Dec 6, 2002

A novel method for SNP detection using a new duplex-specific nuclease from crab hepatopancreas

Genome Research
Dmitry A ShaginSergey A Lukyanov

Abstract

We have characterized a novel nuclease from the Kamchatka crab, designated duplex-specific nuclease (DSN). DSN displays a strong preference for cleaving double-stranded DNA and DNA in DNA-RNA hybrid duplexes, compared to single-stranded DNA. Moreover, the cleavage rate of short, perfectly matched DNA duplexes by this enzyme is essentially higher than that for nonperfectly matched duplexes of the same length. Thus, DSN differentiates between one-nucleotide variations in DNA. We developed a novel assay for single nucleotide polymorphism (SNP) detection based on this unique property, termed "duplex-specific nuclease preference" (DSNP). In this innovative assay, the DNA region containing the SNP site is amplified and the PCR product mixed with signal probes (FRET-labeled short sequence-specific oligonucleotides) and DSN. During incubation, only perfectly matched duplexes between the DNA template and signal probe are cleaved by DSN to generate sequence-specific fluorescence. The use of FRET-labeled signal probes coupled with the specificity of DSN presents a simple and efficient method for detecting SNPs. We have employed the DSNP assay for the typing of SNPs in methyltetrahydrofolate reductase, prothrombin and p53 genes on homozygo...Continue Reading

Mentioned in this Paper

TP53 gene
Crabs
Clotting Factor II Assay
Hepatopancreas
Endonuclease
Cancer Genus
Phobia, Specific
F2 gene
Cytokinesis of the Fertilized Ovum
Cleaved Cell

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