Journal
DEVELOPMENTAL CELL
Volume 40, Issue 1, Pages 81-94Publisher
CELL PRESS
DOI: 10.1016/j.devcel.2016.11.019
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Funding
- Research Grants Council of Hong Kong
- National Key Basic Research Program of China [2013CB530900]
- University Grants Committee (Area of Excellence Scheme) of Hong Kong
- Innovation and Technology Commission of Hong Kong [ITCPD/17-9]
- TUYF Charitable Trust
- Offices of the Provost, VPRG
- HKUST [VPRGO12SC02]
- Hong Kong Research Grants Council [HKUST12/CRF/13G, C6030-14E]
- Hong Kong Ph.D. Fellowship Scheme
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Mitotic spindle formation and chromosome segregation require timely separation of the two duplicated centrosomes, and this process is initiated in late G2 by centrosome disjunction. Here we report that GAS2L1, a microtubule- and actin-binding protein, associates with the proximal end of mature centrioles and participates in centriole dynamics and centrosome disjunction. GAS2L1 attaches microtubules and actin to centrosomes, and the loss of GAS2L1 inhibits centrosome disjunction in G2 and centrosome splitting induced by depletion of the centrosome linker rootletin. Conversely, GAS2L1 overexpression induces premature centrosome separation, and this activity requires GAS2L1 association with actin, microtubules, and the microtubule end-binding proteins. The centrosome-splitting effect of GAS2L1 is counterbalanced by rootletin, reflecting the opposing actions of GAS2L1 and the centrosome linker. Our work reveals a GAS2L1-mediated centriole-tethering mechanism of microtubules and actin, which provide the forces required for centrosome dynamics and separation.
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