PuSH - Publikationsserver des Helmholtz Zentrums München: Disruption of intraflagellar protein transport in photoreceptor cilia causes Leber congenital amaurosis in humans and mice.

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Boldt, K. ; Mans, D.A.* ; Won, J.* ; van Reeuwijk, J.* ; Vogt, A. ; Kinkl, N. ; Letteboer, S.J.* ; Hicks, W.L.* ; Hurd, R.E.* ; Naggert, J.K.* ; Texier, Y. ; den Hollander, A.I.* ; Koenekoop, R.K.* ; Bennett, J.* ; Cremers, F.P.* ; Gloeckner, C.J. ; Nishina, P.M.* ; Roepman, R.* ; Ueffing, M.

Disruption of intraflagellar protein transport in photoreceptor cilia causes Leber congenital amaurosis in humans and mice.

J. Clin. Invest. 121, 2169-2180 (2011)

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The mutations that cause Leber congenital amaurosis (LCA) lead to photoreceptor cell death at an early age, causing childhood blindness. To unravel the molecular basis of LCA, we analyzed how mutations in LCA5 affect the connectivity of the encoded protein lebercilin at the interactome level. In photoreceptors, lebercilin is uniquely localized at the cilium that bridges the inner and outer segments. Using a generally applicable affinity proteomics approach, we showed that lebercilin specifically interacted with the intraflagellar transport (IFT) machinery in HEK293T cells. This interaction disappeared when 2 human LCA-associated lebercilin mutations were introduced, implicating a specific disruption of IFT-dependent protein transport, an evolutionarily conserved basic mechanism found in all cilia. Lca5 inactivation in mice led to partial displacement of opsins and light-induced translocation of arrestin from photoreceptor outer segments. This was consistent with a defect in IFT at the connecting cilium, leading to failure of proper outer segment formation and subsequent photoreceptor degeneration. These data suggest that lebercilin functions as an integral element of selective protein transport through photoreceptor cilia and provide a molecular demonstration that disrupted IFT can lead to LCA.

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