Sideways, not parent-child
A gene's history can disagree with the cell lineage that currently hosts it.
Identity is genealogical: a tree of cells can be a web of genes. 16S might say one species while a plasmid says another neighborhood.
HGT is ordinary in bacteria and archaea. It is the reason 'superbug' headlines often name a gene, not only a species.
Traits
Three named vehicles
Free DNA, cell-to-cell contact, and phage passengers cover the textbook map.
Plasmids
Optional DNA can file resistance, metals or extra food pathways.
Integrons
Cassette systems stack genes so a cell can collect a toolkit.
Ecological speed
One successful cassette can appear in many species after travel through guts and wards.
No protocol
Competence recipes, mating mixes and phage prep are omitted on purpose.
This page will not teach how to move genes in a laboratory.
Keep exploring
More in Change & defence
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Populations of genomes, not cartoon villains — RNA viruses copy sloppily, and public-health names track clusters that spread.
Familiarity 92Antibiotic resistance
A shared drug budget under selection in hospitals, farms and wastewater — stewardship, not a lab manual.
Familiarity 85Vaccines and immunity
Antibodies, memory cells and community arithmetic — conceptual, not a prescription and not an anti-vaccine tract.
Familiarity 94Biofilms
Surface cities of microbes — plaque and catheters explain persistence, without a grow-your-own kit.
Familiarity 38Hygiene and balance
Clean water saves lives; missing old microbial partners is a separate, still-debated immune story.
Familiarity 70