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 |
| IRS1 | 2q36.3 | 147545 | REa, A | {Diabetes mellitus, noninsulin-dependent}, 125853 (3) | 125853 | 3 |
| IRS1 | 2q36.3 | 147545 | REa, A | {Coronary artery disease, susceptibility to} (3) | NA | NA |