ZIP4H (TEX11) deficiency in the mouse impairs meiotic double strand break repair and the regulation of crossing over.
We have recently shown that hypomorphic Mre11 complex mouse mutants exhibit defects in the repair of meiotic double strand breaks (DSBs). This is associated with perturbation of synaptonemal complex morphogenesis, repair and regulation of crossover formation. To further assess the Mre11 complex's role in meiotic progression, we identified testis-specific NBS1-interacting proteins via two-hybrid screening in yeast. In this screen, Zip4h (Tex11), a male germ cell specific X-linked gene was isolated. Based on sequence and predicted structural similarity to the S. cerevisiae and A. thaliana Zip4 orthologs, ZIP4H appears to be the mammalian ortholog. In S. cerevisiae and A. thaliana, Zip4 is a meiosis-specific protein that regulates the level of meiotic crossovers, thus influencing homologous chromosome segregation in these organisms. As is true for hypomorphic Nbs1 (Nbs1(DeltaB/DeltaB)) mice, Zip4h(-/Y) mutant mice were fertile. Analysis of spermatocytes revealed a delay in meiotic double strand break repair and decreased crossover formation as inferred from DMC1 and MLH1 staining patterns, respectively. Achiasmate chromosomes at the first meiotic division were also observed in Zip4h(-/Y) mutants, consistent with the observed reduction in MLH1 focus formation. These results indicate that meiotic functions of Zip4 family members are conserved and support the view that the Mre11 complex and ZIP4H interact functionally during the execution of the meiotic program in mammals.
Adelman
Carrie A
CA
Molecular Biology and Genetics Program, Sloan-Kettering Institute, New York, New York, United States of America.
Petrini
John H J
JH
D000818:Animals; D018797:Cell Cycle Proteins / Q000235:genetics / Q000502:physiology; D003434:Crossing Over, Genetic / Q000235:genetics* / Q000502:physiology*; D053903:DNA Breaks, Double-Stranded; D004260:DNA Repair / Q000235:genetics* / Q000502:physiology*; D045643:DNA Repair Enzymes / Q000235:genetics / Q000502:physiology; D004268:DNA-Binding Proteins / Q000235:genetics / Q000502:physiology; D018390:Gene Targeting; D006801:Humans; D000076228:MRE11 Homologue Protein; D008297:Male; D008540:Meiosis / Q000235:genetics / Q000502:physiology; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D008817:Mice, Mutant Strains; D009687:Nuclear Proteins / Q000235:genetics / Q000502:physiology; D011506:Proteins / Q000235:genetics* / Q000502:physiology*; D013090:Spermatocytes / Q000166:cytology / Q000378:metabolism; D013091:Spermatogenesis / Q000235:genetics / Q000502:physiology; D013737:Testis / Q000378:metabolism; D020798:Two-Hybrid System Techniques; D014960:X Chromosome / Q000235:genetics
D018797:Cell Cycle Proteins; D004268:DNA-Binding Proteins; C512689:Mre11a protein, mouse; C466108:Nijmegen breakage syndrome 1 protein, mouse; D009687:Nuclear Proteins; D011506:Proteins; C528721:Tex11 protein, mouse; D000076228:MRE11 Homologue Protein; D045643:DNA Repair Enzymes