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Fibrodysplasia Ossificans Progressiva

Abstract

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NORD is very grateful to Frederick S. Kaplan, MD, Isaac & Rose Nassau Professor of Orthopaedic Molecular Medicine; Chief, Division of Orthopaedic Molecular Medicine and Director, Center for Research in FOP & Related Disorders, The Perelman School of Medicine at The University of Pennsylvania, and Eileen M. Shore, PhD, Professor of Orthopaedic Molecular Medicine and Genetics and Co-Director of The Center for Research in FOP & Related Disorders, The Perelman School of Medicine at The University of Pennsylvania, for assistance in the preparation of this report.

Synonyms of Fibrodysplasia Ossificans Progressiva

  • FOP
  • myositis ossificans progressiva

Disorder Subdivisions

  • No subdivisions found.

General Discussion

Fibrodysplasia ossificans progressiva (FOP) is a very rare inherited connective tissue disorder characterized by the abnormal development of bone in areas of the body where bone is not normally present (heterotopic ossification), such as the ligaments, tendons, and skeletal muscles. Specifically, this disorder causes the body's skeletal muscles and soft connective tissues to undergo a metamorphosis, essentially a transformation into bone, progressively locking joints in place and making movement difficult or impossible. FOP is characterized by malformed big toes that are present at birth (congenital). Other skeletal malformations of the cervical spine and ribs and the abnormal development of bone at multiple soft tissue sites may lead episodically to stiffness in affected areas, limited movement, and eventual ankylosis of affected joints (neck, shoulders, elbows, hips knees, wrists, ankles, jaw, often in that order).

Episodic flare-ups (pre-osseous soft tissue swellings) of FOP usually begin during early childhood and progress throughout life. Most cases of FOP occur as the result of a sporadic new mutation. The genetic mutation that results in this disorder has been identified. FOP is caused by the mutation of a gene in the bone morphogenetic protein (BMP) pathway, which is important during the formation of the skeleton in the embryo and the repair of the skeleton following birth.

Organizations related to Fibrodysplasia Ossificans Progressiva

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