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Horizontal Gene Transfer

Horizontal Gene Transfer

Horizontal gene transfer (HGT) is a process where genetic material moves between organisms within the same generation, unlike vertical gene transfer, which occurs from parent to offspring. HGT plays a crucial role in microbial evolution, adaptation, and survival, particularly in shared environments like the human gut.Mobile genetic elements such as plasmids, prophages, integrons, insertion sequences, and transposons facilitate this process. HGT occurs through three primary mechanisms:...

Types of Genetic Transfer Between Organisms

Types of Genetic Transfer Between Organisms

Genetic transfer occurs when genetic information is passed from one organism to another. It occurs via two mechanisms: vertical gene transfer and horizontal gene transfer. Vertical gene transfer occurs when genetic information is transferred from one generation to the next, which happens much more frequently than horizontal gene transfer. Both sexual and asexual reproduction are forms of vertical gene transfer, where one or more organisms pass some or all of their genome onto their progeny.

Transduction

Transduction

Among the three main modes of HGT—transformation, conjugation, and transduction—transduction is unique in that it is mediated by bacteriophages, or bacterial viruses.Transduction occurs in two ways. Generalized transduction occurs during the lytic cycle of a bacteriophage infection. In this process, bacteriophages infect bacterial cells, replicate within them, and ultimately cause cell lysis, releasing newly assembled virions. Occasionally, random fragments of the bacterial genome...

Transposons

Transposons

Transposons, or "jumping genes," are small mobile genetic elements (MGEs) that range from 700 to 40,000 base pairs in length. They are found in all organisms and can move within the same chromosome or transfer to different chromosomes. In some cases, transposons can also jump between different host DNA molecules, such as plasmids or viruses, contributing to genetic variability.Barbara McClintock first discovered these mobile genetic elements in the 1940s while studying maize genetics, and she...

Conjugation

Conjugation

Conjugation is a form of horizontal gene transfer that primarily occurs in bacteria and some archaea, promoting genetic diversity and adaptation. Bacteria can acquire resistance genes through conjugative plasmids, allowing them to survive antibiotic treatments that would otherwise be lethal. This process involves direct contact between cells through specialized structures such as the sex pilus and is mediated by conjugative plasmids, including the F (fertility) factor.Conjugation requires...

Genome Size and the Evolution of New Genes

Genome Size and the Evolution of New Genes

While every living organism has a genome of some kind (be it RNA, or DNA), there is considerable variation in the sizes of these blueprints. One major factor that impacts genome size is whether the organism is prokaryotic or eukaryotic. In prokaryotes, the genome contains little to no non-coding sequence, such that genes are tightly clustered in groups or operons sequentially along the chromosome. Conversely, the genes in eukaryotes are punctuated by long stretches of non-coding sequence.

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Related Experiment Video

Updated: Aug 8, 2025

Detection of Horizontal Gene Transfer Mediated by Natural Conjugative Plasmids in E. coli

Detection of Horizontal Gene Transfer Mediated by Natural Conjugative Plasmids in E. coli

Published on: March 24, 2023

How do interactions between mobile genetic elements affect horizontal gene transfer?

Tanya Horne¹, Victoria T Orr¹, James Pj Hall¹

¹Department of Evolution, Ecology and Behaviour, Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool, Crown Street, Liverpool L69 7ZB, United Kingdom.

Current Opinion in Microbiology

|March 2, 2023

Summary

Mobile genetic elements (MGEs) drive bacterial adaptation through horizontal gene transfer. Their interactions, including collaborations and conflicts, significantly influence trait flow and evolution within microbiomes.

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Last Updated: Aug 8, 2025

Detection of Horizontal Gene Transfer Mediated by Natural Conjugative Plasmids in E. coli

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Methodology for the Study of Horizontal Gene Transfer in Staphylococcus aureus

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High-Resolution Comparison of Bacterial Conjugation Frequencies

High-Resolution Comparison of Bacterial Conjugation Frequencies

Published on: January 10, 2019

Area of Science:

Microbiology
Evolutionary Biology
Genetics

Background:

Horizontal gene transfer (HGT) is a key mechanism for bacterial adaptation.
Mobile genetic elements (MGEs) are the primary drivers of HGT.
Interactions between MGEs are increasingly recognized as crucial for trait dissemination.

Purpose of the Study:

To review recent studies on MGE-MGE interactions.
To highlight the role of genome defense systems in mediating these interactions.
To outline the evolutionary consequences of MGE interplay.

Main Methods:

Literature review of recent studies on MGEs and HGT.
Analysis of MGE-MGE collaborations and conflicts.
Examination of genome defense mechanisms.

Main Results:

MGE-MGE interactions profoundly affect the acquisition and maintenance of genetic material.
Collaborations and conflicts between MGEs can promote or inhibit HGT.
Genome defense systems play a critical role in regulating MGE-MGE conflicts.

Conclusions:

Understanding MGE-MGE interplay is essential for comprehending bacterial evolution.
These interactions shape the flow of adaptive traits at molecular, microbiome, and ecosystem levels.
Further research into MGE dynamics is crucial for evolutionary and microbiome science.