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Genetic Analysis of the Complete G Gene of Viral Hemorrhagic Septicemia Virus (VHSV) Genotype Ie Isolates from Turkey

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Genetic Analysis of the Complete G Gene of Viral Hemorrhagic Septicemia Virus (VHSV) Genotype Ie Isolates from Turkey Genetic analysis of the complete G gene of viral hemorrhagic septicemia virus (VHSV) genotype Ie isolates from Turkey Item Type article Authors Albayrak, H.; Isidan, H.; Kalayci, G.; Ozan, E.; Vakharia, V.N. Download date 06/10/2021 08:54:49 Link to Item http://hdl.handle.net/1834/37900 Iranian Journal of Fisheries Sciences 17(1) 67-73 2018 DOI: 10.22092/IJFS.2018.115585 Genetic analysis of the complete G gene of viral hemorrhagic septicemia virus (VHSV) genotype Ie isolates from Turkey Albayrak H.1*; Isidan H.2 ; Kalayci G.3 ; Ozan E.4 ; Vakharia V.N.5 Received: May 2015 Accepted: June 2016 Abstract Viral hemorrhagic septicemia virus (VHSV) is an enveloped non-segmented, single- stranded, negative-sense RNA virus that belongs to the Novirhabdovirus genus of the family Rhabdoviridae. This virus causes economically significant diseases in farmed rainbow trout, in Turkey, which is often associated with the transmission of pathogens from European resources. In this study, moribund rainbow trout (Oncorhynchus mykiss) samples were collected during an outbreak of VHSV in a rainbow trout fish farm in Bolu Province of Turkey in 2006. In addition, two VHSV strains were isolated from wild turbot (Scophthalmus maximus) in Trabzon Province of the Black Sea region of Turkey during a field survey. We have sequenced the full-length glycoprotein (G) gene of three VHSV isolates and compared them with 25 previously published gene sequences. Based on a complete gene nucleotide sequence, Turkish VHSV isolates were classified into class Ie of genotype I, which is closely related to GE-1.2 isolate (97.1-97.5% nucleotide identity and 98.2-98.4% amino acid identity) found in Georgia more than 30 years ago. These isolates could be an indigenous type of VHSV Downloaded from jifro.ir at 12:07 +0330 on Tuesday March 6th 2018 distributed in the Black Sea. On the other hand, Turkish isolates have 97.5-97.6% nucleotide identity and 98.8-99% amino acid identity with Finnish, Danish, and Norwegian isolates which are classified under Ib and Id. These results suggest that Turkish VHSV isolates may have orginated from Europe and co-circulated with indigenous strains which can threaten the aquaculture industry in Turkey. Keywords: Genotype, Rainbow trout, Turbot, Turkey, VHSV 1-Department of Virology, Faculty of Veterinary Medicine, Ondokuz Mayis University, Samsun, Turkey 2-Department of Virology, Faculty of Veterinary Medicine, Cumhuriyet University, Sivas, Turkey 3-Department of Virology, Bornova Veterinary Control Institute, İzmir, Turkey 4-Department of Virology, Veterinary Control Institute, Samsun, Turkey 5-Institute of Marine and Environmental Technology, University of Maryland Baltimore County, Baltimore, MD, 21202, USA *Corresponding author's Email: [email protected] 68 Albayrak et al., Genetic analysis of the complete G gene of viral hemorrhagic septicemia virus ... Introduction a rainbow trout farm in Bolu Province Viral hemorrhagic septicemia virus in 2006 (Kalayci et al., 2006), while (VHSV) is an enveloped non- many outbreaks occurred in European segmented, single-stranded, negative- countries (Smail, 2000). Surely the lack sense RNA virus that belongs to the of reports on VHSV does not prove the Novirhabdovirus genus of the family absence of the disease in Turkey before Rhabdoviridae. The virus genome 2004. Many rainbow trout farms encodes the nucleocapsid protein (N), produce larvae and transport them to polymerase associated phosphoprotein other farms. In addition, a significant (P), matrix protein (M), surface number of rainbow trout is being glycoprotein (G) and viral polymerase transported from fresh water to marine (L) gene and a non-structural protein ecosystems. These activities make it (NV) gene (Ammayappan and easy to spread diseases. The presence of Vakharia, 2009; He et al., 2014; Kim et viral hemorrhagic septicemia virus has al., 2015). Viral hemorrhagic already been known in the Black Sea septicemia (VHS) is one of the most (Nishizawa et al., 2006; Işıdan and serious viral diseases of the aquaculture Bolat, 2011). According to fishermen, industry worldwide. VHSV causes turbot stocks of the Black Sea have disease not only in salmonids, but in indicatively reduced in recent years. many other marine species as well. The Considering the prevalance of VHS in virus usually causes severe turbot, VHS may be responsible for this hemorrhages on the skin, the kidney reducion. The result brings some very and the liver, with mortality rates as important questions. Are Turkish high as 90% (Smail, 2000; Kalayci et VHSV isolates pathogenic for marine al., 2006). and freshwater fish species? Could the Downloaded from jifro.ir at 12:07 +0330 on Tuesday March 6th 2018 Phylogenetic analysis based on the disease be