Project description:Dissolved oxygen (DO) in cultured water is one of the important environment factor in fish farming. Hypoxic environment affects fish growth, metabolism and immune system. Multi-omics integrative analysis helps to uncover the underlying molecular mechanisms. In this study, the 96h median lethal hypoxia (96h-LH50) for Genetically Improved Farmed Tilapia (GIFT, Oreochromis niloticus) was first analyzed by linear interpolation. We built control (5mg/l) and hypoxic stress (96h-LH50) groups, and extracted the liver tissues for high-throughput transcriptome and metabolome sequencing. The identification and quantification results of metabolites showed that a total of 19656 metabolites had been obtained, of which 10390 were annotated. There were 3028 differentially expressed (DE) metabolites, of which 1596 metabolites were up-regulated and 1432 metabolites were down-regulated. We obtained 2375 DE genes, of which 1201 genes were up-regulated and 1174 genes were down-regulated. We verified 8 DE genes by quantitative real-time PCR. Our finding reveals the changes in metabolites and genes expression of GIFT and facilitate the understanding of regulatory pathways under hypoxic stress, which will help reduce the damage caused by hypoxic stress during culture.
