Identification of a KCNE2 Gain-of-Function Mutation in Patients with Familial Atrial Fibrillation Yiqing Yang, Min Xia, Qingfeng Jin, Saïd Bendahhou,

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Identification of a KCNE2 Gain-of-Function Mutation in Patients with Familial Atrial Fibrillation Yiqing Yang, Min Xia, Qingfeng Jin, Saïd Bendahhou, Jingyi Shi, Yiping Chen, Bo Liang, Jie Lin, Yi Liu, Ban Liu, Qinshu Zhou, Dongwei Zhang, Rong Wang, Ning Ma, Xiaoyan Su, Kaiya Niu, Yan Pei, Wenyuan Xu, Zhaopeng Chen, Haiying Wan, Jianmin Cui, Jacques Barhanin, Yihan Chen The American Journal of Human Genetics Volume 75, Issue 5, Pages 899-905 (November 2004) DOI: 10.1086/425342 Copyright © 2004 The American Society of Human Genetics Terms and Conditions

Figure 1 KCNE2 R27C mutation associated with AF. A, Pedigrees of families 1 and 2. Squares indicate male family members; circles, female family members; symbols with a slash, members who had died; blackened symbols, affected members; unblackened symbols, unaffected members; and arrows, probands. Asterisks indicate mutation carriers who had premature atrial complexes. II-1 and II-5 in family 1 and II-3 and II-6 in family 2 had apparent recurrent palpitation. B, Standard 12-lead electrocardiogram of an affected member (II-1 in family 2). C, Sequence analysis of DNA from the affected family members, after PCR amplification revealed a C→T substitution at nucleotide 79 in KCNE2 causing an R27C mutation in families 1 and 2. The American Journal of Human Genetics 2004 75, 899-905DOI: (10.1086/425342) Copyright © 2004 The American Society of Human Genetics Terms and Conditions

Figure 2 Gain-of-function effect of the KCNE2 R27C mutation. A–C, Representative whole-cell current traces. These were recorded from COS-7 cells transfected with KCNQ1 alone (A), cells cotransfected with KCNQ1 and KCNE2 (B), and cells cotransfected with KCNQ1 and KCNE2 R27C (C). D, Plot of current density versus voltage for cotransfection of KCNQ1 and KCNE2 (▴) (n = 30) or for cotransfection of KCNQ1 and KCNE2 R27C (▪) (n=26) at room temperature. E, Comparison of current density at −110 mV (inward current) and +30 mV (outward current) at room temperature. Q1-T8A represents cells cotransfected with KCNQ1 and KCNE2 T8A (n=15); Q1-Q9E, cells cotransfected with KCNQ1 and KCNE2 Q9E (n=14); Q1-E2, cells cotransfected with KCNQ1 and KCNE2 (n=30); and Q1-R27C, cells cotransfected with KCNQ1 and KCNE2 R27C (n=26). Cells were held at −80 mV before depolarization to various test potentials from −120 mV to +60 mV in 10-mV increments for 2,000 ms and then were held at −40 mV for 500 ms. The American Journal of Human Genetics 2004 75, 899-905DOI: (10.1086/425342) Copyright © 2004 The American Society of Human Genetics Terms and Conditions