What are the specific molecular determinants that govern tau strain selection during prion-like propagation?¶
Notebook ID: nb-SDA-2026-04-15-gap-debate-20260410-112730-24052bbe · Analysis: SDA-2026-04-15-gap-debate-20260410-112730-24052bbe · Generated: 2026-04-21T18:43:27
Research question¶
The debate highlighted tau prion-like transmission but did not resolve how different tau conformations compete and which structural features determine propagation efficiency. Understanding these determinants is critical for predicting disease progression patterns.
Source: Debate session sess_SDA-2026-04-02-gap-tau-propagation-20260402 (Analysis: SDA-2026-04-02-gap-tau-propagation-20260402)
Approach¶
This notebook is generated programmatically from real Forge tool calls and SciDEX debate data. Forge tools used: PubMed Search, MyGene, STRING PPI, Reactome pathways, Enrichr.
Debate Summary¶
Quality score: 0.57 · Rounds: 4
1. Target gene annotations (MyGene)¶
import pandas as pd
ann_rows = [{'gene': 'APOE', 'name': 'apolipoprotein E', 'summary': 'The protein encoded by this gene is a major apoprotein of the chylomicron. It binds to a specific liver and peripheral c'}, {'gene': 'GPC4', 'name': 'glypican 4', 'summary': 'Cell surface heparan sulfate proteoglycans are composed of a membrane-associated protein core substituted with a variabl'}, {'gene': 'TREM2', 'name': 'triggering receptor expressed on myeloid cells 2', 'summary': 'This gene encodes a membrane protein that forms a receptor signaling complex with the TYRO protein tyrosine kinase bindi'}]
pd.DataFrame(ann_rows)
| gene | name | summary | |
|---|---|---|---|
| 0 | APOE | apolipoprotein E | The protein encoded by this gene is a major ap... |
| 1 | GPC4 | glypican 4 | Cell surface heparan sulfate proteoglycans are... |
| 2 | TREM2 | triggering receptor expressed on myeloid cells 2 | This gene encodes a membrane protein that form... |
2. GO Biological Process enrichment (Enrichr)¶
go_bp = [{'rank': 1, 'term': 'Leukocyte Apoptotic Process (GO:0071887)', 'p_value': 0.0004999362185987752, 'odds_ratio': 4998.5, 'genes': ['HCAR2']}, {'rank': 2, 'term': 'Regulation Of Adiponectin Secretion (GO:0070163)', 'p_value': 0.000599909243874975, 'odds_ratio': 3998.6, 'genes': ['HCAR2']}, {'rank': 3, 'term': 'Positive Regulation Of Myeloid Cell Apoptotic Process (GO:0033034)', 'p_value': 0.0006998773712248138, 'odds_ratio': 3332.0, 'genes': ['HCAR2']}, {'rank': 4, 'term': 'Glucosamine-Containing Compound Catabolic Process (GO:1901072)', 'p_value': 0.0007998405838081707, 'odds_ratio': 2855.8571428571427, 'genes': ['CHI3L1']}, {'rank': 5, 'term': 'Positive Regulation Of Leukocyte Apoptotic Process (GO:2000108)', 'p_value': 0.0008997988691311835, 'odds_ratio': 2498.75, 'genes': ['HCAR2']}, {'rank': 6, 'term': 'Activation Of NF-kappaB-inducing Kinase Activity (GO:0007250)', 'p_value': 0.0014994446955652384, 'odds_ratio': 1427.4285714285713, 'genes': ['CHI3L1']}, {'rank': 7, 'term': 'Negative Regulation Of Lipid Catabolic Process (GO:0050995)', 'p_value': 0.0017992006270532422, 'odds_ratio': 1175.3529411764705, 'genes': ['HCAR2']}, {'rank': 8, 'term': 'Positive Regulation Of Hormone Secretion (GO:0046887)', 'p_value': 0.001899109329170248, 'odds_ratio': 1110.0, 'genes': ['HCAR2']}, {'rank': 9, 'term': 'Regulation Of Lipid Catabolic Process (GO:0050994)', 'p_value': 0.0022986943824153676, 'odds_ratio': 908.0, 'genes': ['HCAR2']}, {'rank': 10, 'term': 'Positive Regulation Of Peptidyl-Threonine Phosphorylation (GO:0010800)', 'p_value': 0.00239857819994348, 'odds_ratio': 868.4782608695652, 'genes': ['CHI3L1']}]
