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Tight Junction Component Occludin Binds to FIP5 to Regulate Endosome Trafficking and Mitotic Spindle Function

Adv Sci (Weinh). 2024-06; 
Zichao Zhang , Jing Chen , Rongze Ma , Chongshen Xu , Yunzhe Lu , Jiecan Zhou , Kun Xia , Pengfei Lu
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Abstract

The genetic basis of vertebrate emergence during metazoan evolution has remained largely unknown. Understanding vertebrate-specific genes, such as the tight junction protein Occludin (Ocln), may help answer this question. Here, it is shown that mammary glands lacking Ocln exhibit retarded epithelial branching, owing to reduced cell proliferation and surface expansion. Interestingly, Ocln regulates mitotic spindle orientation and function, and its loss leads to a range of defects, including prolonged prophase and failed nuclear and/or cytoplasmic division. Mechanistically, Ocln binds to the RabGTPase-11 adaptor FIP5 and recruits recycling endosomes to the centrosome to participate in spindle assembly and functio... More

Keywords

RAB proteins; branching morphogenesis; centrosome; epithelial migration; spindle organization; vertebrate‐specific genes; vesicular trafficking.