Diversity, variability, and suboesophageal connectivity of antennal lobe neurons in D. melanogaster larvae

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2011
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Leisibach, Basil
Gendre, Nanae
Selcho, Mareike
Stocker, Reinhard F.
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The Journal of Comparative Neurology. 2011, 519(17), pp. 3415-3432. ISSN 0021-9967. eISSN 1096-9861. Available under: doi: 10.1002/cne.22713
Zusammenfassung

Whereas the “vertical” elements of the insect olfactory pathway, the olfactory receptor neurons and the projection neurons, have been studied in great detail, local interneurons providing “horizontal” connections in the antennal lobe were ignored for a long time. Recent studies in adult Drosophila demonstrate diverse roles for these neurons in the integration of odor information, consistent with the identification of a large variety of anatomical and neurochemical subtypes. Here we focus on the larval olfactory circuit of Drosophila, which is much reduced in terms of cell numbers. We show that the horizontal connectivity in the larval antennal lobe differs largely from its adult counterpart. Only one of the five anatomical types of neurons we describe is restricted to the antennal lobe and therefore fits the definition of a local interneuron. Interestingly, the four remaining subtypes innervate both the antennal lobe and the suboesophageal ganglion. In the latter, they may overlap with primary gustatory terminals and with arborizations of hugin cells, which are involved in feeding control. This circuitry suggests special links between smell and taste, which may reflect the chemosensory constraints of a crawling and burrowing lifestyle. We also demonstrate that many of the neurons we describe exhibit highly variable trajectories and arborizations, especially in the suboesophageal ganglion. Together with reports from adult Drosophila, these data suggest that wiring variability may be another principle of insect brain organization, in parallel with stereotypy.

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570 Biowissenschaften, Biologie
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Drosophila, larvae, olfactory system, interneurons
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ISO 690THUM, Andreas, Basil LEISIBACH, Nanae GENDRE, Mareike SELCHO, Reinhard F. STOCKER, 2011. Diversity, variability, and suboesophageal connectivity of antennal lobe neurons in D. melanogaster larvae. In: The Journal of Comparative Neurology. 2011, 519(17), pp. 3415-3432. ISSN 0021-9967. eISSN 1096-9861. Available under: doi: 10.1002/cne.22713
BibTex
@article{Thum2011-12-01Diver-17162,
  year={2011},
  doi={10.1002/cne.22713},
  title={Diversity, variability, and suboesophageal connectivity of antennal lobe neurons in D. melanogaster larvae},
  number={17},
  volume={519},
  issn={0021-9967},
  journal={The Journal of Comparative Neurology},
  pages={3415--3432},
  author={Thum, Andreas and Leisibach, Basil and Gendre, Nanae and Selcho, Mareike and Stocker, Reinhard F.}
}
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