The tau mutation (val337met) disrupts cytoskeletal networks of microtubules

Area of Science:

• Neuroscience
• Cell Biology
• Genetics

Background:

• Frontotemporal dementia with parkinsonism linked to chromosome 17 (FTDP-17) is associated with mutations in the tau gene.
• The tau protein plays a crucial role in microtubule stabilization within neurons.

Purpose of the Study:

• To investigate the cellular effects of a specific tau gene mutation (valine337-methionine) linked to FTDP-17.
• To elucidate the impact of this tau mutation on cellular structure, particularly microtubule networks.

Main Methods:

• Confocal microscopy was used to analyze cells expressing either wild-type or mutated tau cDNA.
• Cellular morphology, including cell processes and microtubule organization, was examined.

Main Results:

• Introduction of wild-type tau cDNA induced extensive cell processes and robust microtubule bundles.
• Cells expressing the mutated tau cDNA exhibited loss of cell processes and disrupted microtubule networks, resulting in a more rounded cell shape.
• Mitochondria and endoplasmic reticulum remained intact in cells with the mutated tau.

Conclusions:

• The tau mutation (valine337-methionine) directly disrupts microtubule organization.
• Microtubule disruption by the tau mutation leads to a loss of cellular organization and function.
• The findings highlight the critical role of tau in maintaining cellular architecture and neuronal health.