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After a decades-long search, scientists identify new genetic risk factors for multiple sclerosis

y at the University of California in San Francisco, and Alastair Compston, FRCP, Ph.D., Head of the Department of Clinical Neurosciences at the University of Cambridge, U.K. The other team, which focused their search on a set of genes they considered potential risk factors for MS, was co-led by Jonathan Haines, Ph.D., Director of the Center for Human Genetics Research at Vanderbilt University Medical Center in Nashville, Tenn. and Margaret A. Pericak-Vance, Ph.D., Director of the Miami Institute for Human Genomics at the University of Miami. Drs. Hauser, Compston, Haines and Pericak-Vance participated in both studies.

MS typically causes limb weakness, vision loss and problems with coordination, and is the most common disabling neurological disorder of young adults. It's an autoimmune disease, occurring when the body's immune system mistakenly attacks a protective sheath around axons the delicate cables that nerve cells use to connect with each other. Various immunosuppressant drugs can reduce symptoms and slow the disease's course, but most MS patients become increasingly disabled with time.

The trigger for MS is unclear, though there's strong evidence for an interplay between genetic susceptibility and some type of environmental factor. Having a relative, especially an identical twin, with MS increases one's risk of developing the disease. In the mid-1970s, researchers discovered that human leukocyte antigens (HLA) account for some of this genetic susceptibility. HLAs are proteins displayed on all the body's cells to help the immune system distinguish self from non-self. A variant of the HLA-DRB1 gene, now widely accepted as the strongest genetic risk factor for MS, increases the likelihood of getting the disease up to four-fold.

Still, HLA does not fully explain the genetic basis of MS; scientists have long realized that other genes must play a role that has been difficult to detect. Some studies have pointed to other HLA
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Contact: Daniel Stimson
stimsond@ninds.nih.gov
301-496-5751
NIH/National Institute of Neurological Disorders and Stroke
29-Jul-2007


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