{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,23]],"date-time":"2026-10-23T03:29:16Z","timestamp":1792726156153,"version":"4.5.0"},"reference-count":71,"publisher":"American Society for Microbiology","issue":"6","license":[{"start":{"date-parts":[[2011,3,15]],"date-time":"2011-03-15T00:00:00Z","timestamp":1300147200000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.asm.org\/non-commercial-tdm-license"}],"content-domain":{"domain":["journals.asm.org"],"crossmark-restriction":true},"short-container-title":["J Virol"],"published-print":{"date-parts":[[2011,3,15]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n          <jats:p>\n            Reverse genetics is a powerful tool to study single-stranded RNA viruses. Despite tremendous efforts having been made to improve the methodology for constructing flavivirus cDNAs, the cause of toxicity of flavivirus cDNAs in bacteria remains unknown. Here we performed mutational analysis studies to identify\n            <jats:italic>Escherichia coli<\/jats:italic>\n            promoter (ECP) sequences within nucleotides (nt) 1 to 3000 of the dengue virus type 2 (DENV2) and Japanese encephalitis virus (JEV) genomes. Eight and four active ECPs were demonstrated within nt 1 to 3000 of the DENV2 and JEV genomes, respectively, using fusion constructs containing DENV2 or JEV segments and empty vector reporter gene\n            <jats:italic>Renilla<\/jats:italic>\n            luciferase. Full-length DENV2 and JEV cDNAs were obtained by inserting mutations reducing their ECP activity in bacteria without altering amino acid sequences. A severe cytopathic effect occurred when BHK21 cells were transfected with\n            <jats:italic>in vitro<\/jats:italic>\n            -transcribed RNAs from either a DENV2 cDNA clone with multiple silent mutations within the prM-E-NS1 region of dengue genome or a JEV cDNA clone with an A-to-C mutation at nt 90 of the JEV genome. The virions derived from the DENV2 or JEV cDNA clone exhibited infectivities similar to those of their parental viruses in C6\/36 and BHK21 cells. A\n            <jats:italic>cis<\/jats:italic>\n            -acting element essential for virus replication was revealed by introducing silent mutations into the central portion (nt 160 to 243) of the core gene of DENV2 infectious cDNA or a subgenomic DENV2 replicon clone. This novel strategy of constructing DENV2 and JEV infectious clones could be applied to other flaviviruses or pathogenic RNA viruses to facilitate research in virology, viral pathogenesis, and vaccine development.\n          <\/jats:p>","DOI":"10.1128\/jvi.01986-10","type":"journal-article","created":{"date-parts":[[2011,1,13]],"date-time":"2011-01-13T03:48:51Z","timestamp":1294890531000},"page":"2927-2941","update-policy":"https:\/\/doi.org\/10.1128\/asmj-crossmark-policy-page","source":"Crossref","is-referenced-by-count":107,"title":["Successful Propagation of Flavivirus Infectious cDNAs by a Novel Method To Reduce the Cryptic Bacterial Promoter Activity of Virus Genomes"],"prefix":"10.1128","volume":"85","author":[{"given":"Szu-Yuan","family":"Pu","sequence":"first","affiliation":[{"name":"Division of Biotechnology and Pharmaceutical Research, National Health Research Institutes, Miaoli 350, Taiwan, Republic of China"},{"name":"Graduate Institute of Life Sciences, National Defense Medical Center, Taipei, Taiwan, Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ren-Huang","family":"Wu","sequence":"additional","affiliation":[{"name":"Division of Biotechnology and Pharmaceutical Research, National Health Research Institutes, Miaoli 350, Taiwan, Republic of China"},{"name":"Graduate Institute of Life Sciences, National Defense Medical Center, Taipei, Taiwan, Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chi-Chen","family":"Yang","sequence":"additional","affiliation":[{"name":"Division of Biotechnology and Pharmaceutical Research, National Health Research Institutes, Miaoli 350, Taiwan, Republic of China"},{"name":"Graduate Institute of Life Sciences, National Defense Medical Center, Taipei, Taiwan, Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tzu-Ming","family":"Jao","sequence":"additional","affiliation":[{"name":"Division of Biotechnology and Pharmaceutical 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