What is Tissue-Specific Autoantibodies (Multiple Target Antigens)?
Autoantibodies to tissue-specific antigens arise when self-tolerance breaks down, leading the adaptive immune system to generate antibodies against proteins in organs or connective tissue. The Array 5 panel simultaneously screens IgG and IgA reactivity against a defined set of target tissues — typically including thyroid, pancreatic islet, adrenal, ovarian, testicular, parietal cell, myocardial, and connective-tissue antigens, among others. The presence of such antibodies reflects an underlying autoimmune process that may be subclinical or already manifesting as organ dysfunction, and in some cases multiple reactivities coexist, pointing to polyendocrine or systemic autoimmune syndromes.