Identifying causal models between genetically regulated methylation patterns and gene expression in healthy colon...

Area of Science:

• Genomics
• Epigenetics
• Molecular Biology

Background:

• DNA methylation regulates gene expression and phenotypic variation.
• The interplay between genetic variation, DNA methylation, and gene expression is not fully understood.

Purpose of the Study:

• To investigate the genetic and epigenetic architecture of colocalizing molecular markers.
• To provide insights into the relationship between genetic variants, DNA methylation, and gene expression.

Main Methods:

• Analysis of methylation quantitative trait loci (mQTLs), expression quantitative trait loci (eQTLs), and expression quantitative trait methylation (eQTMs).
• Utilized linear models and Bayesian networks on colon tissue samples from 150 individuals.
• Identified interrelationships between single nucleotide polymorphisms (SNPs), CpG sites, and gene expression.

Main Results:

• Discovered 13,987 significant combinations of co-occurring associations (meQTLs) between SNPs, CpGs, and genes.
• Identified 54 non-redundant meQTLs enriched in genes related to metabolism and the immune system.
• Found that in 6% of cases, gene expression variation influenced methylation markers, challenging the canonical model.

Conclusions:

• Characterized the regulation between genetic variants, DNA methylation, and gene expression in healthy colon tissue.
• This understanding is crucial for elucidating molecular susceptibility in complex colon-related diseases.