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A novel blocker-PCR method for detection of rare mutant alleles in the presence of an excess amount of normal DNA.

Identifieur interne : 002958 ( PubMed/Corpus ); précédent : 002957; suivant : 002959

A novel blocker-PCR method for detection of rare mutant alleles in the presence of an excess amount of normal DNA.

Auteurs : T. Seyama ; T. Ito ; T. Hayashi ; T. Mizuno ; N. Nakamura ; M. Akiyama

Source :

RBID : pubmed:1598207

English descriptors

Abstract

A novel polymerase chain reaction method was developed to preferentially amplify a segment of DNA containing a base substitution mutation. This technique uses a pair of dideoxynucleotide-labeled oligonucleotides (18 mers) of normal sequences as blockers located between the two primers. By virtue of a subtle difference in the melting temperature between the blocker-normal DNA and blocker-mutant DNA hybrids, the method allows preferential amplification of the mutant DNA. We used the human N-ras gene as a model. Two different types of N-ras mutations could be effectively amplified when they were present with an excess amount of normal DNA at a ratio of 1:10(3). Furthermore, the sensitivity was increased 10-fold by using single strand conformation polymorphism analysis for the amplified products, and mutant DNA was detected in the presence of a 10(4) times excess amount of normal DNA.

DOI: 10.1093/nar/20.10.2493
PubMed: 1598207

Links to Exploration step

pubmed:1598207

Le document en format XML

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<name sortKey="Mizuno, T" sort="Mizuno, T" uniqKey="Mizuno T" first="T" last="Mizuno">T. Mizuno</name>
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