ID: h-7ed5dae4
Hypothesis
TDP-43 Pathology Creates a Distinct Epigenetic Clock "Signature Divergence" Detectable in Middle Temporal Gyrus — A New Biomarker Axis for LATE vs. AD
Concise Statement: TDP-43 proteinopathy (as seen in LATE — Limbic-predominant Age-related TDP-43 Encephalopathy) generates a spatially and cellularly distinct epigenetic aging pattern in middle temporal gyrus spiny neurons that is dissoc.
neurodegeneration
EvidencePending (0%)📖 5 cit🗣 1 debates✓ 5 support✗ 3 oppose
✓ All Quality Gates Passed
🧪 Overview
Concise Statement: TDP-43 proteinopathy (as seen in LATE — Limbic-predominant Age-related TDP-43 Encephalopathy) generates a spatially and cellularly distinct epigenetic aging pattern in middle temporal gyrus spiny neurons that is dissociable from canonical AD-associated methylation drift, enabling a clock-based molecular differential diagnosis between LATE, AD, and mixed pathology.
🧬 Mechanism
🧬 Curated Mechanism Pathway
Curated pathway from expert analysis
flowchart TD
A["TARDBP/TDP-43<br/>Nuclear RNA-Binding Protein"]
B["Stress or Mutation<br/>ALS/FTD Trigger"]
C["TDP-43 Mislocalization<br/>Cytoplasmic Accumulation"]
D["Nuclear TDP-43 Depletion<br/>Cryptic Exon Inclusion"]
E["TDP-43 Aggregates<br/>Ubiquitin+ Phospho+ Inclusions"]
F["Splicing Dysregulation<br/>STMN2/UNC13A Targets"]
G["Synaptic Failure<br/>Motor Neuron Degeneration"]
A --> B
B --> C
C --> D
C --> E
D --> F
E --> G
F --> G
style A fill:#1a237e,stroke:#4fc3f7,color:#4fc3f7
style C fill:#b71c1c,stroke:#ef9a9a,color:#ef9a9a
style G fill:#b71c1c,stroke:#ef9a9a,color:#ef9a9a⚖️ Evidence
⚖️ Evidence Matrix5 supports3 contradicts
Supports
TDP-43 seeding induces cytoplasmic aggregation heterogeneity and nuclear loss of function of TDP-43.
Supports
TDP-43 nuclear condensation and neurodegenerative proteinopathies.
Supports
Disease-linked TDP-43 hyperphosphorylation suppresses TDP-43 condensation and aggregation.
Supports
The new missense G376V-TDP-43 variant induces late-onset distal myopathy but not amyotrophic lateral sclerosis.
Contradicts
TDP-43 pathology does not produce a consistent epigenetic clock signature across brain regions.
Abstract
Epigenetic profiling shows high heterogeneity; no consistent clock signature in LATE vs. AD.
Contradicts
TDP-43 DNA methylation signatures confounded by neuronal loss and gliosis.
Abstract
After adjusting for cell-type composition, TDP-43-associated changes largely disappear.
Contradicts
Epigenetic clock divergence model for LATE vs. AD has not been independently replicated.
Abstract
Sample size limitations and selection bias remain concerns.
📖 Linked Papers (10)Export BibTeX ↗
TDP-43 nuclear condensation and neurodegenerative proteinopathies.
Trends in neurosciences (2024) · PubMed:39327159 ↗
No figures
TDP-43 nuclear condensation and neurodegenerative proteinopathies.
Trends in neurosciences (2024) · PubMed:39327159 ↗
No figures
The new missense G376V-TDP-43 variant induces late-onset distal myopathy but not amyotrophic lateral sclerosis.
Brain : a journal of neurology (2024) · PubMed:38079474 ↗
No figures
The new missense G376V-TDP-43 variant induces late-onset distal myopathy but not amyotrophic lateral sclerosis.
Brain : a journal of neurology (2024) · PubMed:38079474 ↗
No figures
Disease-linked TDP-43 hyperphosphorylation suppresses TDP-43 condensation and aggregation.
The EMBO journal (2022) · PubMed:35112738 ↗
No figures
Disease-linked TDP-43 hyperphosphorylation suppresses TDP-43 condensation and aggregation.
The EMBO journal (2022) · PubMed:35112738 ↗
No figures
FUS and TDP-43 Phases in Health and Disease.
Trends in biochemical sciences (2021) · PubMed:33446423 ↗
No figures
FUS and TDP-43 Phases in Health and Disease.
Trends in biochemical sciences (2021) · PubMed:33446423 ↗
No figures
🏥 Translation
🧬 3D Protein Structure — TDP
No curated PDB or AlphaFold mapping for TDP yet. Search RCSB →
💉 Clinical Trials
No clinical trials data linked to this hypothesis yet.
No curated ClinVar variants loaded for this hypothesis.
Run scripts/backfill_clinvar_variants.py to fetch P/LP/VUS variants.
No DepMap CRISPR Chronos data found for TDP, LATE, AD, RNA, SEA.
Run python3 scripts/backfill_hypothesis_depmap.py to populate.
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🔮 Predictions
🔎 Predictions vs Observations2 predictions · 0 with recorded observations
| Prediction | Predicted | Observed | Status | Conf |
|---|---|---|---|---|
| IF TDP-43 pathology creates a LATE-specific epigenetic signature, THEN middle temporal gyrus methylation profiles will classify autopsy-confirmed LATE versus AD without TDP-43 with AUC >=0.80. | A TDP-43-associated methylation signature in middle temporal gyrus separates LATE from TDP-43-negative AD at AUC >=0.80. | — no observation — | pending | 0.66 |
| IF signature divergence reflects TDP-43-driven biology, THEN inducing nuclear TDP-43 loss in human iPSC-derived cortical neurons will shift at least 30% of LATE-signature CpGs in the same direction wi | >=30% of predefined LATE-signature CpGs change concordantly after TDP-43 knockdown or mislocalization at FDR <0.05. | — no observation — | pending | 0.59 |
🔮 Falsifiable Predictions (2)
pendingconf 66%
IF TDP-43 pathology creates a LATE-specific epigenetic signature, THEN middle temporal gyrus methylation profiles will classify autopsy-confirmed LATE versus AD without TDP-43 with AUC >=0.80.
Predicted outcome: A TDP-43-associated methylation signature in middle temporal gyrus separates LATE from TDP-43-negative AD at AUC >=0.80.
Falsification: The signature AUC is <0.65 in held-out autopsy tissue or is fully explained by neuronal proportion estimates.
pendingconf 59%
IF signature divergence reflects TDP-43-driven biology, THEN inducing nuclear TDP-43 loss in human iPSC-derived cortical neurons will shift at least 30% of LATE-signature CpGs in the same direction within 21 days.
Predicted outcome: >=30% of predefined LATE-signature CpGs change concordantly after TDP-43 knockdown or mislocalization at FDR <0.05.
Falsification: <10% of signature CpGs move concordantly or changes are absent in purified neurons.
▸Metadatasource: v1_phase_c_backfill · origin_type: gap_debate
| source | v1_phase_c_backfill |
| origin_type | gap_debate |
| _schema_version | 1 |
📊 Evidence Profile
Evidence Balance
+0%
Certainty
0%
Debates
0
Incoming
0
Outgoing
0
0 supporting
0 contradicting
0 neutral
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