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Dominant-negative loss of function arises from a second, more frequent variant within the SAND domain of autoimmune regulator (AIRE).
Journal of Autoimmunity 2018 March
A genetic variant in the SAND domain of autoimmune regulator (AIRE), R247C, was identified in a patient with type I diabetes mellitus (T1DM) and his mother with rheumatoid arthritis. In vitro, the variant dominantly inhibited AIRE; however, typical features of Autoimmune Polyendocrinopathy Candidiasis and Ectodermal Dysplasia (APECED) were not seen in the subjects. Rather, early manifestation of autoimmunity appeared to be dependent on additional genetic factors. On a population level, diverse variants were identified in this region. Surprisingly, many likely pathogenic variants were seen disproportionately in Africans when compared to Europeans, reinforcing the importance of these variants in altering the immune repertoire. In light of these findings, we propose that R247C and other variants within the SAND-domain alter protein function in a dominant fashion and hold potential as drivers of autoimmunity.
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