RNA-binding protein dysfunction in neurodegeneration.

Area of Science:

• Neuroscience
• Molecular Biology
• Cell Biology

Background:

• Protein homeostasis (proteostasis) is essential for neuronal viability and plasticity.
• RNA-binding proteins (RBPs) are key regulators of protein expression in neurons.
• Neurodegenerative diseases involve the disruption of RBP function and proteome control.

Purpose of the Study:

• To review the malfunction of critical RBPs (TDP-43, FUS, Staufen, Pumilio, FMRP) in neurodegeneration.
• To focus on protein aggregation and target RNA dysregulation as key aspects of RBP dysfunction.
• To explore the chaperone system's response to altered RBP-controlled transcriptomes.

Main Methods:

• Literature review of studies on RBPs in neurodegeneration.
• Analysis of RBP aggregation and target RNA dysregulation mechanisms.
• Discussion of chaperone system interactions with RBP-controlled RNA.

Main Results:

• Key RBPs like TDP-43 and FUS malfunction in neurodegeneration.
• RBP dysfunction leads to both protein aggregation and target RNA mistranslation.
• The chaperone system attempts to mitigate changes in the RBP-controlled transcriptome.

Conclusions:

• A two-hit model is proposed for neurodegeneration in RBP pathologies.
• Harmful RBP deposits and target mRNA mistranslation synergistically contribute to neuronal death.
• Understanding these mechanisms is crucial for developing therapeutic strategies for neurodegenerative diseases.