What does this research mean for the field?

Outer membrane vesicle (OMV)-mediated transfer of bla OXA-24-like plasmids in Acinetobacter baumannii is constrained by strict, host-specific, post-packaging barriers rather than DNA packaging efficiency, limiting cross-species dissemination. Novelty: ClaimNovelty.NOVEL_FINDING. Consensus alignment: ConsensusAlignment.CHALLENGES_CONSENSUS.

What question did this study set out to answer?

To identify the mechanisms and host-specific biological barriers that control outer membrane vesicle-mediated transfer of blaOXA-24-like carbapenem resistance plasmids across Acinetobacter species.

August 22, 2026mSphereOpen Access

Strain-specific outer membrane vesicle-mediated transfer of a bla OXA-24 -like plasmid in Acinetobacter baumannii restricts cross-species dissemination

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Authors

SJShengnan Jiang BYBiyong Yan HLHaiyang Liu

Discussion

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Overview

Experimental study demonstrates strain-specific vesicle-mediated plasmid transfer in Acinetobacter baumannii, indicating host-restricted barriers prevent cross-species carbapenem resistance.

Key Points

To identify the mechanisms and host-specific biological barriers that control outer membrane vesicle-mediated transfer of blaOXA-24-like carbapenem resistance plasmids across Acinetobacter species.
Screened a nationwide collection of 2,880 clinical Acinetobacter isolates in China to detect blaOXA-24 and blaOXA-72 plasmids across Acinetobacter baumannii, Acinetobacter pittii, and Acinetobacter baylyi.
Quantified outer membrane vesicle (OMV) production, plasmid DNA packaging capacity (ranging ~4.5–28.6 ng/μg), and plasmid transfer frequencies into A. baumannii ATCC 17978 and 13 non-A. baumannii recipient strains.
Clinical strain A2485 produced 2.74 ± 0.20-fold more OMVs than ATCC 17978 (P < 0.001) and transferred the blaOXA-72 plasmid at 1.9 × 10⁻⁷ transformants per CFU compared to 3.2 × 10⁻⁸ for culture supernatant.
OMV-mediated transfer was strictly donor-dependent and restricted to A. baumannii, showing zero transmission to 13 non-A. baumannii strains and no subsequent retransmission by transformed recipients.
Recipient strains loaded with equal or higher plasmid DNA in vesicles (23.98–28.62 ng/μg vs 13.62 ng/μg in donor A2485) failed to transfer the plasmid, confirming post-packaging host restriction.

Cite This Study

Jiang et al. (2026) studied this question.

synapsesocial.com/papers/6a895ffeca7ade938187f07d https://doi.org/10.1128/msphere.00311-26

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August 22, 2026mSphereOpen Access

Strain-specific outer membrane vesicle-mediated transfer of a bla OXA-24 -like plasmid in Acinetobacter baumannii restricts cross-species dissemination

View Full Paper

Ask AI

Bookmark

Authors

SJShengnan Jiang BYBiyong Yan HLHaiyang Liu

Discussion

Member takes

Overview

Experimental study demonstrates strain-specific vesicle-mediated plasmid transfer in Acinetobacter baumannii, indicating host-restricted barriers prevent cross-species carbapenem resistance.

Key Points

To identify the mechanisms and host-specific biological barriers that control outer membrane vesicle-mediated transfer of blaOXA-24-like carbapenem resistance plasmids across Acinetobacter species.
Screened a nationwide collection of 2,880 clinical Acinetobacter isolates in China to detect blaOXA-24 and blaOXA-72 plasmids across Acinetobacter baumannii, Acinetobacter pittii, and Acinetobacter baylyi.
Quantified outer membrane vesicle (OMV) production, plasmid DNA packaging capacity (ranging ~4.5–28.6 ng/μg), and plasmid transfer frequencies into A. baumannii ATCC 17978 and 13 non-A. baumannii recipient strains.
Clinical strain A2485 produced 2.74 ± 0.20-fold more OMVs than ATCC 17978 (P < 0.001) and transferred the blaOXA-72 plasmid at 1.9 × 10⁻⁷ transformants per CFU compared to 3.2 × 10⁻⁸ for culture supernatant.
OMV-mediated transfer was strictly donor-dependent and restricted to A. baumannii, showing zero transmission to 13 non-A. baumannii strains and no subsequent retransmission by transformed recipients.
Recipient strains loaded with equal or higher plasmid DNA in vesicles (23.98–28.62 ng/μg vs 13.62 ng/μg in donor A2485) failed to transfer the plasmid, confirming post-packaging host restriction.

Cite This Study

Jiang et al. (2026) studied this question.

synapsesocial.com/papers/6a895ffeca7ade938187f07d https://doi.org/10.1128/msphere.00311-26

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