Heterozygous loss-of-function variants in DOCK4 cause neurodevelopmental delay and microcephaly

Charlotte Herbst, Viktoria Bothe, Meret Wegler, Susanne Axer-Schaefer, Séverine Audebert-Bellanger, Jozef Gecz, Benjamin Cogne, Hagit Baris Feldman, Anselm H.C. Horn, Anna C.E. Hurst, Melissa A. Kelly, Michael C. Kruer, Alina Kurolap, Annie Laquerriere, Megan Li, Paul R. Mark, Markus Morawski, Mathilde Nizon, Tomi Pastinen, Tilman PolsterPascale Saugier-Veber, Jang SeSong, Heinrich Sticht, Jens T. Stieler, Isabelle Thifffault, Clare L. van Eyk, Pascale Marcorelles, Myriam Vezain-Mouchard, Rami Abou Jamra, Henry Oppermann*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Neurons form the basic anatomical and functional structure of the nervous system, and defects in neuronal differentiation or formation of neurites are associated with various psychiatric and neurodevelopmental disorders. Dynamic changes in the cytoskeleton are essential for this process, which is, inter alia, controlled by the dedicator of cytokinesis 4 (DOCK4) through the activation of RAC1. Here, we clinically describe 7 individuals (6 males and one female) with variants in DOCK4 and overlapping phenotype of mild to severe global developmental delay. Additional symptoms include coordination or gait abnormalities, microcephaly, nonspecific brain malformations, hypotonia and seizures. Four individuals carry missense variants (three of them detected de novo) and three individuals carry null variants (two of them maternally inherited). Molecular modeling of the heterozygous missense variants suggests that the majority of them affect the globular structure of DOCK4. In vitro functional expression studies in transfected Neuro-2A cells showed that all missense variants impaired neurite outgrowth. Furthermore, Dock4 knockout Neuro-2A cells also exhibited defects in promoting neurite outgrowth. Our results, including clinical, molecular and functional data, suggest that loss-of-function variants in DOCK4 probable cause a variable spectrum of a novel neurodevelopmental disorder with microcephaly.

Original languageEnglish
Pages (from-to)455-469
Number of pages15
JournalHuman Genetics
Volume143
Issue number3
DOIs
StatePublished - Mar 2024

Funding

FundersFunder number
Cerebral Palsy Alliance
National Health and Medical Research Council
Hospital Research Foundation
Cerebral Palsy Alliance Research Foundation

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