Selective modification of polymer subunits to improve nanopore-based analysis
First Claim
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1. A method for analyzing a polymer analyte, comprising:
- (a) selectively modifying a target polymer subunit of a kind in a pre-analyte polymer to produce a polymer analyte with an abasic site, wherein selectively modifying the target polymer subunit of a kind comprises contacting the target polymer subunit of a kind with an agent to produce a modified subunit and converting the modified subunit to an abasic site;
(b) translocating the polymer analyte comprising the abasic site from a first conductive liquid medium to a second conductive liquid medium through a nanopore, wherein the nanopore provides liquid communication between the first conductive liquid medium and the second conductive liquid medium;
(c) measuring an ion current between the first conductive liquid medium and the second conductive liquid medium as the polymer analyte passes through the nanopore; and
(d) detecting the abasic site based on the measured ion current.
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Abstract
The present disclosure provides method and systems for improving nanopore-based analysis of polymers. The disclosure provides methods for selectively modifying one or more monomeric subunit(s) of a kind a pre-analyte polymer that results polymer analyte with a modified subunit. The polymer analyte produces a detectable signal in a nanopore-based system. The detectable signal, and/or its deviation from a reference signal, indicates the location of the modified subunit in the polymer analyte and, thus, permits the identification of the subunit at that location in the original pre-analyte polymer.
14 Citations
18 Claims
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1. A method for analyzing a polymer analyte, comprising:
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(a) selectively modifying a target polymer subunit of a kind in a pre-analyte polymer to produce a polymer analyte with an abasic site, wherein selectively modifying the target polymer subunit of a kind comprises contacting the target polymer subunit of a kind with an agent to produce a modified subunit and converting the modified subunit to an abasic site; (b) translocating the polymer analyte comprising the abasic site from a first conductive liquid medium to a second conductive liquid medium through a nanopore, wherein the nanopore provides liquid communication between the first conductive liquid medium and the second conductive liquid medium; (c) measuring an ion current between the first conductive liquid medium and the second conductive liquid medium as the polymer analyte passes through the nanopore; and (d) detecting the abasic site based on the measured ion current. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for analyzing a nucleic acid analyte, comprising:
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(a) incorporating a modified nucleobase into the nucleic acid analyte; (b) contacting the nucleic acid analyte with an error correction enzyme capable of removing the modified nucleobase to provide an abasic site in the nucleic acid analyte; (c) translocating the nucleic acid analyte from a first conductive liquid medium to a second conductive liquid medium through a nanopore, wherein the nanopore provides liquid communication between the first conductive liquid medium and the second conductive liquid medium; (d) measuring an ion current between the first conductive liquid medium and the second conductive liquid medium as the nucleic acid analyte passes through the nanopore; and (e) detecting the abasic site based on the measured ion current.
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Specification