Lewy-MSA hybrid fold drives distinct neuronal α-synuclein pathology
Masahiro Enomoto, Iván Martínez-Valbuena, Shelley L. Forrest, Xiaoxiao Xu, Renato P. Munhoz, Jun Li, Ekaterina Rogaeva, Anthony E. Lang, Gábor G. Kovács
Abstract
The ordered assembly of α-synuclein protein encoded by SNCA into filaments characterizes neurodegenerative synucleinopathies. Lewy body disease (LBD) shows predominantly neuronal and multiple system atrophy (MSA), predominantly oligodendrocytic α-synuclein pathology affecting subcortical brain structures. Based on cryo-electron microscopy, it was reported that the structures of α-synuclein filaments from LBD differ from MSA and juvenile-onset synucleinopathy (JOS). The rare atypical MSA subtype shows abundant neuronal argyrophilic α-synuclein inclusions in the limbic system. Current concepts indicate that disease entities are characterized by unique protofilament folds. Here we demonstrate that α-synuclein can form a Lewy-MSA hybrid fold, leading to the atypical histopathological form of MSA. Distinct biochemical characteristics of α-synuclein, as demonstrated by protease-sensitivity digestion assay, seed amplification assays (SAAs), and conformational stability assays (CSA), are also linked to cytopathological differences. We expand the current structure-based classification of α−synucleinopathies and propose that cell-specific protein pathologies can be associated with distinct filament folds. Structural and biochemical analyses reveal Lewy-MSA hybrid α-synuclein filament fold in atypical pathological variant of MSA, linking distinct neuronal cytopathology to unique filament conformations and expanding structure-based classification.