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Regulation of limb patterning by extracellular microfibrils.

E Arteaga-Solis1, B Gayraud, S Y Lee

  • 1Brookdale Center, Department of Biochemistry and Molecular Biology, Mount Sinai School of Medicine, New York, NY 10029, USA.

The Journal of Cell Biology
|July 27, 2001
PubMed
Summary
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Fibrillin-2 (Fbn2) deficiency causes syndactyly, a limb defect, by impairing mesenchyme differentiation and interacting with BMP-7 signaling during vertebrate organogenesis.

Area of Science:

  • Developmental Biology
  • Extracellular Matrix
  • Genetics

Background:

  • The extracellular microfibril-elastic fiber network is crucial for vertebrate organogenesis.
  • Fibrillin-2 (Fbn2) is a key component of microfibrils and elastic fibers.

Purpose of the Study:

  • To investigate the role of Fbn2 in vertebrate limb development.
  • To elucidate the contribution of the extracellular matrix to organogenesis.

Main Methods:

  • Generation of Fbn2-null mice using gene targeting.
  • Analysis of limb patterning defects, including syndactyly.
  • Investigation of apoptosis and mesenchyme differentiation in affected tissues.
  • Assessment of interactions with Bone Morphogenetic Protein (BMP) signaling pathways.

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Main Results:

  • Fbn2-null mice exhibit bilateral syndactyly, characterized by digit fusion.
  • Syndactyly is primarily caused by defective mesenchyme differentiation, not reduced apoptosis.
  • Fbn2 deficiency leads to a disorganized extracellular matrix.
  • Double heterozygous mice for Fbn2 and Bmp7 display combined phenotypes, indicating functional interaction.

Conclusions:

  • Fibrillin-2 is essential for normal limb patterning during vertebrate organogenesis.
  • There is a functional interaction between Fbn2-rich microfibrils and BMP-7 signaling in limb development.
  • This study reveals an unexpected link between the extracellular matrix and soluble factors in organogenesis.