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Appears in Collections:Aquaculture Journal Articles
Peer Review Status: Refereed
Title: Characterization of the European Sea Bass (Dicentrarchus labrax) Gonadal Transcriptome During Sexual Development
Author(s): Ribas, Laia
Crespo, Berta
Sanchez-Baizan, Núria
Xavier, Daniela
Kuhl, Heiner
Rodriguez, Jose Manuel
Diaz, Noelia
Boltana, Sebastian
MacKenzie, Simon
Moran, Federico
Zanuy, Silvia
Gomez, Ana
Piferrer, Francesc
Contact Email:
Keywords: Genomics
Sex differentiation
Issue Date: Jun-2019
Citation: Ribas L, Crespo B, Sanchez-Baizan N, Xavier D, Kuhl H, Rodriguez JM, Diaz N, Boltana S, MacKenzie S, Moran F, Zanuy S, Gomez A & Piferrer F (2019) Characterization of the European Sea Bass (Dicentrarchus labrax) Gonadal Transcriptome During Sexual Development. Marine Biotechnology, 21 (3), pp. 359-373.
Abstract: The European sea bass is one of the most important cultured fish in Europe and has a marked sexual growth dimorphism in favor of females. It is a gonochoristic species with polygenic sex determination, where a combination between still undifferentiated genetic factors and environmental temperature determines sex ratios. The molecular mechanisms responsible for gonadal sex differentiation are still unknown. Here, we sampled fish during the gonadal developmental period (110 to 350 days post fertilization, dpf), and performed a comprehensive transcriptomic study by using a species-specific microarray. This analysis uncovered sex-specific gonadal transcriptomic profiles at each stage of development, identifying larger number of differentially expressed genes in ovaries when compared to testis. The expression patterns of 54 reproduction-related genes were analyzed. We found that hsd17β10 is a reliable marker of early ovarian differentiation. Further, three genes, pdgfb, snx1, and nfy, not previously related to fish sex differentiation, were tightly associated with testis development in the sea bass. Regarding signaling pathways, lysine degradation, bladder cancer, and NOD-like receptor signaling were enriched for ovarian development while eight pathways including basal transcription factors and steroid biosynthesis were enriched for testis development. Analysis of the transcription factor abundance showed an earlier increase in females than in males. Our results show that, although many players in the sex differentiation pathways are conserved among species, there are peculiarities in gene expression worth exploring. The genes identified in this study illustrate the diversity of players involved in fish sex differentiation and can become potential biomarkers for the management of sex ratios in the European sea bass and perhaps other cultured species.
DOI Link: 10.1007/s10126-019-09886-x
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