Syndromic aniridia

Syndromic aniridia refers to a group of rare genetic conditions in which aniridia (the partial or complete absence of the iris of the eye) occurs alongside additional systemic abnormalities affecting other organs or body systems. Unlike isolated (non-syndromic) aniridia, syndromic forms are associated with broader clinical features that may include intellectual disability, genitourinary anomalies, obesity, or an increased risk of certain tumors, depending on the specific syndrome involved. The most well-known syndromic form is WAGR syndrome (Wilms tumor, Aniridia, Genitourinary anomalies, and intellectual disability/Range of developmental delays), caused by contiguous gene deletions on chromosome 11p13 involving the PAX6 gene and the WT1 gene. Another recognized syndromic form is Gillespie syndrome, which combines aniridia with cerebellar ataxia and intellectual disability. The ocular manifestations of syndromic aniridia can be severe and progressive. Patients typically present at birth or early infancy with absent or hypoplastic irides, leading to photosensitivity and reduced visual acuity. Associated ocular complications may include glaucoma, cataracts, corneal opacification (aniridia-related keratopathy), foveal hypoplasia, and nystagmus. In WAGR syndrome, surveillance for Wilms tumor (a childhood kidney cancer) is critical, as the risk is substantially elevated due to WT1 gene deletion. Genitourinary anomalies in WAGR may include cryptorchidism, hypospadias, streak gonads, and renal abnormalities. Some patients with larger deletions (WAGRO syndrome) also develop obesity. Management of syndromic aniridia requires a multidisciplinary approach. Ophthalmologic care includes regular monitoring for glaucoma and cataracts, use of tinted lenses for photosensitivity, and surgical interventions when needed. For WAGR syndrome, regular renal ultrasound screening (typically every three months until at least age 8) is essential for early detection of Wilms tumor. Developmental support, educational interventions, and monitoring of renal function are also important components of care. There is currently no cure for the underlying genetic cause, and treatment remains symptomatic and preventive.

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