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RNAseq Reveals Virulence-Specific Host Responses to M. tuberculosis infection

ABSTRACT: We infect bone marrow derived macrophages (BMDMs) with either a Hyper or Hypovirulent Mycobacterium tuberculolsis strain and assess the host response to these bacteria through RNAseq

ORGANISM(S): Mus musculus

PROVIDER: GSE78706 | GEO | 2016/03/01

SECONDARY ACCESSION(S): PRJNA313266

REPOSITORIES: GEO

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RNAseq Reveals Virulence-Specific Host Responses to M. tuberculosis infection

Project description:We infect bone marrow derived macrophages (BMDMs) with either a Hyper or Hypovirulent Mycobacterium tuberculolsis strain and assess the host response to these bacteria through RNAseq Uninfected BMDMs served as controls, BMDMs infected with Hypervirulent M.tb (designated R55), BMDMs infected with Hypovirulent m.tb (designated R50). 3 groups with 3 biological replicates, each analysed in triplicate.

2016-03-01 | E-GEOD-78706 | biostudies-arrayexpress

The Host Response to a Clinical MDR Mycobacterial Strain Cultured in a Detergent-Free Environment: A Global Transcriptomics Approach

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Project description:The distinguishing factors that characterize the host response to infection with virulent Mycobacterium tuberculosis (M.tb) are largely confounding. We present an infection study with 2 genetically closely related M.tb strains that have vastly different pathogenic characteristics. The early host response to infection with these detergent-free cultured strains was analyzed through RNAseq in an attempt to provide information on the subtleties which may ultimately contribute to the virulent phenotype. Murine bone marrow derived macrophages (BMDMs) were infected with either a hyper- (R5527) or hypovirulent (R1507) Beijing M. tuberculosis clinical isolate. RNAseq revealed 69 differentially expressed host genes in BMDMs during comparison of these 2 transcriptomes. Pathway analysis revealed activation of the stress-induced and growth inhibitory Gadd45 signaling pathway in hypervirulent infected BMDMs. Upstream regulators of interferon activation such as and IRF3 and IRF7 were predicted to be upregulated in hypovirulent-infected BMDMs. Additional analysis of the host immune response through ELISA and qPCR included the use of human THP-1 macrophages where a robust proinflammatory response was observed after infection with the hypervirulent strain. RNAseq revealed 2 early-response genes (ier3 and saa3) and 2 host-defense genes (oasl1 and slpi) that were significantly upregulated by the hypervirulent strain. The role of these genes under M.tb infection conditions are largely unknown but here we provide validation of their presence with use of qPCR and Western blot. Further analysis into their biological role during infection with virulent M.tb is required.

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