooled in order to complete operation 960 .
- the operations 955 , 957 , and 959 can then be carried out following operation 960 after the transcripts are pooled for processing.
- FIG. 9C Shown in FIG. 9C is another example method for RNA analysis, including cellular mRNA analysis.
- the switch oligo 924 is co-partitioned with the individual cell and barcoded bead along with reagents such as reverse transcriptase, a reducing agent and dNTPs in a partition (e.g., a droplet in an emulsion).
- a partition e.g., a droplet in an emulsion
- the cell is lysed while the barcoded oligonucleotides 902 (e.g., as shown in FIG. 9A ) are released from the bead (e.g., via the action of the reducing agent).
- sequence 908 is a P7 sequence and sequence 910 is a R2 primer binding site.
- sequence 908 is a P5 sequence and sequence 910 is a R1 primer binding site.
- the poly-T segment 914 of the released barcode oligonucleotide then hybridizes to the poly-A tail of mRNA 920 that is released from the cell.
- the poly-T segment 914 is then extended in a reverse transcription reaction using the mRNA as a template to produce a cDNA transcript 922 complementary to the mRNA and also includes each of the sequence segments 908 , 912 , 910 , 916 and 914 of the barcode oligonucleotide. Terminal transferase activity of the reverse transcriptase can add additional bases to the cDNA transcript (e.g., polyC).
- the switch oligo 924 may then hybridize with the cDNA transcript and facilitate template switching.
- a sequence complementary to the switch oligo sequence can then be incorporated into the cDNA transcript 922 via extension of the cDNA transcript 922 using the switch oligo 924 as a template.
- mRNA 920 and cDNA transcript 922 are denatured in operation 962 .
- a second strand is extended from a primer 940 having an additional tag 942 , e.g. biotin, and hybridized to the cDNA transcript 922 .
- the biotin labeled second strand can be contacted with an interacting tag 936 , e.g.
- streptavidin which may be attached to a magnetic bead 938 .
- the cDNA can be isolated with a pull-down operation (e.g., via magnetic separation, centrifugation) before amplification (e.g., via polymerase chain reaction (PCR)) in operation 965 , followed by purification (e.g., via solid phase reversible immobilization (SPRI)) in operation 967 and further processing (shearing, ligation of sequences 928 , 932 and 930 and subsequent amplification (e.g., via PCR)) in operation 969 .
- PCR polymerase chain reaction
- SPRI solid phase reversible immobilization
- sequence 930 is a P5 sequence and sequence 928 is a R1 primer binding site and sequence 932 is an i5 sample index sequence.
- sequence 930 is a P7 sequence and sequence 928 is a R2 primer binding site and sequence 932 is an i7 sample index sequence.
- operations 961 and 963 can occur in the partition, while operations 962 , 964 , 965 , 967 , and 969 can occur in bulk (e.g., outside the partition). In the case where a partition is a droplet in an emulsion, the emulsion can be broken and the contents of the droplet pooled in order to complete operations 962 , 964 , 965 , 967 and 969 .
- FIG. 9D Shown in FIG. 9D is another example method for RNA analysis, including cellular mRNA analysis.
- the switch oligo 924 is co-partitioned with the individual cell and barcoded bead along with reagents such as reverse transcriptase, a reducing agent and dNTPs.
- the cell is lysed while the barcoded oligonucleotides 902 (e.g., as shown in FIG. 9A ) are released from the bead (e.g., via the action of the reducing agent).
- sequence 908 is a P7 sequence and sequence 910 is a R2 primer binding site.
- sequence 908 is a P5 sequence and sequence 910 is a R1 primer binding site.
- the poly-T segment 914 of the released barcode oligonucleotide then hybridizes to the poly-A tail of mRNA 920 that is released from the cell.
- the poly-T segment 914 is then extended in a reverse transcription reaction using the mRNA as a template to produce a cDNA transcript 922 complementary to the mRNA and also includes each of the sequence segments 908 , 912 , 910 , 916 and 914 of the barcode oligonucleotide. Terminal transferase activity of the reverse transcriptase can add additional bases to the cDNA transcript (e.g., polyC).
- the switch oligo 924 may then hybridize with the cDNA transcript and facilitate template switching.
- a sequence complementary to the switch oligo sequence can then be incorporated into the cDNA transcript 922 via extension of the cDNA transcript 922 using the switch oligo 924 as a template.
- the mRNA 920 , cDNA transcript 922 and switch oligo 924 can be denatured, and the cDNA transcript 922 can be hybridized with a capture oligonucleotide 944 labeled with an additional tag 946 , e.g. biotin.
- biotin-labeled capture oligonucleotide 944 which is hybridized to the cDNA transcript, can be contacted with an interacting tag 936 , e.g. streptavidin, which may be attached to a magnetic bead 938 .
- an interacting tag 936 e.g. streptavidin
- the cDNA transcript can be amplified (e.g., via PCR) with primers 926 at operation 975 , followed by purification (e.g., via solid phase reversible immobilization (SPRI)) in operation 977 and further processing (shearing, ligation of sequences 928 , 932 and 930 and subsequent amplification (e.g., via PCR)) in operation 979 .
- SPRI solid phase reversible immobilization
- sequence 930 is a P5 sequence and sequence 928 is a R1 primer binding site and sequence 932 is an i5 sample index sequence.
- sequence 930 is a P7 sequence and sequence 928 is a R2 primer binding site and sequence 932 is an i7 sample index sequence.
- operations 971 and 973 can occur in the partition, while operations 966 , 975 , 977 (purification), and 979 can occur in bulk (e.g., outside the partition).
