Analysis of enzymatically amplified beta-globin and HLA-DQ alpha DNA with allele-specific oligonucleotide probes - PubMed

• PMID: 3785382
• DOI: 10.1038/324163a0

Analysis of enzymatically amplified beta-globin and HLA-DQ alpha DNA with allele-specific oligonucleotide probes

R K Saiki et al. Nature. 1986 Nov.

Abstract

Allelic sequence variation has been analysed by synthetic oligonucleotide hybridization probes which can detect single base substitutions in human genomic DNA. An allele-specific oligonucleotide (ASO) will only anneal to sequences that match it perfectly, a single mismatch being sufficient to prevent hybridization under appropriate conditions. To improve the sensitivity, specificity and simplicity of this approach, we used the polymerase chain reaction (PCR) procedure to enzymatically amplify a specific segment of the beta-globin or HLA-DQ alpha gene in human genomic DNA before hybridization with ASOs. This in vitro amplification method, which produces a greater than 10(5)-fold increase in the amount of target sequence, permits the analysis of allelic variation with as little as 1 ng of genomic DNA and the use of a simple 'dot blot' for probe hybridization. As a further simplification, PCR amplification has been performed directly on crude cell lysates, eliminating the need for DNA purification.

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