NUP214 deficiency causes severe encephalopathy and microcephaly in humans

Hanan E Shamseldin 1, Nawal Makhseed 2, Niema Ibrahim 1, Tarfa Al-Sheddi 1, Eman Alobeid 1, Firdous Abdulwahab 1, Fowzan S Alkuraya 3 4

Affiliations

01 March 2019

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doi: 10.1007/s00439-019-01979-w

Abstract

Nuclear pore complex (NPC) is a fundamental component of the nuclear envelope and is key to the nucleocytoplasmic transport. Mutations in several NUP genes that encode individual components of NPC known as nucleoporins have been identified in recent years among patients with static encephalopathies characterized by developmental delay and microcephaly. We describe a multiplex consanguineous family in which four affected members presented with severe neonatal hypotonia, profound global developmental delay, progressive microcephaly and early death. Autozygome and linkage analysis revealed that this phenotype is linked to a founder disease haplotype (chr9:127,113,732-135,288,807) in which whole exome sequencing revealed the presence of a novel homozygous missense variant in NUP214. Functional analysis of patient-derived fibroblasts recapitulated the dysmorphic phenotype of nuclei that was previously described in NUP214 knockdown cells. In addition, the typical rim staining of NUP214 is largely displaced, further supporting the deleterious effect of the variant. Our data expand the list of NUP genes that are mutated in encephalopathy disorders in humans.

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