Chromatin context shapes SPT5 regulation of promoter-proximal Pol II, fine-tuning gene expression changes during Drosophila embryogenesis.
Transcription involves initiation, pausing, elongation, and termination. Suppressor of Ty5 (SPT5) regulates promoter-proximal pausing and elongation, but how it orchestrates both steps during dynamic developmental changes in gene expression remains unclear. Here, using rapid optogenetic depletion in Drosophila embryos,...