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The role of upstream stimulatory factor 1 in the transcriptional regulation of the human TBX21 promoter mediated by the T-1514C polymorphism associated with systemic lupus erythematosus

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Abstract

T-bet is a key regulator for the lineage commitment in CD4+ T helper (Th) 1 cells by activating the hallmark production of interferon-γ. Previously, two single nucleotide polymorphisms (SNPs) in the TBX21 promoter, T-1993C and T-1514C, have been shown by statistic studies to associate with systemic lupus erythematosus (SLE). The effect of −1993 SNP on the Yin Yang 1 transcription factor-mediated promoter activity has been already indicated. This study aimed to investigate roles of the T-1514C SNP on TBX21 transcription and its functional effect by luciferase reporter, electrophoretic mobility shift assay (EMSA), chromatin immunoprecipitation (ChIP) assay, and flow cytometric analysis of intracellular T-bet, IFN-γ, and IL-4 expression in activated CD4+ T cells. The TBX21 promoter carrying −1514C possessed significantly lower transcriptional activity than that of −1514T and was markedly downregulated by the overexpression of upstream stimulatory factor 1 (USF-1) when compared with the promoter carrying −1514T. EMSA indicated that the transcription factor USF-1 was bound to the −1514C allele probe with the affinity higher than that to the −1514T allele probe. ChIP assay suggested that USF-1 bound around −1514 of TBX21 genomic DNA in vivo in the human T cell line Jurkat with −1514C/T. The individuals carrying −1514C allele were determined to have significantly diminished expression of T-bet and IFN-γ and increased IL-4 production in CD4+ T cells compared with those of −1514T allele. The findings demonstrate that the T-1514C polymorphism affects TBX21 gene expression and Th1 cytokine production by binding USF-1 to the SNP site.

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Abbreviations

bp:

Base pair

EMSA:

Electrophoretic mobility shift assay

IFN-γ:

Interferon-γ

IL-4:

Interleukin-4

PCR-RFLP:

Polymerase chain reaction–restriction fragment length polymorphism

SNP:

Single nucleotide polymorphism

SD:

Standard deviation

Th cells:

T helper cells

T-bet:

T-box expressed in T cells

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Acknowledgments

This study is supported by the Chinese National Natural Science Foundation grants (no. 30972595).

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We declare that we have no conflict of interest to disclose.

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Correspondence to Song Chen.

Additional information

Junggang Li and Jirong Li contributed equally to this work.

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Li, J., Li, J., You, Y. et al. The role of upstream stimulatory factor 1 in the transcriptional regulation of the human TBX21 promoter mediated by the T-1514C polymorphism associated with systemic lupus erythematosus. Immunogenetics 64, 361–370 (2012). https://doi.org/10.1007/s00251-011-0597-6

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  • DOI: https://doi.org/10.1007/s00251-011-0597-6

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