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?2a). Additional molecules involved in the JAK�CSTAT signalling pathway were identified within the first 134 genes of the ranking list, namely, STAT4 (rank?24), SOCS2 (rank?54), JAK3 (rank?134), and IL2RA (rank?88). To verify differential expression, we performed real-time PCR analysis. For CISH, SOCS3, JAK3, PIM1, IL2RA and MYC, expression differences between TB patients and LTBIs were verified (Fig.?2b). None of these candidates was differentially expressed between TB patients and NIDs (Fig.?2b). Notably, SOCS3 and MYC expression levels were also lower in LTBIs than in NIDs (SOCS3, p?[https://en.wikipedia.org/wiki/E-64 E-64] marker during active TB, and suggest decreased expression of SOCS3 and MYC in T-cells from LTBIs. PIM1, SOCS3, CISH, JAK3, MYC and IL2RA were used for a discriminant analysis to build a classifier signature discriminating between TB patients, LTBIs, and NIDs (see Material and Methods for details) [24]. Classification analyses for TB patients and LTBIs revealed 89% (73/84) prediction accuracy (Fig.?3a), and the relative feature importance score identified IL2RA, JAK3 and SOCS3 as predominant contributors to these results (Fig.?3c). Notably, the comparison between LTBIs (RNA pool of five [http://www.selleckchem.com/products/jq1.html JQ1 molecular weight] donors) and NIDs showed 100% correct prediction for ten comparisons (Fig.?3b), and PIM1 and IL2RA were the most influential factors (Fig.?3d). Different subsets of T-cells may differentially contribute to candidate gene expression, and these differences may confound gene expression analyses [28,29]. Therefore, we determined the expression of candidate genes from TB patients in CD4+ and CD8+ T-cells from six TB patients, but detected no significant differences between CD4+ and CD8+ T-cell subsets (Fig.?4a). Very little is known about SOCS3 expression in human T-cell subpopulations. [http://www.selleckchem.com/products/r428.html R428 chemical structure] Therefore, we isolated na?ve, central memory, effector memory and effector CD4+ and CD8+ subpopulations by FACS. Analyses revealed comparable expression levels of SOCS3 in na?ve and memory T-cells, but slightly lower expression in effector T-cells (Fig.?4b). Our results emphasize a role of cytokine receptor signalling and induction of inhibitory regulators in the T-cell response against M.?tuberculosis. Further experiments will determine how these differences translate into functional changes in the T-cell response during TB. Transcriptome analyses from TB patients and healthy contacts indicate a role of JAK�CSTAT signalling and pathway regulation of T-cells by SOCS family members in TB. There is increasing evidence that immune polarization may affect disease susceptibility in TB [31�C33], and the present study suggests that regulation of cytokine signalling via the JAK�CSTAT pathway may be a crucial step in this process.