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Spatial constraints and cell surface molecule depletion structure a randomly connected learning circuit
Emma M Thornton-Kolbe1, Maria Ahmed2, Finley R Gordon2
1Neurosciences Graduate Program, University of Michigan Medical School, Ann Arbor, MI, USA.
Biorxiv : the Preprint Server for Biology
|July 29, 2024
Summary
Brain circuits form diverse connections using combinatorial wiring. This study reveals how insect Kenyon cells achieve this by accepting varied inputs, enabling complex sensory categorization.
Area of Science:
- Neuroscience
- Developmental Biology
- Computational Neuroscience
Background:
- The brain's ability to categorize vast amounts of information relies on expansion layer circuits.
- Combinatorial connections in these layers are crucial but their developmental mechanisms and in vivo occurrence are debated.
- Understanding how neurons achieve specific yet diverse wiring is key to brain function.
Purpose of the Study:
- Investigate how Kenyon cells, the insect mushroom body's expansion layer neurons, receive combinatorial input from olfactory projection neurons.
- Determine the role of Kenyon cell surface molecule expression in olfactory partner choice.
- Explore the generation of diverse neural connectivity patterns from limited genomic information.
Main Methods:
- Analysis of anatomic and transcriptional patterns in Kenyon cells and olfactory projection neurons.
- Perturbation of partner availability during neural development.
- Investigating the impact of cell surface molecule expression on synaptic partner selection.
Main Results:
- Olfactory projection neurons form orderly, predictable, and biased presynaptic outputs.
- Kenyon cells receive spatially co-located but molecularly heterogeneous inputs.
- Cell surface immunoglobulins are depleted in Kenyon cells, facilitating heterogeneous partner connections.
Conclusions:
- Kenyon cells acquire combinatorial input by accepting spatially aligned but molecularly diverse connections.
- Depletion of cell surface immunoglobulins in Kenyon cells is proposed as a mechanism for broad partner choice.
- This model explains how initially identical neurons develop distinct wiring identities, contributing to sensory processing.
