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Conjugative Mating Assays for Sequence-specific Analysis of Transfer Proteins Involved in Bacterial Conjugation

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Why do mobile genetic elements transfer DNA of their hosts?

Michiel Vos¹, Angus Buckling², Bram Kuijper³

¹European Centre for Environment and Human Health, University of Exeter Medical School, Environment and Sustainability Institute, Penryn Campus, Penryn TR10 9FE, UK; Environment and Sustainability Institute, University of Exeter, Penryn TR10 9FE, UK.

Trends in Genetics : TIG

|September 20, 2024

Summary

Mobile genetic elements (MGEs) transfer host DNA, potentially boosting natural selection through increased genetic variation. This review explores MGE-host DNA transfer benefits and costs, suggesting MGE-mediated sex may benefit hosts.

Keywords:

bacterial sex conjugation horizontal gene transfer mobile genetic elements modifiers recombination transduction

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Area of Science:

Microbiology
Evolutionary Biology
Genetics

Background:

Prokaryotes utilize mobile genetic elements (MGEs) for DNA transfer within and between hosts.
MGEs can transfer not only their own genetic material but also host chromosomal DNA.

Purpose of the Study:

To review mechanisms of MGE-mediated host DNA transfer.
To explore the evolutionary benefits and costs of this process for both MGEs and hosts.
To investigate the potential role of MGE-mediated sex in host evolution.

Main Methods:

Literature review of MGEs and host DNA transfer.
Analysis of evolutionary advantages and disadvantages for MGEs and hosts.
Examination of evidence for MGE domestication and its implications.

Main Results:

MGEs facilitate the transfer of host DNA, increasing chromosomal variation.
This variation can enhance the efficiency of natural selection for the host.
MGE-mediated transfer of host DNA may not always be for a 'sex' function but can lead to host benefits.

Conclusions:

MGEs play a significant role in prokaryotic genetic exchange and evolution.
MGE-mediated host DNA transfer can provide indirect benefits to hosts via enhanced selection.
Evidence suggests MGE domestication may represent a form of MGE-mediated sex with host advantages.