Abstract
In fish breeding practices, gamete maturity of females is vital to reproductive success. For some species, it is possible to estimate the female maturation status based on abdomen observation, but quite difficult for some species which mature at big size. To screen out the potential biomarker in fish blood relating to female maturation, we employed the approach integrating the UPLC-MS/MS and RNA-seq techniques to investigate the metabolites and genes reflecting the sexual maturation and spawning of female blunt snout bream Megalobrama amblycephala. The study included four groups, 1-year-old immature female individuals, 2-year-old immature female individuals, 2-year-old sexually mature female individuals, and 2-year-old sexually mature female individuals after 24 h of successful spawning. The upregulated metabolites in mature females were involved in “steroid hormone biosynthesis,” “metabolic pathways,” “glycerophospholipid metabolism,” etc. compared with those of immature individuals. As the key intermediate of steroid hormone biosynthesis, 17α-hydroxypregnenolone exhibited the highest level in 2-year-old mature females than in the immature females. Meanwhile, the metabolites (i.e., dodecanoic acid and myristic acid) participating in fatty acid synthesis exhibited much lower levels in the females after spawning than those before spawning. In addition to the metabolites, the genes involved in ovarian steroidogenesis were significantly upregulated in the 2-year-old immature females compared to the 1-year-old immature females, indicating that the ovarian steroidogenesis plays important roles in ovarian development of M. amblycephala at the early stages. The significant upregulation of genes (i.e., itpr1, camk2, and mekk2) involved in the “GnRH signaling pathway” was observed in the mature females compared with the immature females, which indicated that the estrogen levels increased after female maturation in M. amblycephala. Moreover, many genes (e.g., gck, creb1, tf2-9, ryr2, asgr1, and creb1) regulating insulin secretion and thyroid hormone synthesis were significantly downregulated after female spawning. The dynamics of gene expression and metabolites observed in this study provide novel cues for guiding fish practical artificial reproduction.
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Data Availability
The raw data of metabolites was deposited at EMBL-EBI MetaboLights under accession number MTBLS1020. Gene expression profiles were deposited at the Gene Expression Omnibus database (GEO) under accession number GSE131093. The raw data of RNA-Seq used as reference was deposited at the NCBI Sequence Read Archive (SRA) (NCBI Sequence Read Archive SRX5824305).
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Funding
This work was financially supported by the National Natural Science Foundation of China (Grant No. 31872559), National Key Research and Development Program (Grant No. 2018YFD0900205), Modern Agriculture Industry Technology System Construction Projects of China titled as-Staple Freshwater Fishes Industry Technology System (Grant No. CARS-46-08), and Fundamental Research Funds for the Central Universities (Grant No. 2662018PY035).
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Yi, S., Liu, LF., Zhou, LF. et al. Screening of Biomarkers Related to Ovarian Maturation and Spawning in Blunt Snout Bream (Megalobrama amblycephala) Based on Metabolomics and Transcriptomics. Mar Biotechnol 22, 180–193 (2020). https://doi.org/10.1007/s10126-019-09943-5
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DOI: https://doi.org/10.1007/s10126-019-09943-5