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Related Experiment Videos

The fibrillins.

F Ramirez1, L Pereira

  • 1Brookdale Center for Developmental and Molecular Biology, Mount Sinai School of Medicine, New York, NY 10029, USA. ramirf@doc.mssm.edu

The International Journal of Biochemistry & Cell Biology
|April 27, 1999
PubMed
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Fibrillins 1 and 2 are key proteins in extracellular microfibrils, essential for tissue biomechanics. Mutations cause Marfan syndrome and congenital contractural arachnodactyly, highlighting their distinct roles in development and disease.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Genetics

Background:

  • Fibrillins 1 and 2 are major components of extracellular microfibrils, crucial for tissue biomechanical properties.
  • These cysteine-rich glycoproteins contain calcium-binding epidermal growth factor-like modules and polymerize extracellularly.
  • Fibrillin-1 mutations are linked to Marfan syndrome, while fibrillin-2 alterations cause congenital contractural arachnodactyly.

Purpose of the Study:

  • To elucidate the distinct and overlapping roles of fibrillin-1 and fibrillin-2 in tissue morphogenesis and homeostasis.
  • To investigate the hypothesized roles of fibrillin-2 in elastogenesis and fibrillin-1 in structural support.
  • To utilize mouse models for studying fibrillin contributions and testing aneurysm therapies.

Main Methods:

Related Experiment Videos

  • Analysis of fibrillin structure, polymerization, and calcium binding.
  • Investigating the effects of fibrillin-1 and fibrillin-2 mutations in genetic disorders.
  • Employing gene targeting in mouse models to study fibrillin functions in vivo.

Main Results:

  • Fibrillins polymerize extracellularly into head-to-tail monomer bundles, with calcium binding rigidifying their structure.
  • Distinct mutations in fibrillin-1 and fibrillin-2 lead to specific connective tissue disorders.
  • Mouse models are providing insights into the specific contributions of each fibrillin to tissue development and maintenance.

Conclusions:

  • Fibrillin-1 and fibrillin-2 play critical, yet distinct, roles in tissue structure, development, and disease.
  • Understanding fibrillin function is vital for addressing connective tissue disorders like Marfan syndrome.
  • Mouse models offer valuable platforms for therapeutic development targeting aortic aneurysms and matrix integrity.