Response of Drosophila to wasabi is mediated by painless, the fly homolog of mammalian TRPA1/ANKTM1

Current Biology : CB
Bader Al-AnziSeymour Benzer

Abstract

A number of repellent compounds produced by plants elicit a spicy or pungent sensation in mammals . In several cases, this has been found to occur through activation of ion channels in the transient receptor potential (TRP) family . We report that isothiocyanate (ITC), the pungent ingredient of wasabi, is a repellent to the insect Drosophila melanogaster, and that the painless gene, previously known to be required for larval nociception, is required for this avoidance behavior. A painless reporter gene is expressed in gustatory receptor neurons of the labial palpus, tarsus, and wing anterior margin, but not in olfactory receptor neurons, suggesting a gustatory role. Indeed, painless expression overlaps with a variety of gustatory-receptor gene reporters. Some, such as Gr66a, are known to be expressed in neurons that mediate gustatory repulsion . painless mutants are not taste blind; they show normal aversive gustatory behavior with salt and quinine and attractive responses to sugars and capsaicin. The painless gene is an evolutionary homolog of the mammalian "wasabi receptor" TRPA1/ANKTM1 , also thought to be involved in nociception. Our results suggest that the stinging sensation of isothiocyanate is caused by activation of an...Continue Reading

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