Camk2a-Cre-mediated conditional deletion of chromatin remodeler Brg1 causes perinatal hydrocephalus

Neurosci Lett. 2015 Jun 15;597:71-6. doi: 10.1016/j.neulet.2015.04.041. Epub 2015 Apr 27.

Abstract

Mammalian SWI/SNF-like BAF chromatin remodeling complexes are essential for many aspects of neural development. Mutations in the genes encoding the core subunit Brg1/SmarcA4 or other complex components cause neurodevelopmental diseases and are associated with autism. Congenital hydrocephalus is a serious brain disorder often experienced by these patients. We report a role of Brg1 in the pathogenesis of hydrocephalus disorder. We discovered an unexpected early activity of mouse Camk2a-Cre transgene, which mediates Brg1 deletion in a subset of forebrain neurons beginning in the late embryonic stage. Brg1 deletion in these neurons led to severe congenital hydrocephalus with enlargement of the lateral ventricles and attenuation of the cerebral cortex. The Brg1-deficient mice had significantly smaller subcommissural organs and narrower Sylvian aqueducts than mice that express normal levels of Brg1. Effects were non-cell autonomous and may be responsible for the development of the congenital hydrocephalus phenotype. Our study provides evidence indicating that abnormalities in Brg1 function result in defects associated with neurodevelopmental disorders and autism.

Keywords: Aqueduct; Autism; Brg1/SmarcA4; Camk2a-Cre; Hydrocephalus; SCO.

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • Animals
  • Calcium-Calmodulin-Dependent Protein Kinase Type 2 / genetics*
  • Cerebral Aqueduct / abnormalities
  • Cerebral Aqueduct / metabolism
  • Constriction, Pathologic
  • DNA Helicases / genetics*
  • DNA Helicases / metabolism
  • Hydrocephalus / congenital*
  • Hydrocephalus / metabolism
  • Hydrocephalus / pathology
  • Integrases / genetics*
  • Mice, Transgenic
  • Neurons / metabolism
  • Nuclear Proteins / genetics*
  • Nuclear Proteins / metabolism
  • Prosencephalon / abnormalities
  • Prosencephalon / metabolism
  • Subcommissural Organ / abnormalities
  • Subcommissural Organ / metabolism
  • Transcription Factors / genetics*
  • Transcription Factors / metabolism

Substances

  • Nuclear Proteins
  • Transcription Factors
  • Calcium-Calmodulin-Dependent Protein Kinase Type 2
  • Camk2a protein, mouse
  • Cre recombinase
  • Integrases
  • Smarca4 protein, mouse
  • DNA Helicases