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Nachury, Maxence V.; Loktev, Alexander V.; Zhang, Qihong; Westlake, Christopher J.; Peränen, Johan; Merdes, Andreas; Slusarski, Diane C.; Scheller, Richard H.; Bazan, J. Fernando; Sheffield, Val C.; Jackson, Peter K.
Cell, 06/2007, Letnik: 129, Številka: 6Journal Article
Primary cilium dysfunction underlies the pathogenesis of Bardet-Biedl syndrome (BBS), a genetic disorder whose symptoms include obesity, retinal degeneration, and nephropathy. However, despite the identification of 12 BBS genes, the molecular basis of BBS remains elusive. Here we identify a complex composed of seven highly conserved BBS proteins. This complex, the BBSome, localizes to nonmembranous centriolar satellites in the cytoplasm but also to the membrane of the cilium. Interestingly, the BBSome is required for ciliogenesis but is dispensable for centriolar satellite function. This ciliogenic function is mediated in part by the Rab8 GDP/GTP exchange factor, which localizes to the basal body and contacts the BBSome. Strikingly, Rab8GTP enters the primary cilium and promotes extension of the ciliary membrane. Conversely, preventing Rab8GTP production blocks ciliation in cells and yields characteristic BBS phenotypes in zebrafish. Our data reveal that BBS may be caused by defects in vesicular transport to the cilium.
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in: SICRIS
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