title: Comprehensive identification and profiling of Nile tilapia (Oreochromis niloticus) microRNAs response to Streptococcus agalactiae infection through high-throughput sequencing.
abstract: MicroRNAs are a kind of small non-coding RNAs that participate in various biological processes. Deregulated microRNA expression is associated with several types of diseases. Tilapia (Oreochromis niloticus) is an important commercial fish species in China. To identify miRNAs and investigate immune-related miRNAs of O. niloticus, we applied high-throughput sequencing technology to identify and analyze miRNAs from tilapia infected with Streptococcus agalactiae at a timescale of 72 h divided into six different time points. The results showed that a total of 3009 tilapia miRNAs were identified, including in 1121 miRNAs which have homologues in the currently available databases and 1878 novel miRNAs. The expression levels of 218 tilapia miRNAs were significantly altered at 6 h-72 h post-bacterial infection (pi), and these miRNAs were therefore classified as differentially expressed tilapia miRNAs. For the 1121 differentially expressed tilapia miRNAs target 41961 genes. GO and KEGG enrichment analysis revealed that some target genes of tilapia miRNAs were grouped mainly into the categories of apoptotic process, signal pathway, and immune response. This is the first report of comprehensive identification of O. niloticus miRNAs being differentially regulated in spleen in normal conditions relating to S. agalactiae infection. This work provides an opportunity for further understanding of the molecular mechanisms of miRNA regulation in O. niloticus host-pathogen interactions.
authors.affiliation: College of Fishery, Guangdong Ocean University, Guangdong Provincial Key Laboratory of Pathogenic Biology and Epidemiology for Aquatic Economic Animala, Key Laboratory of Control for Disease of Aquatic Animals of Guangdong Higher Education Insititutes, Zhanjiang, 524025, China.
authors.forename: Bei
authors.initials: B
authors.lastname: Wang
authors.affiliation: College of Fishery, Guangdong Ocean University, Guangdong Provincial Key Laboratory of Pathogenic Biology and Epidemiology for Aquatic Economic Animala, Key Laboratory of Control for Disease of Aquatic Animals of Guangdong Higher Education Insititutes, Zhanjiang, 524025, China; State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, China.
authors.forename: Zhen
authors.initials: Z
authors.lastname: Gan
authors.affiliation: College of Fishery, Guangdong Ocean University, Guangdong Provincial Key Laboratory of Pathogenic Biology and Epidemiology for Aquatic Economic Animala, Key Laboratory of Control for Disease of Aquatic Animals of Guangdong Higher Education Insititutes, Zhanjiang, 524025, China.
authors.forename: Shuanghu
authors.initials: S
authors.lastname: Cai
authors.affiliation: College of Fishery, Guangdong Ocean University, Guangdong Provincial Key Laboratory of Pathogenic Biology and Epidemiology for Aquatic Economic Animala, Key Laboratory of Control for Disease of Aquatic Animals of Guangdong Higher Education Insititutes, Zhanjiang, 524025, China.
authors.forename: Zhongliang
authors.initials: Z
authors.lastname: Wang
authors.affiliation: College of Fishery, Guangdong Ocean University, Guangdong Provincial Key Laboratory of Pathogenic Biology and Epidemiology for Aquatic Economic Animala, Key Laboratory of Control for Disease of Aquatic Animals of Guangdong Higher Education Insititutes, Zhanjiang, 524025, China.
authors.forename: Dapeng
authors.initials: D
authors.lastname: Yu
authors.affiliation: College of Fishery, Guangdong Ocean University, Guangdong Provincial Key Laboratory of Pathogenic Biology and Epidemiology for Aquatic Economic Animala, Key Laboratory of Control for Disease of Aquatic Animals of Guangdong Higher Education Insititutes, Zhanjiang, 524025, China.
authors.forename: Ziwei
authors.initials: Z
authors.lastname: Lin
authors.affiliation: College of Fishery, Guangdong Ocean University, Guangdong Provincial Key Laboratory of Pathogenic Biology and Epidemiology for Aquatic Economic Animala, Key Laboratory of Control for Disease of Aquatic Animals of Guangdong Higher Education Insititutes, Zhanjiang, 524025, China.
authors.forename: Yishan
authors.initials: Y
authors.lastname: Lu
authors.affiliation: College of Fishery, Guangdong Ocean University, Guangdong Provincial Key Laboratory of Pathogenic Biology and Epidemiology for Aquatic Economic Animala, Key Laboratory of Control for Disease of Aquatic Animals of Guangdong Higher Education Insititutes, Zhanjiang, 524025, China.
authors.forename: Zaohe
authors.initials: Z
authors.lastname: Wu
authors.affiliation: College of Fishery, Guangdong Ocean University, Guangdong Provincial Key Laboratory of Pathogenic Biology and Epidemiology for Aquatic Economic Animala, Key Laboratory of Control for Disease of Aquatic Animals of Guangdong Higher Education Insititutes, Zhanjiang, 524025, China. Electronic address: jianjichang@126.com.
authors.forename: Jichang
authors.initials: J
authors.lastname: Jian
mesh_terms: D000818:Animals; D023681:Cichlids; D005393:Fish Diseases / Q000276:immunology* / Q000382:microbiology; D059014:High-Throughput Nucleotide Sequencing / Q000662:veterinary; D035683:MicroRNAs / Q000235:genetics* / Q000378:metabolism; D012329:RNA, Bacterial / Q000235:genetics* / Q000378:metabolism; D017423:Sequence Analysis, RNA / Q000662:veterinary; D013290:Streptococcal Infections / Q000276:immunology / Q000382:microbiology / Q000662:veterinary*; D013292:Streptococcus agalactiae / Q000235:genetics / Q000502:physiology*
chemical_list: D035683:MicroRNAs; D012329:RNA, Bacterial
keywords: Deep sequencing; Immune response; Oreochromis niloticus; Streptococcus agalactiae; microRNA