Risk genes in progressive supranuclear palsy (PSP) affect integrity and function of microtubules

Area of Science:

• Neuroscience
• Genetics
• Cell Biology

Background:

• Progressive supranuclear palsy (PSP) is a complex tauopathy with a significant genetic component.
• The precise roles of PSP risk genes in disease pathogenesis remain largely unknown.
• Previous research has primarily linked microtubule dysfunction to the MAPT gene in PSP.

Purpose of the Study:

• To identify novel pathological pathways associated with PSP risk genes.
• To investigate the functional targets and mechanisms of action for these risk genes.
• To elucidate the contribution of genetic factors to microtubule dysfunction in PSP.

Main Methods:

• Utilized publicly available databases for pathway and target identification.
• Analyzed the predicted functions and interactions of 15 known PSP risk genes.
• Focused on genes implicated in microtubule structure and function.

Main Results:

• Thirteen out of 15 PSP risk genes (including MAPT, LRRK2, APOE) were predicted to directly target microtubules.
• These genes influence microtubule homeostasis through mechanisms like vesicle transport and cellular export.
• Mutations in risk genes disrupt microtubule-dependent processes, including axonal transport and waste management.

Conclusions:

• Most PSP risk genes directly affect microtubule structure and function, extending beyond MAPT.
• Disruption of microtubule homeostasis is a key molecular driver of neuronal degeneration in PSP.
• These findings suggest a broader role for microtubule dysfunction in PSP pathogenesis, potentially impacting motor neurons.