Mycobacterium tuberculosis Transcriptome Profiling in Mice with Genetically Different Susceptibility to Tuberculosis

Area of Science:

• Microbiology
• Genomics
• Pathogen Biology

Background:

• Whole transcriptome profiling is crucial for understanding microbial behavior in vivo.
• Mycobacterium tuberculosis (M. tuberculosis) is a major human bacterial pathogen causing tuberculosis.
• In vivo transcriptome studies are essential for hypothesis generation and validation in infectious diseases.

Purpose of the Study:

• To investigate genome-wide transcriptional changes of M. tuberculosis during persistent infection in mouse lungs.
• To identify commonly upregulated genes (CUG) associated with disease progression in different host susceptibilities.
• To explore potential roles of these genes in M. tuberculosis adaptation and identify new drug targets.

Main Methods:

• Experimental infection of two mouse strains with M. tuberculosis.
• Whole transcriptome profiling of M. tuberculosis from infected lung tissues at two time points.
• Deep sequencing and comparative analysis of mycobacterial transcriptomes.

Main Results:

• Identified 209 commonly upregulated genes (CUG) in M. tuberculosis during disease progression across both mouse strains.
• Highlighted genes involved in lipid metabolism, cell wall, and cell processes as particularly interesting.
• Observed potential shifts towards lipid and amino acid metabolism, anaerobic respiration, and immune modulation.

Conclusions:

• The identified CUGs are likely involved in M. tuberculosis adaptation to host immune defenses.
• Genes related to lipid metabolism and cell wall are promising candidates for novel tuberculosis drug development.
• Transcriptome profiling provides valuable insights into pathogen survival mechanisms during chronic infection.