The mammalian mid-pachytene checkpoint: meiotic arrest in spermatocytes with a mutation in Atm alone or in combination with a Trp53 (p53) or Cdkn1a (p21/cip1) mutation.
ATM, the protein product of the gene mutated in the human autosomal recessive disorder ataxia telangiectasia, is involved in detection of double strand breaks (DSBs) and is a key component of the damage surveillance network of cell cycle proteins. In somatic cells ATM phosphorylates many other proteins including p53, an important regulator of cell cycle control. Mice deficient for Atm are male sterile with arrest and apoptosis occurring at testis epithelial stage IV, which in normal spermatocytes corresponds to mid-pachynema. Unlike the situation in somatic cells, we find no evidence that disruption of the Trp53 (p53) gene, or its down-stream target Cdkn1a (p21/Cip1) results in even a partial rescue of the Atm defect.
Department of Genetics, Yale University School of Medicine, New Haven, CT 06510, USA. terry.ashley@syale.edu
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D000818:Animals; D017209:Apoptosis; D064007:Ataxia Telangiectasia Mutated Proteins; D018797:Cell Cycle Proteins / Q000235:genetics* / Q000378:metabolism; D050759:Cyclin-Dependent Kinase Inhibitor p21; D004268:DNA-Binding Proteins / Q000172:deficiency / Q000235:genetics* / Q000378:metabolism; D005260:Female; D008297:Male; D008540:Meiosis; D051379:Mice; D009154:Mutation / Q000235:genetics*; D017346:Protein Serine-Threonine Kinases / Q000172:deficiency / Q000235:genetics* / Q000378:metabolism; D051135:Rad51 Recombinase; D013090:Spermatocytes / Q000166:cytology* / Q000378:metabolism*; D016159:Tumor Suppressor Protein p53 / Q000172:deficiency / Q000235:genetics* / Q000378:metabolism; D025521:Tumor Suppressor Proteins / Q000172:deficiency / Q000235:genetics* / Q000378:metabolism
C493957:Cdkn1a protein, mouse; D018797:Cell Cycle Proteins; D050759:Cyclin-Dependent Kinase Inhibitor p21; D004268:DNA-Binding Proteins; D016159:Tumor Suppressor Protein p53; D025521:Tumor Suppressor Proteins; C576324:ATM protein, human; D064007:Ataxia Telangiectasia Mutated Proteins; C576325:Atm protein, mouse; D017346:Protein Serine-Threonine Kinases; D051135:Rad51 Recombinase; C495154:Rad51 protein, mouse