{"id":28636,"date":"2018-02-28T10:48:24","date_gmt":"2018-02-28T14:48:24","guid":{"rendered":"http:\/\/www.fondriest.com\/news\/?p=28636"},"modified":"2018-02-27T10:48:34","modified_gmt":"2018-02-27T14:48:34","slug":"undercover-marine-bacteria-killers-new-lineage-non-tailed-viruses-identified","status":"publish","type":"post","link":"https:\/\/www.fondriest.com\/news\/undercover-marine-bacteria-killers-new-lineage-non-tailed-viruses-identified.htm","title":{"rendered":"Undercover Marine Bacteria Killers: New Lineage of Non-tailed Viruses Identified"},"content":{"rendered":"

New research<\/span><\/a> from MIT and the Albert Einstein College of Medicine has identified a group of killers that have been at large in our oceans for an unknown period of time: non-tailed viruses responsible for regulating populations of bacteria. These viruses have been undercover indefinitely, because although they have dominated oceanic water samples, they’ve never been subjected to analysis before, out of reach of standard tests.<\/span><\/p>\n

The variety the team describes is called <\/span>Autolykiviridae<\/span><\/i>, after Greek mythology’s Autolycus, who was extremely difficult to catch, an expert in covering his tracks. Dr. Kathryn Kauffman of MIT’s Parsons Laboratory for Environmental Science and Engineering spoke to EM about the discovery.<\/span><\/p>\n

\u201cScientists knew that non-tailed viruses dominate surface oceans (from electron microscopy images), but we didn\u2019t know who they infected or what their genomes looked like,\u201d explained Dr. Kauffman. \u201cThough the <\/span>Autolykiviridae<\/span><\/i> that we describe are just one type of non-tailed viruses, they have helped us to learn that the way viruses are commonly sampled and analyzed has likely led to many other related non-tailed viruses also often being missed. And yes, because most double stranded DNA bacterial viruses isolated from the ocean have tails, we were initially surprised to discover that we had non-tailed viruses in our collection and also that many of them had such noticeably broad host ranges.\u201d<\/span><\/p>\n

In other words, the discovery has highlighted a probable blind spot in our current understanding of bacterial diversity\u2014a significant omission of notable ecological relevance. Unlike their tailed cousins, these non-tailed viruses are not confined to infecting one or two bacteria, but can infect dozens of species.<\/span><\/p>\n

\u201cThe impacts of viral infection on bacterial populations are complex\u2014whether they represent boon or bane can depend on the time frame and the scale, and predicting the impact of viruses on microbial systems is an important area of continuing work,\u201d details Dr. Kauffman. \u201cAs we show that DJR [double jelly roll] viruses are far more diverse than currently known, and that their impacts on hosts can be quite different from the traditionally studied tailed viruses, our work highlights the importance of ensuring that the scope and methods of future studies are designed to include non-tailed viruses.\u201d<\/span><\/p>\n

Tracking down the elusive suspect<\/span><\/h3>\n

The team cultivated hundreds of viruses from seawater using methods that they now know allow the <\/span>Autolykiviridae<\/span><\/i> to survive and be detected.<\/span><\/p>\n

\u201cWhere other studies might often use chloroform to remove contaminating bacteria from their virus samples, we did not\u2014this was fortuitous because chloroform renders the <\/span>Autolykiviridae<\/span><\/i> and other lipid containing viruses uninfective; had we used it we wouldn\u2019t have seen them, Dr. Kauffman states. \u201cWe also used a cultivation approach that prevented viruses from overgrowing each other in lab, and we waited two weeks to harvest our samples\u2014in this way we were able to detect killing by the <\/span>Autolykiviridae<\/span><\/i>, many of which took longer than the traditional viruses to reveal their presence by killing their hosts in agar overlay assays.\u201d<\/span><\/p>\n

The team was also able to sequence the DNA of the <\/span>Autolykiviridae<\/span><\/i> and study their physical properties because they were able to cultivate the viruses and amplify large numbers of them. This revealed that they are also subject to loss in several other methodological approaches commonly used in studies of viruses.<\/span><\/p>\n

\"autolykiviridae\"

Autolykiviridae is a new family of non-tailed dsDNA viruses in the DJR capsid lineage. (Credit: Kauffman et al.)<\/p><\/div>\n

\u201cFor those interested in performing future isolation studies of bacterial viruses that are not biased against viruses like the <\/span>Autolykiviridae<\/span><\/i>, we recommend not using chloroform or density gradients during isolations, using agar overlay approaches rather than enrichments, allowing for extended incubations of at least several days and up to several weeks, and being sure to include protease treatments during extraction,\u201d adds Dr. Kauffman.<\/span><\/p>\n

Does the slower killing of bacteria by these tailless viruses in the lab mean that they are slower killers in the wild? Not necessarily.<\/span><\/p>\n

\u201cIt may be, for example, that the receptors on the bacteria that the viruses need to attach and enter the cell are not expressed in laboratory cultures until the bacteria are stressed, but if those cells are more commonly stressed in the wild then those receptors will be more readily available and viruses might infect their hosts there quite quickly,\u201d Dr. Kauffman explains. \u201cIn any case what it does suggest is that the non-tailed viruses can interact quite differently with their hosts than the tailed viruses, and so until we understand that better we are still missing part of the story.\u201d<\/span><\/p>\n

Understanding the <\/span>Autolykiviridae<\/span><\/i><\/span><\/h3>\n

The evolutionary lineages that produced tailed and non-tailed double stranded DNA viruses are entirely separate. What defines these two ancient lineages is the proteins that comprise their capsids or \u201cheads.\u201d Tailed viruses are in the HK97 lineage, and non-tailed viruses such as the autolykiviruses are from the \u201cdouble jelly roll\u201d or DJR lineage.<\/span><\/p>\n

\u201cWhat\u2019s surprising is that though both of these lineages are ancient, only very few double jelly roll viruses are known to infect bacteria and archaea even though there are plenty of them that infect humans and fungi and protists and other eukaryotes,\u201d remarks Dr. Kauffman. \u201cKnowing more about the double jelly roll viruses that infect bacteria and archaea will help us to better understand how the great diversity of double jelly roll viruses emerged that infects all over the tree of life.\u201d<\/span><\/p>\n

And while predicting the functional consequences of the presence of different viruses in microbial communities is likely to remain a challenge, studies that attempt to tease out these kinds of questions, such as how important different varieties of viruses are to water quality, will be far more effective once all viral actors in the system are accounted for.<\/span><\/p>\n

\u201cThe greatest impact of our work is not the discovery of the new virus family per se, but rather that we show that non-tailed dsDNA bacterial and archaeal viruses are far more diverse, abundant, and active than is currently appreciated, and that biases in methods that we, as a field, thought might not matter much, in fact probably do matter quite a bit in terms of getting the full story,\u201d adds Dr. Kauffman.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

The Pennsylvania Department of Environmental Protection is using benthic macroinvertebrates to monitor water quality and making their data public.<\/p>\n","protected":false},"author":31,"featured_media":28635,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7,9],"tags":[245,103,109,538],"class_list":["post-28636","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","category-science_library-htm","tag-mit","tag-news-2","tag-news-ticker","tag-science-library"],"remote_post_permalink":false,"remote_post_featured_image":false,"yoast_head":"\nUndercover Marine Bacteria Killers: New Lineage of Non-tailed Viruses Identified<\/title>\n<meta name=\"description\" content=\"The Pennsylvania Department of Environmental Protection is using benthic macroinvertebrates to monitor water quality and making their data public.\" \/>\n<meta name=\"robots\" content=\"index, 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