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Alliance"],"published-print":{"date-parts":[[2023,6]]},"abstract":"<jats:p>The IFN system constitutes a powerful antiviral defense machinery. Consequently, effective IFN responses protect against severe COVID-19 and exogenous IFNs inhibit SARS-CoV-2 in vitro. However, emerging SARS-CoV-2 variants of concern (VOCs) may have evolved reduced IFN sensitivity. Here, we determined differences in replication and IFN susceptibility of an early SARS-CoV-2 isolate (NL-02-2020) and the Alpha, Beta, Gamma, Delta, and Omicron VOCs in Calu-3 cells, iPSC-derived alveolar type-II cells (iAT2) and air\u2013liquid interface (ALI) cultures of primary human airway epithelial cells. Our data show that Alpha, Beta, and Gamma replicated to similar levels as NL-02-2020. In comparison, Delta consistently yielded higher viral RNA levels, whereas Omicron was attenuated. All viruses were inhibited by type-I, -II, and -III IFNs, albeit to varying extend. Overall, Alpha was slightly less sensitive to IFNs than NL-02-2020, whereas Beta, Gamma, and Delta remained fully sensitive. Strikingly, Omicron BA.1 was least restricted by exogenous IFNs in all cell models. Our results suggest that enhanced innate immune evasion rather than higher replication capacity contributed to the effective spread of Omicron BA.1.<\/jats:p>","DOI":"10.26508\/lsa.202201745","type":"journal-article","created":{"date-parts":[[2023,3,28]],"date-time":"2023-03-28T15:30:37Z","timestamp":1680017437000},"page":"e202201745","update-policy":"https:\/\/doi.org\/10.26508\/lsa.crossmarkpolicy","source":"Crossref","is-referenced-by-count":32,"title":["Reduced replication but increased interferon resistance of SARS-CoV-2 Omicron BA.1"],"prefix":"10.26508","volume":"6","author":[{"given":"Rayhane","family":"Nchioua","sequence":"first","affiliation":[{"name":"Institute of Molecular Virology, Ulm University Medical Center, Ulm, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Annika","family":"Schundner","sequence":"additional","affiliation":[{"name":"Institute of General Physiology, Ulm University Medical Center, Ulm, 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