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A structure-function study of MID1 mutations associated with a mild Opitz phenotype.

Laila Mnayer1, Sawsan Khuri, Hassan Al-Ali Merheby

  • 1The Dr. John T. Macdonald Foundation Center for Medical Genetics, University of Miami Miller School of Medicine, Miami, FL, USA. lmnayer@med.miami.edu

Molecular Genetics and Metabolism
|December 28, 2005
PubMed
Summary

Opitz syndrome (OS) mutations in the MID1 gene

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Area of Science:

  • Genetics
  • Molecular Biology
  • Developmental Biology

Background:

  • Opitz syndrome (OS) is a genetic disorder affecting midline development, linked to mutations in the MID1 gene.
  • The MID1 protein has several functional domains, including a fibronectin type III (FNIII) domain, crucial for its function.

Observation:

  • A patient with a milder OS phenotype, including hypertelorism and tracheo-esophageal fistula but normal intelligence, was identified.
  • This patient harbored a novel MID1 mutation (P441L) located within the FNIII domain.

Findings:

  • Missense mutations in the MID1 FNIII domain are associated with milder OS phenotypes compared to mutations elsewhere in the gene.
  • Truncating mutations in MID1 consistently result in severe OS.
  • The P441L mutation likely disrupts protein-protein interactions, affecting MID1 function.

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Implications:

  • The FNIII domain of MID1 may play a role in post-neural tube closure midline development.
  • Understanding MID1 structure-function relationships can help predict OS severity based on mutation location.
  • This research contributes to the understanding of genotype-phenotype correlations in Opitz syndrome.