The Regulation of TDP-43 Structure and Phase Transitions: A Review.

Area of Science:

• Neuroscience
• Molecular Biology
• Biochemistry

Background:

• TDP-43 is crucial for RNA processing, transport, and stress granule assembly.
• Cytoplasmic inclusions of TDP-43 are hallmarks of amyotrophic lateral sclerosis (ALS) and frontotemporal dementia (FTD).
• Both TDP-43 aggregation and loss of nuclear function contribute to disease pathology.

Purpose of the Study:

• To review recent advances in the structural characterization of TDP-43.
• To explore the phase transition mechanisms of TDP-43.
• To discuss factors influencing TDP-43 pathological transformations and potential therapeutic strategies.

Main Methods:

• Literature review focusing on structural characterization and phase transition studies of TDP-43.
• Analysis of research on genetic mutations, post-translational modifications, and stressors affecting TDP-43.
• Evaluation of current regulators of TDP-43 phase separation and aggregation.

Main Results:

• TDP-43 undergoes phase transitions from monomers to liquid and solid condensates, and eventually to amyloid fibrils.
• Disease-associated mutations, PTMs, and stressors can drive these pathological transitions.
• Dysregulation of TDP-43 condensates alters protein function and promotes aggregation.

Conclusions:

• Understanding TDP-43 structural dynamics and phase transition is critical for elucidating disease mechanisms.
• Targeting TDP-43 phase separation and aggregation offers potential therapeutic avenues for ALS and FTD.
• Further research into TDP-43 regulation is needed to develop effective treatments.