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Phenotypic variability at the TGF-beta1 locus in Camurati-Engelmann disease
B Campos-Xavier1, J M Saraiva, R Savarirayan
1Department of Medical Genetics and INSERM U393, Hôpital Necker Enfants Malades, 149 Rue de Sèvres, 75015 Paris, France.
Human Genetics
|January 26, 2002
Summary
Camurati-Engelmann disease (CED) is a rare bone disorder caused by transforming growth factor beta-1 (TGF-beta1) gene mutations. This study identifies new mutations and confirms R218C as the most common worldwide, noting significant clinical variability.
Area of Science:
- Genetics
- Molecular Biology
- Bone Dysplasias
Background:
- Camurati-Engelmann disease (CED) is an autosomal dominant sclerosing bone dysplasia.
- Mutations in the transforming growth factor beta-1 (TGF-beta1) gene on chromosome 19q13.1-q13.3 are the cause of CED.
- Previous studies identified five mutations in the TGF-beta1 propeptide in 21 families.
Purpose of the Study:
- To identify and characterize TGF-beta1 mutations in Australian and European families with CED.
- To investigate the correlation between specific TGF-beta1 mutations and clinical manifestations.
- To explore the role of TGF-beta1 gene polymorphisms in CED severity and variability.
Main Methods:
- Genetic analysis of seven families (one Australian, six European) with CED.
- Sequencing of the TGF-beta1 gene to identify mutations.
- Clinical evaluation of patients to assess disease severity and variability.
- Analysis of TGF-beta1 gene polymorphisms.
Main Results:
- Three distinct TGF-beta1 mutations were identified: R218H (family 1), R218C (families 2, 6, 7), and C225R (families 3, 4, 5).
- The R218C mutation was found to be the most prevalent worldwide, identified in 17 out of 28 reported families.
- No clear correlation was found between the specific mutation type and disease severity, but significant intrafamilial clinical variability was observed, suggesting incomplete penetrance.
- TGF-beta1 gene polymorphisms did not correlate with disease severity.
Conclusions:
- CED is a genetically heterogeneous condition with variable clinical presentation.
- The R218C mutation in the TGF-beta1 gene is the most common cause of CED globally.
- Intrafamilial clinical variability and incomplete penetrance are characteristic of CED, and this variability is not explained by TGF-beta1 polymorphisms.