Beyond GWASs: illuminating the dark road from association to function.

Area of Science:

• Genetics
• Genomics
• Bioinformatics

Background:

• Genome-wide association studies (GWASs) have identified numerous common genetic variants associated with various traits and drug responses.
• A significant challenge remains in precisely identifying the genes targeted by these GWAS associations.
• Many identified variants are located in noncoding regions, necessitating specialized approaches for functional interpretation.

Purpose of the Study:

• To review current strategies for the functional follow-up of GWAS loci.
• To highlight methods for prioritizing and verifying functional single nucleotide polymorphisms (SNPs).
• To focus on approaches for understanding the mechanisms of noncoding variants.

Main Methods:

• Fine mapping of GWAS signals to narrow down potential causal variants.
• Integration of genetic epidemiology and bioinformatics for SNP prioritization.
• In vitro and in vivo experimental validation of predicted molecular mechanisms.
• Assessment of noncoding variant effects on transcriptional regulation, noncoding RNA function, and epigenetic regulation.

Main Results:

• The majority of GWAS-identified variants are in noncoding genomic regions.
• Functional follow-up strategies are crucial for translating genetic discoveries into biological insights.
• Prioritization and experimental verification methods are advancing the identification of targeted genes.

Conclusions:

• Effective functional follow-up of GWAS loci is essential for understanding disease mechanisms and drug responses.
• Specialized strategies are needed to interpret the impact of noncoding variants.
• These integrated approaches accelerate the path from genetic association to biological understanding and potential clinical applications.