De novo variant in KIF26B is associated with pontocerebellar hypoplasia with infantile spinal muscular atrophy

American Journal of Medical Genetics. Part a
Monica H WojcikPankaj B Agrawal

Abstract

KIF26B is a member of the kinesin superfamily with evolutionarily conserved functions in controlling aspects of embryogenesis, including the development of the nervous system, though its function is incompletely understood. We describe an infant with progressive microcephaly, pontocerebellar hypoplasia, and arthrogryposis secondary to the involvement of anterior horn cells and ventral (motor) nerves. We performed whole exome sequencing on the trio and identified a de novo KIF26B missense variant, p.Gly546Ser, in the proband. This variant alters a highly conserved amino acid residue that is part of the phosphate-binding loop motif and motor-like domain and is deemed pathogenic by several in silico methods. Functional analysis of the variant protein in cultured cells revealed a reduction in the KIF26B protein's ability to promote cell adhesion, a defect that potentially contributes to its pathogenicity. Overall, KIF26B may play a critical role in the brain development and, when mutated, cause pontocerebellar hypoplasia with arthrogryposis.

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Citations

Aug 25, 2019·American Journal of Medical Genetics. Part a·Claude StollMarie-Paule Roth
May 16, 2020·The Cerebellum·Christina T RüschEugen Boltshauser
Aug 10, 2019·Journal of Perinatology : Official Journal of the California Perinatal Association·Monica H WojcikPankaj B Agrawal
May 21, 2020·Journal of Medical Genetics·Silvia Kalantari, Isabel Filges
Oct 7, 2020·PloS One·Pierpaolo PetroneMassimo Niola
Jan 11, 2021·Sleep Medicine·Arunima RoyZachary A Kaminsky
Feb 4, 2021·The Cerebellum·Andrea AccogliMyriam Srour

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