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Abstract
Genetic composition of natural cyanophage population in the coastal Yellow Sea area near Qingdao was investigated using the g20 gene as a genetic marker. Amplification of this gene by PCR yielded sequences, which were cloned and subjected to the restriction fragment length polymorphism (RFLP) analysis. Sixteen clones exhibiting different RFLP patterns were sequenced and analyzed. The sequence analysis indicated a diversity of cyanophages covering sixteen g20 genotypes. Their phylogenetic analysis revealed two distinct phylogenetic groups. One group (7clones) localized with the cyanophage P77 in the cluster III described before. Second group (9 clones) did not localize with any of the cyanophage described so far and was designated as a novel W cluster. The study revealed a genetic diversity of cyanophages in the coastal Yellow Sea and confirmed the genetic differences between cyanophage populations in Western and Eastern Pacific.
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