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X‐Linked Bilateral Polymicrogyria With Epilepsy and Intellectual Disability Associated With a Novel KIF4A Variant

2024; Wiley; Linguagem: Inglês

10.1002/ajmg.a.63860

1552-4833

N Laflamme, Valérie Triassi, Laurence Martineau, Dènahin Hinnoutondji Toffa, Laurent Létourneau‐Guillon, Annie Laplante, Patrick Cossette, Éric Samarut, Martine Tétreault, Dang Khoa Nguyen,

Congenital heart defects research

ABSTRACT We studied three brothers and a maternal half‐brother featuring global developmental delay, mild to moderate intellectual disability, epilepsy, microcephaly, and strabismus. All had bilateral perisylvian and perirolandic polymicrogyria, while some also had malformations of the hippocampus (malrotation and dysplasia), cerebellum (heterotopias and asymmetric aplasia), corpus callosum dysgenesis, and brainstem asymmetric dysplasia. Exome sequencing showed that all four patients had a novel variant (c.1597C>T:p.Leu533Phe) on the KIF4A gene on chromosome X. We discuss how this variant is possibly pathogenic and could explain the reported phenotype.