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Annual Review of Microbiology

Volume 75, 2021

Beyond Restriction Modification: Epigenomic Roles of DNA Methylation in Prokaryotes

Abstract

The amount of bacterial and archaeal genome sequence and methylome data has greatly increased over the last decade, enabling new insights into the functional roles of DNA methylation in these organisms. Methyltransferases (MTases), the enzymes responsible for DNA methylation, are exchanged between prokaryotes through horizontal gene transfer and can function either as part of restriction-modification systems or in apparent isolation as single (orphan) genes. The patterns of DNA methylation they confer on the host chromosome can have significant effects on gene expression, DNA replication, and other cellular processes. Some processes require very stable patterns of methylation, resulting in conservation of persistent MTases in a particular lineage. Other processes require patterns that are more dynamic yet more predictable than what is afforded by horizontal gene transfer and gene loss, resulting in phase-variable or recombination-driven MTase alleles. In this review, we discuss what is currently known about the functions of DNA methylation in prokaryotes in light of these evolutionary patterns.

Keyword(s): epigenetic, gene regulation, methylation, methyltransferase, phase variation, restriction modification
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2021-10-08
2024-05-08
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/content/journals/10.1146/annurev-micro-040521-035040
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Beyond Restriction Modification: Epigenomic Roles of DNA Methylation in Prokaryotes
Annual Review of Microbiology 75, 129 (2021); https://doi.org/10.1146/annurev-micro-040521-035040
/content/journals/10.1146/annurev-micro-040521-035040
/content/journals/10.1146/annurev-micro-040521-035040
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