| Italian families | Most common in Contursi, Calabria region — approximately 30 families identified |
| German families | Smaller kindreds identified through systematic screening |
| Japanese families | Rare, reported in isolated cases with no family history |
| Korean families | Few documented cases |
| Greek families | Second largest cohort after Italian populations |
| Age-related penetrance | 10-20% at age 50, increasing to 85-95% by age 80 |
| Gender effect | Some studies suggest male predominance (approximately 1.5:1 male to female ratio) |
| Modifiers | Unknown genetic and environmental factors influence onset and severity |
| Founder effect | Molecular dating indicates a common ancestor dating to the Roman era |
| Haplotype analysis | Carriers share a common haplotype spanning the SNCA locus |
| De novo mutations | Very rare; almost all cases trace to founder ancestors |
| Altered membrane affinity | Reduced phospholipid membrane binding due to threonine's increased polarity compared to alanine |
| Databases | OMIMOrphanetClinicalTrialsPubMed |
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