The function of ENSG00000234776 (FREY1, Frey regulator of sperm-oocyte fusion 1) is as follows. Key regulator for male fertility expressed transiently in round spermatids where it recruits IZUMO1 at the endoplasmic reticulum (ER) membrane and coordinates the oolemmal binding multimeric complex (IZUMO1 complex) assembly. Upon complete assembly of the IZUMO1 complex, its ER retention is released, facilitating IZUMO1 complex export to the acrosome. Through the interaction with SPPL2C, inhibits its intramembrane protease activity directly accessing the catalytic center of an I-CLiP. .