Oviductins belong to a family of glycoproteins that have been suggested to play several roles during the early processes of reproduction. OVGP1 is a large carbohydrate-rich, epithelial glycoprotein with numerous O-glycosylation sites within threonine, serine, and proline-rich tandem repeats. The protein is secreted from non-ciliated oviductal epithelial cells and associates with ovulated oocytes, blastomeres, and spermatozoan acrosomal regions. At least two isoforms of OVGP are known to exist.
CHIT5, EGP, MUC9, OGP; Estrogen-dependent oviduct protein; mucin 9; Mucin-9; oviduct glycoprotein; Oviduct-specific glycoprotein; Oviductal glycoprotein; oviductal glycoprotein 1, 120kDa; Oviductin