3 years ago

De Novo Missense Mutations in DHX30 Impair Global Translation and Cause a Neurodevelopmental Disorder

De Novo Missense Mutations in DHX30 Impair Global Translation and Cause a Neurodevelopmental Disorder
Jolanda H. Schieving, Margot R.F. Reinders, Jill A. Rosenfeld, Tjitske Kleefstra, Erica H. Gerkes, Jennifer E. Posey, Sandra Mercier, Mohammad K. Eldomery, Christian Kubisch, Alexander P.A. Stegmann, Jonas Denecke, Anya Revah-Politi, Estelle Colin, Orly Elpeleg, Vinodh Narayanan, Zeynep Coban-Akdemir, Dominique Bonneau, LaDonna Immken, Marine Tessarech, Magalie Barth, James R. Lupski, Davor Lessel, Kelsey Zegar, Shimon Edvardson, C4RCD Research Group, Keri Ramsey, the DDD study, Matthew Huentelman, Han G. Brunner, Thomas Besnard, Sébastien Küry, Claudia Schob, Hans-Jürgen Kreienkamp, Stefan Kindler, Tim M. Strom, Jenny Morton, Yaping Yang, Benjamin Cogné, Nelly Oundjian, Stéphane Bézieau, Tamar Harel, Naomi Meeks, Ana Claasen, Katherine L. Helbig

DHX30 is a member of the family of DExH-box helicases, which use ATP hydrolysis to unwind RNA secondary structures. Here we identified six different de novo missense mutations in DHX30 in twelve unrelated individuals affected by global developmental delay (GDD), intellectual disability (ID), severe speech impairment and gait abnormalities. While four mutations are recurrent, two are unique with one affecting the codon of one recurrent mutation. All amino acid changes are located within highly conserved helicase motifs and were found to either impair ATPase activity or RNA recognition in different in vitro assays. Moreover, protein variants exhibit an increased propensity to trigger stress granule (SG) formation resulting in global translation inhibition. Thus, our findings highlight the prominent role of translation control in development and function of the central nervous system and also provide molecular insight into how DHX30 dysfunction might cause a neurodevelopmental disorder.

Publisher URL: http://www.cell.com/ajhg/fulltext/S0002-9297(17)30383-X

DOI: 10.1016/j.ajhg.2017.09.014

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