title: Functional conservation of Mei4 for meiotic DNA double-strand break formation from yeasts to mice.
abstract: Meiotic recombination is initiated by the programmed induction of DNA double-strand breaks (DSBs) catalyzed by the evolutionarily conserved Spo11 protein. Studies in yeast have shown that DSB formation requires several other proteins, the role and conservation of which remain unknown. Here we show that two of these Saccharomyces cerevisiae proteins, Mei4 and Rec114, are evolutionarily conserved in most eukaryotes. Mei4(-/-) mice are deficient in meiotic DSB formation, thus showing the functional conservation of Mei4 in mice. Cytological analyses reveal that, in mice, MEI4 is localized in discrete foci on the axes of meiotic chromosomes that do not overlap with DMC1 and RPA foci. We thus propose that MEI4 acts as a structural component of the DSB machinery that ensures meiotic DSB formation on chromosome axes. We show that mouse MEI4 and REC114 proteins interact directly, and we identify conserved motifs as required for this interaction. Finally, the unexpected, concomitant absence of Mei4 and Rec114, as well as of Mnd1, Hop2, and Dmc1, in some eukaryotic species (particularly Neurospora crassa, Drosophila melanogaster, and Caenorhabditis elegans) suggests the existence of Mei4-Rec114-dependent and Mei4-Rec114-independent mechanisms for DSB formation, and a functional relationship between the chromosome axis and DSB formation.
authors.affiliation: Institut de Génétique Humaine, UPR1142, CNRS, 34396 Montpellier Cedex 5, France.
authors.forename: Rajeev
authors.initials: R
authors.lastname: Kumar
authors.forename: Henri-Marc
authors.initials: HM
authors.lastname: Bourbon
authors.forename: Bernard
authors.initials: B
authors.lastname: de Massy
mesh_terms: D020816:Amino Acid Motifs; D000595:Amino Acid Sequence; D000818:Animals; D018797:Cell Cycle Proteins; D002875:Chromosomes; D017124:Conserved Sequence; D053903:DNA Breaks, Double-Stranded; D056890:Eukaryota / Q000235:genetics; D019143:Evolution, Molecular; D005260:Female; D005786:Gene Expression Regulation; D006801:Humans; D008297:Male; D008540:Meiosis; D051379:Mice; D018345:Mice, Knockout; D008969:Molecular Sequence Data; D009687:Nuclear Proteins / Q000235:genetics* / Q000378:metabolism*; D045522:Recombinases / Q000378:metabolism; D011995:Recombination, Genetic; D029701:Saccharomyces cerevisiae Proteins / Q000235:genetics* / Q000378:metabolism*; D016415:Sequence Alignment; D013573:Synaptonemal Complex / Q000378:metabolism; D044767:Ubiquitin-Protein Ligases / Q000235:genetics* / Q000378:metabolism*
chemical_list: D018797:Cell Cycle Proteins; C489538:MEI4 protein, S cerevisiae; D009687:Nuclear Proteins; C080622:REC114 protein, S cerevisiae; D045522:Recombinases; D029701:Saccharomyces cerevisiae Proteins; C523697:Ccnb1ip1 protein, mouse; D044767:Ubiquitin-Protein Ligases