Common and rare susceptibility genetic variants predisposing to Brugada syndrome in Thailand.

Abstract:

BACKGROUND:Mutations in SCN5A are rarely found in Thai patients with Brugada syndrome (BrS). Recent evidence suggested that common genetic variations may underlie BrS in a complex inheritance model. OBJECTIVE:The purpose of this study was to find common and rare/low-frequency genetic variants predisposing to BrS in persons in Thailand. METHODS:We conducted a genome-wide association study (GWAS) to explore the association of common variants in 154 Thai BrS cases and 432 controls. We sequenced SCN5A in 131 cases and 205 controls. Variants were classified according to current guidelines, and case-control association testing was performed for rare and low-frequency variants. RESULTS:Two loci were significantly associated with BrS. The first was near SCN5A/SCN10A (lead marker rs10428132; odds ratio [OR] 2.4; P = 3 × 10-10). Conditional analysis identified a novel independent signal in the same locus (rs6767797; OR 2.3; P = 2.7 × 10-10). The second locus was near HEY2 (lead marker rs3734634; OR 2.5; P = 7 × 10-9). Rare (minor allele frequency [MAF] <0.0001) coding variants in SCN5A were found in 8 of the 131 cases (6.1% in cases vs 2.0% in controls; P = .046; OR 3.3; 95% confident interval [CI] 1.0-11.1), but an enrichment of low-frequency (MAF<0.001 and >0.0001) variants also was observed in cases, with 1 variant (SCN5A: p.Arg965Cys) detected in 4.6% of Thai BrS patients vs 0.5% in controls (P = 0.015; OR 9.8; 95% CI 1.2-82.3). CONCLUSION:The genetic basis of BrS in Thailand includes a wide spectrum of variant frequencies and effect sizes. As previously shown in European and Japanese populations, common variants near SCN5A and HEY2 are associated with BrS in the Thai population, confirming the transethnic transferability of these 2 major BrS loci.

journal_name

Heart Rhythm

journal_title

Heart rhythm

authors

Makarawate P,Glinge C,Khongphatthanayothin A,Walsh R,Mauleekoonphairoj J,Amnueypol M,Prechawat S,Wongcharoen W,Krittayaphong R,Anannab A,Lichtner P,Meitinger T,Tjong FVY,Lieve KVV,Amin AS,Sahasatas D,Ngarmukos T,Wichada

doi

10.1016/j.hrthm.2020.06.027

subject

Has Abstract

pub_date

2020-12-01 00:00:00

pages

2145-2153

issue

12

eissn

1547-5271

issn

1556-3871

pii

S1547-5271(20)30626-3

journal_volume

17

pub_type

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