1 => The disorder is placed on the map based on its association with a gene, but the underlying defect is not known
2 => The disorder has been placed on the map by linkage; no mutation has been found
3 => The molecular basis for the disorder is known; a mutation has been found in the gene
4 => A contiguous gene deletion or duplication syndrome, multiple genes are deleted or duplicated causing the phenotype
| Gene Symbol | Chromosomal Location | Gene MIM number | Mapping Method | Phenotype | Phenotype MIM number | Phenotype Mapping Key |
| SNCA | 4q22.1 | 163890 | Psh, A, Fd | Parkinson disease 4, 605543 (3) | 605543 | 3 |
| SNCA | 4q22.1 | 163890 | Psh, A, Fd | Dementia, Lewy body, 127750 (3) | 127750 | 3 |
| SNCA | 4q22.1 | 163890 | Psh, A, Fd | Parkinson disease 1, 168601 (3) | 168601 | 3 |