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JOURNAL ARTICLE
RESEARCH SUPPORT, N.I.H., EXTRAMURAL
Role for the IFT-A Complex in Selective Transport to the Primary Cilium.
Cell Reports 2016 November 2
Intraflagellar transport sub-complex A (IFT-A) is known to regulate retrograde IFT in the cilium. To rigorously assess its other possible roles, we knocked out an IFT-A subunit, IFT121/WDR35, in mammalian cells and screened the localization of more than 50 proteins. We found that Wdr35 regulates cilium assembly by selectively regulating transport of distinct cargoes. Beyond its role in retrograde transport, we show that Wdr35 functions in fusion of Rab8 vesicles at the nascent cilium, protein exit from the cilium, and centriolar satellite organization. Furthermore, we show that Wdr35 is essential for entry of many membrane proteins into the cilium through robust interactions with cargoes and other IFT-A subunits, but the actin network functions to dampen this transport. Wdr35 is mutated in several ciliopathies, and we find that certain disease mutations impair interactions with cargo and other IFT-A subunits. Together, our data link defects in IFT-A mediated cargo transport with disease.
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