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Genomic architecture and evolution of a seasonal reaction norm [RNA-seq]

ABSTRACT: Genomic architecture and evolution of a seasonal reaction norm [RNA-seq]

PROVIDER: PRJNA559164 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR9920680_1.fastq.gz	Fastqsanger.gz
	SRR9920680_2.fastq.gz	Fastqsanger.gz
	SRR9920681_1.fastq.gz	Fastqsanger.gz
	SRR9920681_2.fastq.gz	Fastqsanger.gz
	SRR9920682_1.fastq.gz	Fastqsanger.gz

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Project description:Here we used artificial selection to assimilate a seasonal wing color phenotype from a naturally plastic population of butterflies. Using SNP association and RNAseq we mapped three genes responsible for wing color fixation, including the color pattern supergene cortex. Combined with endocrine and chromatin accessibility assays, we found that the rapid transition of wing coloration from an environmentally determined trait to a fixed, genetic trait occurred through selection on cis-regulatory alleles of genes with wing-specific functions, not by changes in environmental detection or hormone signaling.

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Evolution of a predator-induced, nonlinear reaction norm.

Project description:Inducible, anti-predator traits are a classic example of phenotypic plasticity. Their evolutionary dynamics depend on their genetic basis, the historical pattern of predation risk that populations have experienced and current selection gradients. When populations experience predators with contrasting hunting strategies and size preferences, theory suggests contrasting micro-evolutionary responses to selection. Daphnia pulex is an ideal species to explore the micro-evolutionary response of anti-predator traits because they face heterogeneous predation regimes, sometimes experiencing only invertebrate midge predators and other times experiencing vertebrate fish and invertebrate midge predators. We explored plausible patterns of adaptive evolution of a predator-induced morphological reaction norm. We combined estimates of selection gradients that characterize the various habitats that D. pulex experiences with detail on the quantitative genetic architecture of inducible morphological defences. Our data reveal a fine scale description of daphnid defensive reaction norms, and a strong covariance between the sensitivity to cues and the maximum response to cues. By analysing the response of the reaction norm to plausible, predator-specific selection gradients, we show how in the context of this covariance, micro-evolution may be more uniform than predicted from size-selective predation theory. Our results show how covariance between the sensitivity to cues and the maximum response to cues for morphological defence can shape the evolutionary trajectory of predator-induced defences in D. pulex.

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Mechanisms of innate events during skin reaction following intradermal injection of seasonal influenza vaccine

Project description:The skin plays a crucial role in host defences against microbial attack and the innate cells must provide the immune system with sufficient information to organize these defences. This unique feature makes the skin a promising site for vaccine administration. Although cellular innate immune events during vaccination have been widely studied, initial events remain poorly understood. Our aim is to determine molecular biomarkers of skin innate reaction after intradermal (i.d.) immunization. Using an ex vivo human explant model from healthy donors, we investigated by NanoLC-MS/MS analysis and MALDI-MSI imaging, to detect innate molecular events (lipids, metabolites, proteins) few hours after i.d. administration of seasonal trivalent influenza vaccine (TIV). This multimodel approach allowed to identify early molecules differentially expressed in dermal and epidermal layers at 4 and 18 h after TIV immunization compared with control PBS. In the dermis, the most relevant network of proteins upregulated were related to cell-to-cell signaling and cell trafficking. The molecular signatures detected were associated with chemokines such as CXCL8, a chemoattractant of neutrophils. In the epidermis, the most relevant networks were associated with activation of antigen-presenting cells and related to CXCL10. Our study proposes a novel step-forward approach to identify biomarkers of skin innate reaction.

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