Comprehensive plasma proteomic profiling reveals biomarkers for active tuberculosis
Diana J. Garay-Baquero, … , Spiros D. Garbis, Paul Elkington
Diana J. Garay-Baquero, … , Spiros D. Garbis, Paul Elkington
Published August 11, 2020
Citation Information: JCI Insight. 2020;5(18):e137427. https://doi.org/10.1172/jci.insight.137427.
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Clinical Medicine Infectious disease

Comprehensive plasma proteomic profiling reveals biomarkers for active tuberculosis

Abstract

BACKGROUND Tuberculosis (TB) kills more people than any other infection, and new diagnostic tests to identify active cases are required. We aimed to discover and verify novel markers for TB in nondepleted plasma.METHODS We applied an optimized quantitative proteomics discovery methodology based on multidimensional and orthogonal liquid chromatographic separation combined with high-resolution mass spectrometry to study nondepleted plasma of 11 patients with active TB compared with 10 healthy controls. Prioritized candidates were verified in independent UK (n = 118) and South African cohorts (n = 203).RESULTS We generated the most comprehensive TB plasma proteome to date, profiling 5022 proteins spanning 11 orders-of-magnitude concentration range with diverse biochemical and molecular properties. We analyzed the predominantly low–molecular weight subproteome, identifying 46 proteins with significantly increased and 90 with decreased abundance (peptide FDR ≤ 1%, q ≤ 0.05). Verification was performed for novel candidate biomarkers (CFHR5, ILF2) in 2 independent cohorts. Receiver operating characteristics analyses using a 5-protein panel (CFHR5, LRG1, CRP, LBP, and SAA1) exhibited discriminatory power in distinguishing TB from other respiratory diseases (AUC = 0.81).CONCLUSION We report the most comprehensive TB plasma proteome to date, identifying novel markers with verification in 2 independent cohorts, leading to a 5-protein biosignature with potential to improve TB diagnosis. With further development, these biomarkers have potential as a diagnostic triage test.FUNDING Colciencias, Medical Research Council, Innovate UK, NIHR, Academy of Medical Sciences, Program for Advanced Research Capacities for AIDS, Wellcome Centre for Infectious Diseases Research.

Authors

Diana J. Garay-Baquero, Cory H. White, Naomi F. Walker, Marc Tebruegge, Hannah F. Schiff, Cesar Ugarte-Gil, Stephen Morris-Jones, Ben G. Marshall, Antigoni Manousopoulou, John Adamson, Andres F. Vallejo, Magdalena K. Bielecka, Robert J. Wilkinson, Liku B. Tezera, Christopher H. Woelk, Spiros D. Garbis, Paul Elkington

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Figure 6

Novel TB biomarkers are validated in an independent UK cohort of mixed ethnicity.

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Novel TB biomarkers are validated in an independent UK cohort of mixed e...
Two novel TB biomarkers were significantly upregulated in TB infection measured by Luminex or ELISA in serum from an independent UK-based cohort. (A) CFHR5 is increased in TB and also significantly increased in other respiratory diseases (ORDs). ATBI, active TB infection. Four known TB potential markers were measured and were significantly elevated in TB: (B) LRG1, (C) LBP, (D) SAA1, and (E) CRP. (F) ILF2, a novel analyte from segment 3, was elevated in TB and ORDs. Box displays 25% and 75% percentiles with line showing median and whiskers displaying minimum to maximum values. Differences were considered significant when P < 0.05 and calculated from Kruskal-Wallis test and Dunn’s multiple-comparisons test. HC, healthy controls (n = 30); LTBI, latent TB infection (n = 30); PTBI, pulmonary TB infection (n = 32); ORD, other respiratory diseases (n = 26).