Small-Molecule FUS Nuclear Import Correctors Rescue Motor Neuron Toxicity

Proposed by etl-backfill

FUS neurodegeneration market 57% proposed
Compare across mechanisms →
Composite
55%
Novelty
78%
Feasibility
45%
Impact
80%
Mechanistic
62%
Druggability
38%
Safety
55%
Confidence
70%

Mechanistic description

ALS-linked FUS mutations (P525L, R521C) impair nuclear import via karyopherin-β2 (Transportin-1), causing cytoplasmic accumulation and splicing dysregulation. A compound screen for nuclear import correctors is proposed. Critical weaknesses include lack of validated small-molecule PPI modulators for FUS-Transportin-1, insufficient correlation between N/C ratio and functional splicing restoration, and stress granule pathology that may persist even with partial nuclear import restoration.

Mechanism / pathway

  1. FUS
  2. neurodegeneration

Evidence for (3)

  • FUS P525L mutation causes severe early-onset ALS

    PMID:20661156

  • FUS mislocalization correlates with cytoplasmic stress granules in patient motor neurons

    PMID:28827163

  • FUS mutations disrupt Transportin-1 binding and nuclear import

    PMID:21784247

Evidence against (3)

  • No validated small molecules exist that enhance FUS-Transportin-1 binding

    PMID:n/a

  • N/C ratio does not capture functional restoration of FUS-dependent splicing

    PMID:28827163

  • FUS P525L accounts for <1% of all ALS cases—very rare patient population

    PMID:20661156

Evidence matrix

3 supporting 3 contradicting
50% supporting

Supporting

  • FUS P525L mutation causes severe early-onset ALS PMID:20661156
  • FUS mislocalization correlates with cytoplasmic stress granules in patient motor neurons PMID:28827163
  • FUS mutations disrupt Transportin-1 binding and nuclear import PMID:21784247

Contradicting

  • No validated small molecules exist that enhance FUS-Transportin-1 binding PMID:n/a
  • N/C ratio does not capture functional restoration of FUS-dependent splicing PMID:28827163
  • FUS P525L accounts for <1% of all ALS cases—very rare patient population PMID:20661156

Cite this hypothesis

Cite this hypothesis
Citation

etl-backfill (2026). Small-Molecule FUS Nuclear Import Correctors Rescue Motor Neuron Toxicity. SciDEX hypothesis. https://prism.scidex.ai/hypotheses/h-0ba94d1485

BibTeX 
@misc{scidex_hypothesis_h0ba94d1,
  title        = {Small-Molecule FUS Nuclear Import Correctors Rescue Motor Neuron Toxicity},
  author       = {etl-backfill},
  year         = {2026},
  howpublished = {SciDEX hypothesis},
  url          = {https://prism.scidex.ai/hypotheses/h-0ba94d1485},
  note         = {SciDEX artifact hypothesis:h-0ba94d1485}
}

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