Abstract
In order to describe a novel uncultured viral species, it is essential to obtain the DNA sequence of their full genomes. The ability to distinguish the viral genome from the genome of its bacterial host is the major challenge of the modern viromics. The major obstacles for mining of viral genomes in metagenomic assemblies is bacterial contamination in viromes and low DNA input for sequencing.
These obstacles can be overcome by flow cytometry that allows collecting free viral particles from environmental samples. In addition, fluorescence activated cell sorting reduces the bacterial contamination. By using optimized sequencing protocols, the ultra-low input DNA samples can be sequenced directly, without the need for whole genome amplification. This chapter provides details for staining of environmental viruses, flow cytometry, and direct sequencing of ultra-low input DNA samples on Illumina platform.
Key words
- Flow cytometry
- Ultra-low input DNA samples
- Viruses
- Whole genome amplification
- DNA sequencing
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References
Dutilh BE, Cassman N, McNair K et al (2014) A highly abundant bacteriophage discovered in the unknown sequences of human faecal metagenomes. Nat Commun 5:4498
Roux S, Enault F, Hurwitz BL et al (2015) VirSorter: mining viral signal from microbial genomic data. PeerJ 3:e985
Manrique P, Bolduc B, Walk ST et al (2016) Healthy human gut phageome. PNAS 113:10400–10405
Paez-Espino D, Eloe-Fadrosh EA, Pavlopoulos GA et al (2016) Uncovering Earth’s virome. Nature 536:425–430
Simmonds P, Adams MJ, Benkő M et al (2017) Consensus statement: virus taxonomy in the age of metagenomics. Nat Rev Microbiol 15:161–168
Roux S, Hallam SJ, Woyke T et al (2015) Viral dark matter and virus–host interactions resolved from publicly available microbial genomes. elife 4:e08490
Deng L, Ignacio-Espinoza JC, Gregory AC et al (2014) Viral tagging reveals discrete populations in Synechococcus viral genome sequence space. Nature 513:242–245
Bettarel Y, Sime-Ngando T, Amblard C et al (2000) A comparison of methods for counting viruses in aquatic systems. Appl Environ Microbiol 66:2283–2289
Luef B, Frischkorn KR, Wrighton KC et al (2015) Diverse uncultivated ultra-small bacterial cells in groundwater. Nat Commun 6:6372
Legendre M, Lartigue A, Bertaux L et al (2015) In-depth study of Mollivirus sibericum, a new 30,000-y-old giant virus infecting Acanthamoeba. PNAS 112:E5327–E5335
Allen LZ, Ishoey T, Novotny MA et al (2011) Single virus genomics: a new tool for virus discovery. PLoS One 6:e17722
Martinez-Hernandez F, Fornas O, Lluesma Gomez M et al (2017) Single-virus genomics reveals hidden cosmopolitan and abundant viruses. Nat Commun 8:15892
Stepanauskas R, Fergusson EA et al (2017) Improved genome recovery and integrated cell-size analyses of individual uncultured microbial cells and viral particles. Nat Commun 8:84
Pinard R, de Winter A, Sarkis G et al (2006) Assessment of whole genome amplification-induced bias through high-throughput, massively parallel whole genome sequencing. BMC Genomics 7:216
Zheng Z, Advani A, Melefors O et al (2011) Titration-free 454 sequencing using Y adapters. Nat Protoc 6:1367–1376
Džunková M, Garcia-Garcerà M, Martínez-Priego L et al (2014) Direct sequencing from the minimal number of DNA molecules needed to fill a 454 picotiterplate. PLoS One 9:e97379
Rinke C, Low S, Woodcroft BJ et al (2016) Validation of picogram- and femtogram-input DNA libraries for microscale metagenomics. PeerJ 4:e2486
Džunková M, D’Auria G, Moya A (2015) Direct sequencing of human gut virome fractions obtained by flow cytometry. Front Microbiol 6:955
Thurber RV, Haynes M, Breitbart M et al (2009) Laboratory procedures to generate viral metagenomes. Nat Protoc 4:470–483
Illumina (2017) Nextera XT DNA library prep kit reference guide. Document #15031942v02
KAPAbiosystems (2017) KAPA library quantification kits for Illumina sequencing platforms. Version 4.11
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Džunková, M. (2018). Flow Cytometry and Direct Sequencing of Viruses. In: Moya, A., Pérez Brocal, V. (eds) The Human Virome. Methods in Molecular Biology, vol 1838. Humana Press, New York, NY. https://doi.org/10.1007/978-1-4939-8682-8_1
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DOI: https://doi.org/10.1007/978-1-4939-8682-8_1
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