- the emulsion can be broken and the contents of the droplet pooled in order to complete operations 966 , 975 , 977 and 979 .
- FIG. 9E Shown in FIG. 9E is another example method for RNA analysis, including cellular RNA analysis.
- an individual cell is co-partitioned along with a barcode bearing bead, a switch oligo 990 , and other reagents such as reverse transcriptase, a reducing agent and dNTPs into a partition (e.g., a droplet in an emulsion).
- a partition e.g., a droplet in an emulsion.
- the cell is lysed while the barcoded oligonucleotides (e.g., 902 as shown in FIG. 9A ) are released from the bead (e.g., via the action of the reducing agent).
- the barcoded oligonucleotides e.g., 902 as shown in FIG. 9A
- sequence 908 is a P7 sequence and sequence 910 is a R2 primer binding site. In other cases, sequence 908 is a P5 sequence and sequence 910 is a R1 primer binding site.
- the poly-T segment of the released barcode oligonucleotide then hybridizes to the poly-A tail of mRNA 920 released from the cell.
- the poly-T segment is then extended in a reverse transcription reaction to produce a cDNA transcript 922 complementary to the mRNA and also includes each of the sequence segments 908 , 912 , 910 , 916 and 914 of the barcode oligonucleotide.
- Terminal transferase activity of the reverse transcriptase can add additional bases to the cDNA transcript (e.g., polyC).
- the switch oligo 990 may then hybridize with the cDNA transcript and facilitate template switching.
- a sequence complementary to the switch oligo sequence and including a T7 promoter sequence, can be incorporated into the cDNA transcript 922 .
- a second strand is synthesized and at operation 970 the T7 promoter sequence can be used by T7 polymerase to produce RNA transcripts in in vitro transcription.
- the RNA transcripts can be purified (e.g., via solid phase reversible immobilization (SPRI)), reverse transcribed to form DNA transcripts, and a second strand can be synthesized for each of the DNA transcripts.
- the RNA transcripts can be contacted with a DNase (e.g., DNAase I) to break down residual DNA.
- a DNase e.g., DNAase I
- the DNA transcripts are then fragmented and ligated to additional functional sequences, such as sequences 928 , 932 and 930 and, in some cases, further amplified (e.g., via PCR).
- sequence 930 is a P5 sequence and sequence 928 is a R1 primer binding site and sequence 932 is an i5 sample index sequence.
- sequence 930 is a P7 sequence and sequence 928 is a R2 primer binding site and sequence 932 is an i7 sample index sequence.
- the DNA transcripts can be contacted with an RNase to break down residual RNA.
- operations 981 and 983 can occur in the partition, while operations 968 , 970 , 985 and 987 can occur in bulk (e.g., outside the partition).
- a partition is a droplet in an emulsion
- the emulsion can be broken and the contents of the droplet pooled in order to complete operations 968 , 970 , 985 and 987 .
- RNA analysis including messenger RNA (mRNA, including mRNA obtained from a cell) analysis
- mRNA messenger RNA
- FIG. 10 Another example of a barcode oligonucleotide for use in RNA analysis, including messenger RNA (mRNA, including mRNA obtained from a cell) analysis is shown in FIG. 10 .
- the overall oligonucleotide 1002 is coupled to a bead 1004 by a releasable linkage 1006 , such as a disulfide linker.
- the oligonucleotide may include functional sequences that are used in subsequent processing, such as functional sequence 1008 , which may include a sequencer specific flow cell attachment sequence, e.g., a P7 sequence, as well as functional sequence 1010 , which may include sequencing primer sequences, e.g., a R2 primer binding site.
- functional sequence 1008 which may include a sequencer specific flow cell attachment sequence, e.g., a P7 sequence
- a barcode sequence 1012 is included within the structure for use in barcoding the sample RNA.
- An RNA specific (e.g., mRNA specific) priming sequence, such as poly-T sequence 1014 may be included in the oligonucleotide structure.
- An anchoring sequence segment (not shown) may be included to ensure that the poly-T sequence hybridizes at the sequence end of the mRNA.
- An additional sequence segment 1016 may be provided within the oligonucleotide sequence. This additional sequence can provide a unique molecular sequence segment, as described elsewhere herein.
- An additional functional sequence 1020 may be included for in vitro transcription, e.g., a T7 RNA polymerase promoter sequence.
- individual beads can include tens to hundreds of thousands or even millions of individual oligonucleotide molecules, where, as noted, the barcode segment can be constant or relatively constant for a given bead, but where the variable or unique sequence segment will vary across an individual bead.
- a cell is co-partitioned along with a barcode bearing bead, and other reagents such as reverse transcriptase, reducing agent and dNTPs into a partition (e.g., a droplet in an emulsion).
- a partition e.g., a droplet in an emulsion.
- the cell is lysed while the barcoded oligonucleotides 1002 are released (e.g., via the action of the reducing agent) from the bead, and the poly-T segment 1014 of the released barcode oligonucleotide then hybridizes to the poly-A tail of mRNA 1020 .
- the poly-T segment is then extended in a reverse transcription reaction using the mRNA as template to produce a cDNA transcript 1022 of the mRNA and also includes each of the sequence segments 1020 , 1008 , 1012 , 1010 , 1016 , and 1014 of the barcode oligonucleotide.
- all of the cDNA transcripts of the individual mRNA molecules will include a common barcode sequence segment 1012 .
- the transcripts made from different mRNA molecules within a given partition will vary at this unique sequence.
- this provides a quantitation feature that can be identifiable even following any subsequent amplification of the contents of a given partition, e.g., the number of unique segments associated with a common barcode can be indicative of the quantity of mRNA originating from a single partition, and thus, a single cell.
