The fibrillin-Marfan syndrome connection

Area of Science:

• Extracellular matrix biology
• Connective tissue disorders
• Molecular genetics

Background:

• Marfan syndrome, a connective tissue disorder, was recently linked to mutations in fibrillin.
• Fibrillin proteins form 10 nm microfibrils, crucial components of the extracellular matrix in various tissues.
• These microfibrils associate with elastin in elastic fibers and anchor non-elastic tissues.

Purpose of the Study:

• To investigate the role of fibrillin in Marfan syndrome and related disorders.
• To elucidate the structure and function of fibrillin proteins and 10 nm microfibrils.
• To explore potential regulatory roles of fibrillins beyond structural support.

Main Methods:

• Characterization of fibrillin mutations in Marfan syndrome patients.
• Structural elucidation of fibrillin proteins.
• Analysis of fibrillin's role in the extracellular matrix.

Main Results:

• Fibrillin mutations are a cause of Marfan syndrome.
• Fibrillins are repeated units in a "beads-on-a-string" polymer forming microfibrils.
• Fibrillin possesses EGF calcium-binding motifs, suggesting complex structural and functional properties.

Conclusions:

• Fibrillin is central to understanding Marfan syndrome and related connective tissue disorders.
• The 10 nm microfibrils formed by fibrillins have essential structural and potentially regulatory functions.
• Fibrillin research has significantly advanced extracellular matrix biology and our understanding of genetic disorders.