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Mutations at the PAX6 locus are found in heterogeneous anterior segment malformations including Peters' anomaly
I M Hanson1, J M Fletcher, T Jordan
1MRC Human Genetics Unit, Western General Hospital, Edinburgh, UK.
Insights
The PAX6 gene is crucial for eye development. Mutations in PAX6 are linked to aniridia and may also cause other anterior segment malformations like Peters
Area of Science:
- Genetics
- Ophthalmology
- Developmental Biology
Background:
- The PAX6 gene is a key regulator of ocular development.
- PAX6 mutations are established causes of aniridia.
- Anterior segment malformations (ASMs) are a diverse group of congenital eye disorders.
Purpose of the Study:
- To investigate the role of the PAX6 gene in a broader spectrum of anterior segment malformations beyond aniridia.
- To explore the genetic basis of Peters' anomaly and related ASMs.
Main Methods:
- Case study analysis of a child with Peters' anomaly and PAX6 deletion.
- Segregation analysis of a PAX6 paired box mutation (R26G) in a family with dominant ASMs.
- Phenotypic analysis of a mouse model (Smalleye mice) with a Pax-6 mutation.
Main Results:
- A child with Peters' anomaly exhibited a deletion in one copy of the PAX6 gene.
- Family members with dominantly inherited ASMs, including Peters' anomaly, were heterozygous for the PAX6 R26G mutation.
- A subset of Smalleye mice heterozygous for a Pax-6 nonsense mutation displayed ocular phenotypes similar to Peters' anomaly.
Conclusions:
- The findings implicate the PAX6 gene in the pathogenesis of a wider range of anterior segment malformations.
- PAX6 mutations and deletions are associated with conditions such as Peters' anomaly.
- This suggests PAX6 is a critical determinant for normal anterior segment development.
Abstract:
Mutation or deletion of the PAX6 gene underlies many cases of aniridia. Three lines of evidence now converge to implicate PAX6 more widely in anterior segment malformations including Peters' anomaly. First, a child with Peters' anomaly is deleted for one copy of PAX6. Second, affected members of a family with dominantly inherited anterior segment malformations, including Peters' anomaly are heterozygous for an R26G mutation in the PAX6 paired box. Third, a proportion of Sey/+ Smalleye mice, heterozygous for a nonsense mutation in murine Pax-6, have an ocular phenotype resembling Peters' anomaly. We therefore propose that a variety of anterior segment anomalies may be associated with PAX6 mutations.