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Open Access item Shugoshin-2 is essential for the completion of meiosis but not for mitotic cell division in mice

Authors:Llano, Elena
Gutiérrez-Caballero, Cristina
Herrán, Yurema
Sánchez-Martín, Manuel
Vázquez-Quiñones, Luis
Hernández, M. Teresa
Álava, Enrique de
Cuadrado, Ana
Barbero, José Luis
Pendás, Alberto M.
Keywords:Cohesion, Mitosis, Meiosis
Issue Date:1-Sep-2008
Publisher:Cold Spring Harbor Laboratory. Press
Citation:Genes and Development 22: 2400-2413 (2008)
Abstract:Shugoshin-2 (SGOL2) is one of the two mammalian orthologs of the Shugoshin/Mei-S322 family of proteins that regulate sister chromatid cohesion by protecting the integrity of the multiprotein cohesin complexes. This protective system is essential for faithful chromosome segregation during mitosis and meiosis, which is the physical basis of Mendelian inheritance. Regardless of its evolutionary conservation from yeast to mammals, little is known about the in vivo relevance and specific role that SGOL2 plays in mammals. Here we show that disruption of the gene encoding mouse SGOL2 does not cause any alteration in sister chromatid cohesion in embryonic cultured fibroblasts and adult somatic tissues. Moreover, mutant mice develop normally and survive to adulthood without any apparent alteration. However, both male and female Sgol2 deficient mice are infertile. We demonstrate that SGOL2 is necessary for protecting centromeric cohesion during mammalian meiosis I. In vivo, the loss of SGOL2 promotes a premature release of the meiosis-specific REC8 cohesin complexes from anaphase I centromeres. This molecular alteration is manifested cytologically by the complete loss of centromere cohesion at metaphase II leading to single chromatids and physiologically with the formation of aneuploid gametes that give rise to infertility.
Description:14 páginas, 6 figuras.-- et al.
Publisher version (URL):http://dx.doi.org/10.1101/gad.475308
URI:http://hdl.handle.net/10261/51887
ISSN:0890-9369
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