Light Activation of an Innate Olfactory Avoidance Response in Drosophila
| Autor: | David J. Anderson, Shlomo Ben-Tabou de Leon, Greg S. B. Suh, André Fiala, Seymour Benzer, Hiromu Tanimoto |
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| Jazyk: | angličtina |
| Rok vydání: | 2007 |
| Předmět: |
Light
Sensory system Stimulation Avoidance response Biology Olfactory Receptor Neurons General Biochemistry Genetics and Molecular Biology medicine Animals Drosophila Proteins Gene Silencing Receptor G protein-coupled receptor Glomerulus (olfaction) Olfactory receptor Behavior Animal Agricultural and Biological Sciences(all) Biochemistry Genetics and Molecular Biology(all) Electric Conductivity Anatomy Carbon Dioxide Smell medicine.anatomical_structure Odorants Drosophila Antennal lobe General Agricultural and Biological Sciences SYSNEURO Neuroscience |
| Popis: | How specific sensory stimuli evoke specific behaviors is a fundamental problem in neurobiology. In Drosophila, most odorants elicit attraction or avoidance depending on their concentration, as well as their identity [1]. Such odorants, moreover, typically activate combinations of glomeruli in the antennal lobe of the brain 2, 3 and 4, complicating the dissection of the circuits translating odor recognition into behavior. Carbon dioxide (CO_2), in contrast, elicits avoidance over a wide range of concentrations 5 and 6 and activates only a single glomerulus, V [5]. The V glomerulus receives projections from olfactory receptor neurons (ORNs) that coexpress two GPCRs, Gr21a and Gr63a, that together comprise a CO_2 receptor 7, 8 and 9. These CO_2-sensitive ORNs, located in the ab1 sensilla of the antenna, are called ab1c neurons [10]. Genetic silencing of ab1c neurons indicates that they are necessary for CO_2-avoidance behavior [5]. Whether activation of these neurons alone is sufficient to elicit this behavior, or whether CO_2 avoidance requires additional inputs (e.g., from the respiratory system), remains unclear. Here, we show that artificial stimulation of ab1c neurons with light (normally attractive to flies) elicits the avoidance behavior typical of CO_2. Thus, avoidance behavior appears hardwired into the olfactory circuitry that detects CO_2 in Drosophila. |
| Databáze: | OpenAIRE |
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