Fibrodysplasia Ossificans Progressiva (FOP)
You are reading a NORD Rare Disease Report Abstract. NORD’s full collection of reports on over 1200 rare diseases is available to subscribers (click here for details). We are now also offering two full rare disease reports per day to visitors on our Web site.
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
- No subdivisions found.
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 (FOP)
The information in NORD’s Rare Disease Database is for educational purposes only. It should never be used for diagnostic or treatment purposes. If you have questions regarding a medical condition, always seek the advice of your physician or other qualified health professional. NORD’s reports provide a brief overview of rare diseases. For more specific information, we encourage you to contact your personal physician or the agencies listed as “Resources” on this report.
The National Organization for Rare Disorders (NORD) web site, its databases, and the contents thereof are copyrighted by NORD. No part of the NORD web site, databases, or the contents may be copied in any way, including but not limited to the following: electronically downloading, storing in a retrieval system, or redistributing for any commercial purposes without the express written permission of NORD. Permission is hereby granted to print one hard copy of the information on an individual disease for your personal use, provided that such content is in no way modified, and the credit for the source (NORD) and NORD’s copyright notice are included on the printed copy. Any other electronic reproduction or other printed versions is strictly prohibited.
Copyright 1987, 1990, 1996, 2002, 2006, 2008, 2011
NORD's Rare Disease Information Database is copyrighted and may not be published without the written consent of NORD.