A network of steroid receptor transcription factors regulates ovarian chromatin remodeling in the transition to ovulation.

Steroid receptor interactions in the mouse ovary regulate chromatin remodeling, with PGR and GR binding to novel sites to activate ovulation-related genes.

• Why it matters: Understanding how conserved steroid receptors achieve distinct roles within the same tissue is crucial for elucidating mechanisms of ovulation regulation and fertility.
• What they did: The study analyzed the dynamic association of steroid receptor cistromes and generated chromatin conformation maps in mouse ovaries, focusing on hormone-driven changes during ovulation.
• The result: Findings reveal that PGR and GR cooperate to access previously inaccessible promoters, increasing chromatin accessibility and gene activation, which collectively reprogram granulosa cell genome function for ovulation.