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Transcriptome of Tribolium castaneum in different climatic conditions

ABSTRACT: Transcriptome of Tribolium castaneum in different climatic conditions

PROVIDER: PRJNA551950 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR9622130.fastq.gz	Fastqsanger.gz
	SRR9622140.fastq.gz	Fastqsanger.gz
	SRR9622150.fastq.gz	Fastqsanger.gz
	SRR9622160.fastq.gz	Fastqsanger.gz
	SRR9622170.fastq.gz	Fastqsanger.gz

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Transcriptome of Tribolium castaneum in different climatic conditions

Project description:We combined fitness and whole-transcriptome data of Tribolium castaneum to investigate gene expression and fitness responses to drought, heat and their combination. Fitness was reduced by both stressors and their combined effects were nearly additive. Accordingly, expression data showed that both stressors were acting mostly independently and did not interfere physiologically. Response to heat stress resulted in a much higher number of differentially expressed genes compared to drought stress. Responses to heat and heat-drought combination were similar.

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Project description:We studied plastic and evolutionary responses in gene expression of Tribolium castaneum after beetles’ exposure to new environments that differed from ancestral control conditions in temperature, humidity or both. Using experimental evolution with ten replicated lines per condition, we were able to demonstrate adaptation (higher offspring number compared to control lines) after 20 generations. We measured whole-transcriptome gene expression with RNA-seq to infer evolutionary and plastic changes. We found more evidence for changes in mean expression (shift in the intercept of reaction norms) in adapted lines than for changes in plasticity (shifts in slopes). Plasticity was mainly preserved in selected lines and was responsible for a large part of the phenotypic divergence in expression between ancestral and new conditions. However, we found that genes with the largest evolutionary changes in expression also evolved reduced plasticity and often showed expression levels closer to the ancestral stage. Results obtained in the three different conditions were similar, suggesting that restoration of ancestral expression levels during adaptation is a general evolutionary pattern. With a larger sample in the most stressful condition, we were able to detect a positive correlation between proportion of genes with reversion of the ancestral plastic response and mean fitness per selection line.

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Identification of maternally-loaded RNA transcripts in unfertilized eggs of Tribolium castaneum

Project description:Using a tiled whole-genome microarray, we found that 58.2% of Tribolium castaneum genes are maternally loaded into eggs. Comparison of known Drosophila melanogaster maternal genes to our results showed widespread conservation of maternal function with T. castaneum. We also found many T. castaneum genes with previously identified gender or tissue specific expression were also maternally loaded into eggs. The microarray design also allowed the detection of 2315 and 4060 novel transcriptionally active regions greater in length than 100 bp in unfertilized and fertilized T. castaneum eggs, respectively. The primary objective of this study was to identify expressed regions of the Tribolium castaneum genome in unfertilized and fertilized eggs using a whole-genome tiled microarray. The whole RNA of 3 samples of virgin laid eggs and 3 samples of fertilized eggs were compaired.

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