Spatial transcriptomics unveils the in situ cellular and molecular hallmarks of the lung in fatal COVID-19.

Spatial transcriptomics reveals that fatal COVID-19 lung damage involves a progressive loss of endothelial cells, pneumocytes type I, and natural killer cells, with increased myeloid and stromal cells.

• Why it matters: Understanding cellular and molecular changes in lethal COVID-19 is crucial for developing targeted therapies and improving patient outcomes, as current knowledge of these processes remains limited.
• What they did: The study used Visium spatial transcriptomics on COVID-19 and control lung samples to analyze cell types, spatial organization, ligand-receptor interactions, transcription factor activity, and signaling pathways across disease stages.
• The result: Findings highlight the TGF-β pathway as a key driver of diffuse alveolar damage, identify potential therapeutic targets in fibroblast signaling, and characterize alveolar epithelium regeneration, advancing insights into COVID-19 lung pathology.