Single nucleotide detection method
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United States of America Patent
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Jan 2, 2018
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Jul 22, 2015
filing date -
Jul 22, 2014
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Abstract
A method of sequencing a nucleic acid involves (1) generating single nucleoside triphosphates by progressive pyrophosphorolysis of the nucleic acid; (2) producing a substantially double-stranded oligonucleotide used probe by reacting one of the single nucleoside triphosphates with a corresponding probe system comprising (a) a first single-stranded oligonucleotide labelled with characteristic detectable elements in an undetectable state and (b) second and third single-stranded oligonucleotides capable of hybridising to complementary regions on the first oligonucleotide; (3) digesting the used probe with an enzyme having double-stranded exonucleolytic activity to yield the detectable elements in a detectable state and a single-stranded fourth oligonucleotide which is at least in part the complement of the first oligonucleotide; (4) reacting the fourth oligonucleotide with another first oligonucleotide to produce a substantially double-stranded oligonucleotide product corresponding to the used probe; (5) repeating (3) and (4) in a cycle and (6) detecting the detectable elements released in each iteration.
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