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Systems medicine links microbial inflammatory response with glycoprotein-associated mortality risk

By Scott C Ritchie, Peter Würtz, Artika P. Nath, Gad Abraham, Aki S Havulinna, Antti J Kangas, Pasi Soininen, Kristiina Aalto, Ilkka Seppälä, Emma Raitoharju, Marko Salmi, Mikael Maksimow, Satu Männistö, Mika Kähönen, Markus Juonala, Terho Lehtimäki, Sirpa Jalkanen, Markus Perola, Olli Raitakari, Veikko Salomaa, Mika Ala-Korpela, Johannes Kettunen, Michael Inouye

Posted 28 Apr 2015
bioRxiv DOI: 10.1101/018655 (published DOI: 10.1016/j.cels.2015.09.007)

Integrative analyses of high-throughput omics data have elucidated the aetiology and pathogenesis for complex traits and diseases, and the linking of omics information to electronic health records promises new insights into human health and disease. Recent nuclear magnetic resonance (NMR) spectroscopy biomarker profiling has implicated glycoprotein acetyls (GlycA) as a biomarker for cardiovascular risk and all-cause mortality. To elucidate biological processes contributing to GlycA- associated mortality risk, we leveraged human omics data from three population- based cohorts together with nation-wide Finnish hospital and mortality records. Elevated GlycA was associated with myriad infection-related inflammatory processes. Within individuals, elevated GlycA levels were stable over long time periods, up to a decade, and chronically elevated GlycA was also associated with modest elevation of numerous cytokines. Individuals with elevated GlycA also showed increased expression of a transcriptional sub-network, the Neutrophil Degranulation Module (NDM), suggesting an increased activity of microbe-driven immune response. Subsequent analysis of nation-wide hospitalisation and death records was consistent with a microbial basis for GlycA-associated mortality, with each standard deviation increase in GlycA raising an individual's future risk of hospitalization and death from non-localized infection by 40% and 136%, respectively. These results show that, beyond its established role in acute-phase response, elevated GlycA is more broadly a biomarker for low-grade chronic inflammation and increased neutrophil activity. Further, increased risk of susceptibility to severe microbial-infection events in healthy individuals suggests this inflammation is a contributor to mortality risk. Taken together, this study demonstrates the power of an integrative approach that combines omics data and health records to delineate the biological processes underlying a newly discovered biomarker, providing a model strategy for future systems medicine studies.

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