| Disease ID | Source | Name | Description |
| 617141 | OMIM | Aniridia 2 (AN2) | A form of aniridia, a congenital, bilateral, panocular disorder characterized by complete absence of the iris or extreme iris hypoplasia. Aniridia is not just an isolated defect in iris development but it is associated with macular and optic nerve hypoplasia, cataract, corneal changes, nystagmus. Visual acuity is generally low but is unrelated to the degree of iris hypoplasia. Glaucoma is a secondary problem causing additional visual loss over time. The disease is caused by variants affecting the gene represented in this entry. A disease-causing mutation is located in intron 9 of ELP4. The mutation does not alter normal ELP4 expression and function, but disrupts a long-range cis-regulatory element of PAX6 expression, known as SIMO. SIMO is contained within ELP4 intron 9 and located 150 kb downstream of PAX6. |