Cellular adaptations of fission yeast to inositol starvation.

Inositol starvation causes G2 arrest and widespread metabolic and transcriptomic changes in S. pombe, including a 2-3 division growth halt and lipid metabolism shifts.

• Why it matters: Understanding cellular responses to inositol deficiency is crucial because inositol is vital for cell signaling, metabolism, and phosphate homeostasis, yet its deprivation mechanisms are not fully known.
• What they did: The study used genome-wide mRNA analysis and metabolite tracking in S. pombe, an obligate inositol auxotroph, to identify specific adaptive responses to inositol starvation.
• The result: Findings reveal that inositol deprivation triggers lipid accumulation, alters inositol polyphosphate levels, activates autophagy, and remodels the transcriptome, providing insights into nutrient stress adaptation.