Genomic characterization of Akabane virus and Tibet orbivirus in Yunnan province
Objective To elucidate the complete genomic characteristics of the Akabane virus(AKV)DHL10M117 strain and the Tibet orbivirus(TIBOV)DH10M1019 strain,isolated from mosquito specimens collected in 2010 from Dehong prefecture,Yunnan province.Methods The complete RNA virus sequences were obtained using metatranscriptomics and high-throughput sequencing.Results The complete genome sequences of the DHL10M117 strain,consisting of the S,M,and L gene segments with lengths of 856 bp,4 309 bp,and 6 869 bp,respectively,were acquired.Phylogenetic analysis indicated that the DHL10M117 strain is an AKV strain,closely related to the AKV strain DHL10M110,isolated from Yunnan.The S and M segment phylogenetic trees revealed that the strain is closely related to AKV strains circulating in southern China and Japan,and distantly related to strains from Australia,suggesting that this strain belongs to the Asian lineage with distinct regional characteristics.Homology analysis confirmed that the gene sequences of the S,M,and L segments of the DHL10M117 strain showed 100％nucleotide and amino acid identity with the DHL10M110 strain.Additionally,the complete genome sequences of the DH10M1019 strain,comprising ten gene segments(Seg-1 to Seg-10)with lengths of 3 950 bp,2 904 bp,2 769 bp,1 978 bp,1 772 bp,1 638 bp,1 165 bp,1 142 bp,1 103 bp,and 832 bp respectively,were obtained.Phylogenetic analysis showed that DH10M1019 is a TIBOV strain,with eight gene segments(Seg-1 to Seg-4,Seg-6,Seg-8 to Seg-10)clustering with known strains in the same major branch,while Seg-5 and Seg-7 formed distinct branches,independent of known reference strains,suggesting that DH10M1019 may represent a new serotype of TIBOV.Conclusions Through complete genome sequence analysis,it was confirmed that DHL10M117 and DH10M1019 are AKV and TIBOV,which provided a scientific basis for the epidemiological characterisation,pathogenicity analysis and investigation of the two viruses.
万方数据
维普
