title: mei-41 is required for precocious anaphase in Drosophila females.
abstract: This paper reports on a new role for mei-41 in cell cycle control during meiosis. This function is revealed by the requirement of mei-41 for the precocious anaphase observed in crossover-defective mutants. Normally in Drosophila oocytes, tension on the meiotic spindle causes a metaphase I arrest. This tension results because crossovers, and the resulting chiasmata, hold homologs together that are being pulled by kinetochore microtobules toward opposite spindle poles. In the absence of tension, such as in a recombination-defective mutant, metaphase arrest is not observed and meiosis proceeds through the two divisions. Here we show that in some recombination-defective mutants, the precocious anaphase requires the mei-41 gene product. For example, metaphase arrest is not observed in mei-218 mutants because of the severe reduction in crossing over. In mei-41 mei-218 double mutants, however, metaphase arrest was restored. The effect of mei-41 is dependent on double-strand break formation. Thus, in mutants that fail to initiate meiotic recombination the absence of mei-41 has no effect.
authors.affiliation: Section of Molecular and Cellular Biology, University of California at Davis, 95616, USA.
authors.forename: K S
authors.initials: KS
authors.lastname: McKim
authors.forename: J K
authors.initials: JK
authors.lastname: Jang
authors.forename: J J
authors.initials: JJ
authors.lastname: Sekelsky
authors.forename: A
authors.initials: A
authors.lastname: Laurencon
authors.forename: R S
authors.initials: RS
authors.lastname: Hawley
mesh_terms: D000705:Anaphase / Q000235:genetics*; D000818:Animals; D002453:Cell Cycle / Q000235:genetics; D018797:Cell Cycle Proteins / Q000378:metabolism*; D000071877:Checkpoint Kinase 1; D019457:Chromosome Breakage / Q000235:genetics; D004330:Drosophila / Q000235:genetics*; D029721:Drosophila Proteins; D004527:Egg Proteins / Q000235:genetics; D005260:Female; D005656:Fungal Proteins / Q000235:genetics / Q000378:metabolism* / Q000494:pharmacology; D047908:Intracellular Signaling Peptides and Proteins; D008540:Meiosis / Q000235:genetics; D008677:Metaphase / Q000235:genetics; D016297:Mutagenesis, Site-Directed; D009865:Oocytes / Q000187:drug effects / Q000378:metabolism; D011494:Protein Kinases / Q000235:genetics; D017346:Protein Serine-Threonine Kinases; D011995:Recombination, Genetic; D029701:Saccharomyces cerevisiae Proteins; D015398:Signal Transduction / Q000235:genetics; D008941:Spindle Apparatus / Q000235:genetics
chemical_list: D018797:Cell Cycle Proteins; D029721:Drosophila Proteins; D004527:Egg Proteins; D005656:Fungal Proteins; D047908:Intracellular Signaling Peptides and Proteins; D029701:Saccharomyces cerevisiae Proteins; C114493:spn-B protein, Drosophila; D011494:Protein Kinases; D000071877:Checkpoint Kinase 1; C088937:MEC1 protein, S cerevisiae; D017346:Protein Serine-Threonine Kinases