Microtubule defects & Neurodegeneration.

Area of Science:

• Neuroscience
• Cell Biology
• Genetics

Background:

• Long-term neuronal survival requires efficient axonal transport over long distances.
• Aging and genetic mutations can impair neuronal transport machinery, contributing to neurodegenerative diseases.
• Microtubules (MTs) form the scaffolding for axonal transport, and their stability is crucial for neuron health.

Purpose of the Study:

• To review neurodegenerative conditions linked to impaired MT stability and axonal transport.
• To emphasize the central role of MTs in neuronal survival.
• To explore the complex genetics of idiopathic neurodegenerative diseases.

Main Methods:

• Review of existing literature on neurodegenerative diseases, MT dynamics, and axonal transport.
• Examination of genetic mutations affecting neuronal transport proteins.
• Analysis of post-translational modifications of tubulin, such as polyglutamylation.

Main Results:

• Mutations in transport system genes are implicated in neurological disorders.
• Tau protein's role in MT stabilization is critical; its dysfunction is seen in Alzheimer's disease and tauopathies.
• Defects in tubulin post-translational modification, like polyglutamylation, severely impact MTs and neuronal survival, as shown in the 'pcd' mouse model.

Conclusions:

• MT stability and axonal transport are fundamental to neuron survival.
• Dysregulation of MT dynamics and transport contributes to aging-related neurodegeneration.
• Understanding MTs' role is key to addressing complex neurodegenerative diseases.