Histone succinylation by NCOA1/2/3 drives mediator association and transcription.

NCOA1/2/3 function as histone succinyltransferases that drive Mediator complex promoter association and global transcriptional activation in mammalian cells.

• Why it matters: Histone succinylation’s mechanism and how it regulates transcription were unclear, limiting understanding of how this conserved lysine modification is interpreted at promoters.
• What they did: The study identified NCOA1-NCOA3 as HSTs for bulk histone succinylation, showed they form phase-separation condensates via HST activity, and used binding assays plus epigenome profiling to link succinylated histone tails to Mediator.
• The result: NCOA1/2/3-catalyzed succinylation is enriched at gene promoters and is essential for Mediator promoter association, supporting a role for succinylation in global transcription in cancer and embryonic stem cells.

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