Characterizing the dynamic and functional DNA methylation landscape in the developing human cortex

Area of Science:

• Neuroscience
• Epigenetics
• Genomics

Background:

• Epigenetic regulation via DNA methylation (DNAm) is crucial for development.
• The prenatal brain is a dynamic developmental stage with limited understanding of epigenetic variability drivers.

Purpose of the Study:

• To investigate dynamic DNA methylation across the prenatal human cortex.
• To identify genomic loci associated with epigenetic changes during prenatal brain development.
• To explore the functional relevance of these dynamic methylation sites.

Main Methods:

• Whole-genome bisulfite sequencing was employed to analyze methylation at over 39 million sites.
• Association analyses were performed between DNA methylation, gene expression, and chromatin states.
• Enrichment analyses were conducted for genes related to neuropsychiatric disorders and neurogenesis.

Main Results:

• Identified dynamic DNA methylation loci and regions in the prenatal cortex.
• Found associations between dynamic DNA methylation, nearby gene expression, and enhancer chromatin states.
• Observed enrichment of these loci for genes involved in neuropsychiatric disorders and neurogenesis.
• Detected sex-specific differences in autosomal DNA methylation with less clear functional impact.
• Confirmed dynamic methylation primarily involves CpG sites, with minimal CpH methylation.

Conclusions:

• Dynamic DNA methylation is a significant feature of prenatal brain development.
• These epigenetic changes are linked to gene regulation and critical developmental processes.
• The identified loci provide potential insights into the pathogenesis of neuropsychiatric disorders.