- a second strand is synthesized and at operation 1056 the T7 promoter sequence can be used by T7 polymerase to produce RNA transcripts in in vitro transcription.
- the transcripts are fragmented (e.g., sheared), ligated to additional functional sequences, and reverse transcribed.
- the functional sequences may include a sequencer specific flow cell attachment sequence 1030 , e.g., a P5 sequence, as well as functional sequence 1028 , which may include sequencing primers, e.g., a R1 primer binding sequence, as well as functional sequence 1032 , which may include a sample index, e.g., an i5 sample index sequence.
- the RNA transcripts can be reverse transcribed to DNA, the DNA amplified (e.g., via PCR), and sequenced to identify the sequence of the cDNA transcript of the mRNA, as well as to sequence the barcode segment and the unique sequence segment.
- operations 1050 and 1052 can occur in the partition, while operations 1054 , 1056 , 1058 and 1060 can occur in bulk (e.g., outside the partition).
- operations 1054 , 1056 , 1058 and 1060 can occur in bulk (e.g., outside the partition).
- the emulsion can be broken and the contents of the droplet pooled in order to complete operations 1054 , 1056 , 1058 and 1060 .
- functional sequence 1008 may be a P5 sequence and functional sequence 1010 may be a R1 primer binding site.
- functional sequence 1030 may be a P7 sequence
- functional sequence 1028 may be a R2 primer binding site
- functional sequence 1032 may be an i7 sample index sequence.
- RNA analysis including messenger RNA (mRNA, including mRNA obtained from a cell) analysis is shown in FIG. 11 .
- the overall oligonucleotide 1102 is coupled to a bead 1104 by a releasable linkage 1106 , such as a disulfide linker.
- the oligonucleotide may include functional sequences that are used in subsequent processing, such as functional sequence 1108 , which may include a sequencer specific flow cell attachment sequence, e.g., a P5 sequence, as well as functional sequence 1110 , which may include sequencing primer sequences, e.g., a R1 primer binding site.
- sequence 1108 is a P7 sequence and sequence 1110 is a R2 primer binding site.
- a barcode sequence 1112 is included within the structure for use in barcoding the sample RNA.
- An additional sequence segment 1116 may be provided within the oligonucleotide sequence. In some cases, this additional sequence can provide a unique molecular sequence segment, as described elsewhere herein.
- An additional sequence 1114 may be included to facilitate template switching, e.g., polyG.
- individual beads can include tens to hundreds of thousands or even millions of individual oligonucleotide molecules, where, as noted, the barcode segment can be constant or relatively constant for a given bead, but where the variable or unique sequence segment will vary across an individual bead.
- a cell is co-partitioned along with a barcode bearing bead, poly-T sequence, and other reagents such as reverse transcriptase, a reducing agent and dNTPs into a partition (e.g., a droplet in an emulsion).
- a partition e.g., a droplet in an emulsion.
- the cell is lysed while the barcoded oligonucleotides are released from the bead (e.g., via the action of the reducing agent) and the poly-T sequence hybridizes to the poly-A tail of mRNA 1120 released from the cell.
- the poly-T sequence is then extended in a reverse transcription reaction using the mRNA as a template to produce a cDNA transcript 1122 complementary to the mRNA.
- Terminal transferase activity of the reverse transcriptase can add additional bases to the cDNA transcript (e.g., polyC).
- the additional bases added to the cDNA transcript, e.g., polyC can then to hybridize with 1114 of the barcoded oligonucleotide. This can facilitate template switching and a sequence complementary to the barcode oligonucleotide can be incorporated into the cDNA transcript.
- the transcripts can be further processed (e.g., amplified, portions removed, additional sequences added, etc.) and characterized as described elsewhere herein, e.g., by sequencing.
- the configuration of the constructs generated by such a method can help minimize (or avoid) sequencing of the poly-T sequence during sequencing.
- FIG. 12A An additional example of a barcode oligonucleotide for use in RNA analysis, including cellular RNA analysis is shown in FIG. 12A .
- the overall oligonucleotide 1202 is coupled to a bead 1204 by a releasable linkage 1206 , such as a disulfide linker.
- the oligonucleotide may include functional sequences that are used in subsequent processing, such as functional sequence 1208 , which may include a sequencer specific flow cell attachment sequence, e.g., a P5 sequence, as well as functional sequence 1210 , which may include sequencing primer sequences, e.g., a R1 primer binding site.
- sequence 1208 is a P7 sequence and sequence 1210 is a R2 primer binding site.
- a barcode sequence 1212 is included within the structure for use in barcoding the sample RNA.
- An additional sequence segment 1216 may be provided within the oligonucleotide sequence. In some cases, this additional sequence can provide a unique molecular sequence segment, as described elsewhere herein.
- individual beads can include tens to hundreds of thousands or even millions of individual oligonucleotide molecules, where, as noted, the barcode segment can be constant or relatively constant for a given bead, but where the variable or unique sequence segment will vary across an individual bead.
- a cell is co-partitioned along with a barcode bearing bead and other reagents such as RNA ligase and a reducing agent into a partition (e.g. a droplet in an emulsion).
- a partition e.g. a droplet in an emulsion.
- the cell is lysed while the barcoded oligonucleotides are released (e.g., via the action of the reducing agent) from the bead.
- the barcoded oligonucleotides can then be ligated to the 5′ end of mRNA transcripts while in the partitions by RNA ligase.
- Subsequent operations may include purification (e.g., via solid phase reversible immobilization (SPRI)) and further processing (shearing, ligation of functional sequences, and subsequent amplification (e.g., via PCR)), and these operations may occur in bulk (e.g., outside the partition).
