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Simultaneous mutation scanning and genotyping by high-resolution DNA melting analysis

Simultaneous mutation scanning and genotyping by high-resolution DNA melting analysis

Nature Protocols 2(1): 59-66

ISSN/ISBN: 1750-2799

PMID: 17401339

DOI: 10.1038/nprot.2007.10

This protocol permits the simultaneous mutation scanning and genotyping of PCR products by high-resolution DNA melting analysis. This is achieved using asymmetric PCR performed in the presence of a saturating fluorescent DNA dye and unlabeled oligonucleotide probes. Fluorescent melting curves of both PCR amplicons and amplicon-probe duplexes are analyzed. The shape of the PCR amplicon melting transition reveals the presence of heterozygotes, whereas specific genotyping is enabled by melting of the unlabeled probe-amplicon duplex. Unbiased hierarchal clustering of melting transitions automatically groups different sequence variants; this allows common variants to be easily recognized and genotyped. This technique may be used in both laboratory research and clinical settings to study single-nucleotide polymorphisms and small insertions and deletions, and to diagnose associated genetic disorders. High-resolution melting analysis accomplishes simultaneous gene scanning and mutation genotyping in a fraction of the time required when using traditional methods, while maintaining a closed-tube environment. The PCR requires <30 min (capillaries) or 1.5 h (96- or 384-well plates) and melting acquisition takes 1-2 min per capillary or 5 min per plate.

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Accession: 072538714

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