Luteinizing Hormone beta subunit (LH-β) is a critical glycoprotein hormone chain that confers functional specificity to the intact LH hormone. While it non-covalently associates with the common alpha subunit (shared with other pituitary hormones like FSH and TSH), the unique beta subunit is responsible for dictating receptor binding specificity. The binding of LH to its receptor in the gonads is primarily mediated by the beta subunit, triggering signaling cascades essential for reproductive physiology. In females, this stimulates ovulation and progesterone production, and in males, it drives testosterone synthesis in Leydig cells. Therefore, the expression and structural integrity of the LH-β gene are indispensable for the regulation of steroidogenesis and gametogenesis, making it a cornerstone of the hypothalamic-pituitary-gonadal axis.