- SPRI solid phase reversible immobilization
- further processing e.g., ligation of functional sequences, and subsequent amplification
- subsequent operations may occur in bulk (e.g., outside the partition).
- a partition is a droplet in an emulsion
- the emulsion can be broken and the contents of the droplet pooled for the additional operations.
- FIG. 12B An additional example of a barcode oligonucleotide for use in RNA analysis, including cellular RNA analysis is shown in FIG. 12B .
- the overall oligonucleotide 1222 is coupled to a bead 1224 by a releasable linkage 1226 , such as a disulfide linker.
- the oligonucleotide may include functional sequences that are used in subsequent processing, such as functional sequence 1228 , which may include a sequencer specific flow cell attachment sequence, e.g., a P5 sequence, as well as functional sequence 1230 , which may include sequencing primer sequences, e.g., a R1 primer binding site.
- sequence 1228 is a P7 sequence and sequence 1230 is a R2 primer binding site.
- a barcode sequence 1232 is included within the structure for use in barcoding the sample RNA.
- a priming sequence 1234 (e.g., a random priming sequence) can also be included in the oligonucleotide structure, e.g., a random hexamer.
- An additional sequence segment 1236 may be provided within the oligonucleotide sequence. In some cases, this additional sequence provides a unique molecular sequence segment, as described elsewhere herein.
- individual beads can include tens to hundreds of thousands or even millions of individual oligonucleotide molecules, where, as noted, the barcode segment can be constant or relatively constant for a given bead, but where the variable or unique sequence segment will vary across an individual bead.
- the barcode segment can be constant or relatively constant for a given bead, but where the variable or unique sequence segment will vary across an individual bead.
- a cell is co-partitioned along with a barcode bearing bead and additional reagents such as reverse transcriptase, a reducing agent and dNTPs into a partition (e.g., a droplet in an emulsion).
- the cell is lysed while the barcoded oligonucleotides are released from the bead (e.g., via the action of the reducing agent).
- sequence 1228 is a P7 sequence and sequence 1230 is a R2 primer binding site.
- sequence 1228 is a P5 sequence and sequence 1230 is a R1 primer binding site.
- the priming sequence 1234 of random hexamers can randomly hybridize cellular mRNA.
- the random hexamer sequence can then be extended in a reverse transcription reaction using mRNA from the cell as a template to produce a cDNA transcript complementary to the mRNA and also includes each of the sequence segments 1228 , 1232 , 1230 , 1236 , and 1234 of the barcode oligonucleotide.
- Subsequent operations may include purification (e.g., via solid phase reversible immobilization (SPRI)), further processing (shearing, ligation of functional sequences, and subsequent amplification (e.g., via PCR)), and these operations may occur in bulk (e.g., outside the partition).
- SPRI solid phase reversible immobilization
- a partition is a droplet in an emulsion
- the emulsion can be broken and the contents of the droplet pooled for additional operations.
- Additional reagents that may be co-partitioned along with the barcode bearing bead may include oligonucleotides to block ribosomal RNA (rRNA) and nucleases to digest genomic DNA and cDNA from cells.
- rRNA removal agents may be applied during additional processing operations.
- the configuration of the constructs generated by such a method can help minimize (or avoid) sequencing of the poly-T sequence during sequencing.
- the priming sequence 1234 may be a random N-mer.
- sequence 1228 is a P7 sequence and sequence 1230 is a R2 primer binding site.
- sequence 1228 is a P5 sequence and sequence 1230 is a R1 primer binding site.
- the individual cell is co-partitioned along with a barcode bearing bead, poly-T sequence, and other reagents such as reverse transcriptase, polymerase, a reducing agent and dNTPs into a partition (e.g., droplet in an emulsion).
- the cell is lysed while the barcoded oligonucleotides are released from the bead (e.g., via the action of the reducing agent) and the poly-T sequence hybridizes to the poly-A tail of cellular mRNA.
- a reverse transcription reaction using the mRNA as template, cDNA transcripts of cellular mRNA can be produced.
- the RNA can then be degraded with an RNase.
- the priming sequence 1234 in the barcoded oligonucleotide can then randomly hybridize to the cDNA transcripts.
- the oligonucleotides can be extended using polymerase enzymes and other extension reagents co-partitioned with the bead and cell similar to as shown in FIG.
- amplification products e.g., barcoded fragments
- the barcoded nucleic acid fragments may, in some cases subjected to further processing (e.g., amplification, addition of additional sequences, clean up processes, etc. as described elsewhere herein) characterized, e.g., through sequence analysis.
- sequencing signals can come from full length RNA.
- the processes and systems described herein may also be used to characterize individual cells as a way to provide an overall profile of a cellular, or other organismal population.
- a variety of applications require the evaluation of the presence and quantification of different cell or organism types within a population of cells, including, for example, microbiome analysis and characterization, environmental testing, food safety testing, epidemiological analysis, e.g., in tracing contamination or the like.
- the analysis processes described above may be used to individually characterize, sequence and/or identify large numbers of individual cells within a population. This characterization may then be used to assemble an overall profile of the originating population, which can provide important prognostic and diagnostic information.
- shifts in human microbiomes including, e.g., gut, buccal, epidermal microbiomes, etc.
- single cell analysis methods and systems described herein one can again, characterize, sequence and identify individual cells in an overall population, and identify shifts within that population that may be indicative of diagnostic ally relevant factors.
- sequencing of bacterial 16S ribosomal RNA genes has been used as a highly accurate method for taxonomic classification of bacteria.
