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

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-e...

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Bibliographic Details
Published in:American journal of human genetics 2018-03, Vol.102 (3), p.364-374
Main Authors: Esteve, Clothilde, Francescatto, Ludmila, Tan, Perciliz L., Bourchany, Aurélie, De Leusse, Cécile, Marinier, Evelyne, Blanchard, Arnaud, Bourgeois, Patrice, Brochier-Armanet, Céline, Bruel, Ange-Line, Delarue, Arnauld, Duffourd, Yannis, Ecochard-Dugelay, Emmanuelle, Hery, Géraldine, Huet, Frédéric, Gauchez, Philippe, Gonzales, Emmanuel, Guettier-Bouttier, Catherine, Komuta, Mina, Lacoste, Caroline, Maudinas, Raphaelle, Mazodier, Karin, Rimet, Yves, Rivière, Jean-Baptiste, Roquelaure, Bertrand, Sigaudy, Sabine, Stephenne, Xavier, Thauvin-Robinet, Christel, Thevenon, Julien, Sarles, Jacques, Levy, Nicolas, Badens, Catherine, Goulet, Olivier, Hugot, Jean-Pierre, Katsanis, Nicholas, Faivre, Laurence, Fabre, Alexandre
Format: Article
Language:English
Subjects:
Adolescent
Animals
Bone and Bones - pathology
Child, Preschool
Cholestasis - genetics
Diarrhea - genetics
Diarrhea - physiopathology
Family
Female
Fibroblasts - pathology
Gastrointestinal Motility
GCUNC-45
Genetics
Hearing Loss - genetics
Human genetics
Humans
Infant, Newborn
Intracellular Signaling Peptides and Proteins - genetics
Life Sciences
Loss of Function Mutation - genetics
Lymphocytes - pathology
Male
Pedigree
Phenotype
Syndrome
Young Adult
Zebrafish
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Summary: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.
ISSN:0002-9297
1537-6605
DOI:10.1016/j.ajhg.2018.01.009