OBJECTIVE:To construct a system for reverse genetics of minus RNA viruses,the universal reverse genetic vector was constructed.METHODS:Using pcDNA3 as plasmid backbone,non-essential Kanamycin resistant expression cassettes and CMV promoter upstream region were removed.Then the fragment including reverse pol I promoter and multiple clone site were synthesized by PCR and inserted into the reconstructed pcDNA3.The modified pcDNA3 and universal reverse genetic vector were identified by restriction enzyme.RESULT...