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Eight different types of dopaminergic neurons innervate the Drosophila mushroom body neuropil: anatomical and physiological heterogeneity.

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TLDR
Results indicate that distinct dopaminergic neurons define separate zones of the mushroom body lobes and are probably involved in different functions.
Abstract
We examined tyrosine hydroxylase (TH-GAL4) expression and anti-TH immunoreactivity in the Drosophila protocerebrum and characterized single cell clones of the TH-GAL4 neurons Eight clusters of putative dopaminergic neurons were characterized Neurons in three of the clusters project to the mushroom body neuropil: PAM neurons project to the medial portion of the horizontal lobes; PPL1 neurons project to the vertical lobes, the junction area, the heel and distal peduncle; and PPL2ab neurons project to the calyx Five types of PPL1 neurons were discovered that innervate different zones of the mushroom body lobes Functional imaging experiments showed that the dopaminergic processes in four of the zones differ in response properties to odor, electric shock, or following the pairing of odor and electric shock These results indicate that distinct dopaminergic neurons define separate zones of the mushroom body lobes and are probably involved in different functions Differences in functional response properties of these neurons suggest that they are involved in different behavioral processes

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Citations
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Journal ArticleDOI

The neuronal architecture of the mushroom body provides a logic for associative learning

TL;DR: The elucidation of the complement of neurons of the MB provides a comprehensive anatomical substrate from which one can infer a functional logic of associative olfactory learning and memory.
Journal ArticleDOI

A connectome and analysis of the adult Drosophila central brain

Louis K. Scheffer, +114 more
- 07 Sep 2020 - 
TL;DR: Improved methods are summarized and the circuitry of a large fraction of the brain of the fruit fly Drosophila melanogaster is presented, reducing the effort needed to answer circuit questions and providing procedures linking the neurons defined by the analysis with genetic reagents.
References
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TL;DR: The results suggest that in associative conditioning, different memories are formed of the same odor under different circumstances, and that they are linked to the respective motivational systems by their specific modulatory pathways.
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TL;DR: This review focuses on the pharmacological and biochemical features shared by the dopamine receptors and their coupling to secondary messenger pathways and their physiological function based upon studies using pharmacological tools, specific brain lesions and, more recently, genetically modified animal models.
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What are the different types of dopaminergic neurons?

The paper identifies eight different types of dopaminergic neurons in the Drosophila mushroom body neuropil.