Screening of Biomarkers Related to Ovarian Maturation and Spawning in Blunt Snout Bream (Megalobrama amblycephala) Based on Metabolomics and Transcriptomics
Screening of Biomarkers Related to Ovarian Maturation and Spawning in Blunt Snout Bream (Megalobrama amblycephala) Based on Metabolomics and Transcriptomics
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DOI：
10.1007/s10126-019-09943-5
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发表时间：
2020-01
影响因子：
3
通讯作者：
Shaokui Yi;Li-Fang Liu;Lai-Fang Zhou;Bo-Wen Zhao;Weimin Wang;Ze‐Xia Gao
中科院分区：
文献类型：
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作者：
Shaokui Yi;Li-Fang Liu;Lai-Fang Zhou;Bo-Wen Zhao;Weimin Wang;Ze‐Xia Gao
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 breamMegalobrama 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 ofM. amblycephalaat the early stages. The significant upregulation of genes (i.e.,itpr1,camk2, andmekk2) 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 inM. amblycephala. Moreover, many genes (e.g.,gck,creb1,tf2-9,ryr2,asgr1, andcreb1) 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.
