Isolation of cDNAs for Gonadotropin-II of Flounder (Paralichthys olivaceus) and Its Expressions in Adult Tissues

  • Lee, Jae-Hyung (Department of Microbiology, Pukyong National University) ;
  • Nam, Soo-Wan (Department of Biotechnology and Bioengineering, Dong-Eui University) ;
  • Kim, Young-Tae (Department of Microbiology, Pukyong National University)
  • Published : 2003.10.01

Abstract

Gonadotropin (GTH) is a pituitary glycoprotein hormone that regulates gonadal development in vertebrates. In teleosts, two types of gonadotropins, GTH-I and GTH-II, are produced in the pituitary, and they comprised of common ${\alpha}$ and distinct ${\beta}$ subunits. In the present study, the cDNAs encoding GTH ${\alpha}\;and\;GTH-II{\beta}$ subunits were cloned and sequenced from flounder (Paralichthys olivaceus) pituitary cDNA library. The nucleotide sequence of the a subunit was 619 bp long, encoding 124 amino acids, and that of the $GTH-II{\beta}$ subunit was 538 bp long, encoding 145 amino acids. GTH subunits had well conserved cysteines, when aligned with other members of the glycoprotein family. The ${\beta}$ subunit of gonadotropin II ($GTH-II{\beta}$) had a different N-linked glycosylation site. RT-PCR analysis showed an increase of GTH II mRNA levels in association with gonadal development, and also showed that the mRNA expression of the ${\alpha}$ subunit was detected only in tissues from pituitary glands.

Keywords

References

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