Systematic localization of common disease-associated variation in regulatory DNA

Area of Science:

• Genomics
• Epigenetics
• Human Genetics

Background:

• Genome-wide association studies (GWAS) have identified numerous noncoding genetic variants linked to common diseases and traits.
• These variants often reside in regulatory DNA regions, but their precise functional impact remains incompletely understood.

Purpose of the Study:

• To investigate the role of noncoding variants within regulatory DNA elements in common human diseases.
• To identify gene targets and pathogenic mechanisms associated with these variants.

Main Methods:

• Analysis of deoxyribonuclease I (DNase I) hypersensitive sites (DHSs) as markers of regulatory DNA.
• Integration of variant data with DHS activity, gene expression, and chromatin state information.
• Computational methods to identify distant gene targets and regulatory networks.

Main Results:

• Noncoding disease-associated variants are concentrated in DHSs, with a significant proportion active during fetal development.
• DHSs containing variants were linked to gestational exposure-related phenotypes.
• Variants were found to perturb transcription factor binding sites, alter chromatin states, and form regulatory networks.
• Tissue-specific enrichment of variants identified pathogenic cell types for Crohn's disease, multiple sclerosis, and an electrocardiogram trait.

Conclusions:

• Regulatory DNA variation plays a pervasive role in common human diseases.
• These findings provide pathogenic insights into diverse disorders by linking noncoding variants to specific cellular and developmental contexts.