Journal of Comparative Physiology A

, Volume 196, Issue 2, pp 97–109 | Cite as

Functional and molecular evolution of olfactory neurons and receptors for aliphatic esters across the Drosophila genus

  • Marien de Bruyne
  • Renee Smart
  • Elizabeth Zammit
  • Coral G. Warr
Original Paper

Abstract

Insect olfactory receptor (Or) genes are large, rapidly evolving gene families of considerable interest for evolutionary studies. They determine the responses of sensory neurons which mediate critical behaviours and ecological adaptations. We investigated the evolution across the genus Drosophila of a subfamily of Or genes largely responsible for the perception of ecologically relevant aliphatic esters; products of yeast fermentation and fruits. Odour responses were recorded from eight classes of olfactory receptor neurons known to express this Or subfamily in D. melanogaster and from homologous sensilla in seven other species. Despite the fact that these species have diverged over an estimated 40 million years, we find that odour specificity is largely maintained in seven of the eight species. In contrast, we observe extensive changes in most neurons of the outgroup species D. virilis, and in two neurons across the entire genus. Some neurons show small shifts in specificity, whilst some dramatic changes correlate with gene duplication or loss. An olfactory receptor neuron response similarity tree did not match an Or sequence similarity tree, but by aligning Or proteins of likely functional equivalence we identify residues that may be relevant for odour specificity. This will inform future structure–function studies of Drosophila Ors.

Keywords

Olfaction Evolution Odour response profile Receptor neurons Olfactory receptors 

Abbreviations

ORN

Olfactory receptor neuron

Or

Olfactory receptor

PCR

Polymerase chain reaction

Supplementary material

359_2009_496_MOESM1_ESM.pdf (3.7 mb)
Supplemental Fig. 1 (PDF 3804 kb)
359_2009_496_MOESM2_ESM.pdf (903 kb)
Supplemental Fig. 2 (PDF 903 kb)

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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • Marien de Bruyne
    • 1
  • Renee Smart
    • 1
  • Elizabeth Zammit
    • 1
  • Coral G. Warr
    • 1
  1. 1.School of Biological SciencesMonash UniversityClaytonAustralia

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