This research identifies the tubulin polymerization promoting protein (TPPP/p25) as a highly specific biomarker for diagnosing multiple system atrophy (MSA). Researchers discovered that while the protein's native state is self-protected from aggregation, its core domain (CORE) is prone to forming toxic amyloid fibrils that distinguish MSA from related conditions like Parkinson’s disease. Using cryo-electron microscopy, the study mapped the structural remodeling required for this aggregation and identified a disease-associated mutation (A119V) that accelerates the process. These insights led to the development of a seed amplification assay (SAA) utilizing a recombinant miniCORE substrate to detect minute amounts of protein seeds in cerebrospinal fluid. The resulting assay demonstrates exceptional sensitivity and specificity, offering a robust clinical tool for the early and precise differentiation of MSA from other neurodegenerative disorders.
References:
Zeng S, Zhang S, Zhang S . TPPP/p25 amyloid seeding activity as a specific biomarker for multiple system atrophy. Cell, 2026; 0
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