Transient expression of Saccharomyces cerevisiae endo-exonuclease NUD1 gene increases the frequency of extrachromosomal homologous recombina-tion in mouse Ltk-fibroblasts

Endo-exonucleases (EEs) are nucleolytic enzymes which have been shown to pa rticipate in the processes of DNA repair and recombination in eukaryotes. R ecently, we have demonstrated that transient expression of Saccharomyces ce revisiae EE NUD1 gene in HeLa cells increased the resistance of the latter to ionizing radiation and cisplatin, suggesting the involvement of the NUD1 gene product in the recombination repair of double-strand breaks (DSB). He re, we report that transient expression of NUD1 results in up to 62% increa se in the frequency of homologous recombination between two co-transfected linear plasmids in mouse Ltk- cells. (C) 1999 Elsevier Science B.V. All rig hts reserved.