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Methylated bases in mycoplasmal DNA

A Razin, S Razin

    Nucleic Acids Research
    |March 25, 1980
    PubMed
    Summary

    Mycoplasma and Acholeplasma species DNA contain 6-methyladenine (m6Ade), a common prokaryotic DNA modification. This finding has implications for detecting mycoplasma contamination and understanding microbial evolution.

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    Area of Science:

    • Microbiology
    • Molecular Biology
    • Genetics

    Background:

    • Mycoplasmas are bacteria lacking cell walls, known to cause contamination in cell cultures.
    • DNA methylation is a crucial epigenetic modification in prokaryotes, often involving adenine or cytosine bases.
    • Previous research has not extensively characterized DNA methylation patterns across various Mycoplasma and Acholeplasma species.

    Purpose of the Study:

    • To investigate the presence and extent of methylated bases in the DNA of selected Mycoplasma and Acholeplasma species.
    • To assess the potential of 6-methyladenine (m6Ade) as a biomarker for mycoplasma contamination in cell cultures.
    • To explore the phylogenetic significance of DNA methylation in these organisms.

    Main Methods:

    • DNA extraction from four Mycoplasma species and one Acholeplasma species.
    • High-performance liquid chromatography (HPLC) analysis to quantify methylated bases, specifically 6-methyladenine (m6Ade) and methylated cytosine.
    • Comparative analysis of methylation levels across different species.

    Main Results:

    • All five investigated species (Mycoplasma capricolum, Mycoplasma orale, Mycoplasma arginini, Mycoplasma hyorhinis, and Acholeplasma laidlawii) contained 6-methyladenine (m6Ade).
    • Adenine methylation levels varied from 0.2% in M. capricolum to approximately 2% in M. arginini and M. hyorhinis.
    • M. hyorhinis DNA also exhibited approximately 5.8% methylation of cytosine residues.

    Conclusions:

    • The presence of m6Ade is a conserved characteristic of DNA in these Mycoplasma and Acholeplasma species.
    • m6Ade detection could serve as a reliable method for identifying mycoplasma contamination in biological samples.
    • DNA methylation patterns may offer insights into the evolutionary relationships and taxonomy of mollicutes.

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