||Phosphorylation of the synaptonemal complex protein SYP-1 promotes meiotic chromosome segregation
Sato-Carlton, Aya ,
Nakamura-Tabuchi, Chihiro ,
Chartrand, Stephane Kazuki ,
Uchino, TomokiCarlton, Peter Mark
The Journal of Cell Biology
570 , 2017-12-08 , Rockefeller University Press
正常な卵子を生み出す細胞分裂に必須の分子メカニズムを解明. 京都大学プレスリリース. 2017-12-28.
Chromosomes that have undergone crossing over in meiotic prophase must maintain sister chromatid cohesion somewhere along their length between the first and second meiotic divisions. Although many eukaryotes use the centromere as a site to maintain cohesion, the holocentric organism Caenorhabditis elegans instead creates two chromosome domains of unequal length termed the short arm and long arm, which become the first and second site of cohesion loss at meiosis I and II. The mechanisms that confer distinct functions to the short and long arm domains remain poorly understood. Here, we show that phosphorylation of the synaptonemal complex protein SYP-1 is required to create these domains. Once crossover sites are designated, phosphorylated SYP-1 and PLK-2 become cooperatively confined to short arms and guide phosphorylated histone H3 and the chromosomal passenger complex to the site of meiosis I cohesion loss. Our results show that PLK-2 and phosphorylated SYP-1 ensure creation of the short arm subdomain, promoting disjunction of chromosomes in meiosis I.