Evolutionary Relationships among Strains of Mycobacterium tuberculosis with Few Copies of IS 6110

Author:

Dale Jeremy W.1,Al-Ghusein Hasan2,Al-Hashmi Salim1,Butcher Philip2,Dickens Anne L.3,Drobniewski Francis4,Forbes Ken J.5,Gillespie Stephen H.3,Lamprecht Dianie4,McHugh Timothy D.3,Pitman Richard6,Rastogi Nalin7,Smith Andrew T.1,Sola Christophe7,Yesilkaya Hasan5

Affiliation:

1. School of Biomedical and Life Sciences, University of Surrey, Guildford, Surrey GU2 7XH

2. Department of Medical Microbiology, St. George's Hospital Medical School, London SW17 0RE

3. Department of Medical Microbiology, Royal Free and University College Medical School, London NW3 2PF

4. PHLS Mycobacterial Reference Unit, Public Health and Medical Microbiology, Guy's, Kings and St. Thomas' School of Medicine, London SE22 8QF

5. Department of Medical Microbiology, Aberdeen University, Foresterhill, Aberdeen AB25 2ZD

6. Respiratory Division, PHLS Communicable Disease Surveillance Centre, London NW9 5EQ, United Kingdom

7. Unité de la Tuberculose et des Mycobactéries, Institut Pasteur, F-97165 Pointe-à-Pitre Cedex, Guadeloupe, France

Abstract

ABSTRACT Molecular typing of Mycobacterium tuberculosis by using IS 6110 shows low discrimination when there are fewer than five copies of the insertion sequence. Using a collection of such isolates from a study of the epidemiology of tuberculosis in London, we have shown a substantial degree of congruence between IS 6110 patterns and both spoligotype and PGRS type. This indicates that the IS 6110 types mainly represent distinct families of strains rather than arising through the convergent insertion of IS 6110 into favored positions. This is supported by identification of the genomic sites of the insertion of IS 6110 in these strains. The combined data enable identification of the putative evolutionary relationships of these strains, comprising three lineages broadly associated with patients born in South Asia (India and Pakistan), Africa, and Europe, respectively. These lineages appear to be quite distinct from M. tuberculosis isolates with multiple copies of IS 6110 .

Publisher

American Society for Microbiology

Subject

Molecular Biology,Microbiology

Reference47 articles.

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3. Epidemiologic Usefulness of Spoligotyping for Secondary Typing of Mycobacterium tuberculosis Isolates with Low Copy Numbers of IS 6110

4. Dale, J. W., D. Brittain, A. A. Cataldi, D. Cousins, J. T. Crawford, J. Driscoll, H. Heersma, T. Lillebaek, T. Quitugua, N. Rastogi, R. A. Skuce, C. Sola, D. Van Soolingen, and V. Vincent. 2001. Spacer oligonucleotide typing of bacteria of the Mycobacterium tuberculosis complex: recommendations for standardised nomenclature. Int. J. Tuberc. Lung Dis.5:216-219.

5. Dale, J. W., T. H. Tang, S. Wall, Z. F. Zainuddin, and B. Plikaytis. 1998. Conservation of IS6110 sequence in strains of Mycobacterium tuberculosis with single and multiple copies. Tuberc. Lung Dis.78:225-227.

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