- Using the targeted amplification and sequencing processes described above can provide identification of individual cells within a population of cells.
- identification and diagnosis of infection or potential infection may also benefit from the single cell analyses described herein, e.g., to identify microbial species present in large mixes of other cells or other biological material, cells and/or nucleic acids, including the environments described above, as well as any other diagnostically relevant environments, e.g., cerebrospinal fluid, blood, fecal or intestinal samples, or the like.
- the foregoing analyses may also be particularly useful in the characterization of potential drug resistance of different cells, e.g., cancer cells, bacterial pathogens, etc., through the analysis of distribution and profiling of different resistance markers/mutations across cell populations in a given sample. Additionally, characterization of shifts in these markers/mutations across populations of cells over time can provide valuable insight into the progression, alteration, prevention, and treatment of a variety of diseases characterized by such drug resistance issues.
- any of a variety of individual biological organisms, or components of organisms are encompassed within this description, including, for example, cells, viruses, organelles, cellular inclusions, vesicles, or the like. Additionally, where referring to cells, it will be appreciated that such reference includes any type of cell, including without limitation prokaryotic cells, eukaryotic cells, bacterial, fungal, plant, mammalian, or other animal cell types, mycoplasmas, normal tissue cells, tumor cells, or any other cell type, whether derived from single cell or multicellular organisms.
- analysis of different environmental samples to profile the microbial organisms, viruses, or other biological contaminants that are present within such samples can provide important information about disease epidemiology, and potentially aid in forecasting disease outbreaks, epidemics an pandemics.
- a sample is provided that contains cells that are to be analyzed and characterized as to their cell surface proteins.
- a library of antibodies, antibody fragments, or other molecules having a binding affinity to the cell surface proteins or antigens (or other cell features) for which the cell is to be characterized also referred to herein as cell surface feature binding groups.
- binding groups can include a reporter molecule that is indicative of the cell surface feature to which the binding group binds.
- a binding group type that is specific to one type of cell surface feature will comprise a first reporter molecule, while a binding group type that is specific to a different cell surface feature will have a different reporter molecule associated with it.
- these reporter molecules will comprise oligonucleotide sequences. Oligonucleotide based reporter molecules provide advantages of being able to generate significant diversity in terms of sequence, while also being readily attachable to most biomolecules, e.g., antibodies, etc., as well as being readily detected, e.g., using sequencing or array technologies.
- the binding groups include oligonucleotides attached to them.
- a first binding group type e.g., antibodies to a first type of cell surface feature
- a reporter oligonucleotide that has a first nucleotide sequence.
- Different binding group types e.g., antibodies having binding affinity for other, different cell surface features
- reporter oligonucleotides that comprise different nucleotide sequences, e.g., having a partially or completely different nucleotide sequence.
- the reporter oligonucleotide sequence may be known and readily identifiable as being associated with the known cell surface feature binding group.
- oligonucleotides may be directly coupled to the binding group, or they may be attached to a bead, molecular lattice, e.g., a linear, globular, cross-linked, or other polymer, or other framework that is attached or otherwise associated with the binding group, which allows attachment of multiple reporter oligonucleotides to a single binding group.
- molecular lattice e.g., a linear, globular, cross-linked, or other polymer, or other framework that is attached or otherwise associated with the binding group, which allows attachment of multiple reporter oligonucleotides to a single binding group.
- reporter molecules can comprise the same sequence, or a particular binding group will include a known set of reporter oligonucleotide sequences.
- the reporter molecules can be different and attributable to the particular binding group.
- Attachment of the reporter groups to the binding groups may be achieved through any of a variety of direct or indirect, covalent or non-covalent associations or attachments.
- oligonucleotide reporter groups associated with antibody based binding groups such oligonucleotides may be covalently attached to a portion of an antibody or antibody fragment using chemical conjugation techniques (e.g., Lightning-Link® antibody labeling kits available from Innova Biosciences), as well as other non-covalent attachment mechanisms, e.g., using biotinylated antibodies and oligonucleotides (or beads that include one or more biotinylated linker, coupled to oligonucleotides) with an avidin or streptavidin linker.
- chemical conjugation techniques e.g., Lightning-Link® antibody labeling kits available from Innova Biosciences
- other non-covalent attachment mechanisms e.g., using biotinylated antibodies and oligonucleotides (or beads that include one or more biotinylated
- Antibody and oligonucleotide biotinylation techniques are available (See, e.g., Fang, et al., Fluoride - Cleavable Biotinylation Phosphoramidite for 5′- end - Labeling and Affinity Purification of Synthetic Oligonucleotides , Nucleic Acids Res. Jan. 15, 2003; 31(2):708-715, DNA 3′ End Biotinylation Kit, available from Thermo Scientific, the full disclosures of which are incorporated herein by reference in their entirety for all purposes).
- protein and peptide biotinylation techniques have been developed and are readily available (See, e.g., U.S. Pat. No. 6,265,552, the full disclosures of which are incorporated herein by reference in their entirety for all purposes).
- the reporter oligonucleotides may be provided having any of a range of different lengths, depending upon the diversity of reporter molecules desired or a given analysis, the sequence detection scheme employed, and the like. In some cases, these reporter sequences can be greater than about 5 nucleotides in length, greater than about 10 nucleotides in length, greater than about 20, 30, 40, 50, 60, 70, 80, 90, 100, 120, 150 or even 200 nucleotides in length. In some cases, these reporter nucleotides may be less than about 250 nucleotides in length, less than about 200, 180, 150, 120 100, 90, 80, 70, 60, 50, 40, or even 30 nucleotides in length.
