SGO1 but not SGO2 is required for maintenance of centromere cohesion in Arabidopsis thaliana meiosis
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Shugoshin is a protein conserved in eukaryotes and protects sister chromatid cohesion at centromeres in meiosis. In our study, we identified the homologs of SGO1 and SGO2 in Arabidopsis thaliana. We show that AtSGO1 is necessary for the maintenance of centromere cohesion in meiosis I since atsgo1 mutants display premature separation of sister chromatids starting from anaphase I. Furthermore, we show that the localization of the specific centromeric cohesin AtSYN1 is not affected in atsgo1, suggesting that SGO1 centromere cohesion maintenance is not mediated by protection of SYN1 from cleavage. Finally, we show that AtSGO2 is dispensable for both meiotic and mitotic cell progression in Arabidopsis.
KeywordsArabidopsis Meiosis Shugoshin Centromere cohesion
We are grateful to the EMBO Short-Term Fellowship and STSM COST Action FA0903. Work in Sue Armstrong’s laboratory is funded from the European Community’s Seventh Framework Programme FP7/2007-2013 under grant agreement number KBBE-2009-222883. We thank Steve Price for his technical support.
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