The progesterone receptor (PGR) is a nuclear receptor that functions as a ligand-activated transcription factor controlling reproductive processes through progesterone signaling. Upon progesterone binding, PGR regulates gene expression via RNA polymerase II-dependent mechanisms and modulates chr11 accessibility to control endometrial and myometrial function 1. PGR protein stability is maintained through multiple regulatory pathways, including SOX4-mediated repression of E3 ubiquitin ligase-driven degradation 2, and PGR mRNA translation is enhanced by METTL3-catalyzed m6A modifications in the 5' UTR in a YTHDF1-dependent manner 3. PGR is essential for endometrial receptivity and embryo implantation, with its expression regulated by histone acetylation marks (H3K27ac) that decline with reproductive aging 4. In endometriosis, progesterone resistance develops through YAP1-mediated upregulation of miR-21-5p, which suppresses PGR expression and impairs decidualization 5. PGR deficiency in endometriotic stromal cells contributes to dysregulated differentiation, inflammation, and enhanced cell survival 6. Additionally, environmental bisphenol exposure can induce breast cancer through direct PGR binding and altered signaling 7. PGR's role extends to myometrial remodeling during pregnancy, where altered PGR occupancy patterns coordinate with transcriptomic changes supporting parturition 1.