Max von Pettenkofer Institute, LMU 1 article published in JoVE Biology Metabolic Labeling of Newly Transcribed RNA for High Resolution Gene Expression Profiling of RNA Synthesis, Processing and Decay in Cell Culture Bernd Rädle*1, Andrzej J. Rutkowski*2, Zsolt Ruzsics1, Caroline C. Friedel3, Ulrich H. Koszinowski1, Lars Dölken2 1Max von Pettenkofer Institute, 2Department of Medicine, University of Cambridge, 3Institute for Informatics, Ludwig-Maximilians-University Munich Total cellular RNA provides a poor template for studying short-term changes in RNA synthesis and decay as well as the kinetics of RNA processing. Here, we describe metabolic labeling of newly transcribed RNA with 4-thiouridine followed by thiol-specific biotinylation and purification of newly transcribed RNA allowing to overcome these limitations.