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Zhan, Yuanchao; Chen, Feng
Environmental microbiology, June 2019, 2019-06-00, 20190601, Volume: 21, Issue: 6Journal Article
Summary In the marine environment, only a few lytic single‐stranded DNA (ssDNA) phages have been isolated and characterized, despite the fact that diverse ssDNA bacteriophages have been discovered via metagenomic studies. In this study, we isolated and characterized a new ssDNA phage, vB_RpoMi‐Mini, which infects a marine bacterium Ruegeria pomeroyi DSS‐3. With a genome size of 4248 bp and only four putative open reading frames (ORF), vB_RpoMi‐Mini becomes the smallest ssDNA phage among the known ssDNA phage isolates and represents the DNA bacteriophage with the least number of ORFs. Genome‐wide analysis reveals that bacteriophage Mini is distantly related to the known ssDNA phages and belongs to an unclassified ssDNA phage within the Microviridae family. The presence of peptidase in vB_RpoMi‐Mini genome further implies that horizontal gene transfer could be an important driving force in the evolution of ssDNA phages. Bacteriophage Mini seems to have lost the spike protein commonly seen in ssDNA phages, suggesting that ssDNA phage can be more diverse than previously thought. Metagenomic analysis indicates that Mini‐like phages are widely distributed in the environments. The discovery of vB_RpoMi‐Mini expands our understanding of ssDNA phages in nature, and also indicates our dearth of knowledge regarding of ssDNA phages.
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