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Fibrillin-1 mutations in Marfan syndrome and other type-1 fibrillinopathies
1Human Genetics Unit, Molecular Medicine Centre, University of Edinburgh, Scotland.
Abstract:
Fibrillin is the major component of extracellular microfibrils and is widely distributed in connective tissue throughout the body. Mutations in the fibrillin-1 (FBN1) gene, on chromosome 15q21.1, have been found to cause Marfan syndrome, a dominantly inherited disorder characterised by clinically variable skeletal, ocular, and cardiovascular abnormalities. Fibrillin-1 mutations have also been found in several other related connective tissue disorders, such as severe neonatal Marfan syndrome, dominant ectopia lentis, familial ascending aortic aneurysm, isolated skeletal features of Marfan syndrome, and Shprintzen-Goldberg syndrome. Mutations are spread throughout the gene and, with the exception of neonatal Marfan syndrome, show no obvious clustering or phenotypic association.
Insights
Fibrillin-1 gene mutations cause Marfan syndrome and related disorders. These mutations, found throughout the fibrillin-1 (FBN1) gene, lead to varied connective tissue abnormalities.
Area of Science:
- Genetics
- Molecular Biology
- Connective Tissue Diseases
Background:
- Fibrillin is a key protein in extracellular microfibrils, essential for connective tissue integrity.
- Mutations in the fibrillin-1 (FBN1) gene are linked to Marfan syndrome and other connective tissue disorders.
- The FBN1 gene is located on chromosome 15q21.1.
Purpose of the Study:
- To review the spectrum of disorders associated with fibrillin-1 gene mutations.
- To understand the genetic basis of Marfan syndrome and related conditions.
- To explore the relationship between FBN1 mutations and clinical phenotypes.
Main Methods:
- Literature review of genetic studies on fibrillin-1.
- Analysis of mutation data in patients with Marfan syndrome and related disorders.
- Correlation of genotype with clinical manifestations.
Main Results:
- Fibrillin-1 mutations are the primary cause of Marfan syndrome, presenting with diverse skeletal, ocular, and cardiovascular issues.
- Other connective tissue disorders, including neonatal Marfan syndrome, ectopia lentis, and aortic aneurysms, are also associated with FBN1 mutations.
- Mutations are distributed across the FBN1 gene, with no clear clustering or phenotype correlation, except for neonatal Marfan syndrome.
Conclusions:
- Fibrillin-1 gene mutations are central to a range of connective tissue disorders.
- The variability in Marfan syndrome and related conditions highlights the complex genotype-phenotype relationship.
- Further research is needed to fully elucidate the impact of FBN1 mutation location on disease presentation.