Abstract：
:Two tick-borne encephalitis (TBE) virus variants were studied: mouse brain-adapted strain EK-328 and its derivate adapted to Hyalomma marginatum ticks. The tick-adapted virus exhibited small-plaque phenotype and slower replication in PEK cells, higher yield in ticks, decreased neuroinvasiveness in mice, increased binding to heparin-sepharose. A total of 15 nucleotide substitutions distinguished genomes of these variants, six substitutions resulted in protein sequence alterations, and two were in 5'NTR. Two amino acid substitutions in E protein were responsible for the observed phenotypic differences. Data obtained during reverse passaging of the tick-adapted virus in vivo and in vitro suggest that TBE virus exists as a heterogeneous population that contains virus variants most adapted to reproduction in either ticks or mammals. Host switch results in a change in the ratio of these variants in the population. Plaque purification of the tick-adapted virus resulted in the prompt emergence of new mutants with different virulence for mammals.
journal_name
Virologyjournal_title
Virologyauthors
Romanova LIu,Gmyl AP,Dzhivanian TI,Bakhmutov DV,Lukashev AN,Gmyl LV,Rumyantsev AA,Burenkova LA,Lashkevich VA,Karganova GGdoi
10.1016/j.virol.2006.12.013subject
Has Abstractpub_date
2007-05-25 00:00:00pages
75-84issue
1eissn
0042-6822issn
1096-0341pii
S0042-6822(06)00901-9journal_volume
362pub_type
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