Cellular identification of water gustatory receptor neurons and their central projection pattern in Drosophila
Water perception is important for insects, because they are particularly vulnerable to water loss because their body size is small. In Drosophila, gustatory receptor neurons are located at the base of the taste sensilla on the labellum, tarsi, and wing margins. One of the gustatory receptor neurons...
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Published in | Proceedings of the National Academy of Sciences - PNAS Vol. 103; no. 4; pp. 1094 - 1099 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
United States
National Academy of Sciences
24.01.2006
National Acad Sciences |
Subjects | |
Online Access | Get full text |
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Summary: | Water perception is important for insects, because they are particularly vulnerable to water loss because their body size is small. In Drosophila, gustatory receptor neurons are located at the base of the taste sensilla on the labellum, tarsi, and wing margins. One of the gustatory receptor neurons in typical sensilla is known to respond to water. To reveal the neural mechanisms of water perception in Drosophila, it is necessary to identify water receptor neurons and their projection patterns. We used a Gal4 enhancer trap strain in which GAL4 is expressed in a single gustatory receptor neuron in each sensillum on the labellum. We investigated the function of these neurons by expressing the upstream activating sequence transgenes, shibire(ts1), tetanus toxin light chain, or diphtheria toxin A chain. Results from the proboscis extension reflex test and electrophysiological recordings indicated that the GAL4-expressing neurons respond to water. We show here that the water receptor neurons project to a specific region in the subesophageal ganglion, thus revealing the water taste sensory map in Drosophila. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 Conflict of interest statement: No conflicts declared. This paper was submitted directly (Track II) to the PNAS office. Abbreviations: DTI, diphtheria toxin A chain; HRP, horseradish peroxidase; SOG, subesophageal ganglion; TNT, tetanus toxin light chain; UAS, upstream activating sequence; PER, proboscis extension reflex. Edited by Obaid Siddiqi, National Center for Biological Sciences, Bangalore, India, and approved December 5, 2005 To whom correspondence should be addressed. E-mail: tanimura@rc.kyushu-u.ac.jp. |
ISSN: | 0027-8424 1091-6490 |
DOI: | 10.1073/pnas.0502376103 |