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Related Experiment Videos

Bacterial DNA methylation and gene transfer efficiency.

S Allamane1, P Jourdes, D Ratel

  • 1INSERM U318, CHU Michallon, Grenoble Cedex 09, 38043, France.

Biochemical and Biophysical Research Communications
|October 12, 2000
PubMed
Summary

Bacterial methylation of plasmid DNA (Dam and Dcm systems) does not reduce gene transfer efficiency. Plasmids amplified in standard bacteria (dam(+), dcm(+)) show higher luciferase expression than those from methylation-deficient bacteria (dam(-), dcm(-)).

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biotechnology

Background:

  • Plasmid amplification in bacteria for DNA immunization and gene therapy introduces sequence modifications via Dam and Dcm methylation systems.
  • These modifications result in 6-methyladenine (m6A) in GATC sites and 5-methylcytosine (m5C) in CC(A/T)GG sites.
  • The impact of these bacterial methylation patterns on eukaryotic gene transfer efficiency is largely unknown.

Purpose of the Study:

  • To compare the in vitro and in vivo gene transfer efficiency of a pCMV-luc reporter plasmid amplified in both standard (dam(+), dcm(+)) and methylation-deficient (dam(-), dcm(-)) bacterial strains.
  • To investigate whether bacterial methylation patterns affect gene expression levels post-transfection.

Main Methods:

  • Amplification of a pCMV-luc reporter plasmid in two bacterial strains: JM109 (dam(+), dcm(+)) and JM110 (dam(-), dcm(-)).

Related Experiment Videos

  • In vitro and in vivo gene transfer experiments using the amplified plasmids.
  • Quantification of luciferase activity as a measure of gene transfer efficiency.

    • Main Results:

    • The presence of m6A in GATC and m5C in CC(A/T)GG sequences did not decrease luciferase activity in gene transfer experiments.
    • Plasmids amplified in standard dam(+), dcm(+) bacteria yielded significantly higher luciferase expression compared to those amplified in dam(-), dcm(-) bacteria.
    • These findings suggest that bacterial methylation does not hinder, but may enhance, gene transfer efficiency.

    Conclusions:

    • Amplifying plasmids in methylation-deficient bacteria (dam(-), dcm(-)) does not improve gene transfer efficiency.
    • Standard bacterial amplification (dam(+), dcm(+)) appears to support higher gene expression levels.
    • The study raises questions about the biological implications of introducing bacterial methylation patterns into eukaryotic systems.