Mutations in SMARCB1 and in other Coffin–Siris syndrome genes lead to various brain midline defects

Alina Filatova, Linda K. Rey, Marion B. Lechler, Jörg Schaper, Maja Hempel, Renata Posmyk, Krzysztof Szczaluba, Gijs W. E. Santen, Dagmar Wieczorek and Ulrike A. Nuber ()
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Alina Filatova: Technical University Darmstadt
Linda K. Rey: Heinrich Heine University
Marion B. Lechler: Technical University Darmstadt
Jörg Schaper: Heinrich Heine University
Maja Hempel: University Medical Center Hamburg-Eppendorf
Renata Posmyk: Medical University of Bialystok
Krzysztof Szczaluba: Medical University Warsaw
Gijs W. E. Santen: Leiden University Medical Center
Dagmar Wieczorek: Heinrich Heine University
Ulrike A. Nuber: Technical University Darmstadt

Nature Communications, 2019, vol. 10, issue 1, 1-14

Abstract: Abstract Mutations in genes encoding components of BAF (BRG1/BRM-associated factor) chromatin remodeling complexes cause neurodevelopmental disorders and tumors. The mechanisms leading to the development of these two disease entities alone or in combination remain unclear. We generated mice with a heterozygous nervous system-specific partial loss-of-function mutation in a BAF core component gene, Smarcb1. These Smarcb1 mutant mice show various brain midline abnormalities that are also found in individuals with Coffin–Siris syndrome (CSS) caused by SMARCB1, SMARCE1, and ARID1B mutations and in SMARCB1-related intellectual disability (ID) with choroid plexus hyperplasia (CPH). Analyses of the Smarcb1 mutant animals indicate that one prominent midline abnormality, corpus callosum agenesis, is due to midline glia aberrations. Our results establish a novel role of Smarcb1 in the development of the brain midline and have important clinical implications for BAF complex-related ID/neurodevelopmental disorders.

Date: 2019
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DOI: 10.1038/s41467-019-10849-y

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