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How sensitive is a nose?

Richard G Vogt1

  • 1Department of Biological Sciences, University of South Carolina, Columbia, SC 29208, USA. vogt@biol.sc.edu

Science'S STKE : Signal Transduction Knowledge Environment
|February 16, 2006
PubMed
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Odor sensitivity may stem from signal pathways, not just receptor binding. These findings on olfactory receptors (ORs) could explain how animals detect crucial scents, like mosquitoes detecting malaria-carrying humans.

Area of Science:

  • Olfactory neuroscience
  • Molecular biology
  • Evolutionary biology

Background:

  • Odor sensitivity is traditionally linked to odor-receptor (OR) binding.
  • Recent studies question this, proposing alternative mechanisms for olfactory perception.

Purpose of the Study:

  • To explore alternative mechanisms of odor sensitivity beyond direct OR binding.
  • To compare olfactory transduction with visual systems and consider evolutionary origins of ORs.

Main Methods:

  • Analysis of recent studies on odor-receptor interactions and G protein activation.
  • Comparative analysis of olfactory and visual receptor systems across phyla.

Main Results:

  • Odor-OR interactions are brief and activate G proteins infrequently, unlike visual receptors.

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  • Olfactory receptors may have independent origins or share ancient ancestry with diversifying selection.
  • Convergent evolution of OR mechanisms may occur across phyla for similar olfactory signals.

    • Conclusions:

    • Odor sensitivity may arise from transduction pathways and neuronal convergence, not solely OR binding.
    • Understanding frog olfactory mechanisms may offer insights into disease vector olfaction, such as mosquitoes detecting malaria hosts.