Method to perform high-throughput single cell genomic and phenotypic analyses
The invention provides methods of performing multi-parameter analysis of single cells. Specifically, the present invention is based, in part, on leveraging a separation of reaction volume scales to conduct high-throughput single cell multi-parameter measurements and library preparation on the same single cell using double emulsion micro-droplets and sorting using flow cytometry.
1. A method of producing a library of single cells for multi-parameter analysis, comprising:
(a) generating a population of double emulsion droplets at least some of which comprise single cells encapsulated therein, wherein the double emulsion droplets further comprise reagents for a first single cell assay to analyze a first parameter;
(b) incubating the droplets for a time sufficient to generate a reaction product for the first single cell assay;
(c) sorting the population of droplets by flow cytometry to select for single droplets comprising one or more cells, or the contents of one or more cells;
(d) distributing single droplets that comprise single cells into separate dry compartments;
(e) breaking individual droplets in each separate dry compartment by shear or osmotic force to produce a plurality of individual compartments each with the content of a single droplet;
(f) diluting the contents of individual compartments by at least 500-fold to provide a diluted reaction volume; and
(g) measuring a second parameter in a second single cell assay in the diluted reaction volume.
2. The method of claim 1 , further comprising a step of processing the contents of the diluted reaction volume for analysis of the reaction product for the first single cell assay.
3. The method of claim 1 , wherein Step (f) employs a diluent that comprises reagents that differ from the first single cell assay reagents.
4. The method of claim 1 , wherein the droplets of Step (a) comprise cell-lysing buffer.
5. The method of claim 1 , wherein Step (f) comprises diluting the contents by 1,000-fold to 100,000-fold.
6. The method of claim 1 , wherein Step (c) comprises sorting based on DNA content.
7. The method of claim 6 , wherein at least some of the droplets selected in Step (c) contain haploid cells, or the contents of said haploid cells; at least some of the droplets selected in Step (c) contain diploid cells or the contents of said diploid cells; or at least some of the droplets selected in Step (c) contain cells having a ploidy greater than diploid, or the content of said cells having a ploidy greater than diploid.
8. The method of claim 1 , wherein the cells are labeled with a fluorescent DNA intercalating dye for sorting by flow cytometry; the cells are labeled with a fluorescent assay reagent for sorting by flow cytometry; or the cells are labeled with a fluorescent dye coupled to a protein for sorting by flow cytometry, optionally where the protein is an antibody.
9. The method of claim 1 , wherein the reaction product generated in Step (b) is not fluorescently labeled; the reaction product generated in Step (b) is not detectably labeled; and/or the presence, absence or amount of the reaction product generated in Step (b) is not a basis for sorting droplets in Step (c).
10. The method of claim 1 , wherein the first single cell assay and second single cell assay are selected from the group consisting of the following:
the first single cell assay is ATAC-Seq and the second single cell assay is an RNA analysis assay, optionally RNA-Seq; whole genome sequencing; or a protein detection assay; or
the first single cell assay is a protein detection assay and the second single cell assay is RNA-Seq; ATAC-Seq, or whole genome sequencing;
or the first single cell assay detects expression of at least one gene of interest and the second single cell assay is an RNA-Seq assay.
11. The method of claim 1 , wherein the first single cell assay detects expression of at least one gene of interest and the second single cell assay is an RNA-Seq assay and:
the first single cell assay comprises an RT-PCR amplification reaction to specifically detect expression of the least one gene of interest, wherein the RT-PCR reaction comprises an oligonucleotide labeled with a detectable label, and wherein the oligonucleotide specifically hybridizes to a target nucleic acid sequence in the gene of interest; and
the sorting Step (c) comprises selecting droplets that contain a signal from the detectable label.
12. The method of claim 1 , wherein the double emulsion droplet is about 20-125 micrometers in diameter.
13. The method of claim 2 , wherein the processing step comprises an amplification reaction to index the contents of the compartments by the addition of barcodes unique to each compartment; and pooling the contents of the individual compartments for further analysis, optionally wherein the pooled contents are sequenced by massively parallel sequencing.
14. The method of claim 1 , wherein the compartments are components of a multi-well plate, optionally where the multi-well plate comprises 96, 384, or 1536 wells.
15. The method of claim 1 , wherein greater than 50% of the compartments contain content from a single cell; or greater than 80% of the compartments contain content from a single cell.
16. The method of claim 1 , wherein the single cells of (a) are eukaryotic cells.
17. The method of claim 16 , wherein the eukaryotic cells are mammalian cells.
18. The method of claim 17 , wherein the mammalian cells are human cells.
19. The method of claim 17 , wherein the cells are tumor cells, embryonic stem cells, neural cells, or lymphocytes.
20. The method of claim 1 , wherein Step (c) comprises selecting for droplets in which a reaction occurred.