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ABSTRACT: Transcriptome characterization of pituitary samples from wild breeders versus reproductively dysfunctional hatchery-produced greater amberjack

PROVIDER: PRJNA1055966 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR27328814_1.fastq.gz	Fastqsanger.gz
	SRR27328814_2.fastq.gz	Fastqsanger.gz
	SRR27328815_1.fastq.gz	Fastqsanger.gz
	SRR27328815_2.fastq.gz	Fastqsanger.gz
	SRR27328816_1.fastq.gz	Fastqsanger.gz

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Project description:Ambient salinity is one of the crucial abiotic factors that poses substantial impacts on fish growth, development and reproduction. Greater amberjack (Seriola dumerili) is of high economic value because, and its reproduction and survival are sensitive to water salinity. To better understand the molecular adaptive mechanism to salinity fluctuations in greater amberjack, we performed comparative transcriptome analysis for gill and kidney between the optimum salinity (30 ppt, CK) and undesired regimes (10 and 40 ppt). For the gill, the skeletal development was provoked upon either hypo- or hyper-salinity stimuli, and the development of pronephros, as well as vascular endothelial cells and cortisol-mediated mitochondria-rich cell, was activated in response to the salinity alterations in kidney. These enhancements may encourage the maintenance of the gill and kidney structures and alleviate the salinity-induced damage. Ion channels NKCC1 and CFTR and the transporters for ammonium and other substances were highly upregulated in the gills and kidney, respectively, which act important roles in the osmoregulation of greater amberjack. More important, undesirable alterations of ambient salinity were found to pose adverse impacts on the immune function of greater amberjack, which may increase the risk of pathogen infection and reduce the security and yield of aquaculture of greater amberjack. In addition, deviation from the optimum salinity condition may result in undesirable uptake and accumulation of environmental toxins in greater amberjack, which attracts further attention to the food safety. Collectively, these novel findings advance our knowledge on adaptative mechanisms to ambient salinity oscillations in greater amberjack and provide a theoretical guidance for the optimal breeding mode for the aquaculture of greater amberjack.

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Differential DNA Methylation in Somatic and Sperm cells of Hatchery versus Wild (Natural-Origin) Steelhead Trout Populations

Project description:The study was designed to investigate the impacts of hatchery spawning and rearing on steelhead trout (Oncorhynchus mykiss) versus the wild fish on a molecular level. Additionally, epigenetic differences between feeding practices that allow slow growth and fast growth hatchery trout were investigated. The sperm and RBC DNA both had a large number of DMRs when comparing the hatchery versus wild steelhead trout populations. Interestingly, the DMRs were cell type specific with negligible overlap. Slow growth compared to fast growth steelhead also had a larger number of DMRs in the RBC samples. Observations demonstrate a major epigenetic programming difference between the hatchery and wild fish populations, but negligible genetic differences. Therefore, hatchery conditions and growth rate can alter the epigenetic developmental programming of the steelhead trout, which may correlate to the phenotypic variations observed.

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