IP Library › Granted Patent US 12,509,721
Granted Patent B2
US 12,509,721 · App. 17/817,065 · Granted Dec 30, 2025

Methods and systems for characterizing analytes using nanopores

Inventors: James Anthony Clarke (Oxford, GB); James White (Oxford, GB); Richard Muscat (Oxford, GB); Jessica Mary May Knott (Oxford, GB); Ramiz Iqbal Nathani (Oxford, GB); Andrew John Heron (Oxford, GB); Mark John Bruce (Oxford, GB); Lakmal Jayasinghe (Oxford, GB); Domenico Caprotti (Oxford, GB); David Jackson Stoddart (Oxford, GB); Rebecca Victoria Bowen (Oxford, GB); Christopher James Wright (Oxford, GB); Paul Richard Moody (Oxford, GB)
Assignee: Oxford Nanopore Technologies PLC
C12Q1/6869G01N33/48721
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Quick Facts
Patent No.
US 12,509,721
App. No.
17/817,065
Granted
Dec 30, 2025
Kind
B2
Abstract

Methods of characterizing an analyte using a nanopore. One aspect features methods for characterizing a double-stranded polynucleotide using a nanopore, e.g., without using a hairpin connecting a template and a complement of the double-stranded polynucleotide. Another aspect features methods for characterizing an analyte using a tag-modified nanopore with increased sensitivity and/or higher throughput. Compositions and systems including, e.g., adaptors for attachment to double-stranded polynucleotides and tag-modified nanopores, which can be used in the methods are also provided.

Claims (20)

1 . A method for determining a characteristic of a polynucleotide analyte using a nanopore, the method comprising: (i) obtaining measurements of a first polynucleotide analyte while moving the first polynucleotide analyte with respect to the nanopore and causing a second polynucleotide analyte to bind to a binding site of an uncharged tag conjugated to the nanopore during movement of the first polynucleotide analyte with respect to the nanopore, wherein the binding site of the uncharged tag is external to the lumen of the nanopore; (ii) obtaining measurements of the second polynucleotide analyte that has bound to the binding site of the uncharged tag while moving the second polynucleotide analyte with respect to the nanopore, wherein the second polynucleotide analyte is released from the binding site of the uncharged tag during movement of the second polynucleotide analyte with respect to the nanopore and wherein the measurements are indicative of one or more characteristics of the second polynucleotide analyte; and (iii) characterizing the second polynucleotide analyte based on the measurements obtained in step (ii).

2 . The method of claim 1 , wherein: (a) the first polynucleotide analyte comprises a double-stranded nucleic acid; (b) the second polynucleotide analyte comprises a double-stranded nucleic acid; or (c) the first polynucleotide analyte and second polynucleotide analyte each comprise a double stranded nucleic acid, wherein the first polynucleotide analyte and the second polynucleotide analyte are not complementary nucleic acids.

3 . The method of claim 1 , wherein: (a) moving the first polynucleotide analyte with respect to the nanopore in step (i) comprises contacting the first polynucleotide analyte with a helicase; (b) moving the second polynucleotide analyte with respect to the nanopore in step (ii) comprises contacting the second polynucleotide analyte with a helicase; or (c) moving the first polynucleotide analyte with respect to the nanopore in step (i) comprises contacting the first polynucleotide analyte with a helicase and moving the second polynucleotide analyte with respect to the nanopore in step (ii) comprises contacting the second polynucleotide analyte with the helicase.

4 . The method of claim 3 , wherein the helicase is selected from the group consisting of a Hel308 helicase, a RecD helicase, a Tral helicase, a TrwC helicase, a XPD helicase, or a Dda helicase.

5 . The method of claim 3 , wherein the helicase is selected from the group consisting of Hel308 Mbu helicase, Hel308 Csy helicase, Hel308 Tga helicase, Hel308 Mhu helicase, Tral Eco helicase, or XPD Mbu helicase.

6 . The method of claim 1 , wherein the uncharged tag is conjugated to an outer rim of the nanopore external to the lumen of the nanopore.

7 . The method of claim 1 , wherein the first and second polynucleotide analytes are non-covalently bound to one another, and step (i) further comprises contacting the non-covalently bound first and second polynucleotide analytes to the nanopore under conditions that promote translocation of the first polynucleotide analyte through the nanopore, wherein a second binding site on the second polynucleotide analyte is exposed during translocation of the first polynucleotide analyte through the nanopore, and wherein the second binding site reversibly binds to a binding site of an uncharged tag that is present on the nanopore.

8 . The method of claim 7 , wherein the first polynucleotide analyte and second polynucleotide analyte are complementary nucleic acid strands.

