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Abstract

Recombinant Newcastle disease virus (rNDV) strains engineered to express foreign genes from an additional transcription unit (ATU) are considered as candidate live-attenuated vector vaccines for human and veterinary use. Early during the COVID-19 pandemic we and others generated COVID-19 vaccine candidates based on rNDV expressing a partial or complete SARS-CoV-2 spike (S) protein. In our studies, a number of the rNDV constructs did not show high S expression levels in cell culture or seroconversion in immunized hamsters. Sanger sequencing showed the presence of frequent A-to-G transitions characteristic of adenosine deaminase acting on RNA (ADAR). Subsequent whole genome rNDV sequencing revealed that this biased hypermutation was exclusively localized in the ATU expressing the spike gene, and was related to deamination of adenosines in the negative strand viral genome RNA. The biased hypermutation was found both after virus rescue in chicken cell line DF-1 followed by passaging in embryonated chicken eggs, and after direct virus rescue and subsequent passaging in Vero E6 cells. Levels of biased hypermutation were higher in constructs containing codon-optimized as compared to native S gene sequences, suggesting potential association with increased GC content. These data show that deep sequencing of candidate recombinant vector vaccine constructs in different phases of development is of crucial importance in the development of NDV-based vaccines.

  • This is an open-access article distributed under the terms of the Creative Commons Attribution License. This article was made open access via a Publish and Read agreement between the Microbiology Society and the corresponding author’s institution.
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2023-05-15
2024-05-05
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