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Abstract:
The DNAs of four Mycoplasma and one Acholeplasma species were found to contain methylated bases. All of the five species contained 6-methyladenine (m6Ade), the methylated base characteristic of prokaryotic DNA. The extent of methylation of adenine residues in the mycoplasmal DNA ranged from 0.2% in Mycoplasma capricolum to about 2% in Mycoplasma arginini and Mycoplasma hyorhinis with intermediate methylation values for Mycoplasma orale and Acholeplasma laidlawii DNAs. About 5.8% of the cytosine residues in M. hyorhinis DNA were methylated also. Analysis of cell culture DNA for the presence of m6Ade as a means for detection of contamination by mycoplasmas, and the phylogenetic implications of the finding of methylated bases in mycoplasmal DNAs are discussed.
Insights
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.
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.