When deciding what to eat, animals evaluate sensory information about food quality alongside multiple ongoing internal states1,2,3,4,5,6,7,8,9,10. How internal states interact to alter sensorimotor processing and shape decisions such as food choice remains poorly understood. Here we use pan-neuronal volumetric activity imaging in the brain of Drosophila melanogaster to investigate the neuronal basis of internal state-dependent nutrient appetites. We created a functional atlas of the ventral fly brain and find that metabolic state shapes sensorimotor processing across large sections of the neuropil. By contrast, reproductive state acts locally to define how sensory information is translated into feeding motor output. These two states thus synergistically modulate protein-specific food intake and food choice. Finally, using a novel computational strategy, we identify driver lines that label neurons innervating state-modulated brain regions and show that the newly identified ‘borboleta’ region is sufficient to direct food choice towards protein-rich food. We thus identify a generalizable principle by which distinct internal states are integrated to shape decision making and propose a strategy to uncover and functionally validate how internal states shape behaviour.
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Descending GABAergic pathway links brain sugar-sensing to peripheral nociceptive gating in Drosophila
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Calcium imaging time series and behavioural data are available at https://github.com/ribeiro-lab/Muench.et.al.2022. TH-F single cell clones in Extended Data Fig. 6 are available from flycircuit.tw and virtualflybrain.org; all IDs are provided in Supplementary Table 4. Braincode cluster information can be downloaded from https://strawlab.org/braincode/r1/clusters/SEZ/CB1/K60_dicedist.
Custom R and Python code used for atlas building and data analysis is available at https://github.com/ribeiro-lab/Muench.et.al.2022.
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We thank C. Baltazar and L. Serra for technical assistance; A. Laborde, A. Ostrovsky, J. Baúto and the Champalimaud Software Platform for assistance in establishing the registration workflow on the HPC cluster; the Champalimaud Fly Platform for support with acquiring anatomical images; T. Fujiwara, R. Benton, D. Anderson and N. Yapici for sharing fly lines; K. Steck for the Ir76b-Gal4 immunostaining; G. Costa for assistance with illustrations; and I. Taştekin, S. Walker, G. Ezra-Nevo, M. Orger, E. Chiappe, S. Aimon, T. Tanimura and the whole Behaviour and Metabolism laboratory for many fruitful discussions, valuable feedback throughout the project, and comments on the manuscript. Further fly lines were obtained from the Bloomington Drosophila Stock Center (NIH P40OD018537) and the VDRC. D.M. was supported by a DFG Research Fellowship (MU 4116/1-1). D.G. was supported by a doctoral fellowship PD/BD/114273/2016 from the Portuguese Foundation for Science and Technology (FCT). The project leading to these results has received funding from la Caixa Banking Foundation to C.R. under the project code LCF/PR/HR17/52150002, a grant funded under the Lisbon Regional Operational Programme (POR) by national funds through the FCT–Fundação para a Ciência e Tecnologia, I.P. and co-financed by the European Regional Development Fund (ERDF) under the project 02/SAICT/300081/2017, and supported by the research infrastructure Congento, co-financed by Lisboa Regional Operational Programme (Lisboa2020), under the PORTUGAL 2020 Partnership Agreement, through the European Regional Development Fund (ERDF) and FCT–Fundação para a Ciência e Tecnologia (Portugal) under the project LISBOA-01-0145-FEDER-022170. Research at the Centre for the Unknown is supported by the Fundação Champalimaud.
The authors declare no competing interests.
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Extended data figures and tables
a, Per recording two consecutive taste stimulations lasting 5 s and 10 s respectively were applied to the proboscis. b, Experiments were performed in flies in four different internal state combinations. Experiments started with a recording without any stimulation and were followed by stimulations with three different taste stimuli (water, sucrose & yeast) that were applied in randomized order.
a, Maximum intensity projections of the 80 independent components identified by the spatial ICA algorithm35. b Consecutive sections of the resulting binary SEZ atlas after performing the atlas building steps. For details see Methods. c, Maximum intensity projections of the resulting independent components after running the ICA on temporally shuffled data using the exact same settings as in a. d, as in b but atlas building performed on data plotted in c. Scale bars correspond to 50 µm.
