Abstract
Lewy body disease (LBD) is characterized by accumulation of aggregated α-synuclein in the central nervous system as eosinophilic cytoplasmic inclusions called Lewy bodies. According to their distribution pattern, it is classified into brainstem LBD, limbic LBD and diffuse neocortical LBD. It has been reported that α-synuclein affects various points in the MAPK cascade but its relationship with FGF receptors, which are the most upstream of the pathway, has not been previously investigated. We discovered that among the four FGFRs, FGFR3 showed neuronal upregulation in LBD brains histopathologically. Further examination using neuron-specific methylome analysis revealed that the gene body of FGFR3 was hypermethylated in LBD, suggesting its increased transcription. Altered methylation was not observed in the non-neuronal genome. Altered methylation status was associated with the severity of α-synuclein pathology.
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