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Pluripotent stem cell activity is essential to maintain regeneration and homeostasis in the Drosophila midgut following environmental challenges. Although multiple pathways have been implicated in epithelial renewal, the underlying regulatory mechanisms and correlations between relevant genes and pathways remain elusive. In this study, we show that the zinc finger protein CG12744 plays an important role in the differentiation and regeneration of epithelial cells in response to oral infection with Erwinia carotovora carotovora 15. Knocking down CG12744 in enteroblasts decreased the post-infection proportion of enteroblasts and enterocytes and increased the post-infection number of enteroendocrine cells. In addition, in precursors, CG12744 affected the Osa, jun-N-terminal kinase and bone morphogenetic protein signaling pathways to control enterocyte differentiation. Finally, CG12744 maintained epithelial architecture and cell fate in enterocytes following an acute infectious challenge.CG12744 promotes EC differentiation by regulating Osa and JNK levels after infection.CG12744 suppresses EE differentiation after infection.CG12744 regulates the maintenance of epithelial architecture after infection.