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• W2894902423 abstract "Background Whole blood expression profiling is a mainstay for delineating differential diagnostic signatures of infection yet is subject to high variability that reduces power and complicates clinical usefulness. To date confirmatory high confidence expression profiling signatures for clinical use, remain uncertain. Here we have sought to evaluate the reproducibility and confirmatory nature of differential expression signatures, comprising molecular and cellular pathways, across multiple international clinical observational studies investigating children and adult whole blood transcriptome responses to tuberculosis (TB). Methods and findings A systematic search and quality control assessment of gene expression repositories for human tuberculosis using whole blood resulted in 11 datasets with a total of 1073 subjects from Africa, Europe and South America. A non-parametric estimation of percentage of false prediction was used for meta-analysis of high confidence differential expression analysis. Deconvolution analysis was applied to infer changes in immune cell proportions and enrichment tests applied using pathway database resources. Meta-analysis identified high-confidence differentially expressed genes, comprising 372 in adult active-TB vs latent-TB (LTBI), 332 in adult active-TB vs controls (CON), 5 in LTBI vs CON and 415 in childhood active-TB vs LTBI. Notably these confirmatory markers have low representation in published signatures for diagnosing TB. Pathway biology analysis of high confidence gene sets revealed dominant metabolic and innate-immune pathway signatures while suppressed signatures were enriched with adaptive signalling pathways and reduced proportions of T and B cells. Childhood TB showed uniquely strong inflammasome antagonist signature (IL1RN and ILR2), while adult TB patients exhibit a significant preponderance type I and type II IFN markers. Key limitations of the study include the paucity of data on potential confounders. Conclusions Meta-analysis identified high confidence confirmatory immune-metabolic and cellular expression signatures across studies regardless of the population resource setting, HIV status and circulating endemic pathogens. Notably, previously identified diagnostic signature markers for TB show limited concordance with the confirmatory meta-analysis. Overall, our results support the use of the confirmatory expression signatures for guiding optimised diagnostic, prognostic and therapeutic monitoring modalities in TB." @default.
• W2894902423 created "2018-10-12" @default.
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• W2894902423 date "2018-10-04" @default.
• W2894902423 modified "2023-10-18" @default.
• W2894902423 title "Meta-Analysis Identification of Highly Robust and Differential Immune-Metabolic Signatures of Systemic Host Response to Acute and Latent Tuberculosis in Children and Adults" @default.
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• W2894902423 doi "https://doi.org/10.3389/fgene.2018.00457" @default.
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