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AlAbdi, L.* ; Desbois, M.* ; Rusnac, D.V.* ; Sulaiman, R.A.* ; Rosenfeld, J.A.* ; Lalani, S.* ; Murdock, D.R.* ; Burrage, L.C.* ; Undiagnosed Diseases Network* ; Billie Au, P.Y.* ; Towner, S.* ; Wilson, W.G.* ; Wong, L.* ; Brunet, T. ; Strobl-Wildemann, G.* ; Burton, J.E.* ; Hoganson, G.* ; McWalter, K.* ; Begtrup, A.* ; Zarate, Y.A.* ; Christensen, E.L.* ; Opperman, K.J.* ; Giles, A.C.* ; Helaby, R.* ; Kania, A.* ; Zheng, N.* ; Grill, B.* ; Alkuraya, F.S.*

Loss-of-function variants in MYCBP2 cause neurobehavioural phenotypes and corpus callosum defects.

Brain 146, 1373-1387 (2022)
Publ. Version/Full Text Postprint DOI PMC
Open Access Gold (Paid Option)
The corpus callosum is a bundle of axon fibers that connects the two hemispheres of the brain. Neurodevelopmental disorders that feature dysgenesis of the corpus callosum as a core phenotype offer a valuable window into pathology derived from abnormal axon development. Here, we describe a cohort of eight patients with a neurodevelopmental disorder characterized by a range of deficits including corpus callosum abnormalities, developmental delay, intellectual disability, epilepsy, and autistic features. Each patient harbored a distinct de novo variant in MYCBP2, a gene encoding an atypical RING ubiquitin ligase and signaling hub with evolutionarily conserved functions in axon development. We used CRISPR/Cas9 gene editing to introduce disease-associated variants into conserved residues in the C. elegans MYCBP2 ortholog, RPM-1, and evaluated functional outcomes in vivo. Consistent with variable phenotypes in patients with MYCBP2 variants, C. elegans carrying the corresponding human mutations in rpm-1 displayed axonal and behavioral abnormalities including altered habituation. Furthermore, abnormal axonal accumulation of the autophagy marker LGG-1/LC3 occurred in variants that affect RPM-1 ubiquitin ligase activity. Functional genetic outcomes from anatomical, cell biological and behavioral readouts indicate that MYCBP2 variants are likely to result in loss of function. Collectively, our results from multiple human patients and CRISPR gene editing with an in vivo animal model support a direct link between MYCBP2 and a human neurodevelopmental spectrum disorder that we term, MYCBP2-related developmental delay with corpus callosum defects (MDCD).
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Publication type Article: Journal article
Document type Scientific Article
Corresponding Author
Keywords Mycbp2 ; Phr1 ; Corpus Callosum ; Epilepsy ; Habituation ; Neurodevelopmental Disorder; Regulates Axon Outgrowth; Neurodevelopmental Disorders; Formation Reveals; Protein; Rpm-1; Mutations; Agenesis; Ligase; Pam; Phr1
ISSN (print) / ISBN 0006-8950
e-ISSN 1460-2156
Journal Brain: A Journal of Neurology
Quellenangaben Volume: 146, Issue: 4, Pages: 1373-1387 Article Number: , Supplement: ,
Publisher Oxford University Press
Publishing Place Great Clarendon St, Oxford Ox2 6dp, England
Non-patent literature Publications
Reviewing status Peer reviewed
Institute(s) Institute of Neurogenomics (ING)