SARS-CoV-2 Delta variant-specific ORF3a mutations destabilize lysosomal homeostasis to trigger lysosomal damage-mediated cell death.

Delta variant-specific ORF3a mutations destabilize lysosomal homeostasis, causing lysosomal damage that triggers inflammatory cell death in SARS-CoV-2.

• Why it matters: Understanding the mechanisms behind the Delta variant's heightened pathogenicity is crucial for developing targeted treatments and managing COVID-19 severity, as current knowledge about variant-specific effects remains limited.
• What they did: Researchers analyzed the genetic variations of SARS-CoV-2 VOCs, focusing on ORF3a mutations, and found that Delta-specific mutations promote lysosomal damage and cell death without affecting viral titers.
• The result: These findings reveal that Delta-specific ORF3a mutations facilitate lysosomal disruption and inflammatory cell death, providing insights into the variant’s increased pathogenicity and potential therapeutic targets.