- the reporter oligonucleotides may be selected to provide barcoded products that are already sized, and otherwise configured to be analyzed on a sequencing system. For example, these sequences may be provided at a length that ideally creates sequenceable products of a desired length for particular sequencing systems. Likewise, these reporter oligonucleotides may include additional sequence elements, in addition to the reporter sequence, such as sequencer attachment sequences, sequencing primer sequences, amplification primer sequences, or the complements to any of these.
- a cell-containing sample is incubated with the binding molecules and their associated reporter oligonucleotides, for any of the cell surface features desired to be analyzed.
- the cells are washed to remove unbound binding groups.
- the cells are partitioned into separate partitions, e.g., droplets, along with the barcode carrying beads described above, where each partition includes a limited number of cells, e.g., in some cases, a single cell.
- the barcoded replicates of the reporter molecules may additionally include functional sequences, such as primer sequences, attachment sequences or the like.
- the barcoded reporter oligonucleotides are then subjected to sequence analysis to identify which reporter oligonucleotides bound to the cells within the partitions. Further, by also sequencing the associated barcode sequence, one can identify that a given cell surface feature likely came from the same cell as other, different cell surface features, whose reporter sequences include the same barcode sequence, i.e., they were derived from the same partition.
- a cell surface profile of individual cells Based upon the reporter molecules that emanate from an individual partition based upon the presence of the barcode sequence, one may then create a cell surface profile of individual cells from a population of cells. Profiles of individual cells or populations of cells may be compared to profiles from other cells, e.g., ‘normal’ cells, to identify variations in cell surface features, which may provide diagnostically relevant information. In particular, these profiles may be particularly useful in the diagnosis of a variety of disorders that are characterized by variations in cell surface receptors, such as cancer and other disorders.
- microfluidic devices used for partitioning the cells as described above.
- Such microfluidic devices can comprise channel networks for carrying out the partitioning process like those set forth in FIGS. 1 and 2 . Examples of particularly useful microfluidic devices are described in U.S. Provisional Patent Application No. 61/977,804, filed Apr. 4, 2014, and incorporated herein by reference in its entirety for all purposes. Briefly, these microfluidic devices can comprise channel networks, such as those described herein, for partitioning cells into separate partitions, and co-partitioning such cells with oligonucleotide barcode library members, e.g., disposed on beads.
- channel networks can be disposed within a solid body, e.g., a glass, semiconductor or polymer body structure in which the channels are defined, where those channels communicate at their termini with reservoirs for receiving the various input fluids, and for the ultimate deposition of the partitioned cells, etc., from the output of the channel networks.
- a reservoir fluidly coupled to channel 202 may be provided with an aqueous suspension of cells 214
- a reservoir coupled to channel 204 may be provided with an aqueous suspension of beads 216 carrying the oligonucleotides.
- Channel segments 206 and 208 may be provided with a non-aqueous solution, e.g., an oil, into which the aqueous fluids are partitioned as droplets at the channel junction 212 .
- a non-aqueous solution e.g., an oil
- an outlet reservoir may be fluidly coupled to channel 210 into which the partitioned cells and beads can be delivered and from which they may be harvested.
- the channel segments may be coupled to any of a variety of different fluid sources or receiving components, including tubing, manifolds, or fluidic components of other systems.
- kits for analyzing individual cells or small populations of cells may include one, two, three, four, five or more, up to all of partitioning fluids, including both aqueous buffers and non-aqueous partitioning fluids or oils, nucleic acid barcode libraries that are releasably associated with beads, as described herein, microfluidic devices, reagents for disrupting cells amplifying nucleic acids, and providing additional functional sequences on fragments of cellular nucleic acids or replicates thereof, as well as instructions for using any of the foregoing in the methods described herein.
- FIG. 17 shows a computer system 1701 that is programmed or otherwise configured to implement methods of the disclosure including nucleic acid sequencing methods, interpretation of nucleic acid sequencing data and analysis of cellular nucleic acids, such as RNA (e.g., mRNA), and characterization of cells from sequencing data.
- the computer system 1701 can be an electronic device of a user or a computer system that is remotely located with respect to the electronic device.
- the electronic device can be a mobile electronic device.
- the computer system 1701 includes a central processing unit (CPU, also “processor” and “computer processor” herein) 1705 , which can be a single core or multi core processor, or a plurality of processors for parallel processing.
- the computer system 1701 also includes memory or memory location 1710 (e.g., random-access memory, read-only memory, flash memory), electronic storage unit 1715 (e.g., hard disk), communication interface 1720 (e.g., network adapter) for communicating with one or more other systems, and peripheral devices 1725 , such as cache, other memory, data storage and/or electronic display adapters.
- the memory 1710 , storage unit 1715 , interface 1720 and peripheral devices 1725 are in communication with the CPU 1705 through a communication bus (solid lines), such as a motherboard.
- the storage unit 1715 can be a data storage unit (or data repository) for storing data.
- the computer system 1701 can be operatively coupled to a computer network (“network”) 1730 with the aid of the communication interface 1720 .
- the network 1730 can be the Internet, an internet and/or extranet, or an intranet and/or extranet that is in communication with the Internet.
- the network 1730 in some cases is a telecommunication and/or data network.
- the network 1730 can include one or more computer servers, which can enable distributed computing, such as cloud computing.
- the network 1730 in some cases with the aid of the computer system 1701 , can implement a peer-to-peer network, which may enable devices coupled to the computer system 1701 to behave as a client or a server.
- the CPU 1705 can execute a sequence of machine-readable instructions, which can be embodied in a program or software.
- the instructions may be stored in a memory location, such as the memory 1710 .
