BMAL1-Mediated Circadian Regulation of Oocyte Quality and IVF Outcomes

Successful embryo development transpires far before fertilization inside the meticulously regulated microenvironment of the ovarian follicle. Increasing data indicates that circadian regulatory systems influence several processes that define oocyte competence, including mitochondrial activity, oxidative balance, meiotic development, and cellular metabolism. Brain and muscle ARNT-like protein 1 (BMAL1), an essential transcription factor in circadian regulation, has garnered significant interest due to its crucial involvement in ovarian physiology and reproductive function. Dysregulated BMAL1 signaling has been linked to compromised folliculogenesis, diminished steroidogenesis, mitochondrial dysfunction, elevated oxidative stress, and irregularities in meiotic spindle organization, all of which may negatively impact oocyte quality and early embryo development. Recent experimental and clinical findings indicate that results of assisted reproduction may be influenced by circadian disruption, sleep problems, obesity, ageing, and metabolic dysfunction.