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A PIGH mutation leading to GPI deficiency is associated with developmental delay and autism.

Hum Mutat. 2018 Mar 30;:

Authors: Nguyen TTM, Mahida SD, Smith-Hicks C, Campeau PM

We identified an individual with a homozygous missense variant (p.Ser103Pro) in a conserved residue of the GPI biosynthesis gene PIGH. This gene encodes an essential component of the phosphatidylinositol N-acetylglucosaminyltransferase complex, in the first step of the biosynthesis of glycosylphosphatidylinositol, a glycolipid anchor added to more than one hundred human proteins, several being critical for embryogenesis and neurological functions. The affected individual had hypotonia, moderate developmental delay, and autism. Unlike other reported individuals with GPI deficiency, the proband did not have epilepsy, however, he did have two episodes of febrile seizures. He had normal alkaline phosphatase and no brachytelephalangy. Upon analysis of the surface expression of GPI-anchored proteins on granulocytes, he was demonstrated to have a GPI deficiency. This suggest that PIGH mutations may cause a syndrome with developmental delay and autism, but without an epileptic encephalopathy, and should increase the awareness of the potentially deleterious nature of bi-allelic variants in this gene. This article is protected by copyright. All rights reserved.

PMID: 29603516 [PubMed – as supplied by publisher]

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