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Loss-of-Function Mutations in UNC45A Cause a Syndrome Associating Cholestasis, Diarrhea, Impaired Hearing, and Bone Fragility

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Esteve, Clothilde | Francescatto, Ludmila | Tan, Perciliz | Bourchany, Aurélie | de Leusse, Cécile | Marinier, Evelyne | Blanchard, Arnaud | Bourgeois, Patrice | Brochier-Armanet, Céline | Bruel, Ange-Line | Delarue, Arnauld | Duffourd, Yannis | Ecochard-Dugelay, Emmanuel | Héry, Géraldine | Huet, Frédéric | Gauchez, Philippe | Gonzales, Emmanuel | Guettier-Bouttier, Catherine | Komuta, Mina | Lacoste, Caroline | Maudinas, Raphaelle | Mazodier, Karin | Rimet, Yves | Riviere, Jean-Baptiste | Roquelaure, Bertrand | Sigaudy, Sabine | Stephenne, Xavier | Thauvin-Robinet, Christel | Thevenon, Julien | Sarles, Jacques | Lévy, Nicolas | Badens, Catherine | Goulet, Olivier | Hugot, Jean-Pierre | Katsanis, Nicholas | Faivre, Laurence | Fabre, Alexandre

Edité par CCSD ; Elsevier (Cell Press) -

International audience. Despite the rapid discovery of genes for rare genetic disorders, we continue to encounter individuals presenting with syndromic manifestations. Here, we have studied four affected people in three families presenting with cholestasis, congenital diarrhea, impaired hearing, and bone fragility. Whole-exome sequencing of all affected individuals and their parents identified biallelic mutations in Unc-45 Myosin Chaperone A (UNC45A) as a likely driver for this disorder. Subsequent in vitro and in vivo functional studies of the candidate gene indicated a loss-of-function paradigm, wherein mutations attenuated or abolished protein activity with concomitant defects in gut development and function.

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