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 |
| RHO | 3q22.1 | 180380 | REa, A, Fd | Retinitis pigmentosa 4, autosomal dominant or recessive, 613731 (3) | 613731 | 3 |
| RHO | 3q22.1 | 180380 | REa, A, Fd | Night blindness, congenital stationary, autosomal dominant 1, 610445 (3) | 610445 | 3 |
| RHO | 3q22.1 | 180380 | REa, A, Fd | Retinitis punctata albescens, 136880 (3) | 136880 | 3 |