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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.

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