Rare pathogenic variants in WNK3 cause X-linked intellectual disability

Sébastien Küry, Jinwei Zhang, Thomas Besnard, Alfonso Caro-Llopis, Xue Zeng, Stephanie M Robert, Sunday S Josiah, Emre Kiziltug, Anne-Sophie Denommé-Pichon, Benjamin Cogné, Adam J Kundishora, Le T Hao, Hong Li, Roger E Stevenson, Raymond J Louie, Wallid Deb, Erin Torti, Virginie Vignard, Kirsty McWalter, F Lucy RaymondFarrah Rajabi, Emmanuelle Ranza, Detelina Grozeva, Stephanie A Coury, Xavier Blanc, Elise Brischoux-Boucher, Boris Keren, Katrin Õunap, Karit Reinson, Pilvi Ilves, Ingrid M Wentzensen, Eileen E Barr, Solveig Heide Guihard, Perrine Charles, Eleanor G Seaby, Kristin G Monaghan, Marlène Rio, Yolande van Bever, Marjon van Slegtenhorst, Wendy K Chung, Ashley Wilson, Delphine Quinquis, Flora Bréhéret, Kyle Retterer, Pierre Lindenbaum, Emmanuel Scalais, Lindsay Rhodes, Katrien Stouffs, Elaine M Pereira, Sara M Berger, Sarah S Milla, Ankita B Jaykumar, Melanie H Cobb, Shreyas Panchagnula, Phan Q Duy, Marie Vincent, Sandra Mercier, Brigitte Gilbert-Dussardier, Xavier Le Guillou, Séverine Audebert-Bellanger, Sylvie Odent, Sébastien Schmitt, Pierre Boisseau, Dominique Bonneau, Annick Toutain, Estelle Colin, Laurent Pasquier, Richard Redon, Arjan Bouman, Jill A Rosenfeld, Michael J Friez, Helena Pérez-Peña, Syed Raza Akhtar Rizvi, Shozeb Haider, Stylianos E Antonarakis, Charles E Schwartz, Francisco Martínez, Stéphane Bézieau, Kristopher T Kahle, Bertrand Isidor

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Abstract

PURPOSE: WNK3 kinase (PRKWNK3) has been implicated in the development and function of the brain via its regulation of the cation-chloride cotransporters, but the role of WNK3 in human development is unknown.

METHOD: We ascertained exome or genome sequences of individuals with rare familial or sporadic forms of intellectual disability (ID).

RESULTS: We identified a total of 6 different maternally-inherited, hemizygous, 3 loss-of-function or 3 pathogenic missense variants (p.Pro204Arg, p.Leu300Ser, p.Glu607Val) in WNK3 in 14 male individuals from 6 unrelated families. Affected individuals had identifier with variable presence of epilepsy and structural brain defects. WNK3 variants cosegregated with the disease in 3 different families with multiple affected individuals. This included 1 large family previously diagnosed with X-linked Prieto syndrome. WNK3 pathogenic missense variants localize to the catalytic domain and impede the inhibitory phosphorylation of the neuronal-specific chloride cotransporter KCC2 at threonine 1007, a site critically regulated during the development of synaptic inhibition.

CONCLUSION: Pathogenic WNK3 variants cause a rare form of human X-linked identifier with variable epilepsy and structural brain abnormalities and implicate impaired phospho-regulation of KCC2 as a pathogenic mechanism.

Original languageEnglish
Pages (from-to)1941-1951
Number of pages11
JournalGenetics in Medicine : Official Journal of the American College of Medical Genetics
Volume24
Issue number9
Early online date9 Jun 2022
DOIs
Publication statusPublished - Sep 2022

Bibliographical note

Copyright © 2022 American College of Medical Genetics and Genomics. Published by Elsevier Inc. All rights reserved.

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