The SPOC proteins DIDO3 and PHF3 co-regulate gene expression and neuronal differentiation - 3' RNA-seq
Transcription is regulated by a multitude of activators and repressors, which bind to the RNA polymerase II (Pol II) machinery and modulate its progression. Death-inducer obliterator (DIDO) and PHD finger protein 3 (PHF3) are paralogue proteins that regulate transcription elongation by docking onto phosphorylated serine-2 in the C-terminal domain (CTD) of Pol II through their SPOC domains. Here we show that DIDO3 and PHF3 form a complex that bridges the Pol II elongation machinery with chromatin and RNA processing factors, and tethers Pol II in a phase-separated microenvironment. Their SPOC domains and C-terminal intrinsically disordered regions are critical for transcription regulation. The dataset contains 3' Sequencing of WT, PHF3 KO, and PHF3 dSPOC mutant HEK293 cell line. Cytoplasmic and nuclear fractions were profiled separately.