Cloning and expression of <i>follistatin</i> gene in half-smooth tongue sole <i>Cynoglossus semilaevis</i> during the reproduction cycle -- Journal of Oceanology and Limnology,2015,33(2):299-308

	Cite this paper:
	WEN Haishen, SI Yufeng, ZHANG Yuanqing, HE Feng, LI Jifang. Cloning and expression of follistatin gene in half-smooth tongue sole Cynoglossus semilaevis during the reproduction cycle[J]. Journal of Oceanology and Limnology, 2015, 33(2): 299-308

Cloning and expression of follistatin gene in half-smooth tongue sole Cynoglossus semilaevis during the reproduction cycle

WEN Haishen^1,2, SI Yufeng¹, ZHANG Yuanqing¹, HE Feng¹, LI Jifang¹

1 College of Fisheries, Ocean University of China, Qingdao 266003, China;
2 College of Animal Science and Technology, Inner Mongolia Nationality University, Tongliao 028000, China

Abstract:

Follistatin (FST) is a monomeric glycoprotein highly enriched in cysteines and belongs to TGF-β superfamily. FST can suppress the secretion of follicle-stimulating hormone and plays a vital role in the reproduction of vertebrates. We used rapid amplification of cDNA ends technology to clone the FST gene of half-smooth tongue sole, Cynoglossus semilaevis. We characterized its phylogenetic context and expression patterns to elucidate its function in the breeding season. The full-length sequence of FST is 1 455 bp and encodes a protein of 321 amino acids. We investigated the expression pattern of FST in C. semilaevis at different stages of reproduction using reverse transcription-polymerase chain reaction (RTPCR). FST mRNA was expressed in all 13 tissues analyzed, and was expressed at high levels in gonad and at slightly lower levels in gill and brain. During the reproductive cycle of C. semilaevis, the transcript level of FST was the highest in the perinucleolus stage, decreased in the primary yolk stage, slightly increased in the tertiary yolk stage, and then reduced to a minimal level in the atretic follicles stage of the ovary. We concluded that FST suppressed follicle-stimulating hormone, which stimulated oocyte development. However, no significant variation was observed across all stages of testis development, although the expression level in the spermatogenesis stage was relatively low, which may result from the regulation of FST by aromatase.

Key words: Cynoglossus semilaevis|follistatin (FST)|cloning|gene expression

Received: 2014-03-14 Revised: 2014-05-06

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