TIA1 (TIA-1) is an essential stress granule (SG) nucleator that undergoes oxidation-sensitive conformational changes in its low-complexity (LC) domain, modulating SG assembly dynamics. This hypothesis proposes that in ALS motor neurons, chronic oxidative stress (elevated ROS, mitochondrial dysfunction) causes irreversible oxidation of TIA1's LC domain cysteines, locking TIA1 into a hyper-assembly state that nucleates aberrant, gel-like SGs with altered material properties. These oxidized TIA1-SGs become detergent-insoluble, recruit TDP-43 through liquid-liquid phase separation (LLPS) co-partitioning, and seed cytoplasmic TDP-43 aggregation.
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Curated pathway diagram from expert analysis
flowchart TD
A["Mitochondrial ROS
ALS Oxidative Stress"]
B["TIA1 Low Complexity Domain Oxidation
Stress Granule Nucleator Locked"]
C["Gel Like Stress Granules
Reduced Dynamic Exchange"]
D["TDP43 Recruitment and Mislocalization
Cytoplasmic RBP Sink"]
E["RNA Translation Arrest
Repair mRNA Sequestration"]
F["Persistent Granule Pathology
Proteostasis Failure"]
G["Motor Neuron Degeneration
ALS Progression"]
A --> B
B --> C
C --> D
C --> E
D --> F
E --> G
F --> G
style B fill:#7b1fa2,stroke:#ce93d8,color:#ce93d8
style G fill:#b71c1c,stroke:#ef9a9a,color:#ef9a9a
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No DepMap CRISPR Chronos data found for TIA1,TDP-43,TARDBP,G3BP1,MAPK1,Oxidative stress response.
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