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High-resolution DNA melting analysis for simultaneous mutation scanning and genotyping in solution


High-resolution DNA melting analysis for simultaneous mutation scanning and genotyping in solution



Clinical Chemistry 51(10): 1770-1777



ISSN/ISBN: 0009-9147

PMID: 16189378

DOI: 10.1373/clinchem.2005.054924

High-resolution DNA melting analysis with saturation dyes for either mutation scanning of PCR products or genotyping with unlabeled probes has been reported. However, simultaneous PCR product scanning and probe genotyping in the same reaction has not been described. Asymmetric PCR was performed in the presence of unlabeled oligonucleotide probes and a saturating fluorescent DNA dye. High-resolution melting curves for samples in either capillaries (0.3 degrees C/s) or microtiter format (0.1 degrees C/s) were generated in the same containers used for amplification. Melting curves of the factor V Leiden single-nucleotide polymorphism (SNP) and several mutations in exons 10 and 11 of the cystic fibrosis transconductance regulator gene were analyzed for both PCR product and probe melting transitions. Independent verification of genotype for simple SNPs was achieved by either PCR product or probe melting transitions. Two unlabeled probes in one reaction could genotype many sequence variants with simultaneous scanning of the entire PCR product. For example, analysis of both product and probe melting transitions genotyped DeltaF508, DeltaI507, Q493X, I506V, and F508C variants in exon 10 and G551D, G542X, and R553X variants in exon 11. Unbiased hierarchal clustering of the melting transitions identified the specific sequence variants. When DNA melting is performed rapidly and observed at high resolution with saturating DNA dyes, it is possible to scan for mutations and genotype at the same time within a few minutes after amplification. The method is no more complex than PCR and may reduce the need for resequencing.

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Accession: 012150567

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