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Researchers discover new clinical syndrome leading to severe osteoarthritis

Researchers from Case Western Reserve University School of Medicine and University Hospitals of Cleveland, and the University of California, San Diego have discovered a new clinical syndrome which they have named hereditary chondrolysis, a rare disabling disease in which the cartilage debonds from bone, leading to severe generalized osteoarthritis. The findings, presented at the 50th Annual Meeting of the Orthopedic Research Society in San Francisco in March, may shed light on cartilage breakdown and forms of osteoarthritis.

The researchers uncovered two mutations involving the FRZB ("frisbee") gene located on chromosome 2, which has been implicated in familial osteoarthritis. In previous laboratory studies done elsewhere, FRZB appears to be important in the development of human limbs at a young age. Although the finding of the mutation in both affected and unaffected family members makes the mutation in and of itself insufficient to cause the clinical syndrome, it may play a role in what could be a polygenic trait.

"Further studies defining the genetic mutation related to chondrolysis seen in the family we reported have the potential not only for providing targets for approaches to treatment in the family, but may provide important information as to mechanisms of cartilage degeneration seen in the millions of individuals who suffer from primary osteoarthritis," said Roland Moskowitz, M.D., one of the investigators and a professor of medicine at Case and UHC. "The known relationship of the FRZB gene to embryonic skeletal development, and the observation by others that women with hip osteoarthritis have an increased frequency of this gene add to the significance of our observations," said Moskowitz, a leading expert on osteoarthritis.

The researchers made the findings after screening seven families with familial osteoarthritis looking for specific gene mutations. They discovered a family referred from elsewhere wherein the father, two
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Contact: George Stamatis
George.Stamatis@case.edu
216-368-3635
Case Western Reserve University
3-May-2004


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