PTK2B, BIN1, PICALM, and SORL1 form a trafficking and kinase-linked AD risk cluster in the dataset. The notebook identifies this as a druggable axis because PTK2B is a kinase, BIN1 and PICALM implicate endocytosis, and SORL1 ties the module to APP trafficking. Hypothesis: Pyk2 pathway modulation will normalize tau phosphorylation and endosomal stress in APOE4 or tauopathy human neuronal co-cultures.
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Curated Mechanism Pathway
Curated pathway diagram from expert analysis
flowchart TD
A["PTK2B FAK2 Kinase Postsynaptic Density Component"]
B["Calcium Influx NMDAR and Voltage-Gated Channel"]
C["PTK2B Autophosphorylation pY402 Kinase Activation"]
D["PI3K and SRC Coupling Downstream Effector Cascade"]
E["PICALM-Mediated Endocytosis Clathrin AP2 Recruitment"]
F["BIN1 Membrane Tubulation Endosomal Tau Routing"]
G["Tau Seed Propagation Trans-Synaptic Spread"]
A --> C
B --> A
C --> D
D --> E
E --> F
F --> G
style A fill:#1a237e,stroke:#4fc3f7,color:#4fc3f7
style C fill:#7b1fa2,stroke:#ce93d8,color:#ce93d8
style G fill:#b71c1c,stroke:#ef9a9a,color:#ef9a9a
Dimension Scores
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8 citations5 with PMIDValidation: 0%7 supporting / 1 opposing
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Evidence Matrix — sortable by strength/year, click Abstract to expand
Evidence Types
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Abstract
PTK2B, BIN1, PICALM, and SORL1 are AD risk loci li…
Supporting
GENE
dataset:ad_gene…
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Druggability ranking favors PTK2B because kinase b…
Supporting
GENE
notebook:gwas-a…
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Microglia PTK2B/Pyk2 in the Pathogenesis of Alzhei…
Proteomic analysis identifies HSP90AA1, PTK2B, and ANXA2 in the human entorhinal cortex in Alzheimer's disease…▼
Proteomic analysis identifies HSP90AA1, PTK2B, and ANXA2 in the human entorhinal cortex in Alzheimer's disease: Potential role in synaptic homeostasis and Aβ pathology through microglial and astroglial cells.
Common GWAS effect sizes are modest and causal direction may differ across neuronal and glial contexts.
notebook:gwas-ad-risk-loci-analysis
Multi-persona evaluation:
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the Skeptic challenges assumptions,
the Domain Expert assesses real-world feasibility, and
the Synthesizer produces final scores.
Expand each card to see their arguments.
No linked debates yet. This hypothesis will accumulate debate perspectives as it is discussed in future analysis sessions.
IF PTK2B kinase activity is pharmacologically inhibited (PF-07105691 or genetic knockdown) in APOE4 human iPSC-derived excitatory neurons co-cultured with APOE4 astrocytes, THEN phospho-tau217/181 levels will decrease by >40% and endosomal vesicle size will normalize to <1.2μm within 14 days of intervention.
pendingconf: 0.72
Expected outcome: Significant reduction in p-tau217 (≥40% decrease) and normalization of enlarged early endosomes (RAB5+ compartments to <1.2μm mean diameter) measured by high-content imaging and ELISA after 14 days of PTK2B inhibition.
Falsified by: No significant change (<20%) in phospho-tau levels or persistent endosomal enlargement (>1.5μm) after PTK2B inhibition would falsify the hypothesis that PTK2B modulates tau phosphorylation through endocytic trafficking.
Method: APOE4 homozygous iPSC-derived cortical excitatory neurons co-cultured with APOE4 astrocytes, treated with PTK2B inhibitor PF-07105691 (300nM) or CRISPRi PTK2B knockdown, with endpoints at day 7 and day 14. Outcomes assessed by Meso Scale Discovery ELISA for p-tau217/181 and automated immunofluorescence for RAB5+ endosome morphometry.
IF BIN1 or PICALM expression is genetically modulated (BIN1 knockout or PICALM overexpression) in human P301L tau iPSC neurons, THEN PTK2B autophosphorylation (pY402) and downstream phospho-CREB levels will change in opposite directions, confirming a regulatory axis between endocytic proteins and PTK2B kinase signaling within 10 days.
pendingconf: 0.68
Expected outcome: BIN1 KO will increase pY402-PTK2B by >60% and p-CREB by >50%; PICALM overexpression will decrease pY402-PTK2B by >40% and p-CREB by >35%, measured by western blot after 10 days.
Falsified by: No reciprocal changes in PTK2B phosphorylation following BIN1/PICALM modulation (change <20%) or paradoxical directionality would falsify the existence of a BIN1/PICALM-PTK2B regulatory axis in human neurons.
Method: Human P301L tau iPSC-derived cortical neurons with BIN1 CRISPR knockout or PICALM doxycycline-inducible overexpression, harvested at day 10 for western blot analysis of pY402-PTK2B, total PTK2B, p-S396-CREB, and total CREB. n≥3 biological replicates per condition.
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3D Protein Structure
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PTK2B — Search for structure
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