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Published November 19, 2014 | Accepted Version + Supplemental Material
Journal Article Open

Independent, Reciprocal Neuromodulatory Control of Sweet and Bitter Taste Sensitivity during Starvation in Drosophila


An organism's behavioral decisions often depend upon the relative strength of appetitive and aversive sensory stimuli, the relative sensitivity to which can be modified by internal states like hunger. However, whether sensitivity to such opposing influences is modulated in a unidirectional or bidirectional manner is not clear. Starved flies exhibit increased sugar and decreased bitter sensitivity. It is widely believed that only sugar sensitivity changes, and that this masks bitter sensitivity. Here we use gene- and circuit-level manipulations to show that sweet and bitter sensitivity are independently and reciprocally regulated by starvation in Drosophila. We identify orthogonal neuromodulatory cascades that oppositely control peripheral taste sensitivity for each modality. Moreover, these pathways are recruited at increasing hunger levels, such that low-risk changes (higher sugar sensitivity) precede high-risk changes (lower sensitivity to potentially toxic resources). In this way, state-intensity-dependent, reciprocal regulation of appetitive and aversive peripheral gustatory sensitivity permits flexible, adaptive feeding decisions.

Additional Information

© 2014 Elsevier B.V. Under an Elsevier user license. Accepted: September 15, 2014; published: October 30, 2014. Fly stocks were generously provided by the Bloomington Stock Center; by the VDRC Stock Center; by the Drosophila RNAi Screening Center; and by Drs. K. Yu, J.W. Wang, P. Shen, J.H. Park, M.J. Pankratz, G.M. Rubin, B. Pfeiffer, J.H. Simpson, L.L. Looger, K. Scott, C. Montell, H. Amrein, G.S. Suh, H. Keshishian, P.A. Garrity, T. Kitamoto, H. Ishimoto, and B.J. Dickson. We also thank Dr. D. R. Nässel for anti-sNPF precursor serum. H.K.I. is supported by the Nakajima Foundation. D.J.A. is an investigator of the Howard Hughes Medical Institute. This work was supported in part by NIH grant 1RO1 DA031389 to D.J.A.

Attached Files

Accepted Version - nihms663461.pdf

Supplemental Material - mmc1.pdf


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August 20, 2023
October 18, 2023