Project description:In our rabbit model of pulmonary tuberculosis, infection with Mtb HN878, a hyper-virulent W-Beijing strain, results in progressive cavitary disease. However, infection of rabbit lungs with Mtb CDC1551, a hyper-immunogenic strain is effectively controlled overtime, establishing latent Mtb infection. Using these two Mtb strains, we tested the hypothesis that the initial host response in the lungs within hours of infection determines later outcome. The microarray experiments was performed to identify gene expression changes in the Mtb-HN878 or CDC1551- infected rabbit lungs at 3 hours post infection, compared to uninfected naïve rabbit lungs. New Zealand White rabbits were infected with Mtb HN878 or CDC1551 at ~3.5log10. At 3 hours post infection, lung tissue from Mtb-infected and uninfected rabbits were isolated and used for total RNA extraction. Total rabbit lung RNA was used for microarray analysis to determine infection induced changes in host gene expression.
Project description:We examined the microRNA profiles of THP-1 macrophages upon the MTB infection of (1) Beijing/W and non-Beijing/W clinical strains, and (2) susceptible and multidrug-resistant (MDR-) MTB strains. THP-1 cells were induced differentiation into a macrophage phenotype. Then cells were infected with three MDR (INHR, RIFR) Beijing/W, three sensitive (INHS, RIFS) Beijing/W, three MDR(INHR, RIFR) non-Beijing/W, and three sensitive (INHS, RIFS) non-Beijing/W strains. Total RNA were extracted and transfered into cDNA for miRNA profile analysis. Non-infected cells were used as control.
Project description:Chromosomal copy number variations(CNV) have been associated with various neurological and developmental disorders and chromosomal microarray (CMA) is a method of choice to diagnose Copy Number Gain/Loss syndromes. Recently, next-generation sequencing (NGS)-based low-coverage whole genome sequencing (LC-WGS) has been applied to detect Copy Number Gain/Loss syndromes. This dataset is intended to be used as a “Golden standard data set” for development of LC-WGS analysis method. It consists of patients (n=63) who have a mental delay and/or physical disability phenotype and normal (n=20) phenotype. Overall design: CNV analysis using Affymetrix 750K and HD array was performed on 63 samples with developmental delay and/or physical disability phenotype. There are also 20 samples who were not diagnostic of any CNV disease and normal phenotype.
Project description:New tuberculosis vaccines are highly desirable and urgently needed since the attenuated Mycobacterium bovis Bacillus Calmette-Guerin (BCG) provides only variable efficacy against the pulmonary form of the disease. The region of difference 1 (RD1), which is deleted in BCG and strongly impacts on Mycobacterium tuberculosis (Mtb) virulence and immunogenicity, represents a crucial locus to be engineered for either the improvement of the current BCG vaccine, or the attenuation of Mtb. Therefore, mutants secreting or not wild-type or mutated variants of the RD1-encoded 6 kDa early secreted antigenic target (ESAT-6) were generated. Comparative analysis of the transcriptome, phenotype, cytokine production profiles and the capacity to promote T cell responses were conducted in human primary dendritic cells (DCs), as they represent critical regulators of vaccine-induced immunity, unveiling a distinct immunogenic potential for BCG or Mtb mutants. In contrast to Mtb, BCG induced a poor DC maturation, and to our surprise, a BCG strain complemented with the RD1 region only partially restored DC maturation and expansion of interferon (IFN)-γ producing T cells. In contrast, infection with a recombinant attenuated Mtb strain, secreting a truncated version of ESAT-6 lacking 11 amino acids at the C-terminus portion, drove full maturation in infected DC and maintained their capacity to promote polarization of T helper (Th) 1 cells, as observed upon infection with the virulent Mtb. We performed a comparative microarray analysis of dendritic cells (DCs), infected with Mtb and BCG strains, expressing/complemented (MtbΔRD1::RD1 and BCG::RD1) or not (MtbΔRD1::B412 and BCG::B412) the/with the RD1 region. DCs were challenged with different BCG and Mtb recombinant strains for 8h.
Project description:Sigma factor E (SigE) controls the expression of genes that are essential for Mtb virulence. In this work, we have identified the SigE regulon during infection of macrophages Our results indicate that SigE regulates the expression of genes involved in the maintenance of Mtb cell envelope integrity and function (i.e., detoxification and secretion). Keywords: strains comparison We compared the global gene expression of the H37Rv strain and the sigE mutant strain of Mtb in different conditions: growing exponentially in liquid media; after 2h of incubation in RPMI; or after 24 hours of infection of human macrophage-like THP-1 cells.
Project description:The main project purpose is to investigate the fundamental physiological state of M. tuberculosis (MTB) during the infection and the mycobacterial response within the infected host tissue, human lung. High-throughput proteomic analysis of MTB cells will be involved to solve this problem. The description of pattern of proteins expressed in MTB cells extracted directly from clinical material of patients with tuberculosis defines the main novelty of the given project. Undoubtedly, the intermediate project results describing the features of MTB strains proteome in vitro will also be essential for the global scientific community.
Project description:Sigma factor E (SigE) controls the expression of genes that are essential for Mtb virulence. In this work, we have identified the SigE regulon during infection of macrophages Our results indicate that SigE regulates the expression of genes involved in the maintenance of Mtb cell envelope integrity and function (i.e., detoxification and secretion). Keywords: strains comparison Overall design: We compared the global gene expression of the H37Rv strain and the sigE mutant strain of Mtb in different conditions: growing exponentially in liquid media; after 2h of incubation in RPMI; or after 24 hours of infection of human macrophage-like THP-1 cells.
Project description:Protein acetylation is one of the post-translational modifications (PTMs) involved in regulating a myriad of cellular processes in bacteria. Increasing evidence demonstrates that lysine acetylation is involved in Mycobacterium tuberculosis (Mtb) virulence and pathogenesis. However, previous reports have detected acetylation at lysine residues using only reference strains. Here, we analyzed the global Nε- and O-acetylation of Mtb lineage 7 clinical isolates and H37Rv. Quantitative acetylome analysis resulted in identification of 2577 class-I acetylation sites derived from 987 proteins. These proteins were found to be involved in central metabolism, translation, stress responses and drug resistance. Interestingly, 261 acetylation sites on 164 proteins were differentially regulated between the two virulent strains. A total of 257 acetylation sites on 160 proteins were hypoacetylated in lineage 7. These proteins are involved in Mtb growth, virulence, energy metabolism, host-pathogen interaction and stress responses. Furthermore, Gene Ontology (GO) analysis of exclusively acetylated proteins identified revealed strain-specific enrichment of selected biological processes. Taken together, this study provides the first global analysis of O-acetylated proteins in Mtb. This quantitative acetylome data presents the abundance and diversity of acetylated proteins in Mtb and opens a new avenue of research in exploring the role of protein acetylation in fine-tuning Mtb physiology.