Plasmid and Mobile Element Analysis
One-Sentence Definition
Plasmid and mobile element analysis identifies and characterizes extrachromosomal replicons, transposons, integrons, insertion sequences, and prophages within microbial genomes.
Simple Explanation
Find the movable DNA — the parts that carry resistance between bacteria — and figure out whether they can actually travel.
Detailed Scientific Explanation
| Question | Approach / tool class |
|---|---|
| Is this contig a plasmid? | PlasmidFinder (rep types), MOB-suite, plasmid classifiers |
| Can it transfer? | tra/mob gene detection → conjugative vs mobilizable (Conjugation) |
| Which Inc group? | Replicon typing — incompatibility families |
| Any integrons/transposons? | IntegronFinder, ISfinder, MGE annotation |
| Prophage content? | PHASTER/geNomad-style predictions → Transduction link |
Short-read assemblies fragment plasmids; long reads or hybrid assembly resolve full circular replicons (Sequencing Technologies).
Mechanism
Combine replicon marker detection, assembly graph topology (circularity, coverage differences), and gene-context annotation to reconstruct mobile units.
Clinical Importance
- Distinguishes a plasmid outbreak (same gene, different species) from a clonal outbreak — different infection-control responses
Research Importance
- Plasmid epidemiology, fitness costs, co-selection of resistance cassettes
Diagnostic Relevance
- Adds context to resistance gene reports from AMR Gene Databases
AMR Relevance
Central. Most epidemic carbapenemase and ESBL genes are plasmid-borne — see Plasmid and Horizontal Gene Transfer.
Related MOCs
Active Recall Questions
- Which genes suggest a plasmid is self-transmissible?
- Why do short reads struggle with plasmids?
- Clonal outbreak vs plasmid outbreak — how would you tell?