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A genome‐wide screen identifies IRF2 as a key regulator of caspase‐4 in human cells

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Benaoudia, Sacha | Martin, Amandine | Puig Gamez, Marta | Gay, Gabrielle | Lagrange, Brice | Cornut, Maxence | Krasnykov, Kyrylo | Claude, Jean‐baptiste | Bourgeois, Cyril | Hughes, Sandrine | Gillet, Benjamin | Allatif, Omran | Corbin, Antoine | Ricci, Romeo | Henry, Thomas

Edité par CCSD ; EMBO Press -

International audience. Caspase‐4, the cytosolic LPS sensor, and gasdermin D, its downstream effector, constitute the non‐canonical inflammasome, which drives inflammatory responses during Gram‐negative bacterial infections. It remains unclear whether other proteins regulate cytosolic LPS sensing, particularly in human cells. Here, we conduct a genome‐wide CRISPR/Cas9 screen in a human monocyte cell line to identify genes controlling cytosolic LPS‐mediated pyroptosis. We find that the transcription factor, IRF2, is required for pyroptosis following cytosolic LPS delivery and functions by directly regulating caspase‐4 levels in human monocytes and iPSC‐derived monocytes. CASP4, GSDMD, and IRF2 are the only genes identified with high significance in this screen highlighting the simplicity of the non‐canonical inflammasome. Upon IFN‐γ priming, IRF1 induction compensates IRF2 deficiency, leading to robust caspase‐4 expression. Deficiency in IRF2 results in dampened inflammasome responses upon infection with Gram‐negative bacteria. This study emphasizes the central role of IRF family members as specific regulators of the non‐canonical inflammasome.

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