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Journal of Microbiology and Related Research

Volume  2, Issue 1,  January - June 2016, Pages 43-49
 

Original Article

Molecular Typing of Bluetongue Virus 16 From Karnataka State of India

Koushlesh Ranjan*, Minakshi Prasad**, Upendera Lambe**, Madhusudan Guray**, Gaya Prasad***

*Department of Veterinary Physiology and Biochemistry, SVP University of Agriculture and Technology, Meerut, Uttar Pradesh, 250110. **Department of Animal Biotechnology, LLR University of Veterinary and Animal Sciences,Hisar, Haryana, 125004. *** SVP

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DOI: DOI: http://dx.doi.org/10.21088/jmrr.2395.6623.2116.7

Abstract

 Bluetongue disease (BT) is a vector borne infectious but noncontagious disease of wild and domestic ruminants. The BTV isolate (7bp) of sheep origin was inoculated to 9-11 day old chicken embryo followed by BHK-21 cell culture. Upon appearance of 75% cytopathic effect in cell culture viral nucleic acid was extracted. The viral nucleic acid showed BTV specific migration pattern of 3:3:3:1 in RNA-PAGE. The group specific ns1 gene RT-PCR confirmed the sample as BTV. The vp2 gene based serotype specific RT-PCR revealed the isolate as BTV16. The nucleic acid sequence of vp2 gene PCR products showed a high degree of identity (>99.0%) with other BTV16 isolates from different regions of India. It also showed maximum nucleotide identity of 99.7- 96.4% with several other eastern BTV16 viruses from India, Israel, Japan, Cyprus, Greece etc. Sequence identity study also revealed that 7bp isolate only showed 75.5% identity with western isolate of BTV16 from Nigeria. The phylogenetic study also showed a close relation between isolate in study and BTV16 isolates from India Japan, Israel and Greece which form a separate eastern cluster. Thus, molecular study showed that the isolate in study is of eastern origin and closer to BTV16 isolates from India, Greece, Japan, and Israel. 

Key words: Bluetongue Virus 16; Topotype; vp2 Gene; RT-PCR.


Corresponding Author : Minakshi Prasad**