Prenatal diagnosis of aniridia.

OBJECTIVE: To use molecular genetic techniques to prenatally screen for aniridia.

DESIGN: Case report.

METHODS: DNA was extracted from cultured fibroblasts obtained through amniocentesis. Two mutation detection methods, Ava1 restriction digestion and single-strand conformational polymorphism electrophoresis, were used to screen the PAX6 gene.

MAIN OUTCOME MEASURES: The results from the amniocentesis sample were compared with DNA obtained from the affected father, firstborn infant, and unaffected mother to determine whether the fetus carried the PAX6 mutation.

RESULTS: DNA from the fetus demonstrated the same banding pattern as the affected father and firstborn infant.

CONCLUSIONS: The fetus carried the mutated PAX6 allele and was predicted to develop aniridia. This was later confirmed when the child was born. This case report illustrates an important use of genetic mutation screening in the clinical setting.