Supplement: Too Much to Untangle

Too Much to Untangle By Michael Szpir Genes and the environment both contribute to autoimmune diseases, and future advances could come from studying these factors in combination. ARTICLE EXTRAS Ultraviolet Light and Lupus Drugs, Diet, and Lupus Smoking and Rheumatoid Arthritis Iodine and Autoimmune Thyroid Disease Ultraviolet Light and Dermatomyositis Why anyone develops an autoimmune disease is

Michael Szpir

Why anyone develops an autoimmune disease is one of the central puzzles in immunology. Scientists recognize that genetic and environmental factors play a role, "but how these two interact to cause autoimmunity is still a mystery," says Yaron Tomer, a professor of medicine at the University of Cincinnati.

The mystery unfolds with this observation: Even in autoimmune diseases considered to have a strong genetic component, the concordance rate in identical twins is often relatively low. For example, the concordance for monozygotic twins with multiple sclerosis is around 30%, for rheumatoid arthritis (RA) between 12% and 30%, and for systemic lupus...

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