Molecular cloning, expression analysis of insulin-like growth factor I (IGF-I) gene and IGF-I serum concentration in female and male Tongue sole (Cynoglossus semilaevis)

文献类型： 外文期刊

第一作者： Ma, Qian

作者： Ma, Qian;Liu, Shu-Fang;Zhuang, Zhi-Meng;Sun, Zhong-Zhi;Liu, Chang-Lin;Tang, Qi-Sheng;Ma, Qian;Su, Yong-Quan

作者机构：

关键词： IGF-I;MRNA expression;Sexually dimorphic growth;Tongue sole

期刊名称：COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY B-BIOCHEMISTRY & MOLECULAR BIOLOGY （ 影响因子：2.231； 五年影响因子：2.215 ）

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收录情况： SCI

摘要： Insulin-like growth factor I (IGF-I) is a polypeptide hormone that regulates growth during all stages of development in vertebrates. To examine the mechanisms of the sexual growth dimorphism in the Tongue sole (Cynoglossus semilaevis), molecular cloning, expression analysis of IGF-I gene and IGF-I serum concentration analysis were performed. As a result, the IGF-I cDNA sequence is 911 bp, which contains an open reading frame (ORF) of 564 bp encoding a protein of 187 amino acids. The sex-specific tissue expression was analyzed by using 14 tissues from females, normal males and extra-large male adults. The IGF-I mRNA was predominantly expressed in liver, and the IGF-I expression levels in females and extra-large males were 1.9 and 10.2 times as much as those in normal males, respectively. Sex differences in IGF-I mRNA expressions at early life stages were also examined by using a full-sib family of C. semilaevis, and the IGF-I mRNA was detected at all of the 27 sampling points from 10 to 410 days old. An increase in IGF-I mRNA was detected after 190 day old fish. The significantly higher levels of IGF-I mRNA in females were observed after 190 days old in comparison with males (P<. 0.01). The IGF-I concentrations in serum of mature individuals were detected by ELISA. The IGF-I level in the serum of females was approximately two times as much as that of males. Consequently, IGF-I may play an important role in the endocrine regulation of the sexually dimorphic growth of C. semilaevis.

分类号： Q5

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