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Variable signaling activity by FOP ACVR1 mutations.

Julia Haupt1, Meiqi Xu1, Eileen M Shore2

  • 1Department of Orthopaedic Surgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA; Center for Research in FOP and Related Disorders, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA.

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This summary is machine-generated.

Fibrodysplasia ossificans progressiva (FOP) mutations in ACVR1 receptors show varied BMP signaling. Kinase domain mutations are more sensitive to BMP, and some variants activate pathways independently of ligand binding.

Keywords:
ACVR1BMP signaling activityClassic/variant mutationFibrodysplasia ossificans progressivaHeterotopic ossificationProtein kinase mutation

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Area of Science:

  • Genetics
  • Molecular Biology
  • Biochemistry

Background:

  • Fibrodysplasia ossificans progressiva (FOP) is a rare genetic disorder characterized by heterotopic ossification.
  • Most FOP cases are caused by the ACVR1 R206H mutation, but other ACVR1 mutations exist, correlating with varying disease severity.
  • Previous studies suggested genotype-phenotype correlations, but the molecular mechanisms for functional differences in ACVR1 variant receptors remained unclear.

Purpose of the Study:

  • To investigate the molecular mechanisms underlying functional differences among ACVR1 mutations in FOP.
  • To determine the ligand sensitivity and signaling activation of different ACVR1 FOP mutant receptors.
  • To explore potential ligand-independent activation mechanisms of mutant ACVR1 receptors.

Main Methods:

  • Assessing BMP signaling pathway activation (pSmad1/5/8) in cells expressing different ACVR1 FOP mutant receptors.
  • Comparing the sensitivity of kinase domain and GS domain ACVR1 mutations to varying BMP levels.
  • Evaluating the response of mutant ACVR1 receptors to BMP and Activin A ligands.
  • Analyzing ACVR1 constructs lacking the ligand-binding domain for ligand-independent signaling.

Main Results:

  • ACVR1 mutations in the kinase domain exhibit higher sensitivity to low BMP concentrations compared to GS domain mutations.
  • Cells with FOP ACVR1 mutations respond to both BMP and Activin A ligands.
  • ACVR1 constructs with FOP mutations, even without the ligand-binding domain, show increased BMP-pSmad1/5/8 pathway activation compared to wild-type ACVR1.
  • These findings suggest that mutant ACVR1 receptors can activate signaling pathways through ligand-independent mechanisms.

Conclusions:

  • ACVR1 mutations in FOP exhibit distinct functional properties influencing BMP signaling pathway activation.
  • The location of the mutation within the ACVR1 receptor impacts its sensitivity to BMP ligands.
  • Ligand-independent activation mechanisms contribute to the aberrant signaling observed in FOP, offering potential therapeutic targets.