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Song, Kai
Frontiers in microbiology, 11/2020, Letnik: 11Journal Article
Phages are viruses that infect bacteria. The phages can be classified into two different categories based on their lifestyles: temperate and lytic. Now, the metavirome can generate a large number of fragments from the viral genomic sequences of entire environmental community, which makes it impossible to determine their lifestyles through experiments. Thus, there is a need to development computational methods for annotating phage contigs and making prediction of their lifestyles. Alignment-based methods for classifying phage lifestyle are limited by incomplete assembled genomes and nucleotide databases. Alignment-free methods based on the frequencies of k -mers were widely used for genome and metagenome comparison which did not rely on the completeness of genome or nucleotide databases. To mimic fragmented metagenomic sequences, the temperate and lytic phages genomic sequences were split into non-overlapping fragments with different lengths, then, I comprehensively compared nine alignment-free dissimilarity measures with a wide range of choices of k -mer length and Markov orders for predicting the lifestyles of these phage contigs. The dissimilarity measure, d 2 S , performed better than other dissimilarity measures for classifying the lifestyles of phages. Thus, I propose that the alignment-free method, d 2 S , can be used for predicting the lifestyles of phages which derived from the metagenomic data.
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