Abstract
Bovine respiratory syncytial virus (BRSV) is an important viral agent in bovine respiratory disease complex affecting young calves from asymptomatic to fatal. Although BRSV is widely prevalent in Türkiye as in other parts of the world, there are limited molecular studies on BRSV in Türkiye. Therefore, in order to better understand the characteristics of circulating BRSV in Türkiye, a study based on the molecular analysis of both F and G proteins was performed. For this purpose, the presence of BRSV was investigated in 20 calves that died as a result of severe respiratory syndrome in the western region of Türkiye in 2020. Nested PCR was performed for both gene regions, and the products were sequenced. Four samples detected as BRSV positive were identified as genotype III according to both gene regions in molecular analysis. However, they were separated into two distinct clusters due to significant differences in nucleotide (90.09–99.54%) and amino acid (85.42–99.31%) similarities between them. Besides, two positive samples in the same cluster were even more different from previously detected Turkish isolates (90.78–92.17% nt and 87.50–89.58% aa). More over, we detected nine novel aa mutations in the extracellular domain, an immunologically important region in the G protein of the virus, that have not been reported in other world isolates found in Genbank until now. These findings suggest that there may be many different viruses in circulation that have the ability to escape the immune system. We recommend that these findings be taken into account in planning both vaccine and epidemiological studies.
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Data availability
All data generated or analysed during this study are included in this published article. The datasets generated for this study can be found in NCBI, MW892048, MW892049, MW892050 and MZ476914 for F gene; MW892044, MW892045, MW892046 and MW892047 for G gene of the detected BRSV.
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This study was supported and officially permissied by Ministry of Agriculture and Forestry of The Republic of Türkiye.
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This study was supported and funded by Agriculture and Foresty of the Republic of Türkiye and İzmir/Bornova Veterinary Control Institute.
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Kaplan, M., Özan, E., Pekmez, K. et al. Molecular characterization of G and F protein genes of bovine respiratory syncytial virus detected from dead calves caused by severe respiratory syndrome: emergence of novel mutations and their importance. VirusDis. 34, 539–549 (2023). https://doi.org/10.1007/s13337-023-00846-7
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DOI: https://doi.org/10.1007/s13337-023-00846-7