Roles of base excision repair subpathways in correcting oxidized abasic sites in DNA

The FEBS Journal
Jung-Suk Sung, Bruce Demple

Abstract

Base excision DNA repair (BER) is fundamentally important in handling diverse lesions produced as a result of the intrinsic instability of DNA or by various endogenous and exogenous reactive species. Defects in the BER process have been associated with cancer susceptibility and neurodegenerative disorders. BER funnels diverse base lesions into a common intermediate, apurinic/apyrimidinic (AP) sites. The repair of AP sites is initiated by the major human AP endonuclease, Ape1, or by AP lyase activities associated with some DNA glycosylases. Subsequent steps follow either of two distinct BER subpathways distinguished by repair DNA synthesis of either a single nucleotide (short-patch BER) or multiple nucleotides (long-patch BER). As the major repair mode for regular AP sites, the short-patch BER pathway removes the incised AP lesion, a 5'-deoxyribose-5-phosphate moiety, and replaces a single nucleotide using DNA polymerase (Polbeta). However, short-patch BER may have difficulty handling some types of lesions, as shown for the C1'-oxidized abasic residue, 2-deoxyribonolactone (dL). Recent work indicates that dL is processed efficiently by Ape1, but that short-patch BER is derailed by the formation of stable covalent crosslinks betw...Continue Reading

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