Molecular characterization, sexually dimorphic expression, and functional analysis of 3'-untranslated region of vasa gene in half-smooth tongue sole (Cynoglossus semilaevis)

文献类型： 外文期刊

第一作者： Huang, Jinqiang

作者： Huang, Jinqiang;Huang, Jinqiang;Lin, Fan

作者机构：

关键词： Vasa;Flatfish;Primordial germ cells;Sex differentiation;Gonadal development

期刊名称：THERIOGENOLOGY （ 影响因子：2.74； 五年影响因子：2.93 ）

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收录情况： SCI

摘要： Vasa is a highly conserved ATP-dependent RNA helicase expressed mainly in germ cells. The vasa gene plays a crucial role in the development of germ cell lineage and has become an excellent molecular marker in identifying germ cells in teleosts. However, little is known about the structure and function of the vasa gene in flatfish. In this study, the vasa gene (Csvasa) was isolated and characterized in half-smooth tongue sole (Cynoglossus semilaevis), an economically important flatfish in China. In the obtained 6425-bp genomic sequence, 23 exons and 22 introns were identified. The Csvasa gene encodes a 663-amino acid protein, including highly conserved domains of the DEAD-box protein family. The amino acid sequence also shared a high homology with other teleosts. Csvasa expression was mainly restricted to the gonads, with little or no expression in other tissues. Real-time quantitative polymerase chain reaction analysis revealed that Csvasa expression levels decreased during embryonic and early developmental stages and increased with the primordial germ cell proliferation. A typical sexually dimorphic expression pattern of Csvasa was observed during early development and sex differentiation, suggesting that the Csvasa gene might play a differential role in the proliferation and differentiation of male and female primordial germ cells (PGCs). Csvasa mRNA expression levels in neomales were significantly lower than those in normal males and females, indicating that the Csvasa gene might be implicated in germ cell development after sex reversal by temperature treatment. In addition, medaka (Oryzias latipes) PGCs could be transiently labeled by microinjection of synthesized mRNA containing the green fluorescence protein gene and 3'-untranslated region of Csvasa, which confirmed that the Csvasa gene has the potential to be used as a visual molecular marker of germ cells and laid a foundation for manipulation of PGCs in tongue sole reproduction.

分类号： Q95

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