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Renal coloboma syndrome (RCS) is a rare inherited condition exhibiting a variable clinical phenotype of renal and ocular abnormalities. In 50% of cases, mutations can be found in the transcription factor PAX2. We present three generations of a family with a PAX2 mutation who showed variable eye and renal phenotypes. Renal phenotypes ranged from normal kidneys with the absence of proteinuria to end-stage renal disease (ESRD) at 17 years of age. Eye phenotypes included the typical morning glory anomaly, macular retinal pigment epithelial changes and retinal venous tortuosity. We identified a PAX2 mutation c.228_251dup [p.Ser77_Gly84dup] which segregated with the phenotype in an autosomal dominant fashion. A molecular genetic diagnosis allowed identification and management of at-risk family members. Given the phenotypic variability, clinicians need to consider the possibility of RCS in patients with a family history of chronic kidney disease (CKD) or eye disease.

A wide spectrum of phenotypes in a family with renal coloboma syndrome caused by aPAX2mutation