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Growth differences and dimorphic expression of growth hormone (GH) in female and male Cynoglossus semilaevis after male sexual maturation

文献类型： 外文期刊

作者： Ji, Xiang-Shan 1 ; Liu, Han-Wen 3 ; Chen, Song-Lin 1 ; Jiang, Yun-Liang 2 ; Tian, Yong-Sheng 1 ;

作者机构： 1.Chinese Acad Fisheries Sci, Yellow Sea Fisheries Res Inst, Key Lab Sustainable Utilizat Dev Marine Fisheries, Qingdao 266071, Peoples R China

2.Shandong Agr Univ, Coll Anim Sci & Technol, Tai An 271018, Shandong, Peoples R China

3.Chinese Acad Fishery Sci, Yangtze River Fisheries Res Inst, Jinzhou 434000, Peoples R China

关键词： Cynoglossus semilaevis;Growth hormone;Growth dimorphism;Precocious sexual maturation

期刊名称：MARINE GENOMICS （ 影响因子：1.71； 五年影响因子：1.969 ）

ISSN：

年卷期：

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收录情况： SCI

摘要： Half-smooth tongue sole, Cynoglossus semilaevis. is an ideal model to investigate the regulatory mechanisms of sexual growth dimorphism in fish species. The aim of the study was to investigate the effect of differential age of sexual maturity for females and males on growth and GH mRNA expression in C. semilaevis. The body weight differences between the sexes were not significant in C semilaevis at age 5 months when females and males were all immature. Significant differences in body weight between the sexes were found after early sexual maturation of males at the age of 9 months. The body weight of 21-month-old females (621.4 +/- 86.4 g). still not immature, was even 3.28 times higher than that of the males (189.7 +/- 14.4 g). The cDNAs encoding GH in C. semilaevis was cloned. The GH gene is 2924 bp long and consists of six exons and five introns. The results of qRT-PCR showed that GH mRNA levels of the immature females were not significantly different from that of immature males at age 5 months. However, GH mRNA levels of the immature females were significantly higher compared with those of the mature males at age 9 months (P<0.05). At age 11 months, GH mRNA levels of females were even 6.4-fold higher than that of males. In conclusion, for the first time we show that early sexual maturity of males is the main cause of sexual growth dimorphism in C. semilaevis and exert significant effect on GH mRNA expression.

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