Cycling off: a novel mechanism for differential cell cycle-dependent histone gene expression.

Mute prevents histone mRNA accumulation outside of S phase by antagonizing Mxc phosphorylation, revealing a novel cell cycle-dependent regulation mechanism.

• Why it matters: Understanding how histone gene expression is tightly controlled during the cell cycle is vital for maintaining genome integrity and proper DNA packaging, yet the specific regulatory factors involved are not fully known.
• What they did: Geisler and colleagues investigated the repressor Mute, demonstrating that it differentially regulates histone transcript levels by preventing accumulation outside S phase through antagonism of Mxc phosphorylation.
• The result: This work uncovers a new mechanism for cell cycle-dependent histone gene regulation and suggests that factors like Mute can integrate multiple functions to meet the critical needs of histone biosynthesis.