Abstract
Lateolabrax japonicus is an abundant marine aquatic fish species that is commonly cultured in East Asia due to its high commercial value. In this study, RNA-Seq analysis of L. japonicus was carried out to identify reproduction- and growth-related genes expressed in L. japonicus ovaries at different ages using Illumina sequencing technology. In total, 334,388,688 high-quality reads were obtained in four libraries, i.e., 4-year-old ovaries (4th_Ovary), 3-year-old ovaries (3rd_Ovary), 2-year-old ovaries (2nd_Ovary), and 1-year-old ovaries (1st_Ovary). The reads were then de novo assembled into 101,860 unigenes with an average unigene length of 879 bp. In total, 30,142 unigenes (29.59%) were annotated in public databases, including Nr database (Nr), Swiss-Prot, Kyoto Encyclopedia of Genes and Genomes (KEGG), and Cluster of Orthologous Groups of proteins (COG), based on sequence similarity. Comparative analysis revealed that there were 35,749, 43,657, and 36,819 differentially expressed genes (DEGs) in three comparisons (4th_Ovary versus 3rd_Ovary, 4th_Ovary versus 2rd_Ovary, and 4th_Ovary versus 1st_Ovary, respectively). In total, 24,295 DEGs were different expressed in 4th_Ovary. Enrichment and pathway analyses of the DEGs were also carried out to excavate the candidate genes related to reproduction and growth, and 402 genes that potential involved in the regulation of reproduction and growth were identified, e.g., GnRHR (GnRH receptor), GHR 2 (growth hormone receptor 2), I_LGF1R (insulin-like growth factor 1 receptor), etc. Our findings expanded the genomic resources of L. japonicus and provided fundamental information for further studies.
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Acknowledgements
This work was supported by The Central Public-Interest Scientific Institution Basal Research Fund, South China Sea Fisheries Research Institute, CAFS (2017YB03, 2017YB28 and 2018ZD01); the Natural Science Foundation of China (3180228), the Natural Science Foundation of Guangdong Province, China (c18140500000602).
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LHQ initiated the project. CZ performed bioinformatics analyses, designed experiments, carried out experiments, analyzed the data and interpreted results and wrote the manuscript. PFW reviewed the manuscript.
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11033_2018_4383_MOESM2_ESM.xlsx
Additional File 2. The functional classification of the COG classes for the transcriptome of Lateolabrax japonicus. (XLSX 122 KB)
11033_2018_4383_MOESM3_ESM.xlsx
Additional File 3. The functional classification of the GO classes for the transcriptome of Lateolabrax japonicus. (XLSX 309 KB)
11033_2018_4383_MOESM5_ESM.xlsx
Additional File 5. Differentially expressed genes in 4th_Ovary versus 3rd_Ovary, 4th_Ovary versus 2rd_Ovary, and 4th_Ovary versus 1st_Ovary (FDR ≤ 0.001 AND |log2 ratio| ≥ 1). (XLSX 14929 KB)
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Zhao, C., Wang, P. & Qiu, L. RNA-Seq-based transcriptome analysis of reproduction- and growth-related genes in Lateolabrax japonicus ovaries at four different ages. Mol Biol Rep 45, 2213–2225 (2018). https://doi.org/10.1007/s11033-018-4383-5
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DOI: https://doi.org/10.1007/s11033-018-4383-5