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© Clifton E. Barry III, Ph.D., NIAID, NIH.
Colorized scanning electron micrograph of Mycobacterium tuberculosis
Publication : Trends in microbiology

The evolution of mycobacterial pathogenicity: clues from comparative genomics

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Trends in microbiology - 01 Sep 2001

Brosch R, Pym AS, Gordon SV, Cole ST

Link to Pubmed [PMID] – 11553458

Trends Microbiol. 2001 Sep;9(9):452-8

Comparative genomics, and related technologies, are helping to unravel the molecular basis of the pathogenesis, host range, evolution and phenotypic differences of the slow-growing mycobacteria. In the highly conserved Mycobacterium tuberculosis complex, where single-nucleotide polymorphisms are rare, insertion and deletion events (InDels) are the principal source of genome plasticity. InDels result from recombinational or insertion sequence (IS)-mediated events, expansion of repetitive DNA sequences, or replication errors based on repetitive motifs that remove blocks of genes or contract coding sequences. Comparative genomic analyses also suggest that loss of genes is part of the ongoing evolution of the slow-growing mycobacterial pathogens and might also explain how the vaccine strain BCG became attenuated.