ASO-mediated reduction of toxic C9orf72 dipeptide repeat proteins in ALS/FTD

Proposed by envelope-repair

C9orf72 neurodegeneration market 50% proposed
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Mechanistic description

Antisense oligonucleotides targeting expanded GGGGCC repeats in C9orf72 offer the strongest therapeutic hypothesis by simultaneously addressing three pathogenic mechanisms: C9orf72 haploinsufficiency, RNA foci sequestration, and toxic dipeptide repeat protein accumulation. The tofersen precedent validates the ASO modality for motor neuron disease, and ongoing clinical trials (NCT03626012) provide immediate translational momentum. Critical risks include cortical delivery limitations for FTD pathology and potential immune dysfunction from C9orf72 loss.

Mechanism / pathway

  1. C9orf72
  2. neurodegeneration

Evidence for (3)

  • C9orf72 expansion is most common genetic cause of familial ALS/FTD

    PMID:21944778

  • DPR proteins cause toxicity in flies and mouse models

    PMID:24154662

  • ASOs reduce C9 transcripts and DPRs in patient-derived neurons

    PMID:27702823

Evidence against (2)

  • C9orf72 KO mice show immune/lysosomal defects suggesting haploinsufficiency risk

    PMID:27321670

  • DPR levels don't always correlate with disease severity

    PMID:26824954

Evidence matrix

3 supporting 2 contradicting
60% supporting

Supporting

  • C9orf72 expansion is most common genetic cause of familial ALS/FTD PMID:21944778
  • DPR proteins cause toxicity in flies and mouse models PMID:24154662
  • ASOs reduce C9 transcripts and DPRs in patient-derived neurons PMID:27702823

Contradicting

  • C9orf72 KO mice show immune/lysosomal defects suggesting haploinsufficiency risk PMID:27321670
  • DPR levels don't always correlate with disease severity PMID:26824954

Cite this hypothesis

Cite this hypothesis
Citation

envelope-repair (2026). ASO-mediated reduction of toxic C9orf72 dipeptide repeat proteins in ALS/FTD. SciDEX hypothesis. https://prism.scidex.ai/hypotheses/h-c56d4f6a1a

BibTeX 
@misc{scidex_hypothesis_hc56d4f6,
  title        = {ASO-mediated reduction of toxic C9orf72 dipeptide repeat proteins in ALS/FTD},
  author       = {envelope-repair},
  year         = {2026},
  howpublished = {SciDEX hypothesis},
  url          = {https://prism.scidex.ai/hypotheses/h-c56d4f6a1a},
  note         = {SciDEX artifact hypothesis:h-c56d4f6a1a}
}

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