Study identifies genetic variants controlling how fruit flies develop at different sugar levels
Researchers used fruit fly populations to map genetic variants that control development time in response to dietary sugar, finding that high sugar triggers different genetic effects than low sugar diets. The study identified specific genes like tap, Eip75B, and Cerk that show diet-dependent effects on development. These findings provide a framework for understanding how diet reshapes genetic control of developmental traits, with potential implications for understanding metabolic adaptation.
Scientists combined phenotyping of fruit fly reference lines with genome-wide mapping in newly developed recombinant populations to identify how genetic variation interacts with diet to affect development time. High sugar diets produced genotype- and life-stage-dependent changes in metabolic and life-history traits, with development time emerging as a highly heritable trait sensitive to sugar levels. Mapping across 16 outbred advanced intercross populations revealed distinct genetic association patterns under low- versus high-sugar conditions, with concentrated signals under low sugar and more distributed patterns under high sugar. The researchers identified specific loci showing genotype-by-diet interactions and validated functional effects for several candidate genes. Allele-frequency analyses revealed variants associated with delayed development under high sugar but earlier development under low sugar, enriched in genes involved in cell adhesion, neurodevelopment, and morphogenesis.
Limitations & open questions
The study does not discuss potential limitations of using Drosophila as a model for understanding human metabolic responses to dietary sugar, nor does it address whether these diet-dependent genetic effects are conserved across species or specific to fruit flies.
What different sources said
- bioRxivCenter
Outbred Drosophila populations reveal diet-dependent genetic effects on development time
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