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Replication and Active Partition of Integrative and Conjugative Elements (ICEs) of the SXT/R391 Family: The Line between ICEs and Conjugative Plasmids Is Getting Thinner


Integrative and conjugative elements (ICEs) constitute a class of mobile genetic elements defined by their ability to integrate into the chromosome of their host cell and to transfer by conjugation. Some of the most studied ICEs belong to the SXT/R391 family, which are major drivers of multidrug resistance dissemination among various pathogenic Gammaproteobacteria. Transfer of SXT/R391 ICEs to a new host first requires its excision from the chromosome as a circular molecule, which may be lost if the cell divides. In silico analyses revealed several putative stabilization systems carried by R391, a prototypical member of the SXT/R391 ICEs family originally isolated from Providencia rettgeri. We discovered that, besides stabilization by integration into the chromosome, stability of SXT/R391 ICEs also depends on toxin/antitoxin systems and plasmid-like features including intracellular replication and active partition. Thus, although it has been known for a long time that ICEs and conjugative plasmids use similar strategies to transfer between bacterial populations, our work reveals additional unforeseen similarities in their mechanisms of maintenance in the host cell.


Vyšlo v časopise: Replication and Active Partition of Integrative and Conjugative Elements (ICEs) of the SXT/R391 Family: The Line between ICEs and Conjugative Plasmids Is Getting Thinner. PLoS Genet 11(6): e32767. doi:10.1371/journal.pgen.1005298
Kategorie: Research Article
prolekare.web.journal.doi_sk: https://doi.org/10.1371/journal.pgen.1005298

Souhrn

Integrative and conjugative elements (ICEs) constitute a class of mobile genetic elements defined by their ability to integrate into the chromosome of their host cell and to transfer by conjugation. Some of the most studied ICEs belong to the SXT/R391 family, which are major drivers of multidrug resistance dissemination among various pathogenic Gammaproteobacteria. Transfer of SXT/R391 ICEs to a new host first requires its excision from the chromosome as a circular molecule, which may be lost if the cell divides. In silico analyses revealed several putative stabilization systems carried by R391, a prototypical member of the SXT/R391 ICEs family originally isolated from Providencia rettgeri. We discovered that, besides stabilization by integration into the chromosome, stability of SXT/R391 ICEs also depends on toxin/antitoxin systems and plasmid-like features including intracellular replication and active partition. Thus, although it has been known for a long time that ICEs and conjugative plasmids use similar strategies to transfer between bacterial populations, our work reveals additional unforeseen similarities in their mechanisms of maintenance in the host cell.


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Získaná hemofilie - Povědomí o nemoci a její diagnostika
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Eozinofilní granulomatóza s polyangiitidou
Autori: doc. MUDr. Martina Doubková, Ph.D.

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