Cited by 84Bacterial Genetics and BiotechnologyTuberculosis Research and EpidemiologyMycobacterium research and diagnosis

Identification of a Novel Conjugative Plasmid in Mycobacteria That Requires Both Type IV and Type VII Secretion

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Ummels, Roy, Abdallah, Abdallah M., Kuiper, Vincent, Aâjoud, Anouar, Sparrius, Marion, Naeem, Raeece, Spaink, Herman P., van Soolingen, Dick +2 more·2014·mBio

Abstract

Conjugative plasmids have been identified in a wide variety of different bacteria, ranging from proteobacteria to firmicutes, and conjugation is one of the most efficient routes for horizontal gene transfer. The most widespread mechanism of plasmid conjugation relies on different variants of the type IV secretion pathway. Here, we describe the identification of a novel type of conjugative plasmid that seems to be unique for mycobacteria. Interestingly, while this plasmid is efficiently exchanged between different species of slow-growing mycobacteria, including Mycobacterium tuberculosis , it could not be transferred to any of the fast-growing mycobacteria tested. Genetic analysis of the conjugative plasmid showed the presence of a locus containing homologues of three type IV secretion system components and a relaxase. In addition, a new type VII secretion locus was present. Using transposon insertion mutagenesis, we show that in fact both these secretion systems are essential for conjugation, indicating that this plasmid represents a new class of conjugative plasmids requiring two secretion machineries. This plasmid could form a useful new tool to exchange or introduce DNA in slow-growing mycobacteria. IMPORTANCE Conjugative plasmids play an important role in horizontal gene transfer between different bacteria and, as such, in their adaptation and evolution. This effect is most obvious in the spread of antibiotic resistance genes. Thus far, conjugation of natural plasmids has been described only rarely for mycobacterial species. In fact, it is generally accepted that M. tuberculosis does not show any recent sign of horizontal gene transfer. In this study, we describe the identification of a new widespread conjugative plasmid that can also be efficiently transferred to M. tuberculosis . This plasmid therefore poses both a threat and an opportunity. The threat is that, through the acquisition of antibiotic resistance markers, this plasmid could start a rapid spread of antibiotic resistance genes between pathogenic mycobacteria. The opportunity is that we could use this plasmid to generate new tools for the efficient introduction of foreign DNA in slow-growing mycobacteria.

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Authors
Ummels, R., Abdallah, A. M., Kuiper, V., Aâjoud, A., Sparrius, M., Naeem, R., Spaink, H. P., van Soolingen, D., Pain, A., & Bitter, W.
Affiliations
  • Amsterdam UMC Location Vrije Universiteit Amsterdam (NL)
  • King Abdullah University of Science and Technology (SA)
  • Leiden University (NL)
  • National Mycobacteria Reference Laboratory, National Institute for Public Health and the Environment (RIVM), Bilthoven, The Netherlands
  • Vrije Universiteit Amsterdam (NL)
Corresponding author
Bitter, Wilbert
Venue
mBio
Published
2014-10-31
Volume
5
Issue
5
Pages
e01744-14
ISSN
  • 2150-7511 (ISSN-L)
  • 2161-2129
OpenAlex
W2171116702
Cited by
84
References
33
Citations by year
2026: 6 · 2025: 3 · 2024: 2 · 2023: 5 · 2022: 3 · 2021: 7 · 2020: 10 · 2019: 13 · 2018: 7 · 2017: 8 · 2016: 14 · 2015: 6
FWCI
6.13
Type
journal article
Language
en
Open access
Locations
  • mBio (publishedVersion, cc-by-nc-sa)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by-nc-sa)
  • PubMed Central (publishedVersion, cc-by-nc-sa)
  • PubMed (publishedVersion)
  • Amsterdam UMC (VU Amsterdam) - Institutional Repository (publishedVersion)
  • VU Research Portal (publishedVersion, other-oa)
  • Leiden Repository (Leiden University) (submittedVersion, cc-by-sa)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • Pure Amsterdam UMC (submittedVersion)
  • King Abdullah University of Science and Technology Repository (King Abdullah University of Science and Technology) (submittedVersion, cc-by-nc-sa)
  • Radboud Repository (Radboud University) (submittedVersion)
  • Rivm (National Institute for Public Health and the Environment) (submittedVersion)
  • Radboud Repository (Radboud University) (submittedVersion, other-oa)
  • Data Archiving and Networked Services (DANS) (submittedVersion, other-oa)
  • Data Archiving and Networked Services (DANS) (submittedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Bacterial Genetics and Biotechnology
  • Health Sciences › Medicine › Infectious Diseases › Tuberculosis Research and Epidemiology
  • Health Sciences › Medicine › Epidemiology › Mycobacterium research and diagnosis
Keywords
conjugative plasmids, mycobacteria, Mycobacterium tuberculosis, type IV secretion system, type VII secretion system, relaxase, horizontal gene transfer, plasmid conjugation, slow-growing mycobacteria, rapidly growing mycobacteria, antibiotic resistance genes, plasmid transfer
MeSH terms
Anti-Bacterial Agents, Conjugation, Genetic, DNA, Bacterial, Molecular Sequence Data, Mycobacterium tuberculosis, Plasmids, Mutagenesis, Insertional, Genome, Bacterial, Sequence Analysis, DNA, Gene Transfer, Horizontal, Bacterial Secretion Systems

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