title: Meiosis I chromosome segregation is established through regulation of microtubule-kinetochore interactions.
abstract: During meiosis, a single round of DNA replication is followed by two consecutive rounds of nuclear divisions called meiosis I and meiosis II. In meiosis I, homologous chromosomes segregate, while sister chromatids remain together. Determining how this unusual chromosome segregation behavior is established is central to understanding germ cell development. Here we show that preventing microtubule-kinetochore interactions during premeiotic S phase and prophase I is essential for establishing the meiosis I chromosome segregation pattern. Premature interactions of kinetochores with microtubules transform meiosis I into a mitosis-like division by disrupting two key meiosis I events: coorientation of sister kinetochores and protection of centromeric cohesin removal from chromosomes. Furthermore we find that restricting outer kinetochore assembly contributes to preventing premature engagement of microtubules with kinetochores. We propose that inhibition of microtubule-kinetochore interactions during premeiotic S phase and prophase I is central to establishing the unique meiosis I chromosome segregation pattern.DOI:http://dx.doi.org/10.7554/eLife.00117.001.
authors.affiliation: Department of Biology ,  Massachusetts Institute of Technology ,  Cambridge ,  United States.
authors.forename: Matthew P
authors.initials: MP
authors.lastname: Miller
authors.forename: Elçin
authors.initials: E
authors.lastname: Unal
authors.forename: Gloria A
authors.initials: GA
authors.lastname: Brar
authors.forename: Angelika
authors.initials: A
authors.lastname: Amon
mesh_terms: D002842:Chromatids / Q000378:metabolism / Q000648:ultrastructure; D020090:Chromosome Segregation; D015825:Chromosomes, Fungal; D004261:DNA Replication; D015966:Gene Expression Regulation, Fungal; D018386:Kinetochores / Q000378:metabolism* / Q000648:ultrastructure; D008540:Meiosis; D008870:Microtubules / Q000378:metabolism* / Q000648:ultrastructure; D008938:Mitosis; D012441:Saccharomyces cerevisiae / Q000235:genetics* / Q000378:metabolism / Q000648:ultrastructure; D029701:Saccharomyces cerevisiae Proteins / Q000235:genetics* / Q000378:metabolism; D015398:Signal Transduction
chemical_list: D029701:Saccharomyces cerevisiae Proteins
keywords: S. cerevisiae; chromosome segregation; cohesin; cyclin-dependent kinase; kinetochore; meiosis; tension