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 we

SUBMITTER: Gao NL 

PROVIDER: S-EPMC6805729 | biostudies-literature | 2019

REPOSITORIES: biostudies-literature