Serum albumin is synthesized exclusively by the liver and absent from CNS under normal BBB. When barrier permeability increases, albumin leaks into CSF at rates proportional to disruption severity. The albumin quotient (QAlb) provides a validated, quantitative index of global BBB integrity. QAlb elevation above age-adjusted reference ranges precedes measurable cognitive decline and represents a cost-effective screening tool for prodromal neurodegeneration when combined with disease-specific biomarkers.
Curated pathway from expert analysis
flowchart TD A["BBB Disruption"] --> B["Albumin Leakage into CSF"] B --> C["Elevated QAlb"] C --> D["Neuronal Injury"] C --> E["Glial Activation"] D --> F["Elevated NfL"] E --> G["Elevated GFAP"] F --> H["Cognitive Decline"] G --> H H --> I["Neurodegeneration Progression"] C --> J["Dementia Risk Independent of Amyloid"] A --> K["BBB Permeability Increase"] K --> B C --> L["Prodromal Neurodegeneration Screening"] L --> M["Disease-Specific Biomarker Combination"] M --> I
No linked papers recorded for this hypothesis yet.
No curated PDB or AlphaFold mapping for ALB yet. Search RCSB →
Median TPM across 13 brain regions for ALB from GTEx v10.
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 ALB.
Run python3 scripts/backfill_hypothesis_depmap.py to populate.
No resource usage or linked notebooks recorded for this hypothesis yet.
| Prediction | Predicted | Observed | Status | Conf |
|---|---|---|---|---|
| If Qalb reflects BBB dysfunction-driven neurodegeneration rather than systemic leakage, then Qalb will correlate with pericyte injury markers (sPDGFRβ, sTM) and endothelial dysfunction (ICAM-1, VCAM-1 | In paired CSF/serum samples (n≥100), Qalb correlates with CSF sPDGFRβ (r>0.5), sTM (r>0.4), and serum ICAM-1 (r>0.35), but not with serum high-sensitivity CRP o | — no observation — | pending | 0.76 |
| If elevated CSF/serum albumin quotient (Qalb) independently predicts neurodegeneration progression, then Qalb > 4.5 x10^-3 will stratify MCI patients into fast vs slow progressors, with high Qalb pred | MCI patients with Qalb >4.5e-3 (n≥50) show 2-3x faster MMSE decline (2.5-3.5 points/year vs 1-1.5 points/year), 2x greater hippocampal atrophy rate (>1.5%/year | — no observation — | pending | 0.80 |