Biological properties and phylogenetic relationships of tick-borne encephalitis virus (Flaviviridae, Flavivirus) isolates of siberian subtype isolated in the south of East siberia in modern period
- Authors: Mel’nikova O.V.1, Adel’shin R.V.1,2, Lopatovskaya K.V.1, Trushina Y.T.1, Yakovchits N.V.1, Andaev E.I.1
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Affiliations:
- FSHI «Irkutsk Anti-plague Research Institute of Siberia and Far East» of the Surveillance of Consumer Rights Protection and Human Wellbeing (Rospotrebnadzor)
- FSBEI HE «Irkutsk State University»
- Issue: Vol 66, No 4 (2021)
- Pages: 310-321
- Section: ORIGINAL RESEARCH
- URL: https://journal-vniispk.ru/0507-4088/article/view/118200
- DOI: https://doi.org/10.36233/0507-4088-55
- ID: 118200
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Abstract
Introduction. Tick-borne encephalitis virus (TBEV) is medically most important representative of the same-name serogroup of genus Flavivirus (Flaviviridae). In the view of various researchers there are 3 to 5 TBEV subtypes, of them siberian being the most prevalent. The aim of the work is to compare the biological properties and to reveal phylogenetic relationships of large group of modern (2006–2019) TBEV isolates of siberian subtype from natural foci in southern East Siberia.
Material and methods. Ixodid ticks (Ixodidae) and small mammals (Mammalia) from tick-borne encephalitis (TBE) natural foci in Irkutsk Region, Republic of Buryatia and Republic of Tuva, as well as specimens from TBE patients, were examined for TBEV markers using enzyme-linked immunosorbent assay (ELISA) and reverse transcription polymerase chain reaction (RT-PCR). Virus was isolated from suspensions with positive result, and its pathogenicity for white mice (Mus) (WM) was studied by different inoculation ways. Analysis of the nucleotide sequences of E gene was performed for isolates at 1st passage. Phylogenetic tree was constructed using MEGA X program.
Results. The phylogenetic analysis has shown that TBEV of siberian subtype that circulates in natural foci of the studied territory belong to two genetic lines. These lines are «Vasilchenko» and «Zausaev» with a strong predominance of the first. The differences in biological properties between the two groups of strains have been demonstrated. Most of the strains from both groups showed high virulence for WM both after intracerebral and subcutaneous inoculation. Only four strains demonstrated the reduced ability to overcome the blood-brain barrier. However, the analysis of the E protein coding sequences revealed evident correlation between phylogenetic clustering and geographical origin of isolates, but not with TBE host or pathogenicity for WM.
Conclusion. Further search for TBE genome regions associated with pathogenicity require the analysis of complete genome sequences of representative group of strains with different biological properties.
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##article.viewOnOriginalSite##About the authors
O. V. Mel’nikova
FSHI «Irkutsk Anti-plague Research Institute of Siberia and Far East» of the Surveillance of Consumer Rights Protection and Human Wellbeing (Rospotrebnadzor)
Author for correspondence.
Email: melnikovaovit@gmail.com
ORCID iD: 0000-0001-5133-0323
Ol’ga V. Mel’nikova, D.Sci. (Biol.), Senior Researcher of the Laboratory of Natural-Foci Viral Infections
664047, Irkutsk, Russia
Russian FederationR. V. Adel’shin
FSHI «Irkutsk Anti-plague Research Institute of Siberia and Far East» of the Surveillance of Consumer Rights Protection and Human Wellbeing (Rospotrebnadzor); FSBEI HE «Irkutsk State University»
Email: fake@neicon.ru
ORCID iD: 0000-0003-3690-3992
664047, Irkutsk, Russia
664003, Irkutsk, Russia
Russian FederationK. V. Lopatovskaya
FSHI «Irkutsk Anti-plague Research Institute of Siberia and Far East» of the Surveillance of Consumer Rights Protection and Human Wellbeing (Rospotrebnadzor)
Email: fake@neicon.ru
ORCID iD: 0000-0002-8772-5842
664047, Irkutsk, Russia
Russian FederationYu. T. Trushina
FSHI «Irkutsk Anti-plague Research Institute of Siberia and Far East» of the Surveillance of Consumer Rights Protection and Human Wellbeing (Rospotrebnadzor)
Email: fake@neicon.ru
ORCID iD: 0000-0003-4501-146X
664047, Irkutsk, Russia
Russian FederationN. V. Yakovchits
FSHI «Irkutsk Anti-plague Research Institute of Siberia and Far East» of the Surveillance of Consumer Rights Protection and Human Wellbeing (Rospotrebnadzor)
Email: fake@neicon.ru
ORCID iD: 0000-0002-9994-0371
664047, Irkutsk, Russia
Russian FederationE. I. Andaev
FSHI «Irkutsk Anti-plague Research Institute of Siberia and Far East» of the Surveillance of Consumer Rights Protection and Human Wellbeing (Rospotrebnadzor)
Email: fake@neicon.ru
ORCID iD: 0000-0002-6612-479X
664047, Irkutsk, Russia
Russian FederationReferences
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