Abstract
This study aimed to test the functional effects of the PD1.3 single nucleotide polymorphism (SNP) (rs11568821), which were proposed based on its association to systemic lupus erythematosus (SLE) susceptibility and in electrophoretic mobility shift assays (EMSA) results. We analysed transcriptional effects of the PD1.3 locus by enhancer reporter assays. Results were against the hypothesis that the PD1.3 locus acts as enhancer in transcriptional regulation of PDCD1. In addition, they excluded a differential effect of the PD1.3 alleles. EMSA results confirmed that oligonucleotides with the PD1.3 G allele bind RUNX1 but not those with the A allele. However, binding to PD1.3 G oligonucleotides was much lower than binding to positive control oligonucleotides. Criss-cross experiments showed that this was due to flanking nucleotides in the PD1.3 sequence that negatively affect RUNX1 binding. These results cast doubts on the functional relevance of the PD1.3 SNP and, together with the lack of association in several studies, put into question its role as an SLE susceptibility factor. Investigation of other PDCD1 polymorphisms is needed to uncover the possible effect of this gene on SLE susceptibility.
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Acknowledgements
We thank Samuel Seoane-Ruzo (University of Santiago) for help with luciferase assays and Miguel A Iñiguez-Peña (Centro de Biologia Molecular, Madrid) for providing us with a working protocol for Jurkat cell transfection. This work was supported by two Grants, PI04/1615 and PI06/0620, from the Instituto de Salud Carlos III (ISCIII, Spanish Health Ministry), which included funds from the FEDER programme of the European Union. MAS-G is the recipient of a pre-doctoral bursary from the Spanish Ministry of Education and Culture. IF-V is the recipient of an ISCIII pre-doctoral bursary. AG has been the recipient of a Research contract from the ISCIII.
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Suarez-Gestal, M., Ferreiros-Vidal, I., Ortiz, J. et al. Analysis of the functional relevance of a putative regulatory SNP of PDCD1, PD1.3, associated with systemic lupus erythematosus. Genes Immun 9, 309–315 (2008). https://doi.org/10.1038/gene.2008.19
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DOI: https://doi.org/10.1038/gene.2008.19
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