hnRNP A2/B1 is an RNA-binding protein that assembles into axonal RNA granules with Staufen2 (STAU2), mediating the long-range transport of mRNAs (including β-actin, Arp2/3, MAP1B) along microtubules in motor neuron axons. This hypothesis proposes that ALS-linked hnRNP A2/B1 dysfunction (mutations p.P193L, post-translational modification changes) disrupts axonal RNA granule transport, creating a dual defect: (1) insufficient delivery of structural and synaptic protein mRNAs to distal axons, and (2) accumulation of stalled RNA granules that obstruct axonal transport machinery and trigger dynein-mediated retrograde stress signaling.
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Curated pathway diagram from expert analysis
flowchart TD
A["HNRNPA2B1 Dysfunction
ALS Linked RBP Defect"]
B["STAU2 RNA Granule Assembly
Axonal Transport Complex"]
C["PRMT1 and GSK3B Modification
Granule Motility Control"]
D["MAP1B Beta Actin mRNAs
Distal Axon Cargo"]
E["Microtubule Transport Failure
Local Translation Deficit"]
F["Synaptic Protein Renewal Loss
NMJ Maintenance Failure"]
G["Distal Axon Degeneration
Motor Neuron Die Back"]
A --> B
C --> B
B --> D
D --> E
E --> F
F --> G
style A fill:#1a237e,stroke:#4fc3f7,color:#4fc3f7
style G fill:#b71c1c,stroke:#ef9a9a,color:#ef9a9a
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No clinical trials data available
Freshness score = exp(-age×ln2/5): halves every 5 years. Green >0.6, Amber 0.3–0.6, Red <0.3.
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No DepMap CRISPR Chronos data found for HNRNPA2B1,STAU2,PRMT1,GSK3B,MAP1B,β-actin,axonal transport machinery.
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