Which of the three proposed C9orf72 mechanisms (haploinsufficiency, RNA toxicity, or dipeptide toxicity) is the primary driver of neurodegeneration?

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Composite

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Novelty

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Mechanistic

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Druggability

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Priority

85%

Importance

92%

Tractability

75%

Market price

50%

Description

The abstract presents three competing molecular mechanisms but states the exact mechanisms have not been elucidated. Determining the primary pathogenic mechanism is critical for developing targeted therapeutics and understanding disease progression.

Gap type: open_question Source paper: Molecular Mechanisms of Neurodegeneration Related to (2019, Behavioural neurology, PMID:30774737)

Resolution criteria

Resolution requires: (1) Allele-specific rescue experiments in iPSC-derived neurons or animal models testing each mechanism independently (C9orf72 overexpression for haploinsufficiency, ASO for RNA foci,萝卜素 for dipeptides), with >=2 mutations per mechanism; (2) Biomarker correlation studies measuring each mechanism’s contribution to neurotoxicity in patient samples, with quantitative threshold for primary driver status (>=30% variance explained); (3) Temporal ordering experiments in a relevant animal model establishing which mechanism precedes neurodegeneration onset by >=4 weeks. Single-mechanism interventions without comparing all three are insufficient.

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