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Mycobacterium canariasense sp. nov.

M Soledad Jiménez1, M Isolina Campos-Herrero2, Diana García2

  • 1Laboratorio de Micobacterias, Servicio de Bacteriología, Centro Nacional de Microbiología, Instituto de Salud Carlos III, Majadahonda, Madrid, Spain.

International Journal of Systematic and Evolutionary Microbiology
|September 25, 2004
PubMed
Summary

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A new species of rapidly growing mycobacteria, Mycobacterium canariasense, was identified in patients with febrile syndrome. This novel opportunistic pathogen is genetically distinct from other known mycobacteria.

Area of Science:

  • Microbiology
  • Bacteriology
  • Infectious Diseases

Background:

  • Mycobacterial infections can cause febrile syndrome.
  • Rapidly growing, non-pigmented mycobacteria represent a diagnostic challenge.
  • Identification of novel mycobacterial species is crucial for understanding pathogenesis and treatment.

Purpose of the Study:

  • To characterize a novel, rapidly growing, non-pigmented mycobacterium isolated from patients.
  • To determine the phylogenetic and genetic relatedness of these isolates to known mycobacteria.
  • To propose a new species name for this opportunistic pathogen.

Main Methods:

  • Isolation of bacteria from patient blood samples.
  • Cultivation on Löwenstein-Jensen medium and MacConkey agar without crystal violet.

Related Experiment Videos

  • Analysis of cell wall mycolates.
  • Gene sequencing of hsp65 and 16S rRNA.
  • DNA-DNA hybridization.

    • Main Results:

    • A novel, rapidly growing, non-pigmented mycobacterium was isolated from 17 patients with febrile syndrome.
    • The isolates exhibited unique sequences in hsp65 and 16S rRNA genes, distinguishing them from other mycobacteria.
    • DNA-DNA hybridization showed <15% reassociation with 13 other recognized rapidly growing mycobacteria.
    • The isolates contained alpha- and alpha'-mycolates in their cell wall.

    Conclusions:

    • The novel isolates represent a new species, proposed as Mycobacterium canariasense sp. nov.
    • Mycobacterium canariasense is an opportunistic pathogen closely related to Mycobacterium diernhoferi.
    • This finding expands the spectrum of mycobacteria associated with febrile illness.