Caister Academic Press

DNA Repair: Key to Survival?

Elaine O. Davis and Lorna N. Forse
from: Mycobacterium: Genomics and Molecular Biology (Edited by: Tanya Parish and Amanda Brown). Caister Academic Press, U.K. (2009)

Abstract

Sequence comparisons indicate that mycobacteria possess the majority of the key DNA repair pathways identified in other bacterial species, including base excision repair, nucleotide excision repair, recombination repair and non-homologous end-joining. However, there are some notable differences such as the absence of a mismatch repair system, as well as variations in the components of other repair pathways. Currently functional studies of DNA repair within mycobacterial species are limited, but this is an expanding area of research. It has been demonstrated that DNA-damage induced mutagenesis is mediated by a different class of DNA polymerase to that used in Escherichia coli. Although the classical SOS system of gene regulation in response to DNA damage is conserved and functional in mycobacteria, many of the DNA repair genes whose expression increases following DNA damage are controlled by an alternative system or systems that are yet to be characterised. The increase in expression observed for a number of Mycobacterium tuberculosis DNA repair genes in infection models suggests that DNA repair might be particularly important during pathogenesis read more ...
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