Journal
GENOMICS
Volume 111, Issue 3, Pages 251-259Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ygeno.2018.11.010
Keywords
Transcriptome; Diploid hybrid; Triploid hybrid; Gonadal development
Funding
- National Natural Science Foundation of China [31802274, 3157259, 31672631]
- China Agriculture Research System [CARS-47]
- Guangdong Provincial Natural Science Foundation [2017A030313109, 2018B030311026, 2018A030313890]
- Guangdong Provincial Science and Technology Program [2015A020208002, 2017B090904022]
- Special Fund for Fisheries-Scientific Research of Guangdong Province [2018-04]
- Science and Technology Planning Project of Guangzhou [201607020014, 201804020013]
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In our previous studies, diploid and triploid hybrids have been detected from the hybridization of Epinephelus coioides female x E. lanceolatus male. The triploid groupers have been found to be delayed in gonadal development, but the mechanism remains poorly understood. In this study, we examined the gonadal development, assayed the serum steroid hormone levels, and compared the BP (brain and pituitary) and G (gonad) transcriptomes of 18-month-old diploid and triploid hybrids. The results showed that levels of serum estradio1-17 beta and testosterone were significantly higher in triploid groupers. The RNA-seq data revealed that 1518 and 14,963 differentially expressed genes were identified in the BP and G transcriptome, respectively. Further analysis revealed that the expression levels of genes involved in the sexual differentiation pathway and sex steroid synthesis pathway are significantly higher in triploid hybrids. Our findings provided a comprehensive insight into a better understanding of the regulatory mechanisms of sterility in triploid hybrid fish.
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