Diabetes, Vol 46, Issue 2 161-168, Copyright © 1997 by American Diabetes Association

ARTICLES

The role of enteroviral infections in the development of IDDM: limitations of current approaches

PM Graves, JM Norris, MA Pallansch, IC Gerling and M Rewers
Department of Preventive Medicine and Biometrics, School of Medicine, University of Colorado, Denver, USA.

Enteroviruses have been examined for their possible role in the etiology of IDDM for nearly 40 years, yet the evidence remains inconclusive. The mechanism of acute cytolytic infection of beta-cells, proposed by earlier studies, appears to be incompatible with the long preclinical period of autoimmunity preceding IDDM. Advances in molecular biology have improved our understanding of enteroviral biology and of potential alternative pathogenic mechanisms through which enteroviruses may cause diabetes. The focus of future human studies will likely shift from people with IDDM to those with prediabetic autoimmunity to determine whether acute enteroviral infections can promote progression from autoimmunity to overt diabetes. We propose that such studies use assays to detect enteroviral RNA, in addition to IgM serology. RNA assays can overcome sensitivity and type-specificity limitations of IgM assays as well as identify diabetogenic strains of enteroviruses, if such exist. Evaluation of the role of enteroviruses in triggering beta-cell autoimmunity in humans will require large prospective studies of young children. The Diabetes Autoimmunity Study in the Young--one of very few such studies currently underway--is focusing on potential interactions between HLA class II genes and enteroviral infections. Future studies will likely examine interactions between viral infections and non-HLA IDDM candidate genes, including those that may determine beta-cell tropism of candidate viruses.
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