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[Complete genome sequencing and analyses of rabies viruses isolated from wild animals (Chinese Ferret-Badger) in Zhejiang province].

OBJECTIVE
Based on sequencing the full-length genomes of two Chinese Ferret-Badger, we analyzed the properties of rabies viruses genetic variation in molecular level to get information on prevalence and variation of rabies viruses in Zhejiang, and to enrich the genome database of rabies viruses street strains isolated from Chinese wildlife.


METHODS
Overlapped fragments were amplified by RT-PCR and full-length genomes were assembled to analyze the nucleotide and deduced protein similarities and phylogenetic analyses of the N genes from Chinese Ferret-Badger, sika deer, vole, dog. Vaccine strains were then determined.


RESULTS
The two full-length genomes were completely sequenced to find out that they had the same genetic structure with 11 923 nts including 58 nts-Leader, 1353 nts-NP, 894 nts-PP, 609 nts-MP, 1575 nts-GP, 6386 nts-LP, and 2, 5, 5 nts- intergenic regions (IGRs), 423 nts-Pseudogene-like sequence (Psi), 70 nts-Trailer.


CONCLUSION
The two full-length genomes were in accordance with the properties of Rhabdoviridae Lyssa virus by blast and multi-sequence alignment. The nucleotide and amino acid sequences among Chinese strains had the highest similarity, especially among animals of the same species. Of the two full-length genomes, the similarity in amino acid level was dramatically higher than that in nucleotide level, so that the nucleotide mutations happened in these two genomes were most probably as synonymous mutations. Compared to the referenced rabies viruses, the lengths of the five protein coding regions did not show any changes or recombination, but only with a few-point mutations. It was evident that the five proteins appeared to be stable. The variation sites and types of the two ferret badgers genomes were similar to the referenced vaccine or street strains. The two strains were genotype 1 according to the multi-sequence and phylogenetic analyses, which possessing the distinct geographyphic characteristics of China. All the evidence suggested a cue that these two ferret badgers rabies viruses were likely to be street virus that already circulating in wildlife.