title: [Study of viral specific RNA synthesis in FHM and RTG-2 cells infected with infectious pancreatic necrosis (IPN) virus (author's transl)].
abstract: In FHM and RTG-2 cells infected with IPN virus two types of viral directed RNAs where isolated in the presence of 0.5 mug/ml actinomycin D. One type, sedimenting at 14-15 S in sucrose gradients, was shown to be resistant to digestion by pancreatic RNase and did not precipitate in presence of lithium chloride 2 M. Furthermore the molecules sedimented in the same way as the double stranded RNA extracted from purified virions. The second type of RNA, sedimenting at 23-24 S, was sensitive to RNase and was precipitable by LiCl, indicating that it was single-stranded. Additionally it was shown by polyacrylamide gel electrophoresis that this type of RNA resolved into four peaks. The single stranded 23-24 S RNA was detectable in cells from the third hour following infection; it represents the major portion of total viral directed RNA that was synthesized during a cycle of replication. The synthesis of both single stranded and double stranded RNA increased exponentionally until the 7th hour post-infection and began to decrease at about 10 hours.
mesh_terms: D000818:Animals; D002460:Cell Line; D003530:Cyprinidae; D003609:Dactinomycin / Q000494:pharmacology; D004847:Epithelial Cells; D006066:Gonads; D007700:Kinetics; D012313:RNA / Q000096:biosynthesis; D012367:RNA, Viral / Q000032:analysis / Q000096:biosynthesis*; D012087:Reoviridae / Q000032:analysis / Q000254:growth & development / Q000378:metabolism*; D012487:Salmonidae; D014779:Virus Replication
chemical_list: D012367:RNA, Viral; D003609:Dactinomycin; D012313:RNA
vernacular_title: Etude de la synthèse des ARN viraus dans les cellules FHM et RTG-2 infectées par le virus de la nécrose pancréatique infectieuse (NPI)