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Single Cell Micro-aspiration as an Alternative Strategy to Fluorescence-activated Cell Sorting for Giant Virus Mixture Separation
Published on: October 27, 2019
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Giant viruses specific to deep oceans show persistent presence and activity
Wenwen Liu1, Komei Nagasaka1, Junyi Wu1
1Bioinformatics Center, Institute for Chemical Research, Kyoto University, Uji, Japan.
Msystems
|November 12, 2025
Summary
Giant viruses (GVs) are active in the deep ocean, with new lineages adapting to aphotic environments. This study reveals their seasonal activity and unique gene sets for survival in the dark ocean.
Area of Science:
- Marine Virology
- Deep-Sea Ecology
- Genomics
Background:
- Giant viruses (GVs) are crucial in marine ecosystems, primarily studied in surface waters.
- Their roles and adaptations in aphotic (deep-sea) environments remain largely unknown.
Purpose of the Study:
- To investigate the activity, diversity, and adaptive strategies of giant viruses in the mesopelagic and deep-sea.
- To characterize the genomic features of GVs adapted to aphotic marine environments.
Main Methods:
- Seasonal sampling of surface and mesopelagic waters.
- Integration of 18S metabarcoding, metagenomics, and metatranscriptomics.
- Global analysis of marine metagenomes and compilation of GV genomes.
Main Results:
- Identified 48 GV genomes in mesopelagic waters, with six exclusively detected and showing persistent seasonal activity.
- Discovered 101 deep-sea-specific GVs across multiple phylogenetic lineages.
- Deep-sea GVs exhibit enriched genes for ubiquitin system, energy metabolism, and nitrogen acquisition.
Conclusions:
- Distinct GV lineages have adapted to aphotic marine environments.
- These adaptations involve altered gene repertoires for thriving in low-light, low-nutrient conditions.
- This expands the understanding of GV ecology in the deep ocean.
Keywords:
adaptationdeep oceangiant virusesmetatranscriptomethe Kochi Prefectural Deep Seawater LaboratoryMore Related Videos
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