An expression atlas of variant ionotropic glutamate receptors identifies a molecular basis of carbonation sensing

Juan Antonio Sánchez-Alcañiz, Ana Florencia Silbering, Vincent Croset, Giovanna Zappia, Anantha Krishna Sivasubramaniam, Liliane Abuin, Saumya Yashmohini Sahai, Daniel Münch, Kathrin Steck, Thomas O. Auer, Steeve Cruchet, G. Larisa Neagu-Maier, Simon G. Sprecher, Carlos Ribeiro, Nilay Yapici and Richard Benton ()
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Juan Antonio Sánchez-Alcañiz: University of Lausanne
Ana Florencia Silbering: University of Lausanne
Vincent Croset: University of Lausanne
Giovanna Zappia: University of Lausanne
Anantha Krishna Sivasubramaniam: University of Lausanne
Liliane Abuin: University of Lausanne
Saumya Yashmohini Sahai: Cornell University
Daniel Münch: Champalimaud Centre for the Unknown
Kathrin Steck: Champalimaud Centre for the Unknown
Thomas O. Auer: University of Lausanne
Steeve Cruchet: University of Lausanne
G. Larisa Neagu-Maier: University of Fribourg
Simon G. Sprecher: University of Fribourg
Carlos Ribeiro: Champalimaud Centre for the Unknown
Nilay Yapici: Cornell University
Richard Benton: University of Lausanne

Nature Communications, 2018, vol. 9, issue 1, 1-14

Abstract: Abstract Through analysis of the Drosophila ionotropic receptors (IRs), a family of variant ionotropic glutamate receptors, we reveal that most IRs are expressed in peripheral neuron populations in diverse gustatory organs in larvae and adults. We characterise IR56d, which defines two anatomically-distinct neuron classes in the proboscis: one responds to carbonated solutions and fatty acids while the other represents a subset of sugar- and fatty acid-sensing cells. Mutational analysis indicates that IR56d, together with the broadly-expressed co-receptors IR25a and IR76b, is essential for physiological responses to carbonation and fatty acids, but not sugars. We further demonstrate that carbonation and fatty acids both promote IR56d-dependent attraction of flies, but through different behavioural outputs. Our work provides a toolkit for investigating taste functions of IRs, defines a subset of these receptors required for carbonation sensing, and illustrates how the gustatory system uses combinatorial expression of sensory molecules in distinct neurons to coordinate behaviour.

Date: 2018
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DOI: 10.1038/s41467-018-06453-1

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