go_df = pd.DataFrame(go_bp)[['term','p_value','odds_ratio','genes']]
go_df['p_value'] = go_df['p_value'].apply(lambda p: f'{p:.2e}')
go_df['odds_ratio'] = go_df['odds_ratio'].round(1)
go_df['term'] = go_df['term'].str[:60]
go_df['n_hits'] = go_df['genes'].apply(len)
go_df['genes'] = go_df['genes'].apply(lambda g: ', '.join(g))
go_df[['term','n_hits','p_value','odds_ratio','genes']]
| term | n_hits | p_value | odds_ratio | genes | |
|---|---|---|---|---|---|
| 0 | Leukocyte Apoptotic Process (GO:0071887) | 1 | 5.00e-04 | 4998.5 | HCAR2 |
| 1 | Regulation Of Adiponectin Secretion (GO:0070163) | 1 | 6.00e-04 | 3998.6 | HCAR2 |
| 2 | Positive Regulation Of Myeloid Cell Apoptotic ... | 1 | 7.00e-04 | 3332.0 | HCAR2 |
| 3 | Glucosamine-Containing Compound Catabolic Proc... | 1 | 8.00e-04 | 2855.9 | CHI3L1 |
| 4 | Positive Regulation Of Leukocyte Apoptotic Pro... | 1 | 9.00e-04 | 2498.8 | HCAR2 |
| 5 | Activation Of NF-kappaB-inducing Kinase Activi... | 1 | 1.50e-03 | 1427.4 | CHI3L1 |
| 6 | Negative Regulation Of Lipid Catabolic Process... | 1 | 1.80e-03 | 1175.4 | HCAR2 |
| 7 | Positive Regulation Of Hormone Secretion (GO:0... | 1 | 1.90e-03 | 1110.0 | HCAR2 |
| 8 | Regulation Of Lipid Catabolic Process (GO:0050... | 1 | 2.30e-03 | 908.0 | HCAR2 |
| 9 | Positive Regulation Of Peptidyl-Threonine Phos... | 1 | 2.40e-03 | 868.5 | CHI3L1 |
import matplotlib.pyplot as plt
import numpy as np
go_bp = [{'rank': 1, 'term': 'Leukocyte Apoptotic Process (GO:0071887)', 'p_value': 0.0004999362185987752, 'odds_ratio': 4998.5, 'genes': ['HCAR2']}, {'rank': 2, 'term': 'Regulation Of Adiponectin Secretion (GO:0070163)', 'p_value': 0.000599909243874975, 'odds_ratio': 3998.6, 'genes': ['HCAR2']}, {'rank': 3, 'term': 'Positive Regulation Of Myeloid Cell Apoptotic Process (GO:0033034)', 'p_value': 0.0006998773712248138, 'odds_ratio': 3332.0, 'genes': ['HCAR2']}, {'rank': 4, 'term': 'Glucosamine-Containing Compound Catabolic Process (GO:1901072)', 'p_value': 0.0007998405838081707, 'odds_ratio': 2855.8571428571427, 'genes': ['CHI3L1']}, {'rank': 5, 'term': 'Positive Regulation Of Leukocyte Apoptotic Process (GO:2000108)', 'p_value': 0.0008997988691311835, 'odds_ratio': 2498.75, 'genes': ['HCAR2']}, {'rank': 6, 'term': 'Activation Of NF-kappaB-inducing Kinase Activity (GO:0007250)', 'p_value': 0.0014994446955652384, 'odds_ratio': 1427.4285714285713, 'genes': ['CHI3L1']}, {'rank': 7, 'term': 'Negative Regulation Of Lipid Catabolic Process (GO:0050995)', 'p_value': 0.0017992006270532422, 'odds_ratio': 1175.3529411764705, 'genes': ['HCAR2']}, {'rank': 8, 'term': 'Positive Regulation Of Hormone Secretion (GO:0046887)', 'p_value': 0.001899109329170248, 'odds_ratio': 1110.0, 'genes': ['HCAR2']}]
terms = [t['term'][:45] for t in go_bp][::-1]
neglogp = [-np.log10(max(t['p_value'], 1e-300)) for t in go_bp][::-1]
fig, ax = plt.subplots(figsize=(9, 4.5))
ax.barh(terms, neglogp, color='#4fc3f7')
ax.set_xlabel('-log10(p-value)')
ax.set_title('Top GO:BP enrichment (Enrichr)')
ax.grid(axis='x', alpha=0.3)
plt.tight_layout(); plt.show()
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3. STRING protein interaction network¶
print('No STRING PPI data available')
No STRING PPI data available
4. Reactome pathway footprint¶
pw_rows = [{'gene': 'APOE', 'n_pathways': 8, 'top_pathway': 'Nuclear signaling by ERBB4'}, {'gene': 'GPC4', 'n_pathways': 8, 'top_pathway': 'Glycosaminoglycan-protein linkage region biosynthesis'}, {'gene': 'TREM2', 'n_pathways': 4, 'top_pathway': 'Immunoregulatory interactions between a Lymphoid and a non-Lymphoid ce'}]
