Viral replication and host response in airway epithelial cells predicts coronavirus pathogenicity and identifies HCoV-229E as an atypical seasonal coronavirus

HCoV-229E is linked to pronounced epithelial injury, cilia loss, and strong interferon-stimulated gene expression in airway epithelial cultures despite only modest replication.

• Why it matters: Determinants that separate pathogenic coronaviruses from seasonal strains are not well defined, limiting evaluation of emergent viruses for pandemic preparedness.
• What they did: The study systematically compared replication, cellular tropism, innate responses, and cytopathogenicity of pathogenic versus seasonal HCoVs across nasal, bronchial, small airway, and embryonic stem cell–derived AT2 epithelial cultures.
• The result: Only pathogenic HCoVs replicated to high titres in AT2 cells and suppressed key innate immune signatures, while seasonal strains showed limited alveolar replication; HCoV-229E uniquely triggered stress/death programmes resembling those induced by MERS-CoV.

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