RNAi Screening for Ubiquitin Ligases that Regulate Myofiber Size Identifies a Key Role for UBR4 in Myofiber Hypertrophy in Drosophila and Mice

Sequencing of RNA isolated from the tibialis anterior muscles of 6 month old C57BL/6J mice that had been injected and electroporated with either a control non-targeting siRNA (NT) or two different UBR4 targeting siRNA sequences (UBR4 siRNA5 and siRNA7) to deplete UBR4. Muscles were harvested 7 days after electroporation and showed significant loss of UBR4 coincident with hypertrophy of type 2A and 2X myofibers. Overall design: 3 samples each of non targeting control and 2 siRNA UBR4 targeting constructs.