{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,10]],"date-time":"2026-03-10T19:22:32Z","timestamp":1773170552487,"version":"3.50.1"},"reference-count":116,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2024,1,25]],"date-time":"2024-01-25T00:00:00Z","timestamp":1706140800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Mol. Biosci."],"abstract":"<jats:p>In insects, antennal ionotropic receptors (IRs) and odorant receptors (ORs) are among the main sensors of olfactory cues. To functionally characterize the subunits from these receptors, the use of ab3A neurons from transgenic <jats:italic>Drosophila melanogaster<\/jats:italic> represented one of the most powerful tools, allowing the identification of ligands (deorphanization) and decrypting their pharmacological properties. However, further investigation is needed to shed light on possible metabotropic functionalities behind insect olfactory receptors and test potentials from the up-to-now-used <jats:italic>empty neuronal systems<\/jats:italic> to express subunits belonging to variegate receptor classes. In this project, we adopted the most updated system of <jats:italic>Drosophila<\/jats:italic> ab3A empty neurons to test various olfactory receptors, ranging from human ORs working as metabotropic G-protein coupled receptors to insect ionotropic IRs and ORs. Testing transgenic <jats:italic>Drosophila<\/jats:italic> expressing human ORs into ab3A neurons by single sensillum recording did not result in an OR response to ligands, but it rather re-established neuronal spiking from the empty neurons. When transgenic <jats:italic>D. melanogaster<\/jats:italic> expressed ionotropic IRs and ORs, both heterologous and cis-expressed IRs were non-functional, but the <jats:italic>Drosophila suzukii<\/jats:italic> OR19A1 subunit responded to a wide asset of ligands, distinguishing phasic or tonic compound-dependent effects. Despite the use of <jats:italic>Drosophila<\/jats:italic> ab3A neurons to test the activation of some metabotropic and ionotropic receptor subunits resulted non-functional, this study deorphanized a key OR of <jats:italic>D. suzukii<\/jats:italic> demonstrating its binding to alcohols, ketones, terpenes, and esters.<\/jats:p>","DOI":"10.3389\/fmolb.2023.1275901","type":"journal-article","created":{"date-parts":[[2024,1,26]],"date-time":"2024-01-26T11:48:36Z","timestamp":1706269716000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":8,"title":["Heterologous investigation of metabotropic and ionotropic odorant receptors in ab3A neurons of Drosophila melanogaster"],"prefix":"10.3389","volume":"10","author":[{"given":"Johan Henning","family":"Pettersson","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Alberto Maria","family":"Cattaneo","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1965","published-online":{"date-parts":[[2024,1,25]]},"reference":[{"key":"B1","doi-asserted-by":"publisher","first-page":"44","DOI":"10.1016\/j.neuron.2010.11.042","article-title":"Functional architecture of olfactory ionotropic glutamate receptors","volume":"69","author":"Abuin","year":"2011","journal-title":"Neuron"},{"key":"B2","doi-asserted-by":"publisher","first-page":"e1002821","DOI":"10.1371\/journal.pgen.1002821","article-title":"Functional evolution of mammalian odorant receptors","volume":"8","author":"Adipietro","year":"2012","journal-title":"Plos Genet."},{"key":"B3","doi-asserted-by":"publisher","first-page":"10741","DOI":"10.1523\/JNEUROSCI.5419-12.2013","article-title":"Ionotropic glutamate receptors IR64a and IR8a form a functional odorant receptor complex in vivo in Drosophila","volume":"33","author":"Ai","year":"2013","journal-title":"J. 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