- the instructions can be directed to the CPU 1705 , which can subsequently program or otherwise configure the CPU 1705 to implement methods of the present disclosure. Examples of operations performed by the CPU 1705 can include fetch, decode, execute, and writeback.
- the CPU 1705 can be part of a circuit, such as an integrated circuit.
- a circuit such as an integrated circuit.
- One or more other components of the system 1701 can be included in the circuit.
- the circuit is an application specific integrated circuit (ASIC).
- the storage unit 1715 can store files, such as drivers, libraries and saved programs.
- the storage unit 1715 can store user data, e.g., user preferences and user programs.
- the computer system 1701 in some cases can include one or more additional data storage units that are external to the computer system 1701 , such as located on a remote server that is in communication with the computer system 1701 through an intranet or the Internet.
- the computer system 1701 can communicate with one or more remote computer systems through the network 1730 .
- the computer system 1701 can communicate with a remote computer system of a user.
- remote computer systems include personal computers (e.g., portable PC), slate or tablet PC's (e.g., Apple® iPad, Samsung® Galaxy Tab), telephones, Smart phones (e.g., Apple® iPhone, Android-enabled device, Blackberry®), or personal digital assistants.
- the user can access the computer system 1701 via the network 1730 .
- Methods as described herein can be implemented by way of machine (e.g., computer processor) executable code stored on an electronic storage location of the computer system 1701 , such as, for example, on the memory 1710 or electronic storage unit 1715 .
- the machine executable or machine readable code can be provided in the form of software.
- the code can be executed by the processor 1705 .
- the code can be retrieved from the storage unit 1715 and stored on the memory 1710 for ready access by the processor 1705 .
- the electronic storage unit 1715 can be precluded, and machine-executable instructions are stored on memory 1710 .
- the code can be pre-compiled and configured for use with a machine having a processor adapted to execute the code, or can be compiled during runtime.
- the code can be supplied in a programming language that can be selected to enable the code to execute in a pre-compiled or as-compiled fashion.
- aspects of the systems and methods provided herein can be embodied in programming.
- Various aspects of the technology may be thought of as “products” or “articles of manufacture” typically in the form of machine (or processor) executable code and/or associated data that is carried on or embodied in a type of machine readable medium.
- Machine-executable code can be stored on an electronic storage unit, such as memory (e.g., read-only memory, random-access memory, flash memory) or a hard disk.
- “Storage” type media can include any or all of the tangible memory of the computers, processors or the like, or associated modules thereof, such as various semiconductor memories, tape drives, disk drives and the like, which may provide non-transitory storage at any time for the software programming. All or portions of the software may at times be communicated through the Internet or various other telecommunication networks. Such communications, for example, may enable loading of the software from one computer or processor into another, for example, from a management server or host computer into the computer platform of an application server.
- another type of media that may bear the software elements includes optical, electrical and electromagnetic waves, such as used across physical interfaces between local devices, through wired and optical landline networks and over various air-links.
- a machine readable medium such as computer-executable code
- a tangible storage medium such as computer-executable code
- Non-volatile storage media include, for example, optical or magnetic disks, such as any of the storage devices in any computer(s) or the like, such as may be used to implement the databases, etc. shown in the drawings.
- Volatile storage media include dynamic memory, such as main memory of such a computer platform.
- Tangible transmission media include coaxial cables; copper wire and fiber optics, including the wires that comprise a bus within a computer system.
- Carrier-wave transmission media may take the form of electric or electromagnetic signals, or acoustic or light waves such as those generated during radio frequency (RF) and infrared (IR) data communications.
- RF radio frequency
- IR infrared
- Common forms of computer-readable media therefore include for example: a floppy disk, a flexible disk, hard disk, magnetic tape, any other magnetic medium, a CD-ROM, DVD or DVD-ROM, any other optical medium, punch cards paper tape, any other physical storage medium with patterns of holes, a RAM, a ROM, a PROM and EPROM, a FLASH-EPROM, any other memory chip or cartridge, a carrier wave transporting data or instructions, cables or links transporting such a carrier wave, or any other medium from which a computer may read programming code and/or data.
- Many of these forms of computer readable media may be involved in carrying one or more sequences of one or more instructions to a processor for execution.
- the computer system 1701 can include or be in communication with an electronic display 1735 that comprises a user interface (UI) 1740 for providing, for example, results of nucleic acid sequencing, analysis of nucleic acid sequencing data, characterization of nucleic acid sequencing samples, cell characterizations, etc.
- UI user interface
- Examples of UI's include, without limitation, a graphical user interface (GUI) and web-based user interface.
- Methods and systems of the present disclosure can be implemented by way of one or more algorithms.
- An algorithm can be implemented by way of software upon execution by the central processing unit 1705 .
- the algorithm can, for example, initiate nucleic acid sequencing, process nucleic acid sequencing data, interpret nucleic acid sequencing results, characterize nucleic acid samples, characterize cells, etc.
- reverse transcription with template switching and cDNA amplification is performed in emulsion droplets with operations as shown in FIG. 9A .
- the reaction mixture that is partitioned for reverse transcription and cDNA amplification includes 1,000 cells or 10,000 cells or 10 ng of RNA, beads bearing barcoded oligonucleotides/0.2% Tx-100/5 ⁇ Kapa buffer, 2 ⁇ Kapa HS HiFi Ready Mix, 4 ⁇ M switch oligo, and Smartscribe. Where cells are present, the mixture is partitioned such that a majority or all of the droplets comprise a single cell and single bead.
