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Morphology, sex steroid level and gene expression analysis in gonadal sex reversal of triploid female (XXX) rainbow trout (Oncorhynchus mykiss)

文献类型： 外文期刊

作者： Xu, Gefeng 1 ; Huang, Tianqing 1 ; Jin, Xian 2 ; Cui, Cunhe 2 ; Li, Depeng 2 ; Sun, Cong 2 ; Han, Ying 1 ; Mu, Zhenbo 3 ;

作者机构： 1.Northeast Agr Univ, Dept Anim Sci & Technol, Harbin, Heilongjiang, Peoples R China

2.Harbin Acad Agr Sci, Harbin, Peoples R China

3.Chinese Acad Fishery Sci, Heilongjiang Fisheries Res Inst, Natl & Local Joint Engn Lab Freshwater Fish Breed, Harbin, Peoples R China

关键词： Rainbow trout;Sex reversal;Triploid;Sex steroid;Gene expression

期刊名称：FISH PHYSIOLOGY AND BIOCHEMISTRY （ 影响因子：2.794； 五年影响因子：2.876 ）

ISSN：

年卷期：

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收录情况： SCI

摘要： In non-mammalian vertebrates, estrogens and expressions of cyp19a1 and foxl2 play critical roles in maintaining ovary differentiation and development, while dmrt1 and sox9 are male-specific genes in testicular differentiation and are highly conserved. In order to deeply understand the morphological change, sex steroids level and molecular mechanism of triploid female gonadal reversal in rainbow trout, we studied the ovary morphology, tendency of estradiol-17 beta (E2) and testosterone (T) levels and the relative expressions of dmrt1, cyp19a1, sox9 and foxl2 in juvenile and adult fish. Our results demonstrated that the development of triploid female gonads in rainbow trout went through arrested development, oocytes dedifferentiation, ovary reconstruction and sex reversal finally. During early gonadal development (154-334 days post-fertilization), the expressions of foxl2 and cyp19a1 increased linearly, while expressions of dmrt1 and sox9 were extremely suppressed, and E2 level was higher, while T level was lower. During the mid-to-late period of triploid female gonadal development (574-964 days post-fertilization), the expressions of dmrt1 and sox9 remained high and were very close to the quantity of diploid male genes, and T levels were even reaching diploid male plasma concentrations, while expressions of cyp19a1 and foxl2 were decreased, leading to decrease in E2 level. We realized that the development model of rainbow trout triploid female gonads was extremely rare, and the regulatory mechanism was very special. Genes involved in gonadal development and endogenous estrogens are pivotal factors in fish natural sex reversal.

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