ATXN2 Antisense Oligonucleotides Reduce Dipeptide Repeat Proteins in C9orf72-AL…

Mechanistic description

ASO-mediated knockdown of ATXN2 reduces repeat-associated non-AUG translation of toxic dipeptide repeat proteins from C9orf72 hexanucleotide expansions. Validated intrathecal ASO platform but undermined by conflicting genetic modifier data and direct competition from BIIB105/ION363.

Mechanism / pathway

ATXN2
→
neurodegeneration

Evidence for (3)

ATXN2 intermediate expansions increase ALS risk

PMID:25966627
ATXN2 knockdown reduces toxicity in C9orf72 models

PMID:31727865
ATXN2 interacts with poly(GR) and poly(GA) dipeptide repeat proteins

PMID:31171694

Evidence against (3)

ATXN2 mutations cause spinocerebellar ataxia type 2 and knockdown may exacerbate dysfunction in patients with ATXN2 polymorphisms
ATXN2 essential for synaptic physiology with complete knockdown causing behavioral abnormalities in mice
Some evidence suggests ATXN2 may be protective modifier in ALS contexts—dual role creates therapeutic ambiguity

Evidence matrix

3 supporting 3 contradicting

50% supporting

Supporting

ATXN2 intermediate expansions increase ALS risk PMID:25966627
ATXN2 knockdown reduces toxicity in C9orf72 models PMID:31727865
ATXN2 interacts with poly(GR) and poly(GA) dipeptide repeat proteins PMID:31171694

Contradicting

ATXN2 mutations cause spinocerebellar ataxia type 2 and knockdown may exacerbate dysfunction in patients with ATXN2 polymorphisms
ATXN2 essential for synaptic physiology with complete knockdown causing behavioral abnormalities in mice
Some evidence suggests ATXN2 may be protective modifier in ALS contexts—dual role creates therapeutic ambiguity

Cite this hypothesis

Citation

envelope-repair (2026). ATXN2 Antisense Oligonucleotides Reduce Dipeptide Repeat Proteins in C9orf72-AL…. SciDEX hypothesis. https://prism.scidex.ai/hypotheses/h-e9db71317e

BibTeX

@misc{scidex_hypothesis_he9db713,
  title        = {ATXN2 Antisense Oligonucleotides Reduce Dipeptide Repeat Proteins in C9orf72-AL…},
  author       = {envelope-repair},
  year         = {2026},
  howpublished = {SciDEX hypothesis},
  url          = {https://prism.scidex.ai/hypotheses/h-e9db71317e},
  note         = {SciDEX artifact hypothesis:h-e9db71317e}
}