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Division of the Nucleolus and Its Release of CDC14 during Anaphase of Meiosis I Depends on Separase, SPO12, and SLK19

Lookup NU author(s): Dr Stephan Gruber, Melanie Sullivan

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Abstract

Disjunction of maternal and paternal centromeres during meiosis I requires crossing over between homologous chromatids, which creates chiasmata that hold homologs together. It also depends on a mechanism ensuring that maternal and paternal sister kinetochore pairs attach to oppositely oriented microtubules. Proteolytic cleavage of cohesin's Rec8 subunit by separase destroys cohesion between sister chromatid arms at anaphase I and thereby resolves chiasmata. The Spo12 and Slk19 proteins have been implicated in regulating meiosis I kinetochore orientation and/or in preventing cleavage of Rec8 at centromeres. We show here that the role of these proteins is instead to promote nucleolar segregation, including release of the Cdc14 phosphatase required for Cdk1 inactivation and disassembly of the anaphase I spindle. Separase is also required but surprisingly not its protease activity. It has two mechanistically different roles during meiosis I. Loss of the protease-independent function alone results in a second meiotic division occurring on anaphase I spindles in spo12delta and slk19delta mutants.

Publication metadata

Author(s): Sullivan M; Gruber S; Buonomo SB; Rabitsch KP; Fuchs J; Uhlmann F; Petronczki M; Toth A; Nasmyth K

Publication type: Article

Publication status: Published

Journal: Developmental Cell

Year: 2003

Volume: 4

Issue: 5

Pages: 727-739

ISSN (print): 1534-5807

ISSN (electronic): 1878-1551

Publisher: Cell Press

URL: http://dx.doi.org/10.1016/S1534-5807(03)00129-1

DOI: 10.1016/S1534-5807(03)00129-1

Notes: Journal Article Research Support, Non-U.S. Gov't United States

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