A genome‐wide screen identifies IRF2 as a key regulator of caspase‐4 in human cells - Université Claude Bernard Lyon 1 Accéder directement au contenu
Article Dans Une Revue EMBO Reports Année : 2019

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

Omran Allatif

Résumé

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.

Dates et versions

hal-02337614 , version 1 (29-10-2019)

Identifiants

Citer

Sacha Benaoudia, Amandine Martin, Marta Puig Gamez, Gabrielle Gay, Brice Lagrange, et al.. A genome‐wide screen identifies IRF2 as a key regulator of caspase‐4 in human cells. EMBO Reports, 2019, 20 (9), ⟨10.15252/embr.201948235⟩. ⟨hal-02337614⟩
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