Animal and Fish Production Department, Faculty of Agriculture (Alshatby), Alexandria University 11865, Egypt.
2College of Animal Science and Technology, Southwest University, Chongqing Key Laboratory of Forage & Herbivore, Chongqing Engineering Research Center for Herbivores Resource Protection and Utilization, Chongqing 400715 P.R. China.
Wildlife Department, Faculty of Animal Production, Gezira University, Wad Madani, Sudan.
Animal and Fish Production Department, Faculty of Agriculture (Alshatby), Alexandria University 11865, Egypt.
Animal and Fish Production Department, Faculty of Agriculture (Alshatby), Alexandria University 11865, Egypt.
This review systematically introduces basic information on the hypothalamic pituitary-gonad axis and provides knowledge on the regulation, location, function, reproduction, gene mutations, disorders, sexual behavior, life cycle, and effect of environmental factors on the gonadotropin-releasing hormone gene. On the other hand, this review focused on the GnRH gene, regulations, receptor structures, and their signaling pathways, in addition to its related genes and its effect on crucial hormones such as follicle-stimulating hormone, luteinizing hormone, testosterone, estradiol, and progesterone. Additionally, gonadotropin-inhibiting hormone and its related peptides, such as R-Famide peptides, were found to decrease hormone secretion by working on the hypothalamic pituitary gonads axis to inhibit the biosynthesis process of gonadotropin alpha and beta subunits. Additionally, the roles of crucial hormones in reproduction and fertility, as well as the disruption, resulted from mutations. Special characteristics of several hormones and pulsatile secretion of gonadotropin-releasing hormone were also summarized.
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