Article

Chemosensory Transduction in Arthropods

Monika Stengl

in The Oxford Handbook of Invertebrate Neurobiology

Published in print April 2019 | ISBN: 9780190456757
Published online February 2017 | e-ISBN: 9780190456764 | DOI: https://dx.doi.org/10.1093/oxfordhb/9780190456757.013.15

Series: Oxford Handbooks

Chemosensory Transduction in Arthropods

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Reception of chemicals via olfaction and gustation are prerequisites to find, distinguish, and recognize food and mates and to avoid dangers. Several receptor gene superfamilies are employed in arthropod chemosensation: inverse 7-transmembrane (7-TM) gustatory and olfactory receptors (GRs, ORs), 3-TM ionotropic glutamate-related receptors (IRs), receptor-guanylyl cyclases, transient receptor potential ion channels, and epithelial sodium channels. Some of these receptor gene families have ancient origins and expanded in several taxa, producing very large, variant gene families adapted to the respectively relevant odor ligands in species-specific environments. Biochemical and electrophysiological studies in situ as well as molecular genetics found evidence for G-protein-dependent signal transduction cascades for ORs, GRs, and IRs, suggesting that signal amplification is paramount for chemical senses. In contrast, heterologous expression studies argued for primarily ionotropic transduction as a prerequisite to interstimulus intervals in the range of microseconds.

Keywords: olfaction; gustation; insects; crustaceans; receptors; antennae; Orco; ionotropic; metabotropic transduction

Article.  16010 words. 

Subjects: Invertebrate Neurobiology ; Molecular and Cellular Systems

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