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Phylogenetic Relatedness Does not Predict Patterns of Parallel Transcriptome Adaptation in Drosophila
Julie M Cridland1, Giovanni Hanna1, Tiezheng Fan1
1Department of Evolution and Ecology, University of California, Davis, CA 95616, USA.
Genome Biology and Evolution
|August 19, 2025
Summary
Evolutionary adaptation shows parallel gene expression in fruit fly accessory glands but not testes. This adaptation
Area of Science:
- Evolutionary biology
- Genomics
- Molecular biology
Background:
- Understanding repeatable evolutionary adaptation is a key challenge.
- Latitudinal clines in Drosophila provide a model for studying adaptation.
- Investigating genetic variation and natural selection responses is crucial.
Purpose of the Study:
- To investigate male reproductive tract transcriptomes in three Drosophila species across latitudes.
- To identify factors influencing the repeatability of adaptation.
- To examine gene expression patterns in testes and accessory glands.
Main Methods:
- Comparative transcriptome analysis of Drosophila populations from Maine and Panama.
- Focus on three species: D. melanogaster, D. simulans, and D. hydei.
- Analysis of gene expression differentiation and correlations in male reproductive tissues.
Main Results:
- Strong evidence of parallel gene expression adaptation in accessory glands across latitudes.
- Limited evidence of parallel adaptation in testes.
- Degree of parallelism not correlated with species relatedness or ecological similarity.
Conclusions:
- Adaptive parallelism in gene expression is evident in fruit fly accessory glands.
- Idiosyncratic evolutionary processes may operate alongside deterministic ones.
- Relatedness and ecological similarity do not fully predict adaptive responses.
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