PMID: 16637261Apr 28, 2006Paper

Mismatch repair

Molekuliarnaia biologiia
N V Goliasnaia, N A Tsvetkova

Abstract

Specific repair systems are activated in response to the DNA damage. Mismatch repair protects the genome of prokaryotic and eukaryotic cells from lesions that appear during process of DNA replication or are induced by mutagenic factors. The methyl directed mismatch repair distinguishes the new strand from the old strand by the hemi-methylated state of the DNA and controls the fidelity of genetic information after homologous recombination. The very short patch repair restores the mismatches at the sites with nucleotide sequence CC(W/T)GG. The "8-oxoG" pathway is independent of the hemi-methylated state of the DNA, and removes the oxidated nucleotides from the genome of prokaryotes and eukaryotes. Mutations in genes of mismatch repair enhance the process of mutagenesis in prokaryotic cell, and are the reason for the development of the colon cancer in humans. The mechanisms of mismatch repair and the role of defective repair proteins in mutagenesis and carcinogenesis are discussed in this review.

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