Environmental Mycobacterium avium subsp. hominissuis have a higher probability to act as a recipient in conjugation than clinical strains

Salma A. Shoulah, Anna M. Oschmann, Abdelfattah Selim, Torsten Semmler, Carsten Schwarz, Elisabeth Kamal, Faysal Hamouda, Elsayed Galila, Wilbert Bitter, Astrid Lewin

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4 Citations (Scopus)


Mycobacterium avium subsp. hominissuis (MAH) is a widespread opportunistic pathogen that can be isolated from environment (dust, soil and water) and patients with lung or lymphnode infection. In our previous research we revealed the pronounced genetic diversity in MAH by identifying eight different types of a newly described genomic island. In order to identify mechanisms of such horizontal gene transfer we now analyzed the ability of 47 MAH isolates to inherit the conjugative plasmid pRAW from M. marinum. A higher percentage of environmental isolates (22.7%) compared to clinical isolates (8%) had the capacity to function as recipient in conjugal plasmid transfer. Genetic analysis showed additionally that environmental isolates contained more genes homologous to genes present on conjugative mycobacterial plasmids than clinical isolates. Comparative analysis of the genomes of the isolates pointed to a possible association between the ability to act as recipient in conjugation and the structure of a genomic region containing the radC gene and a type I restriction/modification system. Finally we found that uptake of pRAW decreased the resistance against various antibiotics.
Original languageEnglish
Pages (from-to)28-35
Number of pages8
Early online date16 Jan 2018
Publication statusPublished - Jan 2018


  • Antibiotic resistance
  • Conjugation
  • Mycobacterium avium
  • Plasmid
  • Type I restriction modification

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