The Gonadotropin-Inhibitory Hormone in fish.

GUSTAVO M. SOMOZA; MARÍA PAULA DI YORIO; JOSÉ A. MUÑOZ-CUETO; JOSÉ A. PAULLADA-SALMERÓN; KAZUYOSHI TSUTSUI; PAULA G. VISSIO

Ottawa

Congreso; 10th International Congress of Comparative Physiology and Biochemistry; 2019

Society for Integrative & Comparative Biology, Division of CPB

Gonadotropin-inhibitory hormone, GnIH, is named because of its function in birds and mammals; however, in other vertebrate groups this function has not yet clearly established. Our main interestare teleosts because more than half of the vertebrate species belong to this group. During teleosts evolution a 3R whole genome duplication occured, a fact that could have been responsible for thegreat phenotypic complexity and great variability in reproductive strategies and sexual behavior. In this context, we revise GnIH cell bodies and fibers distribution in adult brains of teleosts, discuss its relationship with GnRH variants and summarize the few reports available about the ontogeny of theGnIH system. Considering all the information presented in this review, we propose that in teleosts, GnIH could have other functions beyond reproduction or act as an integrative signal in the reproductive process. However, further studies are required in order to clarify the role of GnIH in this group including its involvement in development, a key stage that strongly impacts on adult life.