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ABSTRACT: The gut microbiota of the wild Nile tilapia (Oreochromis niloticus) in Sri Lanka

PROVIDER: PRJNA1217125 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR32174900_1.fastq.gz	Fastqsanger.gz
	SRR32174900_2.fastq.gz	Fastqsanger.gz
	SRR32174901_1.fastq.gz	Fastqsanger.gz
	SRR32174901_2.fastq.gz	Fastqsanger.gz
	SRR32174902_1.fastq.gz	Fastqsanger.gz

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Development of gene expression signatures for the HDF and MDA-MB-231 cells that received TP4 (a cationic antimicrobial peptide) treatment

Project description:Triple-negative breast cancer (TNBC) lacks therapeutic target and is difficult to treat. We report a cationic antimicrobial peptide (CAP), tilapia piscidin 4 (TP4), derived from Nile tilapia (Oreochromis niloticus), selectively toxic to TNBC. Here we aim to identify potential target in TNBC cell response to TP4 treatment by microarray study and to further address the role of TP4-resposive genes involved in TNBC cell death.

2016-12-31 | GSE74764 | GEO

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Mapping active promoters by ChIP-seq profiling of H3K4me3 in cichlid fish - a first step to uncover cis-regulatory elements in ecological model teleosts

Project description:Evolutionary alterations to cis-regulatory sequences are likely to cause adaptive phenotypic complexity, through orchestrating changes in cellular proliferation, identity and communication. For non-model organisms with adaptive key-innovations, patterns of regulatory evolution have been predominantly limited to targeted sequence-based analyses. Chromatin-immunoprecipitation with high-throughput sequencing (ChIP-seq) is a technology that has only been used in genetic model systems and is a powerful experimental tool to screen for active cis-regulatory elements. Here, we show that it can also be used in ecological model systems and permits genome-wide functional exploration of cis-regulatory elements. As a proof of concept, we use ChIP-seq technology in adult fin tissue of the cichlid fish Oreochromis niloticus to map active promoter elements, as indicated by occupancy of trimethylated Histone H3 Lysine 4 (H3K4me3). The fact that cichlids are one of the most phenotypically diverse and species-rich families of vertebrates could make them a perfect model system for the further in-depth analysis of the evolution of transcriptional regulation. examination of H3K4me3 in adult fin tissue of the Nile tilapia (Oreochromis niloticus)

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Genome-wide microRNA screening in Nile tilapia reveals pervasive transcription of isomiRs, sex-biased arm switching and increasing complexity of expression throughout development

Project description:The elucidation of microRNA function and evolution depends on the identification and characterization of miRNA repertoire of strategic organisms, as the fast evolving cichlid fishes. Using RNA-seq and comparative genomics we carried out an in-depth report of miRNAs in Nile tilapia (Oreochromis niloticus). Our results enlarge vertebrate miRNAs collection and reveal a notable differential expression of miRNAs arms and isoforms influenced by sex and developmental life stage, providing a better picture of the evolutionary and spatiotemporal dynamics of miRNAs.

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Fecal microbiota transplantation treatment maintains post antibiotics gut function by change the gut microbiome and fecal metabolome to reduce gut inflammation and oxidative stress in nile tilapia (Oreochromis niloticus)

Project description:The imbalance of intestinal flora can affect the immune function and structural integrity of the intestinal barrier, leading to the colonization and reproduction of opportunistic pathogenic bacteria in the intestine to become the dominant flora, eventually inducing enteritis. This study aimed to investigate whether fecal microbiota transplantation (FMT) could improve the gut barrier in Nile tilapia (Oreochromis niloticus). The experiment involved administering normal saline (NS group) and fecal microbiota (FMT group) (from the negative control group (C group)) to tilapia that had been treated with oxytetracycline hydrochloride (OTC) (M group) by gavage. A total of 300 male tilapia (mean body weight 596.65 ± 47.18 g) were used, with 180 of them being fed OTC (120 mg/kg body weight/day) for 7 days to induce intestinal oxidative stress, while the rest served as the control group. After confirmation of mild chronic enteritis, the tilapia were treated in different ways.

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Project description:Elongation of very long-chain fatty acids protein 6 (Elovl6) is a crucial enzyme in the synthesis of endogenous fatty acids, which participates in the energy balance and metabolic diseases. The main objective of this study was to explore the molecular characterization of elovl6 and study regulatory mechanism of elovl6 on male Nile tilapia, Oreochromis niloticus. In the present study, the full-length cDNA of Nile tilapia elovl6 was 2255 bp, comprising a 5'-UTR of 193 bp, an ORF of 810 bp, and a 3'-UTR of 1252 bp, encoding 269 amino acids that possesses the characteristic features of Elovl proteins. The transcription expression of elovl6 transcripts showed differential expression in different tissues and fed with different lipid sources diet. Antisense RNA technology was used to knock-down elovl6 in Nile tilapia. Compared with the control treatments (transfected with ultrapure water (control) or the blank expression vector (negative control)), knockdown elovl6 altered hepatic morphology, Long chain fatty acid synthesis, fatty acid oxidation, lead to excess fat deposition in the liver, ultimately cause abnormal glucose/lipid metabolism in male Nile tilapia. Transcriptome analyses (AGPAT2 knock-down vs. negative control) revealed a total of 5877 differentially expressed genes (DEGs). Transcriptome analyses revealed DEGs were greatly involved in some signaling pathways, such as PPAR signaling pathway, fatty acid degradation, glycolysis/gluconeogenesis, and insulin signaling pathway, which were related to lipid and glucose metabolism. We used qRT-PCR to verify the mRNA expression changes of 13 DEGs in related signaling pathways. Our results demonstrate that knock-down of elovl6 in tilapia blocks the synthesis of oleic acid and leads to abnormal glucose/lipid metabolism.

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