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Published on: May 12, 2015
MECP2 impairs neuronal structure by regulating KIBRA
Alison A Williams1, Robin White2, Ashley Siniard3
1School of Life Sciences, Arizona State University, Tempe, AZ 85287, USA; Institute of Zoology- Neurobiology, Johannes Gutenberg University Mainz, 55128, Germany.
Abstract:
Using a Drosophila model of MECP2 gain-of-function, we identified memory associated KIBRA as a target of MECP2 in regulating dendritic growth. We found that expression of human MECP2 increased kibra expression in Drosophila, and targeted RNAi knockdown of kibra in identified neurons fully rescued dendritic defects as induced by MECP2 gain-of-function. Validation in mouse confirmed that Kibra is similarly regulated by Mecp2 in a mammalian system. We found that Mecp2 gain-of-function in cultured mouse cortical neurons caused dendritic impairments and increased Kibra levels. Accordingly, Mecp2 loss-of-function in vivo led to decreased Kibra levels in hippocampus, cortex, and cerebellum. Together, our results functionally link two neuronal genes of high interest in human health and disease and highlight the translational utility of the Drosophila model for understanding MECP2 function.
Insights
Methyl-CpG-binding protein 2 (MECP2) regulates dendritic growth by targeting KIBRA. This study demonstrates MECP2
Area of Science:
- Neuroscience
- Molecular Biology
- Genetics
Background:
- MECP2 (Methyl-CpG-binding protein 2) is crucial for neuronal development and function.
- KIBRA is implicated in memory and synaptic plasticity.
- Dysregulation of MECP2 is linked to neurodevelopmental disorders.
Purpose of the Study:
- To investigate the role of MECP2 in regulating dendritic growth.
- To identify downstream targets of MECP2 involved in neuronal development.
- To explore the functional link between MECP2 and KIBRA.
Main Methods:
- Drosophila melanogaster model of MECP2 gain-of-function.
- RNA interference (RNAi) for targeted gene knockdown.
- Primary mouse cortical neuron culture.
- In vivo studies in mice.
Main Results:
- MECP2 gain-of-function in Drosophila increased KIBRA expression and caused dendritic defects.
- Knockdown of KIBRA in Drosophila fully rescued MECP2-induced dendritic defects.
- MECP2 gain-of-function in mouse neurons increased KIBRA levels and impaired dendrites.
- MECP2 loss-of-function in mice decreased KIBRA levels in multiple brain regions.
Conclusions:
- KIBRA is a direct target of MECP2 in regulating dendritic growth.
- The MECP2-KIBRA interaction is conserved across species (Drosophila and mouse).
- This study highlights the utility of Drosophila as a model for MECP2 research and identifies a novel molecular pathway relevant to neurodevelopmental disorders.
