Characterization of M tuberculosis: Implications of Diversity and Versatility on Pathogenesis, Treatment and Drug Development

Mycobacterium tuberculosis, the causative agent of tuberculosis, continues to pose a significant global health burden despite advances in diagnosis and treatment. This review examines the taxonomic classification, evolutionary history, and genetic diversity within the Mycobacterium tuberculosis complex (MTBC). Special attention is devoted to the distinctive architecture of the cell envelope, consisting of peptidoglycan, arabinogalactan, mycolic acids, and various free lipids, which contribute to the pathogen's pathogenesis, virulence, intracellular survival, persistence, and resistance to antibiotics. Furthermore, it discusses emerging insights into the metabolic pathways that support Mtb’s adaptation to hostile host environments and highlights current and potential therapeutic strategies targeting the cell envelope. This review elucidates the interplay between MTB genes and biochemistry, emphasizes the need for integrated strategies in TB drug development, and advocates for continued research into targeting the cell envelope to overcome drug-sensitive and drug-resistant tuberculosis.