- the cells are lysed while the barcoded oligonucleotides are released from the bead, and the poly-T segment of the barcoded oligonucleotide hybridizes to the poly-A tail of mRNA that is released from the cell as in operation 950 .
- the poly-T segment is extended in a reverse transcription reaction as in operation 952 and the cDNA transcript is amplified as in operation 954 .
- the thermal cycling conditions are 42° C. for 130 minutes; 98° C. for 2 min; and 35 cycles of the following 98° C. for 15 sec, 60° C. for 20 sec, and 72° C. for 6 min. Following thermal cycling, the emulsion is broken and the transcripts are purified with Dynabeads and 0.6 ⁇ SPRI as in operation 956 .
- the yield from template switch reverse transcription and PCR in emulsions is shown for 1,000 cells in FIG. 13A and 10,000 cells in FIG. 13C and 10 ng of RNA in FIG. 13B (Smartscribe line).
- the cDNA transcripts from RT and PCR performed in emulsions for 10 ng RNA is sheared and ligated to functional sequences, cleaned up with 0.8 ⁇ SPRI, and is further amplified by PCR as in operation 958 .
- the amplification product is cleaned up with 0.8 ⁇ SPRI.
- the yield from this processing is shown in FIG. 13B (SSII line).
- reverse transcription with template switching and cDNA amplification is performed in emulsion droplets with operations as shown in FIG. 9A .
- the reaction mixture that is partitioned for reverse transcription and cDNA amplification includes Jurkat cells, beads bearing barcoded oligonucleotides/0.2% TritonX-100/5 ⁇ Kapa buffer, 2 ⁇ Kapa HS HiFi Ready Mix, 4 ⁇ M switch oligo, and Smartscribe.
- the mixture is partitioned such that a majority or all of the droplets comprise a single cell and single bead.
- the cells are lysed while the barcoded oligonucleotides are released from the bead, and the poly-T segment of the barcoded oligonucleotide hybridizes to the poly-A tail of mRNA that is released from the cell as in operation 950 .
- the poly-T segment is extended in a reverse transcription reaction as in operation 952 and the cDNA transcript is amplified as in operation 954 .
- the thermal cycling conditions are 42° C. for 130 minutes; 98° C. for 2 min; and 35 cycles of the following 98° C. for 15 sec, 60° C. for 20 sec, and 72° C. for 6 min.
- reverse transcription is performed in emulsion droplets and cDNA amplification is performed in bulk in a manner similar to that as shown in FIG. 9C .
- the reaction mixture that is partitioned for reverse transcription includes beads bearing barcoded oligonucleotides, 10 ng Jurkat RNA (e.g., Jurkat mRNA), 5 ⁇ First-Strand buffer, and Smartscribe.
- the barcoded oligonucleotides are released from the bead, and the poly-T segment of the barcoded oligonucleotide hybridizes to the poly-A tail of the RNA as in operation 961 .
- the poly-T segment is extended in a reverse transcription reaction as in operation 963 .
- the thermal cycling conditions for reverse transcription are one cycle at 42° C. for 2 hours and one cycle at 70° C. for 10 min. Following thermal cycling, the emulsion is broken and RNA and cDNA transcripts are denatured as in operation 962 . A second strand is then synthesized by primer extension with a primer having a biotin tag as in operation 964 .
- the reaction conditions for this primer extension include cDNA transcript as the first strand and biotinylated extension primer ranging in concentration from 0.5-3.0 ⁇ M.
- the thermal cycling conditions are one cycle at 98° C. for 3 min and one cycle of 98° C. for 15 sec, 60° C. for 20 sec, and 72° C. for 30 min.
- the second strand is pulled down with Dynabeads MyOne Streptavidin C1 and T1, and cleaned-up with Agilent SureSelect XT buffers.
- the second strand is pre-amplified via PCR as in operation 965 with the following cycling conditions—one cycle at 98° C. for 3 min and one cycle of 98° C. for 15 sec, 60° C. for 20 sec, and 72° C. for 30 min.
- the yield for various concentrations of biotinylated primer (0.5 ⁇ M, 1.0 ⁇ M, 2.0 ⁇ M, and 3.0 ⁇ M) is shown in FIG. 15 .
- the mixture that is partitioned for reverse transcription includes beads bearing barcoded oligonucleotides which also include a T7 RNA polymerase promoter sequence, 10 ng human RNA (e.g., human mRNA), 5 ⁇ First-Strand buffer, and Smartscribe.
- the mixture is partitioned such that a majority or all of the droplets comprise a single bead.
- the barcoded oligonucleotides are released from the bead, and the poly-T segment of the barcoded oligonucleotide hybridizes to the poly-A tail of the RNA as in operation 1050 .
- the poly-T segment is extended in a reverse transcription reaction as in operation 1052 .
- the thermal cycling conditions are one cycle at 42° C. for 2 hours and one cycle at 70° C. for 10 min. Following thermal cycling, the emulsion is broken and the remaining operations are performed in bulk.
- a second strand is then synthesized by primer extension as in operation 1054 .
- the reaction conditions for this primer extension include cDNA transcript as template and extension primer.
- the thermal cycling conditions are one cycle at 98° C. for 3 min and one cycle of 98° C. for 15 sec, 60° C. for 20 sec, and 72° C. for 30 min. Following this primer extension, the second strand is purified with 0.6 ⁇ SPRI.
- in vitro transcription is then performed to produce RNA transcripts. In vitro transcription is performed overnight, and the transcripts are purified with 0.6 ⁇ SPRI. The RNA yields from in vitro transcription are shown in FIG. 16 .
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WO2015200893A2 (en) | 2015-12-30 |
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STCB | Information on status: application discontinuation |
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