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Mar 27, 2015
Nature Protocols Add nature.com free-link Cancel
4sUDRB-seq separately measures, on a genomic scale, the distinct contributions of transcription elongation speed and rate of RNA polymerase II (Pol II) transition into active elongation (TAE) to the overall mRNA production rate. It uses reversible inhibition of transcription elongation with 5,6-dichloro-1-β-D-ribofuranosylbenzimidazole (DRB), combined with a pulse of 4-thiouridine (4sU), to tag newly transcribed RNA. After DRB removal, cells are collected at several time points, and tagged RNA is biotinylated, captured on streptavidin beads and sequenced. 4sUDRB-seq enables the comparison of elongation speeds between different developmental stages or different cell types, and it allows the impact of specific transcription factors on transcription elongation speed versus TAE to be studied. RNA preparation takes ∼4 d to complete, with deep sequencing requiring an additional ∼4-11 d plus 1-3 d for bioinformatics analysis. The experimental protocol requires basic molecular biology skills, whereas data analysis requires knowledge in bioinformatics, particularly MATLAB and the Linux environment.

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