The Fennoscandian Shield deep terrestrial virosphere suggests slow motion ‘boom and burst’ cycles

• Published in: Communications Biology
• Main Authors: Holmfeldt, Karin, Nilsson, Emelie, Simone, Domenico, Lopez-Fernandez, Margarita, Wu, Xiaofen, de Bruijn, Ino, Lundin, Daniel, Andersson, Anders F., Bertilsson, Stefan, Dopson, Mark
• Other Authors: Vetenskapsrådet, Crafoordska Stiftelsen, Nova Center for University Studies, Research and Development Familjen Hellmans stiftelse
• Format: Article in Journal/Newspaper
• Language: English
• Published: Springer Science and Business Media LLC 2021
• Subjects: General Agricultural and Biological Sciences; General Biochemistry, Genetics and Molecular Biology; Medicine (miscellaneous); Fennoscandian
• Online Access: http://dx.doi.org/10.1038/s42003-021-01810-1; http://www.nature.com/articles/s42003-021-01810-1.pdf; http://www.nature.com/articles/s42003-021-01810-1

Abstract The deep biosphere contains members from all three domains of life along with viruses. Here we investigate the deep terrestrial virosphere by sequencing community nucleic acids from three groundwaters of contrasting chemistries, origins, and ages. These viromes constitute a highly unique community compared to other environmental viromes and sequenced viral isolates. Viral host prediction suggests that many of the viruses are associated with Firmicutes and Patescibacteria, a superphylum lacking previously described active viruses. RNA transcript-based activity implies viral predation in the shallower marine water-fed groundwater, while the deeper and more oligotrophic waters appear to be in ‘metabolic standby’. Viral encoded antibiotic production and resistance systems suggest competition and antagonistic interactions. The data demonstrate a viral community with a wide range of predicted hosts that mediates nutrient recycling to support a higher microbial turnover than previously anticipated. This suggests the presence of ‘kill-the-winner’ oscillations creating slow motion ‘boom and burst’ cycles.