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Viruses 2015, 7(7), 3937-3953;

Tsv-N1: A Novel DNA Algal Virus that Infects Tetraselmis striata

Department of Biology, University of Bergen, Bergen 5006, Norway
Biologie, ENS de Lyon, Lyon 69007, France
Institute of Natural and Technical Systems, Russian Academy of Sciences, Sevastopol 299000, Russia
Author to whom correspondence should be addressed.
Academic Editor: Thomas Hohn
Received: 8 June 2015 / Revised: 3 July 2015 / Accepted: 7 July 2015 / Published: 17 July 2015
(This article belongs to the Section Viruses of Plants, Fungi and Protozoa)
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Numbering in excess of 10 million per milliliter of water, it is now undisputed that aquatic viruses are one of the major factors shaping the ecology and evolution of Earth’s microbial world. Nonetheless, environmental viral diversity and roles remain poorly understood. Here we report the first thorough characterization of a virus (designated TsV) that infects the coastal marine microalga Tetraselmis striata. Unlike previously known microalgae-infecting viruses, TsV is a small (60 nm) DNA virus, with a 31 kb genome. From a range of eight different strains belonging to the Chlamydomonadaceae family, TsV was only able to infect T. striata. Gene expression dynamics revealed an up-regulation of viral transcripts already 1 h post-infection (p.i.). First clear signs of infection were observed 24 h p.i., with the appearance of viral factories inside the nucleus. TsV assembly was exclusively nuclear. TsV-N1 genome revealed very different from previously known algae viruses (Phycodnaviridae). Putative function and/or homology could be resolved for only 9 of the 33 ORFs encoded. Among those was a surprising DNA polymerase type Delta (only found in Eukaryotes), and two genes with closest homology to genes from human parasites of the urogenital tract. These results support the idea that the diversity of microalgae viruses goes far beyond the Phycodnaviridae family and leave the door open for future studies on implications of microalgae viruses for human health. View Full-Text
Keywords: microalgae; viruses; viral genomics; viral taxonomy; infection dynamics; viral factory; horizontal gene transfer microalgae; viruses; viral genomics; viral taxonomy; infection dynamics; viral factory; horizontal gene transfer

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Pagarete, A.; Grébert, T.; Stepanova, O.; Sandaa, R.-A.; Bratbak, G. Tsv-N1: A Novel DNA Algal Virus that Infects Tetraselmis striata. Viruses 2015, 7, 3937-3953.

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