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Gen1 and Eme1 Play Redundant Roles in DNA Repair and Meiotic Recombination in Mice.

Resolution of the Holliday junction (HJ) is essential for homologous recombination and DNA repair. In Saccharomyces cerevisiae, HJ resolvase Yen1 and the Mus81-Mms4 complex are redundant in DNA damage repair. In cultured mammalian cells, such redundancy also exists between Yen1 ortholog GEN1 and the Mus81-Mms1 ortholog MUS81-EME1. In this report, we further tested if GEN1 and EME1 redundantly affect HJ-related physiological processes in mice. We found that combined homozygous mutations of Gen1 and Eme1 led to synthetic lethality during early embryonic stages. Homozygous Gen1 mutations did not cause DNA repair deficiency in mouse embryonic fibroblast (MEF) cells, but made heterozygous Eme1 mutant MEFs more sensitive to various DNA-damaging reagents. Gen1 mutations also reduced the meiotic recombination efficiency in Eme1 mutant mice. These results suggest that Gen1 and Eme1 play redundant roles in DNA repair and meiotic recombination in vivo.

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