Abstract
Abstract Chinese sacbrood virus (CSBV) is a disastrous virus that fatally threatens honeybees (Apis cerana) in China. Here, we identified the complete genome of CSBV using the rapid amplification of cDNA ends (RACE) method and compared the obtained sequences with those of other SBVs through multiple sequence alignment. The results showed that the full-length of CSBV genome from Zhejiang Province (CSBV-ZJ) is 8824 bp and contains a single, large open reading frame (ORF) that encodes 2842 amino acids flanked by 190 nucleotides (nts) of the 5′-untranslated region (UTR) and 108 nts of the 3′-UTR. The multiple genome comparison showed that SBVs have five conserved domains and that CSBV-ZJ belong to SBV type II. The phylogenetic analysis demonstrated that the CSBV-ZJ strain was similar to the CSBV from Fuzhou (CSBV-FZ) strain. Colonies collected from most of the sampling sites in the area surrounding Qiandao Lake were carriers of CSBV. The haplotypes of the VP1 gene formed a network with radiated and reticular structures. In conclusion, this characterization of the CSBV-ZJ genome will help us understand the SBV prevalence mechanism and aid the protection of honeybees.
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