Epitopes and Subtypes
Anti Scl-70 antibodies (also called anti-topoisomerase I after the type I topoisomerase target) is a type of anti-nuclear autoantibody seen mainly in diffuse systemic scleroderma, but is also seen the more limited form of systemic scleroderma called CREST syndrome. Anti Scl-70 antibodies are associated with more severe scleroderma disease.
Anti-topoisomerase antibodies can be classified according to their immunoglobulin class (IgM, IgG or IgA). IgG-ATA is found most frequently in scleroderma, with IgA being quite common but IgM very infrequent.
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