Sequencing using concatemers of copies of sense and antisense strands
First Claim
1. A method of obtaining nucleotide sequence information from nucleic acid segments of a nucleic acid sample, the method comprising:
- a) fragmenting a nucleic acid sample, thereby providing at least one double-stranded nucleic acid fragment comprising a double-stranded region comprising a sense strand and a complementary antisense strand of said sense strand;
b) ligating a first hairpin adapter to a first end of said double-stranded nucleic acid fragment and ligating a second hairpin adapter to a second end of double-stranded said nucleic acid fragment, thereby providing a circular nucleic acid;
c) performing a rolling circle replication reaction with said circular nucleic acid as a template, thereby producing a concatemer having segments comprising repeating copies of said sense strand and said antisense strand;
d) performing a single-molecule sequencing process, thereby generating a single sequencing read from said concatemer, said single sequencing read comprising at least one first sequence corresponding to said sense strand and at least one second sequence corresponding to said antisense strand; and
e) comparing or assembling said at least one first sequence and said at least one second sequence from said single sequencing read, thereby obtaining the nucleotide sequence information of said nucleic acid segments of the nucleic acid sample.
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Abstract
Methods and systems for single molecule sequencing using concatemers of copies of sense and antisense strands. Concatemers are provided, for example, by carrying out rolling circle amplification on a circular molecule having sense and antisense regions to produce repeated copies of the sense and antisense regions connected by linking regions. The circular molecules can be produced by ligating hairpin adapters to each end of a double-stranded nucleic acid having a sense and antisense strand. The ligations can be carried out, for example using blunt end ligation. In some cases, a single molecule consensus sequence for a single template molecule is obtained. A single read from each template molecule can be obtained by comparing the sequence information of the sense and antisense regions.
126 Citations
21 Claims
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1. A method of obtaining nucleotide sequence information from nucleic acid segments of a nucleic acid sample, the method comprising:
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a) fragmenting a nucleic acid sample, thereby providing at least one double-stranded nucleic acid fragment comprising a double-stranded region comprising a sense strand and a complementary antisense strand of said sense strand; b) ligating a first hairpin adapter to a first end of said double-stranded nucleic acid fragment and ligating a second hairpin adapter to a second end of double-stranded said nucleic acid fragment, thereby providing a circular nucleic acid; c) performing a rolling circle replication reaction with said circular nucleic acid as a template, thereby producing a concatemer having segments comprising repeating copies of said sense strand and said antisense strand; d) performing a single-molecule sequencing process, thereby generating a single sequencing read from said concatemer, said single sequencing read comprising at least one first sequence corresponding to said sense strand and at least one second sequence corresponding to said antisense strand; and e) comparing or assembling said at least one first sequence and said at least one second sequence from said single sequencing read, thereby obtaining the nucleotide sequence information of said nucleic acid segments of the nucleic acid sample. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of obtaining nucleotide sequence information from segments of a single template molecule, the method comprising:
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performing a single-molecule sequencing process on a single template molecule, wherein the single template molecule comprises a linear concatemer nucleic acid strand comprising segments comprising repeating, alternating copies of a sense region and a complementary antisense region of said sense region, first linking regions, and second linking regions, and wherein one of said first linking regions are present between 3′
end of one of the sense regions and 5′
end of one of the antisense regions, and wherein one of said second linking regions are present between 3′
end of one of the antisense regions and 5′
end of one of the sense regions,thereby generating a sequence read from the single template molecule, the read comprising at least one first sequence corresponding to the sense region, and at least one second sequence corresponding to the complementary antisense region; and comparing or assembling the at least one first sequence and the at least one second sequence from the sequence read, thereby obtaining nucleotide sequence information of the segments of the single template molecule. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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Specification