n another major breakthrough, scientists have discovered the importance of a substance called citrulline as a target for immune attack in rheumatoid arthritis (RA). This immune system antibody associated with rheumatoid arthritis recognizes citrulline, which seems to be a key player in the condition. Indeed, the HLA associations with RA have now been shown by Dr. Gregersen and others to directly regulate the immune response to proteins containing citrulline. Citrulline is formed when a specific enzyme comes in contact with arginine, one of 20 common amino acids in proteins. When one of the enzymes is present, nitrogen is removed from the chemical structure of arginine and it converts into citrulline.
Laboratories have developed a test to measure for anti-cyclic citrullinated peptide antibody, or anti-CCP. It is now being used as a diagnostic for rheumatoid arthritis. Scientists are now finding that patients have CCP antibodies months or years prior to the illness, suggesting a way to identify the disease before it starts and perhaps offer treatments to stave off the symptoms. It turns out that those with these antibodies who also have a particular variety of HLA, a complex of genes that regulate immune function, have a 30 times higher risk of developing rheumatoid arthritis than those without these genetic risk factors.
Scientists at the University of Colorado are now analyzing the genes from 2,500 first degree relatives of rheumatoid arthritis patients and testing CCP levels to see whether there is a way to predict, based on these measurements, who will go on to develop rheumatoid arthritis.
Ultimately, understanding how the genes work to confer illness will help in the development of new treatments.
Normal Control Genetic Database
In addition, The Feinstein Institute is participating in a groundbreaking effort to release large amounts of genetic data on normal subjects for use by the scientific comPage: 1 2 3 4 Related biology news :1
Source:North Shore-Long Island Jewish (LIJ) Health System
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