In eukaryotes, the nuclear envelope breaks the physical connection between transcription and translation observed in prokaryotes. The nuclear envelope also creates a time and a space for RNA processing, impacting mRNA localization, translation, and decay. During transcription, pre-mRNA undergoes capping, splicing, cleavage, and polyadenylation in the nucleus before being exported to the cytoplasm where it will be translated, stored or degraded. The regulation of RNA processing shapes genetic information and, therefore, gene expression. Altered RNA metabolism has been linked to human inherited diseases and cancers. RNA therapeutics, including mRNA vaccines, siRNA, antisense oligonucleotides, and small molecules, aim to restore physiological RNA processing and gene expression patterns. Our research group aims to investigate the fundamental basis of RNA therapeutics acting on nuclear RNA processing and develop this field of medicinal chemistry.