Abstract
The availability of sexually mature fish often dictates the success of its captive breeding. In this study, we induced reproductive development in juvenile protogynous tiger grouper through oral administration of a plasmid (p) containing an engineered follicle-stimulating hormone (FSH). An expression construct (pcDNA3.1) was designed to express a single-chain FSH consisting of giant grouper FSH β-subunit and glycoprotein subunit-α (CGα), linked by the carboxy-terminal peptide (CTP) sequence from the human chorionic gonadotropin (hCG). Single oral delivery of pFSH encapsulated in liposome and chitosan to tiger grouper yielded a significant increase in plasma FSH protein level after 4 days. Weekly pFSH feeding of juvenile tiger groupers for 8 weeks stimulated ovarian development as indicated by a significant increase in oocyte diameter and progression of oocytes to cortical alveolar stage. As the pFSH treatment progressed from 20 to 38 weeks, female to male sex change was initiated, characterized by oocyte regression, proliferation of spermatogonial cells, and occurrence of spermatogenic cysts. It was also associated with significantly lower mRNA expression of steroidogenic genes (cyp11b, cyp19a1a, and foxl2) and basal plasma levels of sex steroid hormones 17β-estradiol (E2), testosterone (T), and 11-ketotestosterone (11KT). Results suggest that pFSH stimulates ovarian development up to cortical alveolar stage and then initiates sex change in tiger grouper. These findings significantly contribute to our knowledge on the role of FSH in the development of protogynous hermaphroditic fish. This study is the first to demonstrate induction of reproductive development in fish through oral delivery of plasmid gonadotropin.
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Acknowledgments
The authors acknowledge Dr. Ido Bar and Dr. Kelli Anderson for their help during the bioinformatics analysis; Ms. Haydee Rose Dumaran and Ms. Gregoria Erazo-Pagador for assistance on standard histological processing; and Mr. Armando Gamuza, Mr. Joel Jimenez, and Mr. Robert Fuentes for the technical assistance and fish husbandry.
Funding
This research was supported by the Australian Centre for International Agricultural Research through Project No. FIS/2012/101 granted to Prof. A. Elizur (SEAFDEC/AQD Study code 6149-T-RD-ACIAR4). Mr. P. Palma was supported by John Allwright Fellowship, an ACIAR-funded Australia Awards.
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This study was approved by the Animal Ethics Committee of the University of the Sunshine Coast (approval no. AN/A/16/102).
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Palma, P., Nocillado, J., Superio, J. et al. Induction of Gonadal Development in Protogynous Grouper with Orally Delivered FSH DNA. Mar Biotechnol 21, 697–706 (2019). https://doi.org/10.1007/s10126-019-09914-w
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DOI: https://doi.org/10.1007/s10126-019-09914-w