Gut barrier defects, intestinal immune hyperactivation and enhanced lipid catabolism drive lethality in NGLY1-deficient Drosophila

Ashutosh Pandey (), Antonio Galeone, Seung Yeop Han, Benjamin A. Story, Gaia Consonni, William F. Mueller, Lars M. Steinmetz, Thomas Vaccari and Hamed Jafar-Nejad ()
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Ashutosh Pandey: Baylor College of Medicine
Antonio Galeone: University of Milan
Seung Yeop Han: Baylor College of Medicine
Benjamin A. Story: European Molecular Biology Laboratory (EMBL)
Gaia Consonni: University of Milan
William F. Mueller: European Molecular Biology Laboratory (EMBL)
Lars M. Steinmetz: European Molecular Biology Laboratory (EMBL)
Thomas Vaccari: University of Milan
Hamed Jafar-Nejad: Baylor College of Medicine

Nature Communications, 2023, vol. 14, issue 1, 1-16

Abstract: Abstract Intestinal barrier dysfunction leads to inflammation and associated metabolic changes. However, the relative impact of gut bacteria versus non-bacterial insults on animal health in the context of barrier dysfunction is not well understood. Here, we establish that loss of Drosophila N-glycanase 1 (Pngl) in a specific intestinal cell type leads to gut barrier defects, causing starvation and JNK overactivation. These abnormalities, along with loss of Pngl in enterocytes and fat body, result in Foxo overactivation, leading to hyperactive innate immune response and lipid catabolism and thereby contributing to lethality. Germ-free rearing of Pngl mutants rescued their developmental delay but not lethality. However, raising Pngl mutants on isocaloric, fat-rich diets partially rescued lethality. Our data indicate that Pngl functions in Drosophila larvae to establish the gut barrier, and that the lethality caused by loss of Pngl is primarily mediated through non-bacterial induction of immune and metabolic abnormalities.

Date: 2023
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DOI: 10.1038/s41467-023-40910-w

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