Here we report inherited dysregulation of protein phosphatase activity as a cause of intellectual disability (ID). De novo missense mutations in 2 subunits of serine/threonine (Ser/Thr) protein phosphatase 2A (PP2A) were identified in 16 individuals with mild to severe ID, long-lasting hypotonia, epileptic susceptibility, frontal bossing, mild hypertelorism, and downslanting palpebral fissures. PP2A comprises catalytic (C), scaffolding (A), and regulatory (B) subunits that determine subcellular anchoring, substrate specificity, and physiological function. Ten patients had mutations within a highly conserved acidic loop of the
Gunnar Houge, Dorien Haesen, Lisenka E.L.M. Vissers, Sarju Mehta, Michael J. Parker, Michael Wright, Julie Vogt, Shane McKee, John L. Tolmie, Nuno Cordeiro, Tjitske Kleefstra, Marjolein H. Willemsen, Margot R.F. Reijnders, Siren Berland, Eli Hayman, Eli Lahat, Eva H. Brilstra, Koen L.I. van Gassen, Evelien Zonneveld-Huijssoon, Charlotte I. de Bie, Alexander Hoischen, Evan E. Eichler, Rita Holdhus, Vidar M. Steen, Stein Ove Døskeland, Matthew E. Hurles, David R. FitzPatrick, the Deciphering Developmental Disorders (DDD) study, Veerle Janssens
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