Methods of screening nucleic acids for single nucleotide...

Details Methods of screening nucleic acids for single nucleotide... Methods of screening nucleic acids for single nucleotide...

2011-03-15

2011-03-15

Whisenant, Ethan (Department: 1634)

Chemistry: molecular biology and microbiology

Measuring or testing process involving enzymes or...

Involving nucleic acid

C536S023100, C536S024300

Reexamination Certificate

active

07906287

ABSTRACT:
Disclosed are methods and compositions for detecting variation in nucleic acids. The disclosed method compares the sequence of a nucleic acid of interest with the sequence of a reference nucleic acid to sensitively identify variations between the sequence of a nucleic acid of interest and the sequence of a reference nucleic acid. The disclosed method generally involves excision and replacement of selected nucleotides in nucleic acid strands hybridized to other strands. In the method, if the excised nucleotide was mismatched with the nucleotide in the other, hybridized strand, then the replacement nucleotide will not be mismatched. If the excised nucleotide was not mismatched with the nucleotide in the other, hybridized strand, then the excised nucleotide is not replaced. This difference allows detection of variation in the nucleic acid of interest. In some forms of the method, by replacing excised nucleotides with nuclease-resistant nucleotides, strands in which excised nucleotides are replaced will be resistant to nuclease digestion while strands in which excised nucleotides are not replaced will be sensitive to nuclease digestion. By exposing the hybridizing nucleic acids to nuclease following replacement of excised nucleotides, the strands in which excised nucleotides are not replaced can be destroyed by the nuclease while strands in which excised nucleotides are replaced can be preserved. The remaining strands can then be detected and whether the strand survived nuclease digestion can be noted. Strands that survive nuclease digestion are indicative of the presence of variation in the nucleic acid of interest.

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