Genomic DNA was extracted from the iPSCs and exons corresponding to the coding region of KCNH2 were amplified as previously published26. To amplify exon 7 of KCNH2, the PCRx Enhancer Reagent (Thermo Scientific) was added to the reaction, according to the manufacturer’s instructions. PCR products were purified by ExoSAP-IT PCR Product Cleanup Reagent (Affymetrix) and sequenced using sense or antisense primers, according to manufacturer’s instructions (primer sequences are available in Supplementary Table 1) in 3500-xL Genetic Analyzer with BigDye terminator v3.1 Cycle Sequencing Kit (Thermo Scientific).
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