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. 2017 Mar;28(1):18-25.
doi: 10.1007/s13337-016-0353-5. Epub 2017 Feb 1.

Comparative study of viromes from freshwater samples of the Ile-Balkhash region of Kazakhstan captured through metagenomic analysis

Madina Saparbaevna Alexyuk  1 , Aizhan Sabirzhanovna Turmagambetova  1 , Pavel Gennadievich Alexyuk  1 , Andrey Pavlinovich Bogoyavlenskiy  1 , Vladimir Eleazarovich Berezin  1
Affiliations

Comparative study of viromes from freshwater samples of the Ile-Balkhash region of Kazakhstan captured through metagenomic analysis

Madina Saparbaevna Alexyuk et al. Virusdisease. 2017 Mar.

Abstract

Viruses are the most abundant biological entities on Earth and can be found in a variety of environments. A high prevalence of viruses in marine and freshwater systems was initially reported by Spencer in 1955, but the ecological significance of viruses is insufficiently known even until the present day. Viruses are known to play a key role in the biology of freshwater bacteria: controlling the bacterial abundance, composition of species, and acting as intermediaries in the transfer of genes between bacterial populations. In our study a variety of viromes of the Ile-Balkhash water basin were identified. It was found that the composition of viruses of the Ile-Balkhash region is made up not only of a wide variety of autochthonous viruses typical for phytoplankton hydro ecosystems, but also of representatives of allochthonous viruses-such families as Coronaviridae, Reoviridae and Herpesviridae-indicating anthropogenic pollution of the basin. The research designed to investigate the viral abundance, spread, infectious cycle, seasonal dynamics, composition of the viral community, and the influence of viruses on the bacteria, phytoplankton and recycling of nutrients, as well as the impact of environmental factors on the viral ecology in a variety of marine and freshwater systems is very relevant nowadays.

Keywords: Bacteriophage; Biodiversity; Metagenomics; Viromes; Water ecosystems.

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Figures

Fig. 1
Fig. 1
Recovery of nucleic acid from freshwater environment. On the abscissa axis are different reservoirs, on the ordinate axis is recovery of nucleic acid
Fig. 2
Fig. 2
The number of viruses infecting the three domains of life. On the abscissa axis are different reservoirs, on the ordinate axis is quantity of viruses of three domains (in thousands). Each domain is marked in a different color
Fig. 3
Fig. 3
Annotation of the viromes sequences. On the abscissa axis are families of viruses with different types of nucleic acids, on the ordinate axis is quantity of virus family
Fig. 4
Fig. 4
Main metabolic and structural groups of genes of bacteriophages of the Ile-Balkhash region. On the abscissa axis are metabolic and structural groups of genes of bacteriophages, on the ordinate axis is quantity of genes. Different color indicates each of the reservoirs
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