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Fibrodysplasia ossificans progressiva why do some people have two skeletons?

E M Shore1, F H Gannon, F S Kaplan

  • 1Departments of Orthopaedic Surgery (E.M.S., F.H.G., F.S.K.), Genetics (E.M.S.), Pathology (F.H.G.), and Medicine (F.S.K.), The University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania.

Journal of Clinical Rheumatology : Practical Reports on Rheumatic & Musculoskeletal Diseases
|December 17, 2008
PubMed

Insights

Fibrodysplasia ossificans progressiva (FOP) causes a second skeleton to form after birth. Research suggests Bone Morphogenetic Protein 4 (BMP-4) may play a key role in this rare genetic disorder.

Area of Science:

  • Genetics
  • Developmental Biology
  • Orthopedics

Background:

  • Fibrodysplasia ossificans progressiva (FOP) is an exceptionally rare genetic disorder characterized by the formation of a heterotopic skeleton.
  • Patients with FOP develop a secondary skeleton postnatally, in addition to their normal embryonic skeleton.
  • While the FOP phenotype, including congenital great toe malformations, is consistent, disease severity varies significantly.

Purpose of the Study:

  • To investigate the genetic causes of Fibrodysplasia ossificans progressiva (FOP).
  • To explore the role of Bone Morphogenetic Proteins (BMPs) as candidate genes for heterotopic osteogenesis disorders.
  • To elucidate the function of BMP-4 in the pathophysiology of FOP.

Main Methods:

  • Candidate gene approach to identify the genetic basis of FOP.
  • Overexpression studies of BMP-4 in patient-derived cells.
  • Analysis of genetic and cellular pathways activated in FOP.

Main Results:

  • Overexpression of BMP-4 in cells from FOP patients was found to be associated with the disorder.
  • BMP-4 is implicated in the pathophysiology of Fibrodysplasia ossificans progressiva.

Conclusions:

  • Bone Morphogenetic Proteins (BMPs) are critical regulators of skeletal development and potential candidates for FOP research.
  • Further analysis of BMP-4 and associated pathways is crucial for understanding ectopic bone formation in FOP.
  • Elucidating these pathways may lead to improved treatments for both orthotopic and heterotopic osteogenesis.

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