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Mutation detection with MutH, MutL, and MutS mismatch repair proteins



Mutation detection with MutH, MutL, and MutS mismatch repair proteins



Proceedings Of The National Academy Of Sciences Of The United States Of America. 93(9): 4374-4379



Escherichia coli methyl-directed mismatch repair is initiated by MutS-, MutL-, and ATP-dependent activation of MutH endonuclease, which cleaves at d(GATC) sites in the vicinity of a mismatch. This reaction provides an efficient method for detection of mismatches in heteroduplexes produced by hybridization of genetically distinct sequences after PCR amplification. Multiple examples of transition and transversion mutations, as well as one, two, and three nucleotide insertion/deletion mutants, have been detected in PCR heteroduplexes ranging in size from 400 bp to 2.5 kb. Background cleavage of homoduplexes is largely due to polymerase errors that occur during amplification, and the MutHLS reaction provides an estimate of the incidence of mutant sequences that arise during PCR.

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Accession: 009066787

Download citation: RISBibTeXText

PMID: 8633074

DOI: 10.2307/39253


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