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Fibrillln mutations in Marfan syndrome and related phenotypes
1Brookdale Center for Molecular Biology, Mount Sinai School of Medicine, New York, New York 10029, USA. ramirez@mavax.mssm.edu
Abstract:
A casual association has been established between mutations in the fibrillin 1 gene and Marfan syndrome and related phenotypes. Analysis of mutations in these disease types has provided new insights into microfibril assembly and function. These include evidence for a mutation in a fibrillin 1 domain associated with severe phenotype; indication of profibrillin processing by a furin-like endoprotease; linkage between extracellular processing and fibrillin 1 polymerization; and involvement of calcium binding in monomer stabilization and microfibril assembly. Identification of intragenic DNA polymorphisms and determination of intron/exon junction sequences have significantly improved our ability to diagnose Marfan syndrome and to detect fibrillin 1 mutations. Additional work has provided strong evidence for structural and functional heterogeneity of microfibrillin. The evidence includes the identification of fibrillin 2, a microfibrillar component structurally related to fibrillin 1; the differential pattern of gene expression of the two fibrillin; and the association of fibrillin 2 mutations with congenital contractural arachnodactyly.
Insights
Mutations in the fibrillin 1 gene are linked to Marfan syndrome. Research reveals insights into microfibril assembly, processing, and the discovery of fibrillin 2, impacting genetic diagnosis and understanding of related conditions.
Area of Science:
- Genetics
- Molecular Biology
- Biochemistry
Background:
- Marfan syndrome is associated with fibrillin 1 gene mutations.
- Microfibrils play crucial roles in tissue structure and function.
- Understanding fibrillin gene mutations is key to diagnosing and treating related disorders.
Purpose of the Study:
- To investigate the functional consequences of fibrillin 1 gene mutations.
- To elucidate the mechanisms of microfibril assembly and processing.
- To explore the role of fibrillin 2 in microfibril structure and associated phenotypes.
Main Methods:
- Analysis of fibrillin 1 gene mutations in patients with Marfan syndrome and related phenotypes.
- Biochemical studies on profibrillin processing and fibrillin polymerization.
- Identification of DNA polymorphisms and sequencing of intron/exon junctions for diagnostic purposes.
- Characterization of fibrillin 2 and its gene expression patterns.
Main Results:
- Identified specific fibrillin 1 mutations linked to severe Marfan syndrome phenotypes.
- Demonstrated profibrillin processing by a furin-like endoprotease and its linkage to fibrillin 1 polymerization.
- Confirmed the involvement of calcium binding in monomer stabilization and microfibril assembly.
- Discovered fibrillin 2, a related microfibrillar component, with differential gene expression and mutations associated with congenital contractural arachnodactyly.
Conclusions:
- Fibrillin 1 mutations provide critical insights into microfibril assembly and function.
- Advanced diagnostic capabilities for Marfan syndrome through genetic analysis.
- Established structural and functional heterogeneity of microfibrillin, highlighting the distinct roles of fibrillin 1 and fibrillin 2.