Phospho-H2A and cohesin specify distinct tension-regulated sgo1 pools at kinetochores and inner centromeres

Hong Liu, Luying Jia, Hongtao Yu

Research output: Contribution to journalArticle

74 Scopus citations

Abstract

Accurate chromosome segregation requires coordination between the dissolution of sister-chromatid cohesion and the establishment of proper kinetochore-microtubule attachment [1-6]. During mitosis, sister-chromatid cohesion at centromeres enables the biorientation of and tension across sister kinetochores. The complex between shugoshin and protein phosphatase 2A (Sgo1-PP2A) localizes to centromeres in mitosis [7-10], binds to cohesin in a reaction requiring Cdk-dependent phosphorylation of Sgo1 [11], dephosphorylates cohesin-bound sororin [11], and protects a centromeric pool of cohesin from mitotic kinases and the cohesin inhibitor Wapl [11-14]. Cleavage of centromeric cohesin by separase allows sister chromatids connected to microtubules from opposing poles to be evenly partitioned into daughter cells [15, 16]. The centromeric localization of Sgo1 requires histone H2A phosphorylation at T120 (H2A-pT120) by the kinase Bub1 [17-19]. The exact role of H2A-pT120 in Sgo1 regulation is, however, unclear. Here, we show that cohesin and H2A-pT120 specify two distinct pools of Sgo1-P2A at inner centromeres and kinetochores, respectively, in human cells. Bub1 inactivation delocalizes cohesin-Sgo1 to chromosome arms. Kinetochore tension triggers Sgo1 dephosphorylation and redistributes Sgo1 from inner centromeres to kinetochores. Incomplete Sgo1 redistribution causes chromosome nondisjunction. Our study suggests that Bub1-mediated H2A phosphorylation penetrates kinetochores and that this histone mark contributes to a tension-sensitive Sgo1-based molecular switch for chromosome segregation.

Original languageEnglish (US)
Pages (from-to)1927-1933
Number of pages7
JournalCurrent Biology
Volume23
Issue number19
DOIs
StatePublished - Oct 7 2013

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Agricultural and Biological Sciences(all)

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