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Chimeric infective particles expand species boundaries in phage inducible chromosomal island mobilization

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Paper Summary

Paperzilla title
Pirate PICIs Steal Phage Tails to Invade New Bacterial Species

This study reveals that capsid-forming phage-inducible chromosomal islands (cf-PICIs) can release tail-less capsids containing their DNA, which then "steal" tails from different phage species. This tail piracy creates chimeric particles capable of injecting cf-PICI DNA into new bacterial species, significantly broadening cf-PICIs host range and transfer frequency.

Explain Like I'm Five

Imagine tiny DNA pirates that build their own ships (capsids) but need to steal motors (phage tails) to invade other bacteria. These stolen motors let them infect different kinds of bacteria, spreading their DNA far and wide.

Possible Conflicts of Interest

None identified

Identified Limitations

Limited Bacterial Diversity
While cf-PICIs are widespread, this study primarily focused on Proteobacteria, mainly E. coli and K. pneumoniae. Further research is needed to confirm if tail piracy is prevalent in other bacterial phyla and if there are differences in the mechanism.
Unknown Portal Specificity
The study doesn't explain how cf-PICI particles specifically interact with their own portal protein for DNA packaging and not with the phage-encoded ones, which might reveal further intricacies of their unique mechanism.
Limited exploration of tail piracy variation
While the study briefly touches upon the promiscuity of some cf-PICIs in hijacking various phage tails, the underlying molecular reasons for this variability in interaction are not fully explored.

Rating Explanation

This study reveals a novel and fascinating mechanism of horizontal gene transfer with significant implications for bacterial evolution and pathogenicity. The combination of detailed molecular work, structural analysis (cryo-EM), and in vivo experiments makes it compelling, despite the limitations regarding broader bacterial diversity and mechanistic details which warrant further investigations.

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Topic Hierarchy

Domain: Life Sciences
Subfield: Virology

File Information

Original Title: Chimeric infective particles expand species boundaries in phage inducible chromosomal island mobilization
Uploaded: September 10, 2025 at 10:30 AM
Privacy: Public