Convergence hypothesis: PINK1/Parkin-mediated mitophagy dysfunction in neurons and TREM2-mediated microglial mitophagy failure represent a unified convergence point driving both Parkinson's disease (PD) and Alzheimer's disease (AD) pathophysiology.
PD-specific mechanism: PINK1 kinase phosphorylates Parkin (PRKN) and ubiquitin at mitochondrial outer membrane, triggering clearance of damaged mitochondria. In PD, mutations in PINK1 (PARK6) or PRKN (PARK2) impair this clearance, leading to mitochondrial ROS spillover that accelerates α-synuclein aggregation. The α-synuclein (SNCA) feedback loop then further inhibits mitochondrial complex I (NDUFS7), creating a vicious cycle.
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Curated pathway diagram from expert analysis
flowchart TD
A["Damaged Mitochondria
ROS and Depolarization"]
B["PINK1 Accumulation
Outer Membrane Signal"]
C["PRKN Parkin Recruitment
Ubiquitin Phosphorylation"]
D["Mitophagosome Formation
STUB1 and Autophagy Adaptors"]
E["TREM2 Microglial Mitophagy
Innate Immune Energy Control"]
F["Failed Mitochondrial Clearance
Inflammatory ROS Loop"]
G["PD SNCA and AD Tau Abeta Convergence
Neurodegeneration"]
A --> B
B --> C
C --> D
E --> D
D -.->|"when impaired"| F
F --> G
style C fill:#1a237e,stroke:#4fc3f7,color:#4fc3f7
style G fill:#b71c1c,stroke:#ef9a9a,color:#ef9a9a
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No clinical trials data available
Freshness score = exp(-age×ln2/5): halves every 5 years. Green >0.6, Amber 0.3–0.6, Red <0.3.
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No DepMap CRISPR Chronos data found for PINK1,PRKN,TREM2,STUB1,NDUFS7.
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