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Homeodomain proteins hierarchically specify neuronal diversity and synaptic connectivity
Chundi Xu1, Tyler B Ramos1, Edward M Rogers2
1Institute of Neuroscience, Howard Hughes Medical Institute, University of Oregon, Eugene, United States.
Elife
|January 5, 2024
Summary
The brain-specific homeobox (Bsh) transcription factor generates diverse neuron types in the Drosophila visual system. This process links neuronal identity to circuit assembly and function.
Area of Science:
- Neuroscience
- Developmental Biology
- Genetics
Background:
- Neuronal diversity and circuit formation are fundamental to brain function but the underlying mechanisms remain poorly understood.
- Homeodomain transcription factors (HDTFs) play critical roles in cell fate determination during development.
Purpose of the Study:
- To investigate the role of the HDTF brain-specific homeobox (Bsh) in generating neuronal diversity within the Drosophila lamina.
- To elucidate how Bsh coordinates neuronal identity, circuit assembly, and synaptic connectivity.
Main Methods:
- Utilized Drosophila lamina neuron types (L1-L5) as a model system.
- Investigated the function of Bsh through knockdown experiments.
- Employed Bsh:Dam expression to identify direct Bsh targets.
Main Results:
- Bsh is essential for specifying L4/L5 neuron fates and repressing L1/L3 fates, thereby generating neuronal diversity.
- Bsh and Ap form a feed-forward loop to activate the synapse recognition molecule DIP-β in L4 neurons.
- Identified candidate L4 functional identity genes regulated by Bsh.
Conclusions:
- HDTFs function hierarchically to coordinate neuronal molecular identity, circuit formation, and function.
- Hierarchical HDTF regulation may be a conserved mechanism for linking neuronal diversity to circuit assembly and function.
Keywords:
D. melanogasterDIP-βdevelopmental biologyfeed-forward loophomeodomainlaminaneuronal diversitysynaptic connectivityMore Related Videos
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