Genetic analysis of chromosome 11p13 and the PAX6 gene in a series of 125 cases referred with aniridia.
A series of 125 patients referred primarily with aniridia classified as either sporadic (74), familial (24), or in association with WAGR syndrome (14) or other malformations (13) was analysed for mutations, initially by karyotyping and targeted FISH analysis of chromosome 11p13. These methods identified mutations in a significant proportion of patients, 34/125 (27%). Two cases had chromosome rearrangements involving 11p13, 16 cases had visible deletions, and 16 cases had cryptic deletions identified by FISH. The frequency of cryptic deletions in familial aniridia was 27% and in sporadic isolated aniridia was 22%. Of the 14 cases referred with WAGR syndrome, 10 (71%) had chromosomal deletions, 2 cryptic and 8 visible. Of the 13 cases with aniridia and other malformations, 5 (38%) had a chromosomal rearrangement or deletion. In 37 cases with no karyotypic or cryptic chromosome abnormality, sequence analysis of the PAX6 gene was performed. Mutations were identified in 33 cases; 22 with sporadic aniridia, 10 with familial aniridia and 1 with aniridia and other non-WAGR syndrome associated anomalies. Overall, 67 of 71 cases (94%) undergoing full mutation analysis had a mutation in the PAX6 genomic region.
Robinson
David O
DO
Wessex Regional Genetics Laboratory, Salisbury District Hospital, Salisbury, Wiltshire, UK. david.robinson@salisbury.nhs.uk
Howarth
Rachel J
RJ
Williamson
Kathleen A
KA
van Heyningen
Veronica
V
Beal
Sarah J
SJ
Crolla
John A
JA
D015783:Aniridia / Q000175:diagnosis / Q000235:genetics*; D002880:Chromosomes, Human, Pair 11; D005136:Eye Proteins / Q000235:genetics*; D018398:Homeodomain Proteins / Q000235:genetics*; D006801:Humans; D017404:In Situ Hybridization, Fluorescence; D007621:Karyotyping; D009030:Mosaicism; D009154:Mutation; D000071841:PAX6 Transcription Factor; D051761:Paired Box Transcription Factors / Q000235:genetics*; D010641:Phenotype; D012097:Repressor Proteins / Q000235:genetics*; D017421:Sequence Analysis
D005136:Eye Proteins; D018398:Homeodomain Proteins; D000071841:PAX6 Transcription Factor; C000605730:PAX6 protein, human; D051761:Paired Box Transcription Factors; D012097:Repressor Proteins