Ontology highlight
ABSTRACT:
PROVIDER: PRJNA503490 | ENA |
REPOSITORIES: ENA
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Project description:Drosophila sechellia is an island endemic host specialist that has evolved to consume the toxic fruit of Morinda citrifolia, also known as noni fruit. Recent studies by our group and others have examined genome-wide gene expression responses of fruit flies to individual highly abundant compounds found in noni responsible for the fruit’s unique chemistry and toxicity. In order to relate these reductionist experiments to the gene expression responses to feeding on noni fruit itself, we fed rotten noni fruit to adult female D. sechellia and performed RNA-sequencing. Combining the reductionist and more wholistic approaches, we have identified candidate genes that may contribute to each individual compound and those that play a more general role in response to the fruit as a whole. Using the compound specific and general responses, we used transcription factor prediction analyses to identify the regulatory networks and specific regulators involved in the responses to each compound and the fruit itself. The identified genes and regulators represent the possible genetic mechanisms and biochemical pathways that contribute to toxin resistance and noni specialization in D. sechellia.
2022-06-08 | GSE205467 | GEO
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.
2019-09-28 | GSE138119 | GEO
Project description:Transcriptional profiling of 3 day old virgin male and female adults comparing control male Drosophila melanogaster (MDM) versus male D sechellia (MDS) and comparing control female Drosophila melanogaster (FDM) versus female D sechellia (FDS). Goal was to determine why D sechellia is tolerant to octanoïc acid, the major toxic compound of Morinda citrifolia fruit
2018-01-15 | GSE52191 | GEO
Project description:Here we show that Drosophila sechelliaM-bM-^@M-^Ta specialist on the fruit of Morinda citrifolia that recently diverged from its generalist sister-species, D. simulansM-bM-^@M-^Thas rapidly accumulated loss-of-function alleles and reduced gene expression at genes affecting olfaction, detoxification, and metabolism. While D. sechellia increases expression of genes involved with oogenesis and fatty acid metabolism when on its host, many more genes show reduced expression in D. sechellia. For several functionally related genes, this decrease in expression is associated with loss-of-function alleles. The rapid accumulation of these alleles potentially affected D. sechelliaM-bM-^@M-^Ys initial adaptation to M. citrifolia, likely contributes to D. sechelliaM-bM-^@M-^Ys poor competitive ability off of its host, and increases ecological isolation between D. sechellia and its sister species. Keywords: comparative hybridization, gene expression 2 species (simulans and sechella) by choice vs no-choice treatment for octanoic & hexanoic acid blend
2008-11-25 | E-GEOD-13723 | biostudies-arrayexpress
Project description:To explore how brains change upon species evolution, we generated the first whole central brain comparative single-cell transcriptomic atlases of three closely-related but ecologically-distinct drosophilids: D. melanogaster, D. simulans and D. sechellia. D. melanogaster and D. simulans are cosmopolitan generalists, while the island endemic D. sechellia exhibits extreme niche specialism on the ripe noni fruit of the Morinda citrifolia shrub. The global cellular composition of central brains is well-conserved in the three Drosophila species, but we predicted a few cell types (perineurial glia, sNPF and Dh44 neurons) with divergent frequencies. Gene expression analysis revealed that distinct cell types within the central brain evolve at different rates and patterns; notably, several glial cell types exhibit the greatest divergence between species. Compared to D. melanogaster, the cellular composition and gene expression patterns of the central brain in D. sechellia displays greater deviation than those of D. simulans, indicating that the distinctive ecological specialization of D. sechellia is reflected in the structure and function of its brain. Gene expression changes in D. sechellia encompass metabolic and ecdysone signaling genes, indicative of adaptations to its novel ecological demands. Additional single-cell transcriptomic analysis on D. sechellia revealed genes and cell types responsive to noni juice supplementation, showing glial cells as key sites for both physiological and genetic adaptation to novel conditions. Our comparative transcriptomic atlases of drosophilid brains will provide an entry point to more broadly study the evolvability of nervous systems across and beyond the Drosophila genus.
2023-11-21 | GSE247965 | GEO
Project description:Here we show that Drosophila sechellia—a specialist on the fruit of Morinda citrifolia that recently diverged from its generalist sister-species, D. simulans—has rapidly accumulated loss-of-function alleles and reduced gene expression at genes affecting olfaction, detoxification, and metabolism. While D. sechellia increases expression of genes involved with oogenesis and fatty acid metabolism when on its host, many more genes show reduced expression in D. sechellia. For several functionally related genes, this decrease in expression is associated with loss-of-function alleles. The rapid accumulation of these alleles potentially affected D. sechellia’s initial adaptation to M. citrifolia, likely contributes to D. sechellia’s poor competitive ability off of its host, and increases ecological isolation between D. sechellia and its sister species. Keywords: comparative hybridization, gene expression
2008-11-25 | GSE13723 | GEO
Project description:Genomics analysis of Drosophila sechellia response to Morinda citrifolia fruit diet
| PRJNA845784 | ENA
Project description:Here we show that Drosophila sechelliaâa specialist on the fruit of Morinda citrifolia that recently diverged from its generalist sister-species, D. simulansâhas rapidly accumulated loss-of-function alleles and reduced gene expression at genes affecting olfaction, detoxification, and metabolism. While D. sechellia increases expression of genes involved with oogenesis and fatty acid metabolism when on its host, many more genes show reduced expression in D. sechellia. For several functionally related genes, this decrease in expression is associated with loss-of-function alleles. The rapid accumulation of these alleles potentially affected D. sechelliaâs initial adaptation to M. citrifolia, likely contributes to D. sechelliaâs poor competitive ability off of its host, and increases ecological isolation between D. sechellia and its sister species. Our results suggest that a subset of genes reduce or lose function as a consequence of host specialization, which may explain why, in general, specialist insects tend to shift to chemically similar hosts. Moreover, if the accumulation of non- or weakly functional genes in a specialist enhances the ecological isolation between it and other species, then this process may explain why specialists are speciose. Keywords: comparative hybridization, gene expression 2 species (simulans and sechella) by choice vs no-choice treatment for octanoic & hexanoic acid blend
2010-06-24 | E-GEOD-13789 | biostudies-arrayexpress