Methods for determining sequence profiles
First Claim
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1. A method of detecting a preselected signature in a nucleic acid, comprising:
- (a) incorporating a subset of nucleic acid base types into a primed nucleic acid to form an extended nucleic acid, wherein the subset of nucleic acid base types is complementary to at least one and no more than three nucleic acid base types in the primed nucleic acid, wherein incorporation of each of the individual nucleic acid base types is not detected among the subset of nucleic acid base types;
(b) contacting the extended nucleic acid with a polymerase and a nucleotide with a preselected base type different from the nucleic acid base types in the subset of step (a);
(c) detecting a ternary complex comprising the extended nucleic acid, the polymerase and the nucleotide with the preselected nucleic acid base type thereby detecting the preselected signature, wherein the nucleotide with the preselected base type is prevented from incorporating into the extended nucleic acid during the detecting;
(d) incorporating, after step (b), the nucleotide with the preselected based type into the extended nucleic acid;
(e) repeating steps (a) and (b) at least one time after step (d); and
(f) determining a number of times the preselected nucleic acid base type is detected to determine a number of times the preselected signature occurs.
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Abstract
Provided herein are methods for analyzing a signature sequence in a nucleic acid sample by rapid sequencing of a target nucleic acid region. The method examines the target nucleic acid directly and minimizes the number of examination steps needed to determine a signature that is characteristic of a genetic feature of the nucleic acid sample.
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Citations
20 Claims
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1. A method of detecting a preselected signature in a nucleic acid, comprising:
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(a) incorporating a subset of nucleic acid base types into a primed nucleic acid to form an extended nucleic acid, wherein the subset of nucleic acid base types is complementary to at least one and no more than three nucleic acid base types in the primed nucleic acid, wherein incorporation of each of the individual nucleic acid base types is not detected among the subset of nucleic acid base types; (b) contacting the extended nucleic acid with a polymerase and a nucleotide with a preselected base type different from the nucleic acid base types in the subset of step (a); (c) detecting a ternary complex comprising the extended nucleic acid, the polymerase and the nucleotide with the preselected nucleic acid base type thereby detecting the preselected signature, wherein the nucleotide with the preselected base type is prevented from incorporating into the extended nucleic acid during the detecting; (d) incorporating, after step (b), the nucleotide with the preselected based type into the extended nucleic acid; (e) repeating steps (a) and (b) at least one time after step (d); and (f) determining a number of times the preselected nucleic acid base type is detected to determine a number of times the preselected signature occurs. - View Dependent Claims (2, 3, 4, 5, 6, 18, 19, 20)
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7. A method of distinguishing target sequences, comprising:
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(a) providing a primed nucleic acid that comprises a primer hybridized to a template strand, wherein the template strand comprises a candidate sequence selected from at least two known target sequences; (b) contacting the primed nucleic acid with a polymerase and a subset of nucleic acid base types, whereby the subset of nucleic acid base types incorporates into the primer to produce an extended primed nucleic acid; (c) contacting the extended primed nucleic acid with a polymerase and a preselected nucleic acid base type different from the subset of nucleic acid base types, whereby a ternary complex forms if the preselected nucleic acid base type is the next correct nucleotide for the extended primed nucleic acid product, and wherein the ternary complex is stabilized to prevent incorporation of the preselected nucleic acid base type into the extended primed nucleic acid; (d) acquiring a signal produced by the ternary complex; and (e) repeating (b) through (d) at least one time to obtain a series of signals, wherein the series of signals comprises a signature that identifies the candidate sequence. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of determining the presence of a repeat unit within a nucleic acid region in a sample, comprising:
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(a) providing a primed nucleic acid that comprises a primer hybridized to a template strand with at least one repeat unit downstream of the primer; (b) contacting the primed nucleic acid with a polymerase and a subset of nucleic acid base types, whereby the subset of nucleic acid base types incorporates into the primer to produce an extended primed nucleic acid; (c) contacting the extended primed nucleic acid with a polymerase and a preselected nucleic acid base type different from the subset of nucleic acid base types, whereby a ternary complex forms if the preselected nucleic acid base type is the next correct nucleotide for the extended primed nucleic acid product, and wherein the ternary complex is stabilized to prevent incorporation of the preselected nucleic acid based type into the extended primed nucleic acid; and (d) detecting the ternary complex while preventing incorporation of the preselected nucleic acid base type into the extended primed nucleic acid, thereby determining the presence of the repeat unit within the nucleic acid region. - View Dependent Claims (17)
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Specification