Breaking enhancers to gain insights into developmental defects.

Area of Science:

• Genetics and Developmental Biology
• Molecular Biology and Genomics

Background:

• Genetic studies have identified numerous risk variants for developmental diseases, but the underlying molecular mechanisms are often unknown.
• Many risk variants are non-coding and located in enhancers, crucial regulatory elements controlling gene expression during development.
• The precise impact of non-coding variants on enhancer activity and subsequent gene expression programs contributing to disease remains a significant knowledge gap.

Approach:

• This review synthesizes foundational studies on enhancers in developmental diseases.
• It examines current genomic approaches for the functional characterization of developmental enhancers and their variants at scale.
• The review highlights the cell-type and developmental-stage specificity challenges in enhancer analysis.

Key Points:

• Non-coding variants at enhancers are implicated in developmental disease risk.
• Systematic functional characterization of these variants is essential but challenging due to specificity.
• Genomic approaches are advancing the ability to study enhancers and variants at scale.

Conclusions:

• Bridging the gap between genetic risk variants and molecular/cellular phenotypes requires understanding enhancer function.
• Future systematic enhancer perturbation studies are expected to elucidate mechanisms linking non-coding variants to disease.
• Advancements in functional genomics will be key to deciphering the role of enhancers in developmental disorders.