title: Defective interfering particles of human parainfluenza virus 3.
abstract: A cyclic pattern of virus production was observed when human parainfluenza virus 3 (HPIV3) was serially passaged nine times in LLC-MK2 cells. Viruses produced from serial passages 8 and 9 interfered with the replication of standard HPIV3. Three subgenomic RNA species (DI-1, DI-2, and DI-3) and virus genomic RNA were detected in the progeny virions produced from cells mixedly infected with standard virus and virus from either serial passages 5 or 8. Northern blot analysis with probes representing all six HPIV3 structural protein genes revealed that DI-1 and DI-2 RNAs contain sequences from the 5' end of the standard virus genome. DI-1 RNA contains L, HN, and F specific sequences, while DI-2 RNA contains only L and HN sequences. DI-3 RNA did not hybridize with any of the probes used. The possibility that DI-3 RNA contains sequences from the 5' end of the standard virus genome is discussed. These results demonstrate that 5' defective interfering particles are generated during serial passage of HPIV3.
mesh_terms: D003673:Defective Viruses / Q000235:genetics / Q000502:physiology*; D005814:Genes, Viral; D010224:Parainfluenza Virus 3, Human / Q000235:genetics / Q000502:physiology*; D012333:RNA, Messenger / Q000235:genetics; D012367:RNA, Viral / Q000235:genetics; D018108:Respirovirus / Q000502:physiology*; D014764:Viral Proteins / Q000096:biosynthesis / Q000235:genetics; D014779:Virus Replication
chemical_list: D012333:RNA, Messenger; D012367:RNA, Viral; D014764:Viral Proteins