ZFIN ID: ZDB-PUB-080922-2
Cloning and functional analysis of the proximal promoter region of the three GnRH genes from the silver sea bream (Sparus sarba)
Hu, S.Y., Chen, M.H., Lin, Y.C., Lin, G.H., Gong, H.Y., and Wu, J.L.
Date: 2008
Source: Comparative biochemistry and physiology. Part B, Biochemistry & molecular biology   151(4): 373-380 (Journal)
Registered Authors: Chen, Mark Hung-Chih, Gong, Hong-Yi, Lin, Gen-Hwa, Wu, Jen-Leih
Keywords: gonadotropin-releasing hormone, promoter analysis, silver sea bream
MeSH Terms:
  • Animals
  • Brain Chemistry*
  • Cloning, Molecular
  • Conserved Sequence
  • Gonadotropin-Releasing Hormone/genetics*
  • Mesencephalon
  • Olfactory Bulb
  • Preoptic Area
  • Promoter Regions, Genetic/genetics*
  • Prosencephalon
  • Protein Isoforms
  • Sea Bream
PubMed: 18790071 Full text @ Comp. Biochem. Physiol. B Biochem. Mol. Biol.
Gonadotropin-releasing hormone (GnRH) is a neuropeptide that plays a major role in releasing pituitary gonadotropin and controlling vertebrate reproduction. In this study, three GnRH cDNAs, GnRH-I (sbGnRH; 348 bp), GnRH-II (cGnRH-II; 557 bp), and GnRH-III (sGnRH; 483 bp), were cloned from the brain of the silver sea bream (Sparus sarba). In order to understand how the expression of the GnRH isoforms was regulated in the brain, the promoter of each gene was cloned and analyzed. We found regulatory motifs in the promoters that were conserved in the GnRH promoters of tilapia and zebrafish, suggesting that these motifs play a critical role in GnRH regulation. We performed functional analyses and examined tissue-specific expression for each GnRH promoter using EGFP reporter fusions in zebrafish. The GnRH-I promoter was active in the forebrain area, including the olfactory bulb-terminal nerve area and peripheral preoptic areas; the GnRH-II promoter was active in the midbrain; and the GnRH-III promoter was active in the olfactory bulb. These results show that the GnRH promoters of the silver sea bream GnRH genes exhibit tissue-specific activity.