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10.1016/j.celrep.2021.109197

http://scihub22266oqcxt.onion/10.1016/j.celrep.2021.109197
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suck abstract from ncbi


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pmid34043946      Cell+Rep 2021 ; 35 (9): 109197
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  • SARS-CoV-2 genomic surveillance identifies naturally occurring truncation of ORF7a that limits immune suppression #MMPMID34043946
  • Nemudryi A; Nemudraia A; Wiegand T; Nichols J; Snyder DT; Hedges JF; Cicha C; Lee H; Vanderwood KK; Bimczok D; Jutila MA; Wiedenheft B
  • Cell Rep 2021[Jun]; 35 (9): 109197 PMID34043946show ga
  • Over 950,000 whole-genome sequences of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) have been determined for viruses isolated from around the world. These sequences are critical for understanding the spread and evolution of SARS-CoV-2. Using global phylogenomics, we show that mutations frequently occur in the C-terminal end of ORF7a. We isolate one of these mutant viruses from a patient sample and use viral challenge experiments to link this isolate (ORF7a(Delta115)) to a growth defect. ORF7a is implicated in immune modulation, and we show that the C-terminal truncation negates anti-immune activities of the protein, which results in elevated type I interferon response to the viral infection. Collectively, this work indicates that ORF7a mutations occur frequently, and that these changes affect viral mechanisms responsible for suppressing the immune response.
  • |*Immunity[MESH]
  • |Animals[MESH]
  • |COVID-19/*immunology/*virology[MESH]
  • |Chlorocebus aethiops[MESH]
  • |Genome, Viral[MESH]
  • |HEK293 Cells[MESH]
  • |Humans[MESH]
  • |Interferon Type I/immunology[MESH]
  • |Mutation[MESH]
  • |Phylogeny[MESH]
  • |SARS-CoV-2/*genetics/pathogenicity[MESH]
  • |Vero Cells[MESH]
  • |Viral Proteins/*genetics/*immunology[MESH]


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