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 |
| LPIN2 | 18p11.31 | 605519 | REc | Majeed syndrome, 609628 (3) | 609628 | 3 |