Molecular Epidemiology of Mycobacterium Tuberculosis and Drug Resistance

Molecular epidemiology of Mycobacterium tuberculosis combines genomic sequencing, phylogenetic analysis and high‐resolution typing methods to trace transmission chains, identify emerging lineages and characterise mechanisms of drug resistance. Advances in whole-genome sequencing (WGS) and genotyping tools such as spoligotyping and MIRU-VNTR have enabled researchers to resolve strain diversity at a global scale, linking specific mutations to resistance phenotypes for key drugs like isoniazid and rifampicin. Population‐level mapping of single nucleotide polymorphisms (SNPs) and large sequence polymorphisms has revealed both ancient and modern lineages with distinct geographic distributions, while comparative genomics continues to uncover epistatic networks of resistance, compensatory mutations and lineage-associated fitness advantages. Integrating pathogen genomics with patient demographics and spatial data has informed targeted public-health interventions, guiding contact tracing, outbreak response and tailored treatment regimens in diverse settings from sub-Saharan Africa to South America and Asia.

Research from Nature Portfolio

Recent studies have delineated the spatial structure and hotspot dynamics of tuberculosis lineages in high-burden regions. A comprehensive analysis of archived isolates from a national drug-resistance survey delineated four major lineages in Ethiopia, with lineage 3 and lineage 4 driving both total and multidrug-resistant tuberculosis (MDR-TB) burdens. Spatial statistics identified regional hotspots for specific spoligotypes and MDR/rifampicin-resistant cases, revealing significant variation in lineage prevalence across federal regions. These findings underscore the need for regionally tailored surveillance and intervention strategies, linking genotypic data directly to public-health mapping and resource allocation.

Molecular Epidemiology of Mycobacterium Tuberculosis and Drug Resistance publication trend

The graph below shows the total number of articles in molecular epidemiology of mycobacterium tuberculosis and drug resistance across all publications each year (not limited to Nature Index journals).

Technical terms

Spoligotyping: A PCR-based method that detects unique spacer sequences in the CRISPR locus to assign isolates to defined strain families.

MIRU-VNTR: Mycobacterial interspersed repetitive unit–variable number tandem repeat typing uses multiple loci of tandem repeats for high-resolution strain discrimination.

Whole-genome sequencing (WGS): High-throughput sequencing of the entire M. tuberculosis genome to identify SNPs, insertions/deletions and resistance-conferring mutations.

Lineage: A phylogenetic grouping of M. tuberculosis strains sharing a common ancestor and often exhibiting geographical or epidemiological associations.

Drug-resistant tuberculosis (DR-TB): Tuberculosis caused by strains with genetic mutations that confer resistance to one or more first-line drugs, including multidrug-resistant (MDR) and extensively drug-resistant (XDR) forms.

References

1. Population structure and spatial distribution of Mycobacterium tuberculosis in Ethiopia. Scientific Reports (2024).
2. Determining the risk-factors for molecular clustering of drug-resistant tuberculosis in South Africa. BMC Public Health (2023).
3. Comparative whole-genome sequence analysis of Mycobacterium tuberculosis isolated from pulmonary tuberculosis and tuberculous lymphadenitis patients in Northwest Ethiopia. Frontiers in Microbiology (2023).
4. Lack of methoxy-mycolates characterizes the geographically restricted lineage 7 of Mycobacterium tuberculosis complex. Microbial Genomics (2023).