Nucleic acid sequencing using charge-switch nucleotides
First Claim
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1. A method for separating an intact NP probe from a phosphate detectable moiety, said method comprising:
- a) providing a sample comprising an intact NP probe with a detectable moiety attached thereto, whereupon an enzymatic cleavage of said intact NP probe to incorporate said NP probe on a primer strand hybridized to a target nucleic acid, a phosphate detectable moiety is produced, wherein said phosphate detectable moiety carries a molecular charge which is different than the molecular charge of said intact NP probe, wherein said intact NP probe is a charge-switch nucleotide phosphate probe having a detectable moiety on a terminal phosphate; and
b) applying an energy field to said sample, thereby separating said phosphate detectable moiety from said sample having an intact NP probe.
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Abstract
The present invention provides compounds, methods and systems for sequencing nucleic acid using single molecule detection. Using labeled NPs that exhibit charge-switching behavior, single-molecule DNA sequencing in a microchannel sorting system is realized. In operation, sequencing products are detected enabling real-time sequencing as successive detectable moieties flow through a detection channel. By electrically sorting charged molecules, the cleaved product molecules are detected in isolation without interference from unincorporated NPs and without illuminating the polymerase-DNA complex.
184 Citations
32 Claims
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1. A method for separating an intact NP probe from a phosphate detectable moiety, said method comprising:
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a) providing a sample comprising an intact NP probe with a detectable moiety attached thereto, whereupon an enzymatic cleavage of said intact NP probe to incorporate said NP probe on a primer strand hybridized to a target nucleic acid, a phosphate detectable moiety is produced, wherein said phosphate detectable moiety carries a molecular charge which is different than the molecular charge of said intact NP probe, wherein said intact NP probe is a charge-switch nucleotide phosphate probe having a detectable moiety on a terminal phosphate; and
b) applying an energy field to said sample, thereby separating said phosphate detectable moiety from said sample having an intact NP probe. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for identifying an intact charge-switch nucleotide phosphate (NP) probe, said method comprising:
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a) contacting a sample comprising said intact charge-switch NP probe having a charged moiety on the base, with an enzyme to produce a phosphate detectable moiety; and
b) applying an electric field to said sample, wherein said phosphate detectable moiety migrates to an electrode differently than said intact charge-switch NP probe. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A method for sequencing a nucleic acid, said method comprising:
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providing a target nucleic acid, a polymerase priming moiety, a polymerase, and a plurality of intact NP probes;
mixing said target nucleic acid, said polymerase priming moiety, said polymerase and said plurality of NP probes under conditions permitting target dependent polymerization of said plurality of NP probes, such conditions which are capable of providing a time sequence of a plurality of phosphate detectable moieties, wherein said phosphate detectable moieties are used in a sequencing method consisting of one-color sequencing, two-color sequencing, three-color sequencing, four-color sequencing and combinations thereof; and
detecting over time said plurality of phosphate detectable moieties to provide a sequence of said target nucleic acid. - View Dependent Claims (28, 29, 30, 31, 32)
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Specification