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Related Experiment Videos

Heterozygous mutations in the gene encoding noggin affect human joint morphogenesis.

Y Gong1, D Krakow, J Marcelino

  • 1Department of Genetics and Center for Human Genetics, Case Western Reserve University School of Medicine and University Hospitals of Cleveland, Ohio, USA.

Nature Genetics
|March 18, 1999
PubMed
Summary

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The secreted protein noggin is crucial for proper joint formation. Mutations in the NOG gene cause skeletal abnormalities like joint fusion in humans and mice.

Area of Science:

  • Developmental biology
  • Genetics
  • Skeletal biology

Background:

  • The secreted polypeptide noggin (Nog) inhibits transforming growth factor beta superfamily members (TGFbeta-FMs), like BMP4.
  • Noggin's efficient diffusion suggests a role in creating morphogenic gradients during embryonic development.
  • Nog gene expression occurs at multiple sites during mouse embryogenesis, including developing bones.

Purpose of the Study:

  • To investigate the role of noggin in skeletal development and joint formation.
  • To identify human NOG mutations associated with skeletal disorders.

Main Methods:

  • Identification of dominant human NOG mutations in families with proximal symphalangism (SYM1) and multiple synostoses syndrome (SYNS1).
  • Analysis of a de novo NOG mutation in a patient with unaffected parents.

Related Experiment Videos

  • Examination of evolutionary conservation of mutated amino acid residues.

    • Main Results:

    • Five dominant NOG mutations were identified in families with SYM1.
    • A de novo NOG mutation was found in a patient with unaffected parents.
    • A dominant NOG mutation was identified in a family with SYNS1.
    • All seven identified NOG mutations affect evolutionarily conserved amino acid residues.
    • Noggin is essential for joint formation, with mutations leading to joint fusion.

    Conclusions:

    • NOG mutations are causative for proximal symphalangism and multiple synostoses syndrome.
    • The study confirms NOG's essential role in joint formation.
    • Skeletal development requirements for noggin may vary across species and skeletal elements.