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Oreochromis niloticus

ABSTRACT: Comparison of low temperature transcriptomes between tilapia and zebrafish

PROVIDER: PRJNA268919 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR1685920_1.fastq.gz	Fastqsanger.gz
	SRR1685920_2.fastq.gz	Fastqsanger.gz
	SRR1685930_1.fastq.gz	Fastqsanger.gz
	SRR1685930_2.fastq.gz	Fastqsanger.gz
	SRR1685921_1.fastq.gz	Fastqsanger.gz

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Project description:Transcriptional plasticity is a major driver of phenotypic differences between species. The lower temperature limit (LTL), namely the lower end of survival temperature, is an important trait delimiting the geographical distribution of a species, however, the genetic mechanisms are poorly understood. We investigated the inter-species transcriptional diversification in cold responses between zebrafish Danio rerio and tilapia Oreochromis niloticus, which were reared at a common temperature (28Â°C) but have distinct LTLs. We identified significant expressional divergence between the two species in the orthologous genes from gills when the temperature cooled to the LTL of tilapia (8Â°C). Five KEGG pathways were found sequentially over-represented in the zebrafish/tilapia divergently expressed genes in the duration (12 hour) of 8Â°C exposure, forming a signaling cascade from metabolic regulation to apoptosis via FoxO signaling. Consistently, we found differential progression of apoptosis in the gills of the two species in which zebrafish manifested a delayed and milder apoptotic phenotype than tilapia, corresponding with a lower LTL of zebrafish. We identified diverged expression in 25 apoptosis-related transcription factors between the two species which forms an interacting network with diverged factors involving the FoxO signaling and metabolic regulation. We propose a genetic network which regulates LTL in fishes.Â Examination of gene expressional divergence in gill between zebrafish and tilapia

2016-07-03 | E-GEOD-69965 | biostudies-arrayexpress

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Project description:Integrated analysis of miRNA and mRNA expression profiles in genetically improved farmed tilapia (GIFT, Oreochromis niloticus) liver exposed to high temperature stress

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Project description:Commercial production of tilapia relies on monosex cultures of males, which so far proved difficult to maintain in large scale production facilities. Thus, a better understanding of the genetic architecture of the complex trait of sex determination in tilapia is needed.We aimed to detect genes that were differentially expressed by gender at early embryonic development. Artificial fertilization of O. niloticus females with either sex-reversed males (ΔXX) or genetically-modified YY 'supermales' resulted in all-female and all-male embryos, respectively. Pools of all-female and all-male embryos at 2, 5 and 9 days post fertilization were used for custom Agilent eArray. 56 pool samples of Nile tilapia full siblings groups (female or male) at day 2, 5 or 9 post fertilization were subjected to total RNA extraction from whole embryo tissues and hybridized to the custom Agilent array. Each sample was yielded from different cross of artificial fertilization: six dams X five sires. The resulting gender were known based on the sire, sex-reversed males (ΔXX) or genetically-modified YY 'supermales' resulted in all-female and all-male embryos, respectively.

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