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Updated: Sep 6, 2025
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Growth of Mycobacterium tuberculosis Biofilms
Published on: February 15, 2012
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Origin and Global Expansion of Mycobacterium tuberculosis Complex Lineage 3
Yassir A Shuaib1,2,3,4, Christian Utpatel2,3, Thomas A Kohl2,3
1College of Veterinary Medicine, Sudan University of Science and Technology, P.O. Box 204 Hilat Kuku, Khartoum North 13321, Sudan.
Genes
|June 24, 2022
Summary
Mycobacterium tuberculosis complex (MTBC) Lineage 3 (L3) strains, prevalent in high tuberculosis burden areas, originated in Southern Asia. This study reveals their global diversity and African introduction, aiding new drug and vaccine development.
Area of Science:
- Microbiology
- Genetics
- Epidemiology
Background:
- Mycobacterium tuberculosis complex (MTBC) Lineage 3 (L3) strains are prevalent in regions with the highest tuberculosis burden.
- Understanding the population structure and global diversity of MTBC L3 is crucial for tuberculosis control.
Purpose of the Study:
- To investigate the population structure and global diversity of MTBC L3 strains.
- To identify the geographic origin and introduction events of MTBC L3 strains.
- To provide insights for clinical trials evaluating new tuberculosis drugs and vaccines.
Main Methods:
- Analysis of 2682 L3 strains from 38 countries using 24-loci mycobacterial interspersed repetitive unit-variable number of tandem repeats (MIRU-VNTR) genotyping.
- Drug susceptibility testing.
- Whole-genome sequencing (WGS) and phylogeographic analysis of 373 representative strains.
Main Results:
- Confirmed Southern Asia as the origin of MTBC L3 strains.
- Identified multiple independent introduction events into North-East and East Africa.
- Detailed the global genetic diversity and population structure of MTBC L3.
Conclusions:
- MTBC L3 strains exhibit significant global diversity with a Southern Asian origin.
- Phylogenetic variations within L3 may influence the efficacy of new tuberculosis interventions.
- This research provides a systematic understanding of L3 strains, informing future tuberculosis research and clinical trials.
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