Linked paired strand sequencing
Provided herein are methods for sequencing both strands of a double stranded nucleic acid fragment that improves fidelity and accuracy of a sequence determination compared to traditional next generation sequencing methods. Compositions and kits for use in the methods are also provided.
1. A method of forming a template polynucleotide on a substrate, said method comprising:
a) ligating a first end of a double-stranded nucleic acid to a first hairpin adapter comprising a first primer binding sequence, wherein said first adapter is attached to said substrate;
b) ligating a second adapter to a second end of the double-stranded nucleic acid, wherein the second adapter comprises a second primer binding sequence and a third primer binding sequence, thereby forming said template polynucleotide on said substrate;
wherein the first primer binding sequence, the second primer binding sequence, and the third primer binding sequence are different.
2. The method of claim 1 , prior to step a), hybridizing said hairpin adapter to an immobilized oligonucleotide attached to said substrate.
3. The method of claim 1 , wherein the second adapter comprises a Y-adapter.
4. The method of claim 3 , wherein the Y-adapter comprises (i) a first strand having a 5′-portion and a 3′-portion, and (ii) a second strand having a 5′-portion and a 3′-portion, wherein the 3′-portion of the first strand is substantially complementary to the 5′-portion of the second strand, and the 5′-portion of the first strand is not substantially complementary to the 3′-portion of the second strand.
5. The method of claim 1 , wherein the hairpin adapter comprises a nucleic acid having a 5′-end, a 5′-portion, a loop, a 3′-portion and a 3′-end, and the 5′-portion of the hairpin adapter is substantially complementary to the 3′-portion of the hairpin adapter, and wherein said loop comprises a primer binding sequence.
6. The method of claim 5 , wherein the loop of the hairpin adapter comprises the first primer binding sequence.
7. The method of claim 1 , wherein the double-stranded nucleic acid is a cell-free DNA (cfDNA) or circulating tumor DNA (ctDNA).
8. The method of claim 1 , wherein the double-stranded nucleic acid is about 50 to 300 nucleotides in length.
9. The method of claim 1 , wherein the hairpin adapter is attached to the substrate via a linker.
10. The method of claim 1 , wherein the substrate is a chip, a wafer, a bead, slide, or a flow cell.
11. The method of claim 1 , wherein the substrate is a polymer coated surface of a flow cell.
12. The method of claim 1 , further comprising annealing an amplification primer to the second adapter, contacting the annealed amplification primer with a polymerase, and extending the annealed amplification primer, thereby generating an amplification product.
13. The method of claim 1 , wherein ligating a first end of a double-stranded nucleic acid to a first adapter and ligating a second adapter to a second end of the double-stranded nucleic acid comprises a T4 DNA ligase.
14. The method of claim 1 , wherein the template polynucleotide further comprises a sample barcode sequence, a molecular identifier sequence, or both a sample barcode sequence and a molecular identifier sequence.
15. The method of claim 1 , wherein the substrate further comprises a patterned surface comprising immobilized primers.
16. The method of claim 1 , wherein the double-stranded nucleic acid further comprises single-nucleotide variants or methylated nucleobases, or both single-nucleotide variants and methylated nucleobases.
17. The method of claim 1 , wherein ligating a first end of a double-stranded nucleic acid to a first adapter and ligating a second end of a double-stranded nucleic acid to a second adapter comprises ligating both 3′ end and 5′ end of the duplex region of the first and second adapters to the double stranded nucleic acid.
18. The method of claim 1 , wherein the hairpin adapter comprises a double stranded region comprising at least 10 nucleotides and a loop region comprising a barcode and a sequence complementary to a surface primer hybridized to a solid support.
19. The method of claim 3 , wherein the Y-adapter comprises a double stranded region comprising 10-20 nucleotides and an unmatched region comprising 25-35 nucleotides.
20. A method of forming a template polynucleotide on a substrate, said method comprising:
a) ligating a first end of a double-stranded nucleic acid to a first adapter, wherein said first adapter is attached to said substrate, and wherein said first adapter is a Y-adapter comprising a first primer binding sequence and a second primer binding sequence;
b) ligating a second adapter to a second end of the double-stranded nucleic acid, wherein the second adapter is a hairpin adapter and comprises a third primer binding sequence, thereby forming said template polynucleotide on said substrate;
wherein the first primer binding sequence, the second primer binding sequence, and the third primer binding sequence are different.