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Methylome Diversification through Changes in DNA Methyltransferase Sequence Specificity


Living organisms are affected by epigenetic variation in addition to DNA sequence variation. DNA methylation is one of the most studied epigenetic modifications in both prokaryotes and eukaryotes. In prokaryotes, most DNA methylation is by DNA methyltransferases with high sequence specificity. Helicobacter pylori, a human stomach pathogen responsible for stomach cancer and other diseases, carries a large number of DNA methyltransferase genes that vary among strains. In this work, we examined the distribution of DNA methylation in multiple H. pylori genomes using single-molecule real-time sequencing technology, which detects DNA methylation with single-base resolution. Comparison of methylation motifs between closely related genomes allowed assignment of a recognition sequence to each DNA methylation specificity-determining gene. Highly methylated genes were detected, although the general DNA methylation pattern varied among strains. Knockout of a methylation specificity-determining gene led to changes in the transcriptome. These findings are consistent with our hypothesis that changes in the methylome lead to changes in the transcriptome and to changes in phenotypes, providing potential targets for natural and artificial selection in adaptive evolution.


Vyšlo v časopise: Methylome Diversification through Changes in DNA Methyltransferase Sequence Specificity. PLoS Genet 10(4): e32767. doi:10.1371/journal.pgen.1004272
Kategorie: Research Article
prolekare.web.journal.doi_sk: https://doi.org/10.1371/journal.pgen.1004272

Souhrn

Living organisms are affected by epigenetic variation in addition to DNA sequence variation. DNA methylation is one of the most studied epigenetic modifications in both prokaryotes and eukaryotes. In prokaryotes, most DNA methylation is by DNA methyltransferases with high sequence specificity. Helicobacter pylori, a human stomach pathogen responsible for stomach cancer and other diseases, carries a large number of DNA methyltransferase genes that vary among strains. In this work, we examined the distribution of DNA methylation in multiple H. pylori genomes using single-molecule real-time sequencing technology, which detects DNA methylation with single-base resolution. Comparison of methylation motifs between closely related genomes allowed assignment of a recognition sequence to each DNA methylation specificity-determining gene. Highly methylated genes were detected, although the general DNA methylation pattern varied among strains. Knockout of a methylation specificity-determining gene led to changes in the transcriptome. These findings are consistent with our hypothesis that changes in the methylome lead to changes in the transcriptome and to changes in phenotypes, providing potential targets for natural and artificial selection in adaptive evolution.


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Genetika Reprodukčná medicína

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