9 . The method of claim 7 , wherein the tag on the nanopore is an oligonucleotide, and the second binding site on the second polynucleotide analyte is a portion of a nucleic acid that has a sequence that is complementary to the tag.

10 . The method of claim 7 , wherein the pair of non-covalently bound first and second polynucleotide analytes comprise a target nucleic acid attached to an adaptor, and wherein the second binding site is present on the adaptor.

11 . The method of claim 7 , wherein the non-covalently bound first and second polynucleotide analytes comprise a target nucleic acid attached to an adaptor at each of the two ends of the target nucleic acid, wherein the target nucleic acid comprises a template strand and a complement strand, and wherein each adaptor comprises a duplex stem and a first single strand extending from the duplex stem, wherein the first single strand of one adaptor is contiguous with the template strand and the first single strand of the other adaptor is contiguous with the complement strand.

12 . The method of claim 7 , wherein the non-covalently bound first and second polynucleotide analytes comprise a target nucleic acid attached to an adaptor, wherein the tag is a nucleic acid having sequence complementarity to a portion of the adaptor.

13 . The method of claim 11 , wherein, for each adapter, a polynucleotide unwinding enzyme is bound to the first single strand extending from the duplex stem.

14 . The method of claim 13 , wherein the polynucleotide unwinding enzyme is a helicase.

15 . A method for determining a characteristic of a polynucleotide analyte using a nanopore, the method comprising: (i) obtaining measurements of the first polynucleotide analyte while moving the first polynucleotide analyte with respect to the nanopore and causing the second polynucleotide analyte to bind to a binding site of the nanopore during movement of the first polynucleotide analyte with respect to the nanopore, wherein the binding site is external to the lumen of the nanopore and wherein moving the first polynucleotide analyte with respect to the nanopore in comprises contacting the first polynucleotide analyte with a helicase; (ii) obtaining measurements of the second polynucleotide analyte that has bound to the binding site of the nanopore while moving the second polynucleotide analyte with respect to the nanopore, wherein the second polynucleotide analyte is released from the binding site that is external to the lumen of the nanopore during movement of the second polynucleotide analyte with respect to the nanopore and wherein the measurements are indicative of one or more characteristics of the second polynucleotide analyte; and (iii) characterizing the second polynucleotide analyte based on the measurements obtained in step (ii).

16 . The method of claim 15 , wherein the helicase is an Hel308 helicase, a RecD helicase, a Tral helicase, a TrwC helicase, a XPD helicase, or a Dda helicase.

17 . The method of claim 15 , wherein the helicase is selected from the group consisting of Hel308 Mbu helicase, Hel308 Csy helicase, Hel308 Tga helicase, Hel308 Mhu helicase, Tral Eco helicase, or XPD Mbu helicase.

18 . The method of claim 15 , wherein the binding site is on an uncharged tag conjugated to the nanopore.

19 . The method of claim 15 , wherein the first polynucleotide analyte and second polynucleotide analyte are complementary nucleic acid strands.

20 . The method of claim 15 , wherein the first and second polynucleotide analytes are non-covalently bound to one another, and step (i) further comprises contacting the non-covalently bound first and second polynucleotide analytes to the nanopore under conditions that promote translocation of the first polynucleotide analyte through the nanopore, wherein a second binding site on the second polynucleotide analyte is exposed during translocation of the first polynucleotide analyte through the nanopore, and wherein the second binding site reversibly binds to a binding site of an uncharged tag that is present on the nanopore.

Assignments (2)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Mar 25, 2024
From: CLARKE, JAMES ANTHONY; WHITE, JAMES; MUSCAT, RICHARD; KNOTT, JESSICA MARY MAY; NATHANI, RAMIZ IQBAL; HERON, ANDREW JOHN; BRUCE, MARK JOHN; JAYASINGHE, LAKMAL; CAPROTTI, DOMENICO; STODDART, DAVID JACKSON; BOWEN, REBECCA VICTORIA; WRIGHT, CHRISTOPHER JAMES; MOODY, PAUL RICHARD
To: OXFORD NANOPORE TECHNOLOGIES LIMITED
Reel/Frame 066879/0699 →
CHANGE OF NAME Recorded Mar 25, 2024
From: OXFORD NANOPORE TECHNOLOGIES LIMITED
To: OXFORD NANOPORE TECHNOLOGIES PLC
Reel/Frame 067489/0843 →
Priority Claims (1)
GB 1620450 · Dec 1, 2016 · national
Continuity (3)
Continuation 16465987
Provisional Application 62471338 · Mar 14, 2017
Related Publication 20230084931A1 · Mar 16, 2023
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