DCPS modulates TDP-43-linked neurodegeneration through P-body-mediated RNA decay

Area of Science:

• Neurobiology
• Molecular Biology
• Genetics

Background:

• TDP-43 proteinopathy is central to neurodegenerative diseases like ALS, FTD, and AD.
• This proteinopathy involves TDP-43 moving from the nucleus to the cytoplasm, forming inclusions.

Purpose of the Study:

• To identify genetic modifiers of TDP-43 loss-of-function (LOF) neurotoxicity.
• To elucidate the role of TDP-43 in RNA processing and P-body regulation.

Main Methods:

• CRISPR interference (CRISPRi) screening in human neurons.
• Analysis of TDP-43 interactions with P-body components and RNA degradation pathways.

Main Results:

• Decapping scavenger enzyme (DCPS) identified as a modifier of TDP-43 LOF neurotoxicity.
• TDP-43 LOF dysregulates P-bodies, leading to aberrant mRNA degradation.
• Reducing DCPS function restored P-body integrity and improved neuronal survival.

Conclusions:

• TDP-43 plays a critical role in regulating RNA processing via P-body dynamics.
• DCPS is a novel therapeutic target for neurodegenerative diseases associated with TDP-43 proteinopathy.