Gene regulatory activity associated with polycystic ovary syndrome revealed DENND1A-dependent testosterone production.

Summary

Using high-throughput reporter assays, CRISPR-based epigenome editing, and genetic association, the authors fine-mapped regulatory elements at PCOS loci (GATA4, FSHB, DENND1A). Perturbation that increased endogenous DENND1A expression elevated testosterone in an adrenal cell model, linking disease-associated regulatory variation to a core PCOS endophenotype.

Key Findings

• High-throughput reporter assays and CRISPR epigenome editing identified functional regulatory elements at GATA4, FSHB, and DENND1A PCOS loci.
• Increasing endogenous DENND1A expression in an adrenal cell model elevated testosterone, linking regulatory perturbation to hyperandrogenism.
• Genetic association and fine mapping supported causal noncoding variants driving PCOS risk through gene regulation.

Clinical Implications

Improved identification of causal regulatory elements may enable genetic risk stratification and inform development of targeted therapies modulating DENND1A pathways in PCOS.

Limitations

• Primary functional validation performed in an adrenal cell model rather than human ovarian/thecal tissue
• Translational impact not yet tested in vivo or in clinical cohorts

Future Directions

Validate regulatory variants in disease-relevant ovarian cell types and in vivo models; explore pharmacologic modulation of DENND1A regulatory pathways to reduce androgen excess.