Polymorphisms in the CD3Z gene influence TCRzeta expression in systemic lupus erythematosus patients and healthy controls

The Journal of Immunology : Official Journal of the American Association of Immunologists
Claire L GormanTimothy J Vyse

Abstract

TCRzeta (CD247) functions as an amplification module in the TCR signaling cascade and is essential for assembly and surface expression of the TCR/CD3 complex. The TCRzeta-chain is down-regulated in many chronic infectious and inflammatory diseases, including systemic lupus erythematosus (SLE). It is unclear whether reduced TCRzeta expression is a cause or a consequence of chronic inflammatory responses. We have addressed this question by adopting a combined genetic and functional approach. We analyzed TCRzeta protein expression using a FACS-based expression index and documented considerable, but longitudinally stable, variation in TCRzeta expression in healthy individuals. The variation in TCRzeta expression was associated with polymorphisms in the CD3Z 3'-untranslated region (UTR) in SLE patients and healthy controls. Detailed mapping of the 3'-UTR revealed that the minor alleles of two single nucleotide polymorphisms (SNPs) in strong disequilibrium (rs1052230 and rs1052231) were the causal variants associated with low TCRzeta expression (p=0.015). Using allelic imbalance analysis, the minor alleles of these 3'-UTR SNPs were associated with one-third of the level of mRNA compared with the major allele. A family-based associati...Continue Reading

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