Abstract
The smallest polycistronic dsRNA segment-10 (S10) of bluetongue virus (BTV) encodes NS3/3A and putative NS5. The S10 sequence data of 46 Indian BTV field isolates obtained between 1985 and 2011 were determined and compared with the cognate sequences of global BTV strains. The largest ORF on S10 encodes NS3 (229 aa) and an amino-terminal truncated form of the protein (NS3A) and a putative NS5 (50–59 aa) due to alternate translation initiation site. The overall mean distance of the global NS3 was 0.1106 and 0.0269 at nt and deduced aa sequence, respectively. The global BTV strains formed four major clusters. The major cluster of Indian BTV strains was closely related to the viruses reported from Australia and China. A minor sub-cluster of Indian BTV strains were closely related to the USA strains and a few of the Indian strains were similar to the South African reference and vaccine strains. The global trait association of phylogenetic structure indicates the evolution of the global BTV S10 was not homogenous but rather represents a moderate level of geographical divergence. There was no evidence of an association between the virus and the host species, suggesting a random spread of the viruses. Conflicting selection pressure on the alternate coding sequences of the S10 was evident where NS3/3A might have evolved through strong purifying (negative) selection and NS5 through a positive selection. The presence of multiple positively selected codons on the putative NS5 may be advantageous for adaptation of the virus though their precise role is unknown.
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Acknowledgements
The authors are thankful to the Indian Council of Agricultural Research (ICAR), New Delhi, and the Director, ICAR-Indian Veterinary Research Institute (IVRI), Mukteswar Nainital for providing necessary facilities. This work was supported by the All India Network Program on Bluetongue [Project Code: No. 13(1)/2000-ASR-IV].
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Biswas, S.K., Mondal, B., Chand, K. et al. Genetic and phylogenetic characterization of polycistronic dsRNA segment-10 of bluetongue virus isolates from India between 1985 and 2011. Virus Genes 57, 369–379 (2021). https://doi.org/10.1007/s11262-021-01855-8
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DOI: https://doi.org/10.1007/s11262-021-01855-8