Figure 7.
1b-R25W is arrhythmogenic in iPSC-CMs. 50 sequential AP traces paced at 1 Hz recorded from iPSC-CMs transfected with either pcDNA3.1 (Vector, A) or 1b-R25W (B) at 36 ± 1°C. (C) Time to 90% repolarization (APD90) recorded from vector-transfected (gray) or R25W-transfected (green) iPSC-CMs (n = 25 & 13, respectively). (D) Ratio of Phase 2 to Phase 3 repolarization times reported as (APD40-APD30)/(APD80-APD70) for either vector-transfected (gray) or 1b-R25W-transfected (green) iPSC-CMs (n = 25 & 13, respectively). (E) Mean coefficient of variation measured from 50 sequential APs paced at 1 Hz from either vector-transfected (gray) or 1b-R25W-transfected (green) iPSC-CMs (n = 22 & 12, respectively). * indicates statistical significance compared to control at p < 0.05. ** indicates statistical significance compared to control at p < 0.01.