The Journal of Experimental Medicine
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Published 19 September 2005. doi:10.1084/jem.20050693
Rockefeller University Press, 0022-1007 $8.00
JEM, Volume 202, Number 6, 805-815
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ARTICLE

 Modifier loci condition autoimmunity provoked by Aire deficiency

Wenyu Jiang1, Mark S. Anderson1, Roderick Bronson2, Diane Mathis1, and Christophe Benoist1

1 Section on Immunology and Immunogenetics, Joslin Diabetes Center, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02215
2 Harvard Medical School, Boston, MA 02115

CORRESPONDENCE Christophe Benoist and Diane Mathis: cbdm{at}joslin.harvard.edu

Loss of function mutations in the autoimmune regulator (Aire) gene in autoimmune polyendocrinopathy-candidiasis-ectodermal dystrophy patients and mutant mice lead to autoimmune manifestations that segregate as a monogenic trait, but with wide variation in the spectrum of organs targeted. To investigate the cause of this variability, the Aire knockout mutation was backcrossed to mice of diverse genetic backgrounds. The background loci strongly influenced the pattern of organs that were targeted (stomach, eye, pancreas, liver, ovary, thyroid, and salivary gland) and the severity of the targeting (particularly strong on the nonobese diabetic background, but very mild on the C57BL/6 background). Autoantibodies mimicked the disease pattern, with oligoclonal reactivity to a few antigens that varied between Aire-deficient strains. Congenic analysis and a whole genome scan showed that autoimmunity to each organ had a distinctive pattern of genetic control and identified several regions that controlled the pattern of targeting, including the major histocompatibility complex and regions of Chr1 and Chr3 previously identified in controlling type 1 diabetes.

Abbreviations used: AIRE, autoimmune regulator; APECED, autoimmune polyendocrinopathy-candidiasis- ectodermal dystrophy; autoAb, autoantibody; BALT, bronchial-associated lymph tissue; LOD, logarithm of the odds; NOD, nonobese diabetic; SNP, single nucleotide polymorphism; T1D, type 1 diabetes.

W. Jiang and M.S. Anderson contributed equally to this work.

M.S. Anderson's present address is Diabetes Center, University of California, San Francisco, San Francisco, CA 94143.


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