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Mobilizable bacterial DNA packaged into membrane vesicles induces serial transduction.

Branko Velimirov¹, Sylvia Hagemann

¹Centre of Anatomy and Cell Biology; A.G. Microbiology, Molecular Biology and Virology; Medical University of Vienna; Vienna, Austria.

Mobile Genetic Elements

|October 22, 2011

Summary

Marine particles facilitate horizontal gene transfer in E. coli, enabling genetic repair through a novel mechanism resembling generalized transduction. This discovery reveals a new pathway for microbial genetic exchange in oligotrophic environments.

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Area of Science:

Microbiology
Marine Biology
Genetics

Background:

Horizontal gene transfer (HGT) is crucial for microbial evolution.
Marine environments harbor diverse particles with unknown biological functions.
Oligotrophic environments present unique challenges for microbial life.

Purpose of the Study:

To investigate the role of marine particles in horizontal gene transfer.
To identify the mechanism of genetic material transfer mediated by these particles.
To characterize the nature and genetic capacity of the observed particles.

Main Methods:

Exposure of an amino acid-deficient E. coli strain (AB1157) to marine particle fractions (100-130 nm).
Analysis of revertant E. coli for restored genetic deficiencies and marker transfer frequencies.
Ultra-structural investigation and Field Gel Electrophoresis to characterize particle properties and DNA content.

Main Results:

Evidence of HGT leading to genetic deficiency restoration in E. coli at frequencies up to 1.94 × 10(-5).
Non-preferential marker transfer suggests generalized transduction as the mechanism.
Revertant strains produced infectious particles, with some containing significantly large DNA payloads (370 kbp).

Conclusions:

Marine particles can mediate a novel form of HGT in bacteria.
The mechanism appears to be generalized transduction, distinct from previously known pathways.
These findings suggest a new avenue for microbial genetic exchange in marine ecosystems.