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Extracts of Drosophila embryos and adults have been found to catalyze highly efficient DNA mismatch repair, as well as repair of 1- and 5-bp loops. For mispairs T.G and G.G, repair is nick dependent and is specific for the nicked strand of heteroduplex DNA. In contrast, repair of A.A, C.A, G.A, C.T, T.T, and C.C is not nick dependent, suggesting the presence of glycosylase activities. For nick-dependent repair, the specific activity of embryo extracts was similar to that of extracts derived from the entirely postmitotic cells of young and senescent adults. Thus, DNA mismatch repair activity is expressed in Drosophila cells during both development and aging, suggesting that there may be a function or requirement for mismatch repair throughout the Drosophila life span. Nick-dependent repair was reduced in extracts of animals mutant for the mei-9 gene. mei-9 has been shown to be required in vivo for certain types of DNA mismatch repair, nucleotide excision repair (NER), and meiotic crossing over and is the Drosophila homolog of the yeast NER gene rad1.

molecular and cellular biology

DNA Mismatch Repair Catalyzed by Extracts of Mitotic, Postmitotic, and Senescent <i>Drosophila</i> Tissues and Involvement of <i>mei-9</i> Gene Function for Full Activity

DNA Mismatch Repair Catalyzed by Extracts of Mitotic, Postmitotic, and Senescent Drosophila Tissues and Involvement of mei-9 Gene Function for Full Activity