Transcriptional regulation of the membrane progestin receptor α gene PAQR7 underlying progesterone responsiveness in sperm storage tubules of Japanese quail.
In birds, sperm storage tubules (SSTs) located at the uterovaginal junction (UVJ) facilitate long-term sperm storage and regulate sperm release in coordination with ovulation. In Japanese quail (Coturnix japonica), sperm release from SSTs might be mediated by membrane progestin receptor α (mPRα), encoded by the progest...