transmitted from turbot to nucleotide sequences of G gene of trout in sea cages? To answer this VHSV isolates from marine and question, one needs to perform a freshwater fish revealed four challange study using the Turkish genogroups (I–IV) and a number of VHSV isolates. sublineages (Ia–Ie, IVa–IVb). The The partial and complete nucleotide genotypes appear to be more associated sequences of VHSV have previously with geographical distribution rather been determined (Einer-Jensen et al., than host species (Nishizawa et al., 2004). In this study, we characterized 2006; Einer-Jensen et al., 2004; the entire glycoprotein gene of the three Ghorani et al., 2016). Turkish VHSV isolates, Bolu/06 from Until 2004, there was no report on rainbow trout, Oncorhynchus mykiss VHS in Turkey even though it is the (Walbaum), detected from an outbreak biggest trout producer of Europe. Only in freshwater in Bolu province, ckc-4 one outbreak of VHSV was reported in and TR-WS13G from turbot, Psetta Iranian Journal of Fisheries Sciences 17(1) 2018 69 maxima (L.), caught from the Black Center for Biotechnology Information Sea, Trabzon, Turkey in 2009. (NCBI). The complete glicoprotein Although all of the VHSV-positive genome sequences were aligned; highly turbot fish exhibited no clinical signs of conserved sequence segments disease, affected rainbow trout fish identified, and used to design exhibited congestion of internal organs; overlapping primers. The the inner wall of the swim bladder was oligonucleotide primers used in this thickened and contained numerous study, VHSVGF (5’-ATG GAA TGG budding, fluid-filled vesicles. The AAT ACT TTT TTC TT-3’) and Black Sea is a major sea in Turkey that VHSVGR (5’-TCA GAC CAT CGG has historically supported an GTT TCT GGA GAA-3’), are for economically and socially important amplification of a 1524-base region of sport fishery for many species of fish. the VHSV G gene. First strand VHSV has a very broad host-range, synthesis was carried out in a tube including numerous taxonomic families containing 5 μL of RNA, which was of fish. VHSV has been found in many denatured at 70°C for 10 min in the different host species. It is a serious presence of DMSO (3 μL), 1 μL threat to all aquaculture species, forward gene-specific primer, 1 μL of including salmonids such as trout and 25 mM dNTPs, and snap-cooled on ice salmon (Ammayappan and Vakharia, for 1 min. The reaction mixture 2009). To understand the molecular containing 2 μL of 10× RT buffer, 2 μL characteristics of the Turkey VHSV of 0.1 M DTT, 4 μL of 25 mM MgCl2, strains, we thoroughly analyzed the 1 μL of Superscript III RT™, and 1 μL entire glicoprotein gene sequences and of RNase OUT™ was incubated at compared them with other VHSV 50°C for 1 h. PCR amplifications were Downloaded from jifro.ir at 12:07 +0330 on Tuesday March 6th 2018 strains. carried out using a pfx™ PCR kit (Invitrogen, CA), according to Materials and methods manufacturer's instructions. Briefly, the The genomic RNAs of Turkish VHSV following mixture was used for PCR strains (Bolu/06, ckc-4 and TR- amplification: 3 μL of cDNA, 2 μL of WS13G) were kindly provided by Dr. primer mix; 5 μL of 10× PCR buffer Gulnur Kalayci, Bornova Veteriner [100 mM Tris-HCl (pH 9.0), 500 mM Control Institute, Izmir, Turkey and KC1, 1% Triton X-100], 2 μL of 25 Hakan Isidan, Cumhuriyet University, mM MgCl2, 0.5 μL of pfx polymerase, Faculty of Veterinary Medicine, Sivas, and 37 μL of DEPC water, to make a Turkey and were used as a template. final volume of 50 μL. The reaction was The consensus PCR primers were carried out in a thermal cycler (MJ designed based on the available VHSV Research Inc., Waltham, MA), using genome sequences (Genbank accession the following program: denaturation at number AY546619) from the National 94°C for 30 sec; annealing for 30 sec at 70 Albayrak et al., Genetic analysis of the complete G gene of viral hemorrhagic septicemia virus ... 60°C; and extension at 68°C for 2 min. 99% at nucleotide and 99.4% amino The RT-PCR products were separated acid levels) between Bolu/06 and ckc-4 by agarose gel electrophoresis and isolates; 24 bases of nucleotide purified using a QIAquick gel substitution and one residue of amino extraction kit (Qiagen, CA). acid substitution (sequence identities of The purified RT-PCR products were 98.4% at nucleotide and 99.6% amino cloned into a pGEM®-T Easy vector acid levels) between ckc-4 and TR- vector (Promega, WI). Plasmid DNA WS13G isolates, were observed. The from various clones was sequenced by complete G gene comparison of dideoxy chain termination method, Turkish VHSV isolates with other using an automated DNA sequencer VHSVs reveals a close relationship (Applied Biosystems, CA). The pair- with strains from Finland, Norway, and wise nucleotide identity and Georgia, which were isolated from comparative sequence analyses were rainbow trout and Atlantic cod, conducted using Vector NTI Advance respectively [FI-ka-66 (Finland), GE- 11 software (Invitrogen, CA) and 1.2 (Georgia) (97.5%) and NO- BLAST search from NCBI.
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