Learning-dependent chromatin remodeling highlights noncoding regulatory regions linked to autism

Area of Science:

• Neuroscience
• Epigenetics
• Genetics

Background:

• Autism spectrum disorder (ASD) is a neurodevelopmental disorder with genetic links.
• Disease-associated genetic variations often occur in regulatory DNA regions controlling gene expression.
• Epigenetic mechanisms are crucial for both development and memory formation.

Purpose of the Study:

• To investigate how learning modifies chromatin accessibility in the mouse hippocampus.
• To identify regulatory regions and epigenetic changes associated with learning and memory.
• To explore the relevance of these findings to autism spectrum disorder.

Main Methods:

• Utilized a novel high-throughput sequencing bioinformatics strategy called DEScan (differential enrichment scan).
• Analyzed epigenomic data from multiple replicates to assess changes in chromatin accessibility.
• Genotyped a clinical cohort for a specific single-nucleotide polymorphism (SNP) in the SHANK3 promoter.

Main Results:

• Identified 2,365 learning-regulated regulatory regions, primarily promoters, in the mouse hippocampus.
• Found that these promoters were active during forebrain development and enriched for bivalent modifications.
• Discovered a significant association between the SNP rs6010065 in the SHANK3 promoter and ASD in a clinical cohort.

Conclusions:

• Learning recapitulates developmental epigenetic processes.
• Behaviorally induced epigenetic changes in mice can identify regulatory regions relevant to human brain disorders like ASD.
• The study highlights the role of epigenetic dysregulation in neurodevelopmental disorders.