title: Chromosome morphogenesis: condensin-dependent cohesin removal during meiosis.
abstract: During meiosis, segregation of homologous chromosomes necessitates the coordination of sister chromatid cohesion, chromosome condensation, and recombination. Cohesion and condensation require the SMC complexes, cohesin and condensin, respectively. Here we use budding yeast Saccharomyces cerevisiae to show that condensin and Cdc5, a Polo-like kinase, facilitate the removal of cohesin from chromosomes prior to the onset of anaphase I when homologs segregate. This cohesin removal is critical for homolog segregation because it helps dissolve the recombination-dependent links between homologs that form during prophase I. Condensin enhances the association of Cdc5 with chromosomes and its phosphorylation of cohesin, which in turn likely stimulates cohesin removal. Condensin/Cdc5-dependent removal of cohesin underscores the potential importance of crosstalk between chromosome structural components in chromosome morphogenesis and provides a mechanism to couple chromosome morphogenesis with other meiotic events.
authors.affiliation: Howard Hughes Medical Institute/Carnegie Institution, Department of Embryology, Baltimore, Maryland 21218, USA.
authors.forename: Hong-Guo
authors.initials: HG
authors.lastname: Yu
authors.forename: Douglas
authors.initials: D
authors.lastname: Koshland
mesh_terms: D000251:Adenosine Triphosphatases / Q000235:genetics / Q000378:metabolism*; D000705:Anaphase; D018797:Cell Cycle Proteins / Q000235:genetics / Q000378:metabolism*; D002868:Chromosomal Proteins, Non-Histone / Q000378:metabolism; D020090:Chromosome Segregation; D015825:Chromosomes, Fungal / Q000502:physiology*; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D004789:Enzyme Activation; D005656:Fungal Proteins / Q000235:genetics / Q000378:metabolism*; D008540:Meiosis; D046912:Multiprotein Complexes / Q000235:genetics / Q000378:metabolism*; D009154:Mutation; D009687:Nuclear Proteins / Q000235:genetics / Q000378:metabolism*; D010766:Phosphorylation; D011494:Protein Kinases / Q000378:metabolism; D017346:Protein Serine-Threonine Kinases; D012441:Saccharomyces cerevisiae / Q000235:genetics / Q000502:physiology*; D029701:Saccharomyces cerevisiae Proteins / Q000378:metabolism; D012854:Sister Chromatid Exchange; D000097722:Cohesins
chemical_list: D000251:Adenosine Triphosphatases; D018797:Cell Cycle Proteins; D002868:Chromosomal Proteins, Non-Histone; D004268:DNA-Binding Proteins; D005656:Fungal Proteins; D046912:Multiprotein Complexes; D009687:Nuclear Proteins; D011494:Protein Kinases; D017346:Protein Serine-Threonine Kinases; D029701:Saccharomyces cerevisiae Proteins; D000097722:Cohesins; C502898:REC8 protein, S cerevisiae; C108312:condensin complexes; C081927:CDC5 protein, S cerevisiae