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RBMX is a component of the centromere noncoding RNP complex involved in cohesion regulation
Author(s) -
Cho Yukiko,
Ideue Takashi,
Nagayama Megumi,
Araki Norie,
Tani Tokio
Publication year - 2018
Publication title -
genes to cells
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.912
H-Index - 115
eISSN - 1365-2443
pISSN - 1356-9597
DOI - 10.1111/gtc.12562
Subject(s) - biology , establishment of sister chromatid cohesion , rna , centromere , sister chromatids , microbiology and biotechnology , mitosis , gene knockdown , chromatid , chromosome segregation , genetics , chromosome , gene
Satellite I RNA, a noncoding (nc)RNA transcribed from repetitive regions in human centromeres, binds to Aurora kinase B and forms a ncRNP complex required for chromosome segregation. To examine its function in this process, we purified satellite I ncRNP complex from nuclear extracts prepared from asynchronized or mitotic (M) phase‐arrested HeLa cells and then carried out LC/MS to identify proteins bound to satellite I RNA. RBMX (RNA‐binding motif protein, X‐linked), which was isolated from M phase‐arrested cells, was selected for further characterization. We found that RBMX associates with satellite I RNA only during M phase. Knockdown of RBMX induced premature separation of sister chromatid cohesion and abnormal nuclear division. Likewise, knockdown of satellite I RNA also caused premature separation of sister chromatids during M phase. The amounts of RBMX and Sororin, a cohesion regulator, were reduced in satellite I RNA‐depleted cells. These results suggest that satellite I RNA plays a role in stabilizing RBMX and Sororin in the ncRNP complex to maintain proper sister chromatid cohesion.