The ionotropic receptors IR21a and IR25a mediate cool sensing in Drosophila

Lina Ni, Mason Klein, Kathryn V. Svec, Gonzalo Budelli, Elaine C. Chang, Anggie J. Ferrer, Richard Benton, Aravinthan D.T. Samuel, Paul A. Garrity

Research output: Contribution to journalArticlepeer-review

107 Scopus citations


Animals rely on highly sensitive thermoreceptors to seek out optimal temperatures, but the molecular mechanisms of thermosensing are not well understood. The Dorsal Organ Cool Cells (DOCCs) of the Drosophila larva are a set of exceptionally thermosensitive neurons critical for larval cool avoidance. Here, we show that DOCC cool-sensing is mediated by Ionotropic Receptors (IRs), a family of sensory receptors widely studied in invertebrate chemical sensing. We find that two IRs, IR21a and IR25a, are required to mediate DOCC responses to cooling and are required for cool avoidance behavior. Furthermore, we find that ectopic expression of IR21a can confer coolresponsiveness in an Ir25a-dependent manner, suggesting an instructive role for IR21a in thermosensing. Together, these data show that IR family receptors can function together to mediate thermosensation of exquisite sensitivity.

Original languageEnglish (US)
Article numbere13254
Issue numberAPRIL2016
StatePublished - Apr 29 2016

ASJC Scopus subject areas

  • Neuroscience(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Immunology and Microbiology(all)


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