ArticleThe EMBO journal2026
Spalt-related is an inhibitor of mTORC1-mediated growth activated by the integrated stress response.
Article in The EMBO journal, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Anabolic and catabolic processes are coordinated by a conserved regulatory network, which includes the nutrient-sensing protein kinase mTOR complex 1 (mTORC1) and the insulin- and stress-responsive transcription factor FoxO. In a physiological setting, these regulators align growth, storage, reproduction, and aging with nutrient availability. Here, we identify transcription factor Spalt-related (Salr), previously implicated in organogenesis, as a negative regulator of growth and lipid storage in Drosophila melanogaster. Salr activates catabolic gene expression and restricts mTORC1-mediated cell growth in the Drosophila fat body. The genomic binding of Salr overlaps extensively with that of FoxO, and a similar convergence is observed for their mammalian homologs, SALL1 and FOXO1. Both Salr and FoxO are activated upon fasting, but respond to distinct cues: while FoxO displays transient activation and is responsive to AKT inhibition, Salr is activated in a slow and sustained manner through the integrated stress response. Once activated, Salr counters nuclear localization of FoxO. Taken together, we show that Salr and FoxO are growth-inhibitory transcription factors that act in a convergent manner to respond to nutrient stress through distinct cues.
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