Five slices of the functional SEZ atlas, ordered from anterior (top) to posterior (bottom), indicating the corresponding atlas region numbers.
Stimulus-response maps for no stimulus and three different stimulations. Colors indicate median ΔF/F response values across animals during the first stimulation. Numbers indicate slice numbers.
a, Correlation matrix of yeast induced response patterns across animals. b, as a but with identities of atlas regions shuffled before calculating correlation coefficients. c, as previous matrices but with no taste stimulation performed. a-c and e, Colors indicate Pearson correlation coefficient (r), point size represents absolute r. d, Correlations of repeated stimulations within animals. Response patterns during the first stimulation were correlated to those during the second stimulation (stimulation 2), post stimulation (response magnitude of the last 5 timeframes of a recording), and second stimulation after shuffling region identities (stimulation 2 shuffled). n indicates number of animals. See Extended Data Fig. 1a for a stimulation scheme. e, as a but across animals in different metabolic states. As artifacts in region 35 lead to NaN values, we removed this region from this analysis.
Extended Data Fig. 6 Neurons described to be involved in feeding regulation, in relation to borboleta and sensory regions.
a, Maximum intensity projections of neuronal populations (blue) and inner- (green) and outer borboleta regions (magenta) registered to the JFRC2 Drosophila standard brain. b, Intersection of inner-, and outer borboleta regions with the corresponding neuronal populations shown in a, green pixels indicate overlap with the inner borboleta region, magenta pixels indicate overlap with the outer borboleta region. The only overlap we observed with the borboleta region was of Ir76b with the inner borboleta. This is likely due to neuronal tracts including sensory neurons passing through the inner borboleta region. c, Intersection of the AMS1 and PMS4 sensory regions with the corresponding neuronal populations shown in a, yellow pixels indicate overlap with AMS1, red pixels indicate overlap with PMS4. Scale bars correspond to 50 µm.
The change in response probability across SEZ regions upon protein deprivation for different food taste stimuli, mapped onto the SEZ atlas. Only changes in response probability that exceeded ± 0.3 are plotted.
Boxplots of yeast (a) and sucrose (b) stimulus-induced responses across all atlas regions, in mated fully fed or protein deprived females. The data is ordered according to the difference of median values between corresponding fully fed (gray) and protein-deprived (red) flies stimulated with yeast. yellow = sensory regions, blue = motor regions, arrowheads indicate borboleta regions. Points indicate ΔF/F response values in different experiments. Boxplots indicate median and quartiles. Wilcoxon rank-sum test, n = 7–10, * P < 0.05, ** P < 0.01, *** P < 0.001, **** P < 0.0001. All P-values and sample sizes are given in Tables S1 and S2.
Boxplot of response magnitudes upon stimulation with 1M sucrose in different metabolic states in the PMS4 sensory region and the outer borboleta region. Points indicate ΔF/F response values in each experiment. Boxplots indicate median and quartiles. Wilcoxon rank-sum test, numbers indicate P-values, n indicates number of animals.
Boxplot of response magnitudes upon stimulation with 2% yeast in different metabolic states in the AMS1 and PMS4 sensory regions and the outer borboleta region. Points indicate ΔF/F response values in each experiment. Boxplots indicate median and quartiles. Wilcoxon rank-sum test, numbers indicate P-values, n indicates number of animals.
Bootstrapped mean differences in response onset upon protein deprivation. Quantification was performed for regions active in fully fed and deprived state, (see Fig. 4g). Data is ordered according to mean difference in response onset. Points indicate the mean of bootstrapped differences of means between fully fed and deprived flies. Bars indicate 95% confidence intervals of the bootstrapped distributions derived from 10000 bootstrapped samples (see Methods). Shaded regions indicated density plots of the bootstrapped distributions. Colors indicate region categories (motor blue, sensory yellow, other gray).
