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  Temporal response dynamics of Drosophila olfactory sensory neurons depends on receptor type and response polarity

Getahun, M. N., Wicher, D., Hansson, B., & Olsson, S. (2012). Temporal response dynamics of Drosophila olfactory sensory neurons depends on receptor type and response polarity. Frontiers in Cellular Neuroscience, 6: 54. doi:10.3389/fncel.2012.00054.

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http://dx.doi.org/10.3389/fncel.2012.00054 (Publisher version)
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Getahun, Merid Negash1, 2, Author           
Wicher, Dieter1, Author           
Hansson, Bill1, Author           
Olsson, Shannon1, Author           
Affiliations:
1Department of Evolutionary Neuroethology, Prof. B. S. Hansson, MPI for Chemical Ecology, Max Planck Society, ou_421894              
2IMPRS on Ecological Interactions, MPI for Chemical Ecology, Max Planck Society, Jena, DE, ou_421900              

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 Abstract: Insect olfactory sensory neurons (OSN) express a diverse array of receptors from different protein families, i.e. ionotropic receptors (IR), gustatory receptors (GR) and odorant receptors (OR). It is well known that insects are exposed to a plethora of odor molecules that vary widely in both space and time under turbulent natural conditions. In addition to divergent ligand specificities, these different receptors might also provide an increased range of temporal dynamics and sensitivities for the olfactory system. To test this, we challenged different Drosophila OSNs with both varying stimulus durations (10–2000 ms), and repeated stimulus pulses of key ligands at various frequencies (1–10 Hz). Our results show that OR-expressing OSNs responded faster and with higher sensitivity to short stimulations as compared to IR- and Gr21a-expressing OSNs. In addition, OR-expressing OSNs could respond to repeated stimulations of excitatory ligands up to 5 Hz, while IR-expressing OSNs required ~5x longer stimulations and/or higher concentrations to respond to similar stimulus durations and frequencies. Nevertheless, IR-expressing OSNs did not exhibit adaptation to longer stimulations, unlike OR- and Gr21a-OSNs. Both OR- and IR-expressing OSNs were also unable to resolve repeated pulses of inhibitory ligands as fast as excitatory ligands. These differences were independent of the peri-receptor environment in which the receptors were expressed and suggest that the receptor expressed by a given OSN affects both its sensitivity and its response to transient, intermittent chemical stimuli. OR-expressing OSNs are better at resolving low dose, intermittent stimuli, while IR-expressing OSNs respond more accurately to long-lasting odor pulses. This diversity increases the capacity of the insect olfactory system to respond to the diverse spatiotemporal signals in the natural environment.

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 Dates: 20122012-10-282012-11-16
 Publication Status: Issued
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 Identifiers: Other: HAN167
DOI: 10.3389/fncel.2012.00054
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Title: Frontiers in Cellular Neuroscience
  Other : Front. Cell. Neurosci.
  Abbreviation : FNCEL
Source Genre: Journal
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Publ. Info: Lausanne : Frontiers Media
Pages: - Volume / Issue: 6 Sequence Number: 54 Start / End Page: - Identifier: ISSN: 1664-8714
ISSN: 1662-5102
CoNE: https://pure.mpg.de/cone/journals/resource/1662-5102