How do sphingomyelin/ceramide ratios specifically regulate BACE1 clustering and activity in synaptic vs non-synaptic lipid rafts?¶
Notebook ID: nb-SDA-2026-04-15-gap-debate-20260410-112819-e40e0fa2 · Analysis: SDA-2026-04-15-gap-debate-20260410-112819-e40e0fa2 · Generated: 2026-04-21T18:43:30
Research question¶
The debate established that ceramide accumulation affects amyloid-β processing but didn't resolve the spatial specificity of this mechanism. Understanding differential raft regulation could enable targeted interventions that preserve synaptic function while reducing amyloidogenic processing.
Source: Debate session sess_SDA-2026-04-01-gap-lipid-rafts-2026-04-01 (Analysis: SDA-2026-04-01-gap-lipid-rafts-2026-04-01)
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: 0.84 · Rounds: 4
1. Target gene annotations (MyGene)¶
import pandas as pd
ann_rows = [{'gene': 'SMPD1', 'name': 'sphingomyelin phosphodiesterase 1', 'summary': 'The protein encoded by this gene is a lysosomal acid sphingomyelinase that converts sphingomyelin to ceramide. The encod'}]
pd.DataFrame(ann_rows)
| gene | name | summary | |
|---|---|---|---|
| 0 | SMPD1 | sphingomyelin phosphodiesterase 1 | The protein encoded by this gene is a lysosoma... |
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': 'SMPD1', 'n_pathways': 1, 'top_pathway': 'Glycosphingolipid catabolism'}]
pd.DataFrame(pw_rows).sort_values('n_pathways', ascending=False)
| gene | n_pathways | top_pathway | |
|---|---|---|---|
| 0 | SMPD1 | 1 | Glycosphingolipid catabolism |
5. Hypothesis ranking (1 hypotheses)¶
hyp_data = [('SMPD1 (Acid Sphingomyelinase) Inhibition for Ceramide R', 0.732)]
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('How do sphingomyelin/ceramide ratios specifically regulate BACE1 clustering and activity in synaptic vs non-synaptic lipid rafts?')
ax.grid(axis='x', alpha=0.3)
plt.tight_layout(); plt.show()
labels = ['SMPD1 (Acid Sphingomyelinase) Inhibition']
matrix = np.array([[0.55, 0.82, 0.75, 0.78, 0.0, 0.8, 0.75, 0.85, 0.6]])
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: SMPD1 (Acid Sphingomyelinase) Inhibition for Ceramide Reduction and BA¶
Target genes: SMPD1 · Composite score: 0.732
Acid sphingomyelinase (ASM/SMPD1) is elevated in Alzheimer disease brains, leading to reduced sphingomyelin and elevated ceramide accumulation within membrane microdomains. SMPD1 genetic association with AD is supported by Open Targets (score 0.5417), providing independent genetic validation for thi
lit_data = [{'year': '2016', 'journal': 'Hum Mutat', 'title': 'SMPD1 Mutation Update: Database and Comprehensive Analysis of Published and Nove', 'pmid': '26499107'}, {'year': '2023', 'journal': 'Mol Biol Rep', 'title': 'SMPD1 gene variants in patients with β-Thalassemia major.', 'pmid': '36725747'}, {'year': '2019', 'journal': 'Mov Disord', 'title': "SMPD1 mutations, activity, and α-synuclein accumulation in Parkinson's disease.", 'pmid': '30788890'}, {'year': '2023', 'journal': 'Hereditas', 'title': 'SMPD1 expression profile and mutation landscape help decipher genotype-phenotype', 'pmid': '36907956'}, {'year': '2021', 'journal': 'Cell Rep', 'title': 'Targeting glioblastoma signaling and metabolism with a re-purposed brain-penetra', 'pmid': '34731610'}]
if lit_data:
df = pd.DataFrame(lit_data)
print(f'{len(lit_data)} PubMed results')
display(df)
else:
print('No PubMed results')
5 PubMed results
| year | journal | title | pmid | |
|---|---|---|---|---|
| 0 | 2016 | Hum Mutat | SMPD1 Mutation Update: Database and Comprehens... | 26499107 |
| 1 | 2023 | Mol Biol Rep | SMPD1 gene variants in patients with β-Thalass... | 36725747 |
| 2 | 2019 | Mov Disord | SMPD1 mutations, activity, and α-synuclein acc... | 30788890 |
| 3 | 2023 | Hereditas | SMPD1 expression profile and mutation landscap... | 36907956 |
| 4 | 2021 | Cell Rep | Targeting glioblastoma signaling and metabolis... | 34731610 |
7. Knowledge graph edges (1 total)¶
edge_data = [{'source': 'SMPD1', 'relation': 'promoted: SMPD1 (Acid Sph', 'target': 'neurodegeneration', 'strength': 0.6}]
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