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Genomics analysis of hexanoic acid exposure in Drosophila species

ABSTRACT: Genomics analysis of hexanoic acid exposure in Drosophila species

PROVIDER: PRJNA767871 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR16153100.fastq.gz	Fastqsanger.gz
	SRR16153101.fastq.gz	Fastqsanger.gz
	SRR16153102.fastq.gz	Fastqsanger.gz
	SRR16153103.fastq.gz	Fastqsanger.gz
	SRR16153104.fastq.gz	Fastqsanger.gz

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Genomics analysis of hexanoic acid exposure in Drosophila species

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Project description:Drosophila sechellia is a dietary specialist endemic to the Seychelles islands that has evolved to consume the fruit of Morinda citrifolia. When ripe, the fruit of M. citrifolia contains octanoic acid and hexanoic acid, two medium-chain fatty acid volatiles that deter and are toxic to generalist insects. Drosophila sechellia has evolved resistance to these volatiles allowing it to feed almost exclusively on this host plant. The genetic basis of octanoic acid resistance has been the focus of multiple recent studies, but the mechanisms that govern hexanoic acid resistance in D. sechellia remain unknown. To understand how D. sechellia has evolved to specialize on M. citrifolia fruit and avoid the toxic effects of hexanoic acid, we exposed adult D. sechellia, D. melanogaster and D. simulans to hexanoic acid and performed RNA sequencing comparing their transcriptional responses to identify D. sechellia specific responses. Our analysis identified many more genes responding transcriptionally to hexanoic acid in the susceptible generalist species than in the specialist D. sechellia. Interrogation of the sets of differentially expressed genes showed that generalists regulated the expression of many genes involved in metabolism and detoxification whereas the specialist primarily downregulated genes involved in the innate immunity. Using these data, we have identified interesting candidate genes that may be critically important in aspects of adaptation to their food source that contains high concentrations of HA. Understanding how gene expression evolves during dietary specialization is crucial for our understanding of how ecological communities are built and how evolution shapes trophic interactions.

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Genomics analysis of L-DOPA exposure in Drosophila sechellia

Project description:The dietary specialist fruit fly Drosophila sechellia evolved to feed primarily on the toxic fruit of Morinda citrifolia. Seeking the basis of adaptations to the unique chemistry of its host plant, we profiled genome-wide gene expression response to L-DOPA because it is highly abundant in M. citrifolia, critical for reproductive success of D. sechellia, and may influence toxin resistance in this species. Here we used a combination of functional genetics and genomics to identify a new gene, Esterase 6 (Est6) that is important for D. sechellia ecological adaptation to this new niche.

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