ArticleCommunications biology2026
Dual regulatory role of IS91-encoded Orf121 in IS91 transposition.
Article in Communications biology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 2 papers.
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Who cites it
2 citing papers in PubMed.
- Genomic architecture of antimicrobial resistance and mobile genetic elements inMicrobiology spectrum · 2026Article
- High-Risk ExPEC from Commensal Phylogroup A: Genomic Characterization of a Bovine Meningoencephalitis Isolate, BN01.Microorganisms · 2026Article
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Authors and funding
6 authors.
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Abstract
Insertion sequences (IS) are key players in bacterial genome plasticity and horizontal gene transfer. IS91 family members, belonging to the HUH superfamily of single-strand nucleases, are often linked with antibiotic resistance genes. Among these, the element IS91 is unique as it also carries a sequence called orf121, whose stop codon overlaps with the start codon of tnpA, a highly conserved feature of IS91 isoforms. We show that Orf121 serves as a dual regulator of IS91 transposition: Orf121 inhibits transposition activity of TnpA while facilitating accurate excision of IS91 single-strand circular intermediates. This accurate excision reduces one-ended transposition events, i.e., events arising when proper termination fails, leading to the co-mobilization of adjacent DNA. We also provide evidence that the bottom-stranded ssDNA circular intermediate is the functional substrate IS91. These findings highlight a sophisticated regulatory strategy balancing IS91 mobility and genetic stability.
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