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. 1992 Feb 1;89(3):890–894. doi: 10.1073/pnas.89.3.890

Genotypic analysis of mutations in Taq I restriction recognition sites by restriction fragment length polymorphism/polymerase chain reaction.

M S Sandy 1, S M Chiocca 1, P A Cerutti 1
PMCID: PMC48350  PMID: 1736304

Abstract

Point mutations in somatic cells play a role in the etiology of several classes of human pathologies. Experimental procedures are required that allow the detection and quantitation of such mutations in disease-related genes in tissue biopsy samples without the need for the selection of mutated cells. We describe the genotypic analysis of single base pair mutations in the Taq I endonuclease recognition sequence TCGA, residues 2508-2511 of exon 2 of the human c-H-ras1 gene, by the restriction fragment length polymorphism/polymerase chain reaction (RFLP/PCR) approach. The high thermostability of Taq I endonuclease allows the continuous removal of eventual residual wild-type sequences during the thermocycling of the PCR and reduces polymerase errors in the final RFLP/PCR product to a minimum. As few as five copies of a mutant standard containing two base pair changes in the chosen Taq I site could be rescued from 10(8) copies of wild-type DNA. Taq I RFLP/PCR holds promise for the monitoring of mutations in biochemical epidemiology.

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Selected References

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