Prokaryotic Genome Expansion Is Facilitated by Phages and Plasmids but Impaired by CRISPR.

Abstract:

:Viruses and plasmids can introduce novel DNA into bacterial cells, thereby creating an opportunity for genome expansion; conversely, CRISPR, the prokaryotic adaptive immune system, which targets and eliminates foreign DNAs, may impair genome expansions. Recent studies presented conflicting results over the impact of CRISPR on genome expansion. In this study, we constructed a comprehensive dataset of prokaryotic genomes and identified their associations with viruses and plasmids. We found that genomes associated with viruses and/or plasmids were significantly larger than those without, indicating that both viruses and plasmids contribute to genome expansion. Genomes were increasingly larger with increasing numbers of associated viruses or plasmids. Conversely, genomes with CRISPR systems were significantly smaller than those without, indicating that CRISPR has a negative impact on genome size. These results confirmed that on evolutionary timescales, viruses and plasmids facilitate genome expansion, while CRISPR impairs such a process in prokaryotes. Furthermore, our results also revealed that CRISPR systems show a preference for targeting viruses over plasmids.

journal_name

Front Microbiol

authors

Gao NL,Chen J,Wang T,Lercher MJ,Chen WH

doi

10.3389/fmicb.2019.02254

subject

Has Abstract

pub_date

2019-10-16 00:00:00

pages

2254

issn

1664-302X

journal_volume

10

pub_type

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