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Mutations in INPP5K, Encoding a Phosphoinositide 5-Phosphatase, Cause Congenital Muscular Dystrophy with Cataracts and Mild Cognitive Impairment

Lookup NU author(s): Dr Andreas Roos, Daniel Cox, Dr Chiara Marini Bettolo, Dr Rita Barresi, Dr Richard Charlton, Dr Juliane Mueller, Professor Volker Straub, Professor Katherine Bushby, Professor Hanns Lochmuller

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


Abstract

© 2017 The Author(s) Phosphoinositides are small phospholipids that control diverse cellular downstream signaling events. Their spatial and temporal availability is tightly regulated by a set of specific lipid kinases and phosphatases. Congenital muscular dystrophies are hereditary disorders characterized by hypotonia and weakness from birth with variable eye and central nervous system involvement. In individuals exhibiting congenital muscular dystrophy, early-onset cataracts, and mild intellectual disability but normal cranial magnetic resonance imaging, we identified bi-allelic mutations in INPP5K, encoding inositol polyphosphate-5-phosphatase K. Mutations impaired phosphatase activity toward the phosphoinositide phosphatidylinositol (4,5)-bisphosphate or altered the subcellular localization of INPP5K. Downregulation of INPP5K orthologs in zebrafish embryos disrupted muscle fiber morphology and resulted in abnormal eye development. These data link congenital muscular dystrophies to defective phosphoinositide 5-phosphatase activity that is becoming increasingly recognized for its role in mediating pivotal cellular mechanisms contributing to disease.


Publication metadata

Author(s): Wiessner M, Roos A, Munn CJ, Viswanathan R, Whyte T, Cox D, Schoser B, Sewry C, Roper H, Phadke R, Marini Bettolo C, Barresi R, Charlton R, Bonnemann CG, Abath Neto O, Reed UC, Zanoteli E, Araujo Martins Moreno C, Ertl-Wagner B, Stucka R, De Goede C, Borges da Silva T, Hathazi D, Dell'Aica M, Zahedi RP, Thiele S, Muller J, Kingston H, Muller S, Curtis E, Walter MC, Strom TM, Straub V, Bushby K, Muntoni F, Swan LE, Lochmuller H, Senderek J

Publication type: Article

Publication status: Published

Journal: American Journal of Human Genetics

Year: 2017

Volume: 100

Issue: 3

Pages: 523-536

Print publication date: 02/03/2017

Online publication date: 09/02/2017

Acceptance date: 12/01/2017

ISSN (print): 0002-9297

ISSN (electronic): 1537-6605

Publisher: Cell Press

URL: https://doi.org/10.1016/j.ajhg.2017.01.024

DOI: 10.1016/j.ajhg.2017.01.024


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