E! Science News -- Genes reside along long chains of DNA called chromosomes. UCLA researchers have found that a variation in a gene on the sex chromosome X may enhance an immune response that leads to lupus in men. Systemic lupus erythematosus (SLE) is an autoimmune disease that predominantly affects women. Interestingly, researchers found that although the variation occurred in a gene on the X, or female, chromosome, its influence was stronger in men than in women. Humans hold two sex chromosomes — men have an X and Y, while women have two Xs. Previous studies have shown that genetic variations on the X chromosome contribute to the development of lupus.
