Genomics & Informatics

