Development and Reproduction (한국발생생물학회지:발생과생식)

The Korean Society of Developmental Biology (한국발생생물학회)
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Expression Profiles of Kiss2, GPR54 and GnRH Receptor I mRNAs in the Early Life Stage of Nile Tilapia, $Oreochromis$ $niloticus$

  • Park, Jin-Woo (Dept. of Aquatic Life Medical Sciences, Sunmoon University) ;
  • Kim, Jung-Hyun (Dept. of Aquatic Life Medical Sciences, Sunmoon University) ;
  • Jin, Ye-Hwa (Dept. of Aquatic Life Medical Sciences, Sunmoon University) ;
  • Kwon, Joon-Yeong (Dept. of Aquatic Life Medical Sciences, Sunmoon University)
  • Received : 2012.01.04
  • Accepted : 2012.01.26
  • Published : 2012.03.31
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Abstract

Kisspeptin has been implicated in the process of puberty onset in various animal groups. This peptide is encoded by a gene, Kiss1 in avian and mammalian species. Contrary to these higher vertebrates, however, fish appeared to have another gene, Kiss2 that also codes for the precursor peptide of kisspeptin. To figure out biological significance of this gene during the puberty onset in fish, the expression profile of Kiss2 gene was investigated in the brain of Nile tilapia together with genes of GPR54, GnRH receptorI (rGnRHI) and GTH subunits ($LH{\beta}$ and $FSH{\beta}$). Expression of Kiss2 mRNA significantly increased at 2 weeks post hatch (wph) and 13 wph ($P$<0.05). This increase coincided with the increases of GPR54 and rGnRH I gene expression. Detection of $LH{\beta}$ and $FSH{\beta}$ subunit gene expression was possible later than 13 wph, indicating the activation of gonadotrophs in the pituitary. Data obtained from this study strongly suggest that, in addition to Kiss1 gene, Kiss2 gene is deeply associated with the onset of puberty by the activation of hypothalamus pituitary gonadal axis in Nile tilapia.

Keywords

References

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