Boxplots of yeast stimulus-induced responses across all atlas regions, in protein-deprived virgin or mated females. The data is ordered according to the difference of median values between corresponding virgin, protein-deprived flies (gray) and mated, protein-deprived flies (purple). yellow = sensory regions, blue = motor regions, arrowheads indicate borboleta regions. Points indicate ΔF/F response values in different experiments. Boxplots indicate median and quartiles. Wilcoxon rank-sum test, n = 8-9, * P < 0.05, ** P < 0.01, *** P < 0.001. All P-values and sample sizes are given in Table S3.
Stimulus-response maps for yeast stimulations in four internal states (fully fed & virgin, fully fed & mated, protein deprived & virgin, protein deprived & mated). Colors indicate mean ΔF/F response values across animals during the first stimulation.
Bootstrapped mean differences in response magnitude upon mating, for fully fed, black and protein deprived females, red. Plotted for regions 19, 44, 73, 74 (motor). Points indicate the mean of bootstrapped differences of means between virgin and mated flies. Bars indicate 95% confidence intervals of the bootstrapped distributions derived from 10000 bootstrapped samples (see Methods). Shaded regions indicated density plots of the bootstrapped distributions.
a, Anatomy of three Gal4 lines labeling neurons that innervate the outer borboleta region. top: maximum intensity projections of full confocal brain scans, bottom: zoom into the SEZ region. b, like a for inner borboleta lines. Scale bars correspond to 50 µm. Gal4 expression pattern (UAS-CD8::GFP) is shown in green, nc82 neuropil staining is shown in magenta.
Total duration of micromovements on yeast spots as measured by image-based tracking of mated female fully fed flies maintained for 2 h at restrictive temperature. Points indicate the total duration of micromovements flies performed on yeast food spots. Boxplots indicate median and quartiles. Wilcoxon rank-sum test, numbers indicate P-values, n indicates number of animals. Some outliers were excluded from plotting due to scaling.
Number of sips from 20 mM sucrose as measured by the flyPAD assay in mated fully fed female flies maintained for 2h at restrictive temperature. These data correspond to the experiments shown in Fig. 6. The genotype of the Gal4 lines used to drive TRPA1 expression is depicted below the plots with empty depicting the matching empty-Gal4 control. Outer borboleta lines in magenta and inner borboleta lines in green. Points indicate the average number of sips on sucrose for each fly. Boxplots indicate median and quartiles. Wilcoxon rank-sum test, numbers indicate P-values, n indicates number of animals.
a and b, Feeding microstructure parameters for control flies (57C10-Gal4,UAS-GCaMP6s) as measured using the flyPAD assay. Points indicate the mean inter-burst interval in seconds (a) and sips per feeding burst (b). Boxplots indicate median and quartiles. Wilcoxon rank-sum test, numbers indicate P-values, n indicates number of animals. c, Mean inter-burst interval as measured by the flyPAD assay from 10% yeast (top) and 20 mM sucrose (bottom), by mated female fully fed flies maintained for 2h at restrictive temperature. The genotype of the Gal4 lines used to drive TRPA1 expression is depicted below the plots with empty depicting the matching empty-Gal4 control. Results for lines showing expression in the outer borboleta are plotted in magenta and for lines showing expression in the inner borboleta are plotted in green. Points indicate the mean inter-burst interval in seconds for each fly. Wilcoxon rank-sum test. d, As c but for the number of sips per burst. All plots correspond to the analysis of the experiments shown in Fig. 6. Wilcoxon rank-sum test. Some outliers were excluded from plotting due to scaling.
Supplementary Tables 1–4.
3D NifTI image stack of the binary SEZ atlas used for signal extraction
3D NifTI image stack of the SEZ standard used for alignments.
Volume rendering of volumetric imaging data. Example recording showing the SEZ response upon yeast stimulation in a protein-deprived fly. The recording is looped and the z-plane is changed from anterior to posterior to show responses across different SEZ layers. The stimulation period is indicated in the upper left corner. Playback speed is 10×.
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Münch, D., Goldschmidt, D. & Ribeiro, C. The neuronal logic of how internal states control food choice. Nature 607, 747–755 (2022). https://doi.org/10.1038/s41586-022-04909-5
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