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Clinical Microbiology Reviews, 10 1995, 496-514, Vol 8, No. 4
Copyright © 1995 by the American Society for Microbiology. All rights reserved.
Antimicrobial agent resistance in mycobacteria: molecular genetic insights
JM Musser
Department of Pathology, Baylor College of Medicine, Houston, TX 77030, USA.
The primary theme emerging from molecular genetic work conducted with
Mycobacterium tuberculosis and several other mycobacterial species is that
resistance is commonly associated with simple nucleotide alterations in
target chromosomal genes rather than with acquisition of new genetic
elements encoding antibiotic-altering enzymes. Mutations in an 81-bp region
of the gene (rpoB) encoding the beta subunit of RNA polymerase account for
rifampin resistance in 96% of M. tuberculosis and many Mycobacterium leprae
isolates. Streptomycin resistance in about one-half of M. tuberculosis
isolates is associated with missense mutations in the rpsL gene coding for
ribosomal protein S12 or nucleotide substitutions in the 16S rRNA gene
(rrs). Mutations in the katG gene resulting in catalase-peroxidase amino
acid alterations nad nucleotide substitutions in the presumed regulatory
region of the inhA locus are repeatedly associated with isoniazid-resistant
M. tuberculosis isolates. A majority of fluoroquinolone-resistant M.
tuberculosis isolates have amino acid substitutions in a region of the DNA
gyrase A subunit homologous to a conserved fluoroquinolone
resistance-determining region. Multidrug-resistant isolates of M.
tuberculosis arise as a consequence of sequential accumulation of mutations
conferring resistance to single therapeutic agents. Molecular strategies
show considerable promise for rapid detection of mutations associated with
antimicrobial resistance. These approaches are now amenable to utilization
in an appropriately equipped clinical microbiology laboratory.
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