Key result
In Taiwanese patients, the cumulative risk of Brugada syndrome-related SNPs significantly increased disease susceptibility (OR 3.54 for 5 risk alleles vs 1; P=1.38×10^-9).
Why the study?
Several Brugada syndrome or ECG trait-related SNPs were identified in White patients, but validation in Taiwanese patients and assessment of polygenic risk scores for predicting cardiac events were needed.
Do previously reported genome-wide genetic variants predict Brugada syndrome susceptibility and cardiac events in a Taiwanese population?
Case-Control (n=190)
Do previously reported genome-wide genetic variants predict Brugada syndrome susceptibility and cardiac events in a Taiwanese population?
Odds Ratio: 3.54
p-value: p=1.38×10^-9
Previously reported SNPs associated with Brugada syndrome in white populations are validated in a Taiwanese cohort and correlate with clinical outcomes and the absence of SCN5A mutations.
May support PRS for BrS event prediction in East Asians; extends European GWAS findings but leaves clinical use open.
Background: Brugada syndrome (BrS) is an oligogenic arrhythmic disease with increased risk of sudden cardiac arrest. Several BrS or ECG traits-related single-nucleotide polymorphisms (SNPs) were identified through previous genome-wide association studies in white patients. We aimed to validate these SNPs in BrS patients in the Taiwanese population, assessing the cumulative effect of risk alleles and the BrS-polygenic risk score in predicting cardiac events. Methods: We genotyped 190 unrelated BrS patients using the TWB Array, and Taiwan Biobank was used as controls. SNPs not included in the array were imputed by IMPUTE2. Cox proportional hazards model was used to evaluate the associations between each particular SNP, the collective BrS-polygenic risk score, and clinical outcomes. Results: Of the 88 previously reported SNPs, 22 were validated in Taiwanese BrS patients ( P <0.05). Of the 22 SNPs, 2 (rs10428132 and rs9388451) were linked with susceptibility to BrS, 10 were SNPs previously reaching genome-wide significance, and 10 were SNPs associated with ECG traits. For the 3 most commonly reported SNPs, disease risk increased consistently with the number of risk alleles (odds ratio, 3.54; P trend =1.38×10 −9 for 5 risk alleles versus 1). Similar patterns were observed in both SCN5A mutation+ (odds ratio, 3.66; P trend =0.049) and SCN5A mutation− (odds ratio, 3.75; P trend =8.54×10 −9 ) subgroups. Furthermore, BrS patients without SCN5A mutations had more risk alleles than BrS patients with SCN5A mutations regardless of the range of polygenic risk scores. Three SNPs (rs4687718, rs7784776, and rs2968863) showed significant associations with the composite outcome (sudden cardiac arrest plus syncope, hazard ratio, 2.13, 1.48, and 0.41; P =0.02, 0.006, and 0.008, respectively). Conclusions: Our findings suggested that some SNPs associated with BrS or ECG traits exist across multiple populations. The cumulative risk of the BrS-related SNPs is similar to that in white BrS patients, but it appears to correlate with the absence of SCN5A mutations.
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Juang et al. (2020) conducted a case-control in Brugada syndrome (n=190). Brugada syndrome-related single-nucleotide polymorphisms (SNPs) vs. Fewer risk alleles / Taiwan Biobank controls was evaluated on Disease risk (Brugada syndrome susceptibility) for 5 risk alleles versus 1 (OR 3.54, p=1.38×10^-9). In Taiwanese patients, the cumulative risk of Brugada syndrome-related SNPs significantly increased disease susceptibility (OR 3.54 for 5 risk alleles vs 1; P=1.38×10^-9).
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