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© 1993 Oxford University Press

RESEARCH-ARTICLE

Mutations in the PAX6 gene in patients with hereditary aniridia

Alison Davis and John K.Cowell*

ICRF Oncology Group, Institute of Child Health 30 Guilford Street, London WC1N 1EH, UK

*To whom correspondence should be addressed

Received August 31, 1993; Revised October 12, 1993; Accepted October 12, 1993

The 14 exons of the PAX6 gene have been analysed exon-by-exon using SSCP in 6 aniridla families. In each family band shifts were observed on the SSCP gels for only one exon and direct PCR-sequencing revealed mutations in each case. Two mutations involved C—T transitions in CGAarg codons in exons 9 and 11. Another C—T transition converted a CAG-glutamine to a TAG-stop in exon 7. Small insertions created frameshifts which produced downsteam stop codons in another two patients and an A—T mutation disrupted the splice donor site of exon 5 in the remaining family. Thus, complete inactivation of the PAX6 gene is predicted in all cases. Analysis of other affected members of the families showed that, in each case, all affected individuals carried the same family-specific mutation. One polymorphism was found in exon 7. This data strongly supports the candidature of PAX6 as the gene responsible for hereditary aniridia.


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