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TDP-43 Oligomerization and Phase Separation Properties Are Necessary for Autoregulation.
Lydia C Koehler1, Zachary R Grese1, Alliny C S Bastos1
1Edward Doisy Department of Biochemistry and Molecular Biology, Saint Louis University, St. Louis, MO, United States.
Frontiers in Neuroscience
|May 2, 2022
Summary
TDP-43 RNA binding and phase separation are crucial for its own gene regulation. ALS-linked mutations disrupt these processes, impairing protein homeostasis and contributing to neurodegenerative diseases.
Area of Science:
- Neuroscience
- Molecular Biology
- Genetics
Background:
- TDP-43 protein aggregation is linked to amyotrophic lateral sclerosis (ALS) and frontotemporal dementia (FTD).
- TDP-43 autoregulation via its 3' UTR is critical for maintaining protein homeostasis and preventing pathology.
- Mechanisms underlying TDP-43 autoregulation and its link to disease remain unclear.
Purpose of the Study:
- To elucidate the mechanisms of TDP-43 autoregulation involving its own transcript.
- To investigate the role of RNA binding and phase separation in TDP-43 function and dysfunction.
- To determine how ALS-associated mutations affect TDP-43 autoregulation and protein homeostasis.
Main Methods:
- Investigated TDP-43 interactions with its 3' UTR RNA sequence.
- Analyzed TDP-43 phase separation, oligomerization, and condensation in cell lysates.
- Utilized CLIP-MS and phosphorylation analysis to study regulatory mechanisms.
- Examined the impact of ALS-associated TDP-43 mutations (M337V) and isoforms on condensate properties and cellular clearance.
Main Results:
- A specific RNA sequence in the TDP-43 3' UTR enhances liquid phase separation properties.
- TDP-43 binding to this RNA induces condensation, promoting the formation of dynamic ribonucleoprotein granules.
- TDP-43 oligomerization and phase separation are essential for its autoregulation, modulated by N-terminal phosphorylation.
- ALS-linked TDP-43 mutations (M337V) and a shortened isoform disrupt condensate liquid properties and autoregulation.
- M337V mutation impairs cellular clearance of TDP-43 and other ALS/FTD-associated RNA-binding proteins.
Conclusions:
- TDP-43 oligomerization and liquid-liquid phase separation driven by RNA binding are central to its autoregulation.
- Impairment of these phase separation dynamics by disease variants disrupts protein homeostasis.
- Cellular signaling pathways, like phosphorylation, may control TDP-43 phase separation and autoregulation.
- Understanding these mechanisms offers insights into TDP-43-related neurodegenerative diseases.
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