Premium
Phenotypic and molecular insights into PQBP1 ‐related intellectual disability
Author(s) -
AbdelSalam Ghada M. H.,
Miyake Noriko,
AbdelHamid Mohamed S.,
Sayed Inas S. M.,
Gadelhak Mohamed I.,
Ismail Samira I.,
Aglan Mona S.,
Afifi Hanan H.,
Temtamy Samia A.,
Matsumoto Naomichi
Publication year - 2018
Publication title -
american journal of medical genetics part a
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.064
H-Index - 112
eISSN - 1552-4833
pISSN - 1552-4825
DOI - 10.1002/ajmg.a.40479
Subject(s) - missense mutation , medicine , genetics , intellectual disability , nonsense , biology , phenotype , gene
We report two discordant clinical and imaging features in four male patients from two unrelated families of Egyptian descent with hemizygous pathogenic variants in PQBP1. The three patients of the first family displayed the typical features underlying PQBP1 such as the long triangular face, bulbous nose, hypoplastic malar region, and micrognathia, which were subsequently confirmed using targeted sequence analysis that showed a previously reported nonsense mutation c.586C > T p.R196*. Whole exome sequencing identified a novel missense PQBP1 variant c.530G>A:p.R177H in the second family, in which the index patient presented with intellectual disability and dysmorphic facial features reminiscent of Kabuki‐like syndrome and his brain magnetic resonance imaging revealed partial agenesis of corpus callosum, mild vermis, and brainstem hypoplasia. These imaging features are distinct from the previously described with a well‐known phenotype that is already known for PQBP1. This report expands the phenotypic spectrum of PQBP1 ‐related disorders and is the second reported missense PQBP1 variant. Further, it highlights the possible role of PQBP1 in hindbrain development.