|
 |
|
|
|
EMBO reports 8, 2, 173–180 (2007)
doi:10.1038/sj.embor.7400877
AOP Published online: 5 January 2007
Mammalian SGO2 appears at the inner centromere domain and redistributes depending on tension across centromeres during meiosis II and mitosis
Rocío Gómez1*, Ana Valdeolmillos2*, María Teresa Parra1, Alberto Viera1, Candelas Carreiro2, Fernando Roncal2, Julio S Rufas1, José L Barbero2 & José A Suja1
|
|
|
|
1 Unidad de Biología Celular, Departamento de Biología, Universidad Autónoma de Madrid, Calle Darwin 2, E-28049 Madrid, Spain
2 Department of Immunology and Oncology, Centro Nacional de Biotecnología, Calle Darwin 3, E-28049 Madrid, Spain
To whom correspondence should be addressed
José A Suja Tel: +34 91 4978240; Fax: +34 91 4978344; E-mail: jose.suja@uam.es
* These authors contributed equally to this work
Received 26 May 2006; Accepted 9 November 2006; Published online 5 January 2007.
|
|
|
|
Abstract
Shugoshin (SGO) is a family of proteins that protect centromeric cohesin complexes from release during mitotic prophase and from degradation during meiosis I. Two mammalian SGO paralogues—SGO1 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 I, 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.
|
 |
|
Top of page MORE ARTICLES LIKE THIS These links to content published by NPG are automatically generated | |
|
top  |
|
|
|
