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Published on: August 21, 2014
MiR-92 Controls Synaptic Development Through Glial Vha55 Regulation
Simon M Moe1, Alicia Taylor1, Alan P Robertson2
1Program in Neuroscience, Department of Food Science and Human Nutrition, Iowa State University, Ames, IA 50010, USA.
Abstract:
MicroRNAs (miRNAs) have emerged as important biomarkers for complex neurological conditions. Modifications in synaptic morphology characterize several of these disease states, indicating a possible role of miRNA in modulating synaptic formation and plasticity. Within the third-instar larvae of Drosophila melanogaster, we uncovered a functional role for highly human-conserved miR-92 in synaptogenesis of the glutamatergic peripheral nervous system. Loss of miR-92 results in underdeveloped synaptic architecture, coinciding with significantly reduced physiological activity. We demonstrate a novel role for miR-92 glial-specific expression to support synaptic growth function and plasticity. Modifications of miR-92 within glial tissue result in aberrant glial barrier properties, including an increased uptake of external dyes. Within the glia, miR-92 regulates a V-ATPase subunit (Vha55), impairing the glial cells from forming appropriate insulating layers around the nervous system. These modifications may impact how the nervous system adapts to its environment, increasing immature 'ghost bouton' budding and impairing responses to changes in environmental conditions. Our work highlights the importance of glial-specific miR-92 on synaptic development, affecting glial health and function through its downstream target Vha55, and demonstrates a novel mechanism for glia in synaptogenesis and homeostatic plasticity.
Insights
MicroRNAs (miRNAs) are key biomarkers for neurological conditions. Glial-specific miR-92 is crucial for synaptic development and plasticity by regulating Vha55 in Drosophila.
Area of Science:
- Neuroscience
- Molecular Biology
- Genetics
Background:
- MicroRNAs (miRNAs) are increasingly recognized as biomarkers for neurological disorders.
- Synaptic morphology alterations are common in neurological diseases, suggesting a role for miRNAs in synaptic plasticity and formation.
Purpose of the Study:
- To investigate the role of the highly conserved miR-92 in synaptogenesis within the Drosophila melanogaster peripheral nervous system.
- To elucidate the function of glial-specific miR-92 in supporting synaptic growth and plasticity.
Main Methods:
- Utilized Drosophila melanogaster third-instar larvae as a model system.
- Examined the effects of miR-92 loss on synaptic architecture and physiological activity.
- Investigated miR-92's role in glial barrier properties and its regulation of the V-ATPase subunit Vha55.
Main Results:
- Loss of miR-92 led to underdeveloped synaptic architecture and reduced physiological activity.
- Glial-specific miR-92 is essential for synaptic growth and plasticity.
- miR-92 regulates Vha55 in glia, affecting glial barrier function and insulation of the nervous system.
- Dysregulation of miR-92 in glia resulted in increased 'ghost bouton' formation and impaired environmental adaptation.
Conclusions:
- Glial-specific miR-92 plays a vital role in synaptic development and homeostatic plasticity.
- miR-92 influences glial health and function through its target Vha55, impacting nervous system insulation.
- This study reveals a novel mechanism by which glia contribute to synaptogenesis and plasticity.
