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- W2000940006 abstract "Hyperphosphatasia with neurologic deficit (Mabry syndrome) was first described in a single family (OMIM#239300) by Mabry et al. (1970) . Although considered rare at the time, more than 20 individuals with the triad of developmental disability, seizures, and hyperphosphatasia have been identified world-wide. The 1–6 mannosyltransferase 2, phosphatidylinositol glycan V ( PIGV ) gene has been found to be disrupted in some patients with the additional feature of brachytelephalangy. To date, approximately 50% of these patients have been identified to be either homozygous or compound homozygous for PIGV mutations. Here we present four cases with PIGV mutations. Two siblings were found to be compound heterozygotes for c.467G>A and c.494C>A in exon 3 of PIGV (the c.494C>A PIGV variant is novel). A third patient with similar phenotype, was a compound heterozygote for the known c.1022C>A/c.1022C> (p.Ala341Glu/p.Ala341Val) mutation. This patient was also noted to have lysosomal storage in cultured fibroblasts – a feature present in approximately half of known cases – both PIGV positive and negative. In contrast, the fourth patient who had no apparent hand abnormality, was found to be heterozygous for a previously unclassified c.1369C>T mutation in exon 4 of the PIGV gene, resulting in a p.Leu457Phe substitution in the catalytic domain of the enzyme. Unless this variant has a dominant negative effect, however, it seems likely that another GPI biosynthesis gene variant may contribute to the disorder, possibly through digenic inheritance. Since half of these cases ( Thompson et al., 2010 , Thompson et al., 2012 ) have PIGV mutations, we suggest that other genes critical to GPI anchor biosynthesis are likely to be disrupted in some patients." @default.
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- W2000940006 date "2013-06-01" @default.
- W2000940006 modified "2023-10-16" @default.
- W2000940006 title "9. Phenotypic variability in Mabry syndrome: Hyperphosphatasia with seizures and neurologic deficit" @default.
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- W2000940006 doi "https://doi.org/10.1016/j.clinph.2012.08.047" @default.
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