Navigational choice between reversal and curve during acidic pH avoidance behavior in Caenorhabditis elegans
| Autor: | Kazumi Sakata, Tokumitsu Wakabayashi, Hiroaki Itoi, Sayaka Shinohe, Ryuzo Shingai, Miwa Watanabe, Takuya Togashi |
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| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Glutamic Acid
Klinokinesis Sensory system Neurotransmission Biology Stimulus (physiology) Motor Activity Choice Behavior Models Biological Synaptic Transmission Animals Genetically Modified Cellular and Molecular Neuroscience Avoidance Learning Thermotaxis Animals Computer Simulation Caenorhabditis elegans General Neuroscience Acidic pH avoidance Chemotaxis Hydrogen-Ion Concentration biology.organism_classification Navigation Chemoreceptor Cells Mutation Biophysics Glutamic acid metabolism Sensory-motor transformation Neuroscience Research Article Spatial Navigation |
| Zdroj: | BMC Neuroscience |
| ISSN: | 1471-2202 |
| Popis: | Background Under experimental conditions, virtually all behaviors of Caenorhabditis elegans are achieved by combinations of simple locomotion, including forward, reversal movement, turning by deep body bending, and gradual shallow turning. To study how worms regulate these locomotion in response to sensory information, acidic pH avoidance behavior was analyzed by using worm tracking system. Results In the acidic pH avoidance, we characterized two types of behavioral maneuvers that have similar behavioral sequences in chemotaxis and thermotaxis. A stereotypic reversal-turn-forward sequence of reversal avoidance caused an abrupt random reorientation, and a shallow gradual turn in curve avoidance caused non-random reorientation in a less acidic direction to avoid the acidic pH. Our results suggest that these two maneuvers were each triggered by a distinct threshold pH. A simulation study using the two-distinct-threshold model reproduced the avoidance behavior of the real worm, supporting the presence of the threshold. Threshold pH for both reversal and curve avoidance was altered in mutants with reduced or enhanced glutamatergic signaling from acid-sensing neurons. Conclusions C. elegans employ two behavioral maneuvers, reversal (klinokinesis) and curve (klinotaxis) to avoid acidic pH. Unlike the chemotaxis in C. elegans, reversal and curve avoidances were triggered by absolute pH rather than temporal derivative of stimulus concentration in this behavior. The pH threshold is different between reversal and curve avoidance. Mutant studies suggested that the difference results from a differential amount of glutamate released from ASH and ASK chemosensory neurons. Electronic supplementary material The online version of this article (doi:10.1186/s12868-015-0220-0) contains supplementary material, which is available to authorized users. |
| Databáze: | OpenAIRE |
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