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C-reactive protein upregulates the whole blood expression of CD59 - an integrative analysis

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  • Kaido Lepik
  • Tarmo Annilo
  • Viktorija Kukuškina
  • eQTLGen Consortium
  • Kai Kisand
  • Zoltán Kutalik
  • Pärt Peterson
  • Hedi Peterson

Abstract

Elevated C-reactive protein (CRP) concentrations in the blood are associated with acute and chronic infections and inflammation. Nevertheless, the functional role of increased CRP in multiple bacterial and viral infections as well as in chronic inflammatory diseases remains unclear. Here, we studied the relationship between CRP and gene expression levels in the blood in 491 individuals from the Estonian Biobank cohort, to elucidate the role of CRP in these inflammatory mechanisms. As a result, we identified a set of 1,614 genes associated with changes in CRP levels with a high proportion of interferon-stimulated genes. Further, we performed likelihood-based causality model selection and Mendelian randomization analysis to discover causal links between CRP and the expression of CRP-associated genes. Strikingly, our computational analysis and cell culture stimulation assays revealed increased CRP levels to drive the expression of complement regulatory protein CD59, suggesting CRP to have a critical role in protecting blood cells from the adverse effects of the immune defence system. Our results show the benefit of integrative analysis approaches in hypothesis-free uncovering of causal relationships between traits.Author summary: Chronic inflammation is associated with chronic diseases, morbidity and mortality while lower base inflammation levels are thought to be predictive of healthy aging. Thus, to pursue a long and healthy lifespan, it is essential to understand the inflammatory regulatory mechanisms. To that end, we studied the functional role of C-reactive protein (CRP)–an inflammatory biomarker that is used to measure cardiovascular risk in clinical practice. There is evidence for a strong genetic component of elevated CRP levels but it is still unclear if it has a direct impact on the processes that lead to inflammatory diseases. In order to elucidate the function of CRP in the blood, we used statistical methods for causal inference to infer causal relationships between changes in CRP and gene expression levels. Our statistical analysis and cell culture experiments suggest that CRP drives the expression of complement regulatory protein CD59. Thus, CRP can have a functional role in protecting human blood cells from the adverse effects of the immune defence system.

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  • Kaido Lepik & Tarmo Annilo & Viktorija Kukuškina & eQTLGen Consortium & Kai Kisand & Zoltán Kutalik & Pärt Peterson & Hedi Peterson, 2017. "C-reactive protein upregulates the whole blood expression of CD59 - an integrative analysis," PLOS Computational Biology, Public Library of Science, vol. 13(9), pages 1-20, September.
    • Handle: RePEc:plo:pcbi00:1005766
    DOI: 10.1371/journal.pcbi.1005766
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