A TORC1-regulated H3K4me reader preserves promoter chromatin stability, and its degradation promotes meiotic remodeling.

In fission yeast, coordinated Jmj3 and Lid2 limit H3K4me-dependent NuA4 engagement to preserve promoter chromatin stability by preventing excessive H4 acetylation and NSFP destabilization.

• Why it matters: Active promoters are marked by H3K4me, but how cells prevent inappropriate remodeling of this chromatin state is unclear, especially during nutrient-driven transitions.
• What they did: The study used fission yeast genetics to show jmj3 and lid2 preserve promoter stability by restricting NuA4 chromatin engagement, and tested how TORC1 inactivation triggers Ubc14-Dbl4-dependent degradation of Jmj3 and Lid2.
• The result: Reduced NuA4 limits H4 acetylation, SWI/SNF remodeling, and NSFP destabilization to maintain vegetative transcription, while Jmj3/Lid2 loss couples meiotic transcriptional reprogramming with Rec12-dependent recombination hotspot activation.

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