Nanopore-based single DNA molecule characterization, identification and isolation using speed bumps
First Claim
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1. A method of detecting one or more identifiers in a single-stranded (ss) test DNA molecule, the method comprising:
- (B1) forming a first bulky structure (BS1) on a first end of the ss test DNA molecule, (C1) contacting a pool of speed bumps with the ss test DNA molecule, wherein the speed bumps bind specifically to the one or more identifiers, to form a speed bump-test DNA molecule complex having at least one speed bump-identifier duplex segment,(C2) applying an electric potential to flow the speed bump-test DNA molecule complex through a nanopore, wherein the nanopore comprises a constriction area, and wherein the speed bump-test DNA complex is flowed through the nanopore until a first speed bump-identifier duplex segment is stalled before the constriction area,(C3) obtaining a first set of electrical signals when the first speed bump-identifier duplex segment is stalled inside the nanopore for a dwelling time, wherein the first set of electrical signals are characterized to detect the presence of a first identifier,(C4) dissociating the first speed bump-identifier duplex segment and continuing the flow of the molecule through the nanopore, and(C5) repeating steps (C1)-(C4) until the ss test DNA molecule is stopped by BS1,wherein the one or more identifiers are selected from the group consisting of a direction identifier, a reference signal identifier, a sample source identifier, and a sample identifier.
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Abstract
The present invention relates to a method of using nanopores to obtain sequence information of sample DNAs in ss test DNAs. The method comprises using speed bumps to stall the ss test DNAs in the nanopores at random positions of the ss test DNAs to obtain sequence information of each and every nucleotides of the sample DNAs, and to construct the whole sequences of the sample DNAs. The present invention also relates to identification and/or isolation of test DNAs having desired sequence(s) using nanopore detectors facilitated by speed bump.
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18 Claims
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1. A method of detecting one or more identifiers in a single-stranded (ss) test DNA molecule, the method comprising:
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(B1) forming a first bulky structure (BS1) on a first end of the ss test DNA molecule, (C1) contacting a pool of speed bumps with the ss test DNA molecule, wherein the speed bumps bind specifically to the one or more identifiers, to form a speed bump-test DNA molecule complex having at least one speed bump-identifier duplex segment, (C2) applying an electric potential to flow the speed bump-test DNA molecule complex through a nanopore, wherein the nanopore comprises a constriction area, and wherein the speed bump-test DNA complex is flowed through the nanopore until a first speed bump-identifier duplex segment is stalled before the constriction area, (C3) obtaining a first set of electrical signals when the first speed bump-identifier duplex segment is stalled inside the nanopore for a dwelling time, wherein the first set of electrical signals are characterized to detect the presence of a first identifier, (C4) dissociating the first speed bump-identifier duplex segment and continuing the flow of the molecule through the nanopore, and (C5) repeating steps (C1)-(C4) until the ss test DNA molecule is stopped by BS1, wherein the one or more identifiers are selected from the group consisting of a direction identifier, a reference signal identifier, a sample source identifier, and a sample identifier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification