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PAX6 mutations reviewed

J Prosser1, V van Heyningen

  • 1MRC Human Genetics Unit, Western General Hospital, Edinburgh, UK.

Human Mutation
|March 3, 1998
PubMed
Summary
This summary is machine-generated.

Mutations in the PAX6 gene cause aniridia and other eye conditions. Most PAX6 mutations lead to a loss of gene function, impacting eye development.

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Area of Science:

  • Genetics
  • Ophthalmology
  • Developmental Biology

Background:

  • Mutations in the PAX6 gene are the primary cause of human aniridia.
  • PAX6 mutations are also associated with Peter's anomaly, congenital cataracts, autosomal dominant keratitis, and foveal hypoplasia.
  • The PAX6 gene, located at chromosome 11p13, is considered the major gene responsible for aniridia.

Purpose of the Study:

  • To analyze the spectrum and characteristics of PAX6 mutations.
  • To understand the mutation patterns within the PAX6 gene.
  • To investigate the functional consequences of identified PAX6 mutations.

Main Methods:

  • Review and analysis of reported PAX6 mutations.
  • Categorization of mutations based on type (e.g., C-T changes, splicing errors, deletions/insertions).

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  • Assessment of mutation distribution within different gene domains (paired and homeodomain).

    • Main Results:

    • C-T changes at CpG dinucleotides (28%) and splicing errors (20%) are common PAX6 mutation types.
    • Over 30% of mutations involve deletions or insertions.
    • Elevated mutation rates are observed in the paired domain, with increased mutations in the homeodomain due to a hypermutable CpG dinucleotide.
    • The majority of mutations result in a loss of function, with over 80% of exonic substitutions leading to nonsense codons.

    Conclusions:

    • PAX6 mutations are strongly linked to aniridia and related eye disorders.
    • Specific mutation types and hotspots (CpG dinucleotides) are identified within the PAX6 gene.
    • Most PAX6 mutations identified result in a loss of protein function, explaining the associated phenotypes.
    • Undiscovered missense mutations in highly conserved regions may contribute to unidentified ocular phenotypes.