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10.1099/jgv.0.001474

http://scihub22266oqcxt.onion/10.1099/jgv.0.001474
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32720890!7660457!32720890
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suck abstract from ncbi


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pmid32720890      J+Gen+Virol 2020 ; 101 (10): 1103-1118
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  • Multiple novel non-canonically transcribed sub-genomic mRNAs produced by avian coronavirus infectious bronchitis virus #MMPMID32720890
  • Keep S; Oade MS; Lidzbarski-Silvestre F; Bentley K; Stevenson-Leggett P; Freimanis GL; Tennakoon C; Sanderson N; Hammond JA; Jones RC; Britton P; Bickerton E
  • J Gen Virol 2020[Oct]; 101 (10): 1103-1118 PMID32720890show ga
  • Coronavirus sub-genomic mRNA (sgmRNA) synthesis occurs via a process of discontinuous transcription involving complementary transcription regulatory sequences (TRSs), one (TRS-L) encompassing the leader sequence of the 5' untranslated region (UTR), and the other upstream of each structural and accessory gene (TRS-B). Several coronaviruses have an ORF located between the N gene and the 3'-UTR, an area previously thought to be non-coding in the Gammacoronavirus infectious bronchitis virus (IBV) due to a lack of a canonical TRS-B. Here, we identify a non-canonical TRS-B allowing for a novel sgmRNA relating to this ORF to be produced in several strains of IBV: Beaudette, CR88, H120, D1466, Italy-02 and QX. Interestingly, the potential protein produced by this ORF is prematurely truncated in the Beaudette strain. A single nucleotide deletion was made in the Beaudette strain allowing for the generation of a recombinant IBV (rIBV) that had the potential to express a full-length protein. Assessment of this rIBV in vitro demonstrated that restoration of the full-length potential protein had no effect on viral replication. Further assessment of the Beaudette-derived RNA identified a second non-canonically transcribed sgmRNA located within gene 2. Deep sequencing analysis of allantoic fluid from Beaudette-infected embryonated eggs confirmed the presence of both the newly identified non-canonically transcribed sgmRNAs and highlighted the potential for further yet unidentified sgmRNAs. This HiSeq data, alongside the confirmation of non-canonically transcribed sgmRNAs, indicates the potential of the coronavirus genome to encode a larger repertoire of genes than has currently been identified.
  • |5' Untranslated Regions/genetics[MESH]
  • |Animals[MESH]
  • |Base Sequence[MESH]
  • |Cell Line[MESH]
  • |Chickens[MESH]
  • |Chlorocebus aethiops[MESH]
  • |Coronavirus Infections/veterinary/virology[MESH]
  • |Infectious bronchitis virus/*genetics[MESH]
  • |Open Reading Frames/genetics[MESH]
  • |Poultry Diseases/virology[MESH]
  • |RNA, Messenger/*genetics[MESH]
  • |RNA, Viral/*genetics[MESH]
  • |Regulatory Sequences, Nucleic Acid/*genetics[MESH]
  • |Transcription, Genetic/*genetics[MESH]
  • |Vero Cells[MESH]
  • |Viral Proteins/genetics/metabolism[MESH]


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