期刊
NATURE BIOTECHNOLOGY
卷 30, 期 12, 页码 1232-+出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/nbt.2432
关键词
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资金
- US National Science Foundation [IIS0916439]
- NIH [R37 AI-42347]
- HHMI
- Div Of Information & Intelligent Systems
- Direct For Computer & Info Scie & Enginr [0916439] Funding Source: National Science Foundation
Single-molecule real-time (SMRT) DNA sequencing allows the systematic detection of chemical modifications such as methylation but has not previously been applied on a genome-wide scale. We used this approach to detect 49,311 putative 6-methyladenine (m6A) residues and 1,407 putative 5-methylcytosine (m5C) residues in the genome of a pathogenic Escherichia coli strain. We obtained strand-specific information for methylation sites and a quantitative assessment of the frequency of methylation at each modified position. We deduced the sequence motifs recognized by the methyltransferase enzymes present in this strain without prior knowledge of their specificity. Furthermore, we found that deletion of a phage-encoded methyltransferase-endonuclease (restriction-modification; RM) system induced global transcriptional changes and led to gene amplification, suggesting that the role of RM systems extends beyond protecting host genomes from foreign DNA.
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