Abstract
In recent years, progress toward understanding the mechanisms and molecules with which mammalian cells respond to DNA double-strand breaks (DSBs) has been dramatic. This is attributable in part to the analysis of DSB repair-deficient rodent cell lines, which led to the isolation and characterization of the DNA-PK complex, XRCC4, DNA ligase IV, and others (3,43,49,59,60,79,83,100,103,112). The gene products thus identified have provided many important insights regarding the functions that maintain genomic integrity in the face of genotoxic stress. These studies have also shed light on DNA recombination pathways that diversify genetic information in the establishment of the immune repertoire. Nonetheless, the bulk of our current understanding of DNA recombination pathways has come from genetic and biochemical studies in Saccharomyces cerevisiae and bacterial systems. As an alternative to phenotype-driven analysis, a number of investigators have pursued the identification of mammalian counterparts to bacterial and S. cerevisiae recombinational DNA repair proteins to examine the cellular DNA damage response in mammals (46,80). The potential of this comparative approach has been most impressively realized in the functional analysis of the yeast and mammalian Rad51 proteins, which are homologs of the bacterial RecA protein (9,38,96). More recently, the MRE11-RAD50 protein complex, with homologs in bacteria, S. cerevisiae, and mammals, has emerged as a central player in the DNA transactions that preserve genomic integrity in yeast and mammalian cells.
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Petrini, J.H.J., Maser, R.S., Bressan, D.A. (2001). The MRE11-RAD50 Complex. In: Nickoloff, J.A., Hoekstra, M.F. (eds) DNA Damage and Repair. Contemporary Cancer Research. Humana Press, Totowa, NJ. https://doi.org/10.1007/978-1-59259-095-7_7
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