ArticlePLoS genetics2024
Transcription termination and antitermination are critical for the fitness and function of the integrative and conjugative element Tn916.
Article in PLoS genetics, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
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Who cites it
4 citing papers in PubMed.
- Ulva fasciata litter decomposition fuels microbial restructuring and antibiotic resistance proliferation in mariculture sediment.Antonie van Leeuwenhoek · 2026Article
- State-dependent promoter switching mediates integrase gene transcription in the integrative and conjugative element ICEKp1 of Klebsiella pneumoniae.Nucleic acids research · 2026Article
- Cross-sectional comparative shotgun metagenomic analysis of the subgingival resistome in healthy subjects and patients with periodontitis from four countries.Journal of oral microbiology · 2026Article
- Identification of insertion sites for the integrative and conjugative element Tn916 in the Bacillus subtilis chromosome.PloS one · 2025Article
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Authors and funding
2 authors.
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Abstract
Premature expression of genes in mobile genetic elements can be detrimental to their bacterial hosts. Tn916, the founding member of a large family of integrative and conjugative elements (ICEs; aka conjugative transposons), confers tetracycline-resistance and is found in several Gram-positive bacterial species. We identified a transcription terminator near one end of Tn916 that functions as an insulator that prevents expression of element genes when Tn916 is integrated downstream from an active host promoter. The terminator blocked expression of Tn916 genes needed for unwinding and rolling circle replication of the element DNA, and loss of the terminator caused a fitness defect for the host cells. Further, we identified an element-encoded antiterminator (named canT for conjugation-associated antitermination) that is essential for transcription of Tn916 genes after excision of the element from the host chromosome. We found that the antiterminator is orientation-specific, functions with heterologous promoters and terminators, is processive and is most likely a cis-acting RNA. Insulating gene expression in conjugative elements that are integrated in the chromosome is likely a key feature of the interplay between mobile genetic elements and their hosts and appears to be critical for the function and evolution of the large family of Tn916-like elements.
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