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Hormone-controlled changes in the differentiation state of post-mitotic neurons
Yen-Wei Lai1, Rosa L Miyares2, Ling-Yu Liu2
1Institute of Cellular and Organismic Biology, Academia Sinica, Academia Road, Taipei 11529, Taiwan; Institute of Molecular and Cellular Biology, College of Life Science, National Taiwan University, Roosevelt Road, Taipei 10617, Taiwan.
Current Biology : CB
|May 4, 2022
Summary
The broad-complex, tramtrack, and bric-à-brac/poxvirus and zinc finger (BTB/POZ) transcription factor Mamo plays a crucial role in specifying neuronal identity in adult fly brains. Mamo ensures Kenyon cells maintain correct subtype-specific gene expression after metamorphosis.
Area of Science:
- Neuroscience
- Developmental Biology
- Genetics
Background:
- Neurons exhibit plasticity, with metamorphosis inducing significant brain changes in flies.
- The steroid hormone ecdysone drives neuronal remodeling and alters differentiation status during metamorphosis.
- Mushroom body Kenyon cells (γ, α'/β', α/β) are a model for temporal cell fate specification and remodeling.
Purpose of the Study:
- To investigate the role of the Mamo transcription factor in γ neuron remodeling and fate specification during fly brain metamorphosis.
- To clarify the precise function of Mamo in ensuring adult Kenyon cell subtype identity.
Main Methods:
- Analysis of Mamo's expression timing relative to γ neuron specification.
- Observation of changes in adult Kenyon cell subtype markers following Mamo manipulation.
- Investigating Mamo's role in γ neuron remodeling and fate specification.
Main Results:
- Mamo is essential for γ neuron remodeling during metamorphosis.
- Mamo manipulation alters the number of adult Kenyon cells expressing γ-specific markers.
- Mamo is expressed in γ neurons after specification, indicating a role in maintaining adult identity.
Conclusions:
- Mamo has a critical role in γ neuron remodeling.
- Mamo is required for specifying the correct Kenyon cell subtype identity in the adult brain.
- Mamo acts later in development to ensure subtype-specific gene expression in mature neurons.
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