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Julie M Cridland1, Giovanni Hanna1, Tiezheng Fan1

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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.