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Role of cleavage by separase of the Rec8 kleisin subunit of cohesin during mammalian meiosis I

Titelangaben

Kudo, Nobuaki R. ; Anger, Martin ; Peters, Antoine H. ; Stemmann, Olaf ; Theussl, Hans-Christian ; Helmhart, Wolfgang ; Kudo, Hiromi ; Heyting, Christa ; Nasmyth, Kim:
Role of cleavage by separase of the Rec8 kleisin subunit of cohesin during mammalian meiosis I.
In: Journal of Cell Science. Bd. 122 (2009) Heft 15 . - S. 2686-2698.
ISSN 1477-9137
DOI: https://doi.org/10.1242/jcs.035287

Volltext

Link zum Volltext (externe URL): Volltext

Abstract

Proteolytic activity of separase is required for chiasma resolution during meiosis I in mouse oocytes. Rec8, the meiosis-specific alpha-kleisin subunit of cohesin, is a key target of separase in yeast. Is the equivalent protein also a target in mammals? We show here that separase cleaves mouse Rec8 at three positions in vitro but only when the latter is hyper-phosphorylated. Expression of a Rec8 variant (Rec8-N) that cannot be cleaved in vitro at these sites causes sterility in male mice. Their seminiferous tubules lack a normal complement of 2 C secondary spermatocytes and 1 C spermatids and contain instead a high proportion of cells with enlarged nuclei. Chromosome spreads reveal that Rec8-N expression has no effect in primary spermatocytes but produces secondary spermatocytes and spermatids with a 4 C DNA content, suggesting that the first and possibly also the second meiotic division is abolished. Expression of Rec8-N in oocytes causes chromosome segregation to be asynchronous and delays its completion by 2-3 hours during anaphase I, probably due to inefficient proteolysis of Rec8-N by separase. Despite this effect, chromosome segregation must be quite accurate as Rec8-N does not greatly reduce female fertility. Our data is consistent with the notion that Rec8 cleavage is important and probably crucial for the resolution of chiasmata in males and females.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Institutionen der Universität: Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Biologie > Lehrstuhl Genetik > Lehrstuhl Genetik - Univ.-Prof. Dr. Olaf Stemmann
Profilfelder > Advanced Fields > Molekulare Biowissenschaften
Forschungseinrichtungen > Forschungszentren > Bayreuther Zentrum für Molekulare Biowissenschaften - BZMB
Fakultäten
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Biologie
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Biologie > Lehrstuhl Genetik
Profilfelder
Profilfelder > Advanced Fields
Forschungseinrichtungen
Forschungseinrichtungen > Forschungszentren
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik > 570 Biowissenschaften; Biologie
Eingestellt am: 26 Mär 2015 10:13
Letzte Änderung: 29 Jun 2022 14:50
URI: https://eref.uni-bayreuth.de/id/eprint/8457