The Journal of Experimental Medicine
BioLegend: Antibody Reagents
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Published 20 January 2004. doi:10.1084/jem.20031677
Rockefeller University Press, 0022-1007 $8.00
JEM, Volume 199, Number 2, 155-166
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Medullary Epithelial Cells of the Human Thymus Express a Highly Diverse Selection of Tissue-specific Genes Colocalized in Chromosomal Clusters

Jörn Gotter1, Benedikt Brors2, Manfred Hergenhahn3, and Bruno Kyewski1

1 Tumor Immunology Program, German Cancer Research Center, D-69120 Heidelberg, Germany
2 Intelligent Bioinformatics Systems, German Cancer Research Center, D-69120 Heidelberg, Germany
3 Genetic Alterations in Carcinogenesis, German Cancer Research Center, D-69120 Heidelberg, Germany

Address correspondence to Bruno Kyewski, Div. of Cellular Immunology, Tumor Immunology Program, German Cancer Research Center, INF 280, D-69120 Heidelberg, Germany. Phone: 49-6221-423-734; Fax: 49-6221-423-702; email: b.kyewski{at}dkfz.de

Promiscuous expression of tissue-specific self-antigens in the thymus imposes T cell tolerance and protects from autoimmune diseases, as shown in animal studies. Analysis of promiscuous gene expression in purified stromal cells of the human thymus at the single and global gene level documents the species conservation of this phenomenon. Medullary thymic epithelial cells overexpress a highly diverse set of genes (>400) including many tissue-specific antigens, disease-associated autoantigens, and cancer-germline genes. Although there are no apparent structural or functional commonalities among these genes and their products, they cluster along chromosomes. These findings have implications for human autoimmune diseases, immuno-therapy of tumors, and the understanding of the nature of this unorthodox regulation of gene expression.

Key Words: self-tolerance • autoimmunity • tumor antigens • epigenetics • gene array


Abbreviations used in this paper: AIRE, autoimmune regulator; APS, autoimmune polyglandular syndrome; CDR2, cortical dendritic reticulum antigen 2; cTEC, cortical thymic epithelial cell; DM T1, Diabetes mellitus type 1; EpCAM, epithelial cell adhesion molecule; MBP, myelin basic protein; MOG, myelin-oligodendrocyte–associated glycoprotein; mTEC, medullary thymic epithelial cell; PLP, proteolipid protein; TEC, thymic epithelial cell.

The online version of this article contains supplemental material.


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