Systematic Analysis of Transmitter Coexpression Reveals Organizing Principles of Local Interneuron Heterogeneity
Kristyn M Lizbinski1, Gary Marsat1, Andrew M Dacks1
1Department of Biology, West Virginia University, Morgantown, WV 26505.
Eneuro
|October 9, 2018
Summary
Olfactory local interneurons (LNs) in moths show diverse transmitter coexpression, challenging simple subclass definitions. Computational models reveal specific organizing principles governing this complex neuronal communication.
Area of Science:
- Neuroscience
- Olfactory system research
- Insect neurobiology
Background:
- Neuronal classes exhibit heterogeneity, with overlapping traits like transmitter coexpression.
- The consistency and predictability of transmitter coexpression patterns remain largely unknown.
Purpose of the Study:
- To investigate the extent of predictable, consistent patterns in transmitter coexpression.
- To analyze pairwise coexpression of GABA and neuropeptides in olfactory local interneurons (LNs).
Main Methods:
- Experimental analysis of neuropeptide coexpression in Manduca sexta LNs.
- Computational modeling to assess expression probabilities and identify organizing principles.
Main Results:
- Pairwise coexpression of GABA and multiple neuropeptide families in LNs is highly heterogeneous.
- Computational modeling identified three key organizing principles: GABA coexpression likelihood, allatotropin dependency on myoinhibitory peptide, and tachykinin's all-or-none patterns.
- Receptor expression for all studied modulators in principal neurons suggests broad influence of LNs.
Conclusions:
- The stochastic nature of coexpression highlights LN transmitter content heterogeneity, arguing against simple subpopulation definitions.
- LN activation releases a dynamic cocktail of modulators influencing all levels of olfactory processing in the antennal lobe (AL).
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