ReviewBiochemical Society transactions2026
Communication is key: combinatorial phosphorylation and functional cross-talk in the RNA polymerase II CTD code.
Review in Biochemical Society transactions, 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
The C-terminal domain (CTD) of the largest subunit of RNA polymerase II serves as a dynamic platform coordinating transcription and RNA processing. Recent advances in mass spectrometry, structural biology, and sequencing approaches have revealed a far more complex, combinatorial CTD code than previously appreciated. The present review examines the CTD as an integrative signaling hub that translates diverse environmental signals into genomic outputs. We explore the hierarchical transitions between phosphorylation states, highlighting how combinatorial marks rather than isolated modifications shape transcriptional progression and prevent cryptic initiation through cross-talk with the histone code. Special focus is given to the roles of 'enigmatic' marks such as pTyr1 and pThr4, whose functional significance has been complicated by biochemical masking effects and species-specific regulatory nodes. We also discuss emerging evidence that CTD remodeling contributes to stress-responsive transcription, including oxidative stress, heat shock, and DNA damage. Together, these observations support a dynamic model of the CTD in which combinatorial phosphorylation states coordinate transcriptional progression, genome stability, and stress-responsive gene regulation.
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