1 => Disorder placed on map based on association with a gene; defect unknown
2 => Disorder placed by linkage; no mutation found
3 => Molecular basis known; mutation found in gene
4 => Contiguous gene deletion/duplication syndrome
| Gene Symbol | Chromosomal Location | Gene MIM number | Mapping Method | Phenotype | Phenotype MIM number | Phenotype Mapping Key |
| PTPRF | 1p34.2 | 179590 | A | ?Breasts and/or nipples, aplasia or hypoplasia of, 2, 616001 (3) | 616001 | 3 |