The genetic basis for DNA methylation variation across tissues and development

Area of Science:

• Genomics
• Epigenetics
• Developmental Biology

Background:

• Mechanisms linking genetic variation to epigenome changes across development are unclear.
• Understanding how DNA methylation is programmed is crucial for deciphering gene regulation.

Purpose of the Study:

• To define a unifying developmental framework for DNA methylation programming.
• To investigate how genetic variation influences methylation patterns across cell types and species.

Main Methods:

• Genome-wide methylation and genetic variation data analysis in mice and humans.
• Whole-genome bisulfite sequencing (WGBS) on 39 human cell types.
• Mapping single nucleotide polymorphisms (SNPs) controlling allele-specific methylation.

Main Results:

• Identified thousands of differentially methylated regions (DMRs) in mice linked to transcription factor binding disruption.
• Revealed two distinct programming periods: implantation and organogenesis.
• Mapped 33,574 human regions where SNPs control allele-specific methylation, many linked to regulatory elements and disease variants.

Conclusions:

• Genetic variation influences the regulatory landscape by linking sequence, methylation, and transcription.
• Provides a cross-species atlas clarifying epigenetic programming logic and timing.
• Offers a resource for understanding non-coding variants in development and disease.