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Analyses of the effects that disease-causing missense mutations have on the structure and function of the

R A Saleem1, S Banerjee-Basu, F B Berry

  • 1Department of Medical Genetics, University of Alberta, Edmonton, Alberta, T6G 2H7, Canada.

American Journal of Human Genetics
|February 17, 2001
PubMed

Insights

Five FOXC1 mutations linked to Axenfeld-Rieger malformations were studied. Some mutations impair DNA binding or protein levels, all reduce FOXC1

Area of Science:

  • Genetics
  • Molecular Biology
  • Developmental Biology

Background:

  • Axenfeld-Rieger malformations are congenital eye disorders.
  • The FOXC1 transcription factor is crucial for ocular development.
  • Mutations in FOXC1 are associated with Axenfeld-Rieger malformations.

Purpose of the Study:

  • To investigate the structural and functional impact of five missense mutations in the FOXC1 transcription factor.
  • To determine how these mutations affect FOXC1's DNA binding and transactivation capabilities.
  • To elucidate the mechanisms by which FOXC1 dysfunction leads to Axenfeld-Rieger malformations.

Main Methods:

  • Molecular modeling of the FOXC1 forkhead domain.
  • Biochemical analyses of mutant FOXC1 protein localization and levels.
  • DNA-binding assays.
  • Transactivation assays.

Main Results:

  • Missense mutations in FOXC1 did not alter its overall structure.
  • The I87M mutation reduced FOXC1 protein levels.
  • S82T and S131L mutations decreased DNA binding, while F112S and I126M mutations did not.
  • F112S and I126M mutations, along with all others, reduced FOXC1's transactivation ability.
  • The FOXC1 forkhead domain exhibits separable DNA-binding and transactivation functions.

Conclusions:

  • Reduced FOXC1 stability, DNA binding, or transactivation can cause Axenfeld-Rieger malformations.
  • These findings highlight the distinct functional roles within the FOXC1 forkhead domain.
  • Understanding these mechanisms provides insights into congenital eye disorder pathogenesis.

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