Mammalian SGO2 appears at the inner centromere domain and redistributes depending on tension across centromeres during meiosis II and mitosis

被引:74
作者
Gomez, Rocio
Valdeolmillos, Ana
Parra, Maria Teresa
Viera, Alberto
Carreiro, Candelas
Roncal, Fernando
Rufas, Julio S.
Barbero, Jose L.
Suja, Jose A.
机构
[1] Univ Autonoma Madrid, Dept Biol, Unidad Biol Celular, E-28049 Madrid, Spain
[2] Ctr Nacl Biotecnol, Dept Immunol & Oncol, E-28049 Madrid, Spain
关键词
meiosis; mitosis; shugoshin; 2; sister-chromatid cohesion;
D O I
10.1038/sj.embor.7400877
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Shugoshin (SGO) is a family of proteins that protect centromeric cohesin complexes from release during mitotic prophase and from degradation during meiosis 1. Two mammalian SGO paralogues-SCO1 and SGO2-have been identified, but their distribution and function during mammalian meiosis have not been reported. Here, we analysed the expression of SGO2 during male mouse meiosis and mitosis. During meiosis 1, SGO2 accumulates at centromeres during diplotene, and colocalizes differentially with the cohesin subunits RAD21 and REC8 at metaphase I centromeres. However, SGO2 and RAD21 change their relative distributions during telophase I when sister-kinetochore association is lost. During meiosis II, SGO2 shows a striking tension-dependent redistribution within centromeres throughout chromosome congression during prometaphase II, as it does during mitosis. We propose a model by which the redistribution of SGO2 would unmask cohesive centromere proteins, which would be then released or cleaved by separase, to trigger chromatid segregation to opposite poles.
引用
收藏
页码:173 / 180
页数:8
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