Analysis of nucleic acids associated with single cells using nucleic acid barcodes
Provided herein are methods and compositions for analyzing nucleic acids associated with single cells using nucleic acid barcodes. According to some embodiments, a method for producing one or more polynucleotides of interest comprises: obtaining a plurality of RNAs associated with one or more samples, wherein the samples are obtained from one or more subjects, each RNA is associated with a single sample, and the RNAs associated with each sample are present in a separate reaction volume; adding an adapter molecule to the RNAs associated with each sample, wherein the adapter molecule is generated using an enzymatic reaction and comprises a universal priming sequence, a barcode sequence, and a binding site; and incorporating the barcode sequence into one or more polynucleotides associated with each sample, thereby producing the one or more polynucleotides of interest.
1. A method for producing one or more polynucleotides of interest, the method comprising:
obtaining a plurality of RNAs associated with one or more samples, wherein
the samples are obtained from one or more subjects, and
the RNAs associated with a sample are present in a separate reaction volume;
adding an adapter molecule to the RNAs associated with the sample, wherein the adapter molecule is generated using an enzymatic reaction and comprises a universal priming sequence, a barcode sequence, and a binding site,
wherein the adapter molecule is generated by contacting a template molecule with one or more enzymes and the template molecule is a DNA molecule comprising an RNA polymerase (RNAP) promoter, and the one or more enzymes include an RNA polymerase; and
incorporating the barcode sequence into one or more polynucleotides associated with the sample,
thereby producing the one or more polynucleotides of interest.
2. The method of claim 1 , further comprising generating the adapter molecule using the enzymatic reaction.
3. The method of claim 1 , wherein the RNAP promoter is selected from the group consisting of T7, T3, and SP6.
4. The method of claim 1 , wherein:
the template molecule is bound to a solid support,
the solid support is contacted with an aqueous solution, and
the adapter molecule is released into the aqueous solution as it is generated.
5. The method of claim 4 , wherein:
the template molecule comprises an endonuclease restriction site,
the one or more enzymes comprise a restriction endonuclease, and
the adapter molecule comprises a portion of the template molecule, said portion being generated and released into the aqueous solution upon contacting the template molecule with the restriction endonuclease.
6. The method of claim 1 , wherein the adapter molecule is generated in a compartment, and adding the adapter molecule to the RNAs associated with one sample comprises combining the compartment with the reaction volume in which the RNAs are present.
7. The method of claim 1 , wherein the adapter molecule further comprises a unique molecular identifier (UMI) sequence.
8. The method of claim 1 , wherein the adapter molecule is an RNA molecule.
9. The method of claim 1 , further comprising reverse-transcribing the RNAs associated with the sample to obtain a plurality of cDNAs, wherein reverse-transcribing an RNA comprises synthesizing a first strand of cDNA using a reverse-transcriptase and a first-strand primer.
10. The method of claim 9 , wherein:
the reverse transcriptase has template switching activity,
at least some first strands of cDNA associated with the sample comprise a 3′ overhang,
the binding site of the adapter molecule comprises a 3′ portion complementary to the 3′ overhang, and
the adapter molecule serves as a template for the reverse transcriptase, such that the barcode sequence is incorporated into first strands of cDNAs associated with the sample.
11. The method of claim 10 , wherein the 3′ overhang comprises one or more C nucleotides and the 3′ portion of the binding site comprises one or more G nucleotides.
12. The method of claim 9 , wherein producing polynucleotides of interest comprises amplifying the first strands of cDNA for the sample using a first primer and a second primer, the second primer having the same sequence as at least a portion of the first-strand primer, wherein the first primer or the second primer is the adapter molecule.
13. The method of claim 1 , wherein the sample comprises a cell.
14. The method of claim 13 , wherein the cell is a blood cell, an immune cell, a tissue cell, or a tumor cell.
15. The method of claim 14 , wherein the cell is a B cell or a T cell.
16. An adapter construct comprising an RNAP promoter sequence, a universal priming sequence, a barcode sequence, and a binding site.
17. The adapter construct of claim 16 , further comprising a unique molecular identifier (UMI) sequence.
18. A solid support comprising the adapter construct of claim 16 .
19. The solid support of claim 18 , wherein the adapter construct is bound to the solid support via a covalent bond.
20. The solid support of claim 18 , wherein multiple copies of the adapter construct are bound to the solid support.
21. The solid support of claim 20 , wherein at least 10, 30, 100, 300, 1,000, 3,000, 10,000, 30,000, 100,000, 300,000, or 1,000,000 copies of the adapter construct are bound to the solid support.
22. The solid support of claim 20 , wherein each copy of the adapter construct comprises the same barcode sequence.
23. An adapter template library comprising a plurality of the solid supports of claim 18 .
24. The adapter template library of claim 23 , wherein the plurality comprises at least 10, 30, 100, 300, 1,000, 3,000, 10,000, 30,000, 100,000, 300,000, or 1,000,000 solid supports.