Defective ventral neurogenesis due to midfetal Chd8 mutation drives autistic-like behavior in mice.

Scientists studied mice with a genetic change similar to one found in some autistic people. They discovered that this genetic change affects brain development during pregnancy, specifically around the middle of pregnancy. When brain cells in certain areas developed incorrectly during this time, the mice later showed autism-like behaviors such as social difficulties and anxiety. The researchers could fix these problems by correcting the genetic issue in the affected brain cells.

This mouse study investigated how mutations in the CHD8 gene contribute to autism-like behaviors by examining the timing and location of developmental disruptions. Researchers found that CHD8 mutations occurring at embryonic day 14.5 (mid-fetal period) led to autism-like behaviors including abnormal social interaction and increased anxiety. The mutation specifically affected ventral progenitor cells in the developing brain, causing accelerated cell division and differentiation. Importantly, restoring CHD8 expression in these specific brain cells reversed both the behavioral abnormalities and the underlying brain development issues.

This provides evidence that CHD8-related autism may stem from disrupted brain development during a critical mid-fetal period in specific brain regions.

This research advances understanding of how CHD8 mutations cause autism by identifying critical developmental windows and specific brain cell types involved. While promising for future therapeutic development, these mouse findings require validation in human studies before clinical applications can be considered.

This is a mouse study and findings may not directly translate to humans. Sample size not reported. The study focuses specifically on CHD8 mutations and may not apply to other genetic causes of autism. Long-term effects of the intervention were not described.

Autism spectrum disorder (ASD) is a common neurodevelopmental condition characterized by behavioral abnormalities. Although mouse models have been widely adopted to recapitulate the pathology of ASD, the identification of specific neural abnormalities responsible for autistic-like behavior has remained challenging. Here we provide insight into this causal relation by identifying the critical period and cell type responsible for the development of such behavior in ASD model mice with a Chd8 mutation. We find that Chd8 mutation induced at embryonic day 14.5 gives rise to ASD-like behavioral phenotypes, including abnormal social interaction and increased anxiety-like behavior, as well as to accelerated cell-cycle exit and differentiation in ventral progenitor cells.

Restoration of Chd8 expression in ventral progenitor cells ameliorates both the behavioral phenotypes and aberrant ventral differentiation in Chd8 mutant mice. Our findings indicate that Chd8 mutation during the midfetal period-in particular, in ventral progenitor cells-contributes to the development of autistic-like behavior.