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ABSTRACT: Intestinal 16SrRNA gene sequencing data of GIFT Tilapia

PROVIDER: PRJNA806406 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR17999932_1.fastq.gz	Fastqsanger.gz
	SRR17999932_2.fastq.gz	Fastqsanger.gz
	SRR17999933_1.fastq.gz	Fastqsanger.gz
	SRR17999933_2.fastq.gz	Fastqsanger.gz
	SRR17999934_1.fastq.gz	Fastqsanger.gz

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Project description:Genetically improved farmed tilapia (Oreochromis niloticus, GIFT) is prone to hepatic metabolic imbalance and suffer from fatty liver disease during the intensive farming. Long non-coding RNAs (lncRNAs) performed essential roles in varieties of biological processes, including lipid metabolism. However, the lncRNAs regarding hepatic lipid metabolism in tilapia have not been identified. In this study, Illumina sequencing and bioinformatic analysis was performed on the liver of male GIFT juvenile fed with high-fat diet (HFD, 18.5% lipid) or normal-fat diet (NFD, 8% lipid) for 56 days. RNA-seq analyses revealed 299 differentially expressed (DE)-mRNAs and 284 DE-lncRNAs between these two groups. The transcript expression of 16 candidates (eight DE-mRNA and eight DE-lncRNAs) was verified by qRT-PCR, and the results were consistent with those of RNA-seq. Furthermore, 65 cis targets and 3610 trans targets of DE-lncRNAs were predicted. Functional analyses suggested that multiple metabolic pathways was changed in response to high-fat intake, including PPAR signaling pathway, Fatty acid degradation and Fatty acid metabolism, among others. Co-expression networks was constructed and indicated that most lncRNAs interact with numerous mRNAs involved in lipid metabolism, and vice versa. Additionally, expression patterns analysis of three lncRNAs (MSTRG.14598.1, MSTRG.6725.3 and MSTRG.13364.2) and their potential targets (faldh, slc25a48 and fabp7a) associated with PPAR signaling pathway were investigated. Our study provides a basis for further explore the functions of lncRNAs associated with lipid metabolism in tilapia.

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Project description:Dissolved oxygen (DO) is the basis of fish survival, and proper DO level is an important condition to ensure the normal growth of fish. Hypoxic environment is prone to disturb the normal breathing and metabolism of fish, which in turn affects their growth and survival. Gill tissue is the respiratory organs of fish and is in direct contact with the external environment. However, there are few reports on the molecular regulatory mechanism of genetically improved farmed tilapia (GIFT, Oreochromis niloticus) gill tissues in response to hypoxia. Here, we first examine the hypoxia-induced damage of gill tissue by hematoxylin-eosin staining, and then constructed miRNA and mRNA libraries of GIFT gill tissue at 96h of hypoxia stress by a high-throughput sequencing technology, each library has three biological replicates. Gill lamellae of GIFT showed capillary rupture and red blood cell enlargement and overflow under hypoxia stress. Transcription sequencing results showed that the clean reads of miRNA libraries were 9,627,953-13,544,660; the clean reads of mRNA libraries were 43,817,776-53,130,102. Based on the miRNA-mRNA pairs screening principles and mRNA sequencing results, we selected and verified seven differentially expressed miRNAs and their potential target genes. The sequencing results were consistent with the qRT-PCR validation results. These selected miRNA-mRNA pairs are mainly concentrated in the signaling pathways of immune response and metabolic regulation. This study provides new insights into the mechanisms of fish adaptation under hypoxic stress.

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