A developmental framework linking neurogenesis and circuit formation in the Drosophila CNS
- Howard Hughes Medical Institute, University of Oregon, United States
- Howard Hughes Medical Institute, University of Oregonof Oregon, United States
- Columbia University, United States
- University of Cambridge, United Kingdom
- Janelia Research Campus, Howard Hughes Medical Institute, United States
Abstract
The mechanisms specifying neuronal diversity are well-characterized, yet it remains unclear how or if these mechanisms regulate neural circuit assembly. To address this, we mapped the developmental origin of 160 interneurons from seven bilateral neural progenitors (neuroblasts), and identify them in a synapse-scale TEM reconstruction of the Drosophila larval CNS. We find that lineages concurrently build the sensory and motor neuropils by generating sensory and motor hemilineages in a Notch-dependent manner. Neurons in a hemilineage share common synaptic targeting within the neuropil, which is further refined based on neuronal temporal identity. Connectome analysis shows that hemilineage-temporal cohorts share common connectivity. Finally, we show that proximity alone cannot explain the observed connectivity structure, suggesting hemilineage/temporal identity confers an added layer of specificity. Thus, we demonstrate that the mechanisms specifying neuronal diversity also govern circuit formation and function, and that these principles are broadly applicable throughout the nervous system.
Data availability
All data are publicly available from https://github.com/bjm5164/Mark2020_larval_development.
Article and author information
Author details
Ashok Litwin-Kumar
Funding
NIH (HD27056)
- Brandon Mark
- Sen-Lin Lai
- Aref Arzan Zarin
- Laurina Manning
- Heather Q Pollington
- Chris Q Doe
HHMI
- Brandon Mark
- Sen-Lin Lai
- Aref Arzan Zarin
- Laurina Manning
- Heather Q Pollington
- Chris Q Doe
HHMI - Janelia Research Campus
- Albert Cardona
- James W Truman
The funders had no role in study design, data collection and interpretation, or the decision to submit the work for publication.
Copyright
© 2021, Mark et al.
This article is distributed under the terms of the Creative Commons Attribution License permitting unrestricted use and redistribution provided that the original author and source are credited.
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A developmental framework linking neurogenesis and circuit formation in the Drosophila CNS
eLife 10:e67510.
https://doi.org/10.7554/eLife.67510
