Markers of neurodegeneration (APP, alpha-synuclein) are related to markers of methylation (SAM, SAH) in patients with PD. Better cognitive function was related to higher methylation potential (SAM/SAH ratio).
pubmed.ncbi.nlm.nih.gov/196...
The ratio of SAM:SAH is frequently used as an indicator of cellular methylation capacity, whereby a decrease in this ratio predicts reduced cellular methylation potential. Folate is integrally involved in both substrate synthesis and product removal via its role in methionine synthesis from Hcy.
š§ Methylation Regulates Alpha-Synuclein Expression and Is Decreased in Parkinson's Disease Patients' Brains