Additive Expression of Consolidated Memory through Drosophila Mushroom Body Subsets

Yang, C. H., Shih, M. F., Chang, C. C., Chiang, M. H., Shih, H. W., Tsai, Y. L., Chiang, A. S., Fu, T. F., Wu, C. L. (May 2016) Additive Expression of Consolidated Memory through Drosophila Mushroom Body Subsets. PLoS Genet, 12 (5). e1006061. ISSN 1553-7404 (Electronic)1553-7390 (Linking)

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DOI: 10.1371/journal.pgen.1006061


Associative olfactory memory in Drosophila has two components called labile anesthesia-sensitive memory and consolidated anesthesia-resistant memory (ARM). Mushroom body (MB) is a brain region critical for the olfactory memory and comprised of 2000 neurons that can be classified into alphabeta, alpha'beta', and gamma neurons. Previously we demonstrated that two parallel pathways mediated ARM consolidation: the serotonergic dorsal paired medial (DPM)-alphabeta neurons and the octopaminergic anterior paired lateral (APL)-alpha'beta' neurons. This finding prompted us to ask how this composite ARM is retrieved. Here, we showed that blocking the output of alphabeta neurons and that of alpha'beta' neurons each impaired ARM retrieval, and blocking both simultaneously had an additive effect. Knockdown of radish and octbeta2R in alphabeta and alpha'beta' neurons, respectively, impaired ARM. A combinatorial assay of radish mutant background rsh1 and neurotransmission blockade confirmed that ARM retrieved from alpha'beta' neuron output is independent of radish. We identified MBON-beta2beta'2a and MBON-beta'2mp as the MB output neurons downstream of alphabeta and alpha'beta' neurons, respectively, whose glutamatergic transmissions also additively contribute to ARM retrieval. Finally, we showed that alpha'beta' neurons could be functionally subdivided into alpha'beta'm neurons required for ARM retrieval, and alpha'beta'ap neurons required for ARM consolidation. Our work demonstrated that two parallel neural pathways mediating ARM consolidation in Drosophila MB additively contribute to ARM expression during retrieval.

Item Type: Paper
Subjects: organism description > animal > insect > Drosophila
organism description > animal behavior > memory
organs, tissues, organelles, cell types and functions > tissues types and functions > mushroom body
CSHL Authors:
Communities: CSHL labs > Dubnau lab
Depositing User: Matt Covey
Date: 19 May 2016
Date Deposited: 01 Jul 2016 16:51
Last Modified: 01 Jul 2016 16:51
PMCID: PMC4873240
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