TDP-43 phase-separation and nuclear-function failure in ALS/FTD

Mechanistic description

Pathological TDP-43 condensate dynamics, phosphorylation, aggregation, and nuclear depletion disrupt RNA processing in ALS/FTD. The strongest therapeutic version is not generic LLPS modulation but restoration of nuclear TDP-43 function, cryptic-exon repression, stress-granule resolution, and neuronal survival in human-relevant models.

Mechanism / pathway

TARDBP; TIA1
→
neurodegeneration

Evidence for (4)

TDP-43 pathology is present in most ALS cases and many FTD cases, giving the mechanism strong disease relevance.

PMID:29238078
ALS-linked TARDBP mutations alter phase-separation and aggregation properties.

PMID:28453719
Patient-derived motor neurons show stress-granule and TDP-43-related abnormalities relevant to therapeutic testing.

PMID:31542276
Cryptic-exon biomarkers provide a plausible pharmacodynamic readout for TDP-43 loss of nuclear function.

PMID:38278991

Evidence against (2)

TDP-43 inclusions may be late-stage correlates, and LLPS changes may not be the rate-limiting toxic mechanism compared with cryptic splicing, RNA transport, mitochondrial effects, or cytoplasmic toxicity.

PMID:29238078
Restoring liquid-like condensate behavior alone may fail if nuclear localization, cryptic-exon repression, neuronal survival, or axonal RNA transport are not rescued.

PMID:28453719

Evidence matrix

4 supporting 2 contradicting

67% supporting

Supporting

TDP-43 pathology is present in most ALS cases and many FTD cases, giving the mechanism strong disease relevance. PMID:29238078
ALS-linked TARDBP mutations alter phase-separation and aggregation properties. PMID:28453719
Patient-derived motor neurons show stress-granule and TDP-43-related abnormalities relevant to therapeutic testing. PMID:31542276
Cryptic-exon biomarkers provide a plausible pharmacodynamic readout for TDP-43 loss of nuclear function. PMID:38278991

Contradicting

TDP-43 inclusions may be late-stage correlates, and LLPS changes may not be the rate-limiting toxic mechanism compared with cryptic splicing, RNA transport, mitochondrial effects, or cytoplasmic toxicity. PMID:29238078
Restoring liquid-like condensate behavior alone may fail if nuclear localization, cryptic-exon repression, neuronal survival, or axonal RNA transport are not rescued. PMID:28453719

Cite this hypothesis

Citation

envelope-repair (2026). TDP-43 phase-separation and nuclear-function failure in ALS/FTD. SciDEX hypothesis. https://prism.scidex.ai/hypotheses/h-bf2e53d730

BibTeX

@misc{scidex_hypothesis_hbf2e53d,
  title        = {TDP-43 phase-separation and nuclear-function failure in ALS/FTD},
  author       = {envelope-repair},
  year         = {2026},
  howpublished = {SciDEX hypothesis},
  url          = {https://prism.scidex.ai/hypotheses/h-bf2e53d730},
  note         = {SciDEX artifact hypothesis:h-bf2e53d730}
}