horizontal gene transfer

Compiled with AI assistance and selectively reviewed. Please consult the cited passages; the books remain the authoritative source. About this companion

Editorial synthesis · provisional

Definition

Horizontal gene transfer is lateral movement of genetic material across lineages rather than solely from parent to offspring. RB1 emphasizes microbial transfer through plasmids, viruses and endosymbiotic events, with antibiotic resistance and major integrations as examples. The mechanism expands possible sources of genomic variation and yields network-like histories for many genes, while remaining compatible with common ancestry and ordinary evolutionary processes.

Explanation

The direct account distinguishes lateral gain and loss from point mutation and vertical transmission. Its scope is especially microorganisms, where such changes can rival mutation as a source of genomic difference in many lineages. The entry does not turn that comparison into an assertion that every genome or organism is dominated by transfer.

Native references connect the discussion to Koonin, plastid origins and resistance-gene spread. These are reported biological examples, not independently reconstructed events in this assessment. RB2’s endosymbiotic integration discussion supplies the broader organizational point that separate lineages can become a higher-order unit with altered conditions of persistence.

RB1 explicitly retains universal common ancestry while recognizing reticulation in microbial gene histories. RB3 compares language borrowing to gene flow or lateral transfer, but that remains cross-domain analogy. It does not make cultural transmission a literal genomic mechanism or mean that a simple family tree captures every kind of inheritance.

Scope and attribution

Keep the microbial emphasis, specific transfer routes and limits on cross-domain analogy.

RB1 — The Real Book, Volume I: The Possible Is Real

Lateral genomic movement and reticulate gene histories refine rather than replace descent.

Occurrence locators: 152, 153.

RB3 — The Real Book, Volume III: Murmurations

Language borrowing is an analogy, not literal genetic transfer.

Occurrence locators: 83.

Background used in the editorial explanation

Named theories and mechanisms are distinguished from neighboring background, homonyms and the author’s own synthesis. Reproduced AI passages retain their separate voice.