pd.DataFrame(pw_rows).sort_values('n_pathways', ascending=False)
| gene | n_pathways | top_pathway | |
|---|---|---|---|
| 0 | APOE | 8 | Nuclear signaling by ERBB4 |
| 1 | GPC4 | 8 | Glycosaminoglycan-protein linkage region biosy... |
| 2 | TREM2 | 4 | Immunoregulatory interactions between a Lympho... |
5. Hypothesis ranking (2 hypotheses)¶
hyp_data = [('TREM2-Dependent Microglial Phagocytosis Acts as a Strai', 0.636), ('GPC4/HSPGs Collaborate with ApoE Isoforms to Dictate Ta', 0.583)]
titles = [h[0] for h in hyp_data][::-1]
scores = [h[1] for h in hyp_data][::-1]
fig, ax = plt.subplots(figsize=(10, max(8, len(titles)*0.4)))
colors = ['#ef5350' if s >= 0.6 else '#ffa726' if s >= 0.5 else '#66bb6a' for s in scores]
ax.barh(range(len(titles)), scores, color=colors)
ax.set_yticks(range(len(titles))); ax.set_yticklabels(titles, fontsize=7)
ax.set_xlabel('Composite Score'); ax.set_title('What are the specific molecular determinants that govern tau strain selection during prion-like propagation?')
ax.grid(axis='x', alpha=0.3)
plt.tight_layout(); plt.show()
labels = ['TREM2-Dependent Microglial Phagocytosis ', 'GPC4/HSPGs Collaborate with ApoE Isoform']
matrix = np.array([[0.72, 0.78, 0.8, 0.65, 0.0, 0.75, 0.7, 0.85, 0.62], [0.8, 0.55, 0.75, 0.72, 0.0, 0.68, 0.6, 0.52, 0.48]])
dims = ['novelty_score', 'feasibility_score', 'impact_score', 'mechanistic_plausibility_score', 'clinical_relevance_score', 'data_availability_score', 'reproducibility_score', 'druggability_score', 'safety_profile_score']
if matrix.size:
fig, ax = plt.subplots(figsize=(10, 5))
im = ax.imshow(matrix, cmap='RdYlGn', aspect='auto', vmin=0, vmax=1)
ax.set_xticks(range(len(dims)))
ax.set_xticklabels([d.replace('_score','').replace('_',' ').title() for d in dims],
rotation=45, ha='right', fontsize=8)
ax.set_yticks(range(len(labels))); ax.set_yticklabels(labels, fontsize=7)
ax.set_title('Score dimensions — hypotheses')
plt.colorbar(im, ax=ax, shrink=0.8)
plt.tight_layout(); plt.show()
else:
print('No score data available')
6. PubMed literature per hypothesis¶
Hypothesis 1: TREM2-Dependent Microglial Phagocytosis Acts as a Strain Selection Fil¶
Target genes: TREM2 · Composite score: 0.636
TREM2-Dependent Microglial Phagocytosis Acts as a Strain Selection Filter in Tauopathy Progression¶
A Comprehensive Mechanistic Hypothesis¶
The triggering receptor expressed on myeloid cells 2 (TREM2) occupies a central position in microglial biology, serving as a critical modulator of phagocyt
print('No PubMed results for hypothesis h-dca86efa')
No PubMed results for hypothesis h-dca86efa
Hypothesis 2: GPC4/HSPGs Collaborate with ApoE Isoforms to Dictate Tau Conformationa¶
Target genes: GPC4/APOE · Composite score: 0.583
GPC4/HSPGs Collaborate with ApoE Isoforms to Dictate Tau Conformational Strain Uptake Efficiency¶
Heparan Sulfate Proteoglycans as Tau Uptake Regulators¶
Heparan sulfate proteoglycans (HSPGs) are cell-surface molecules bearing heparan sulfate chains that interact with a wide variety of protei
print('No PubMed results for hypothesis h-ec79168b')
No PubMed results for hypothesis h-ec79168b
7. Knowledge graph edges (1 total)¶
edge_data = [{'source': 'GPC4/APOE', 'relation': 'promoted: GPC4/HSPGs Coll', 'target': 'neurodegeneration', 'strength': 0.58}]
if edge_data:
pd.DataFrame(edge_data).head(25)
else:
print('No KG edge data available')
Caveats¶
This notebook uses real Forge tool calls from live APIs:
- Enrichment is against curated gene-set libraries (Enrichr)
- STRING/Reactome/HPA/MyGene reflect curated knowledge
- PubMed literature is search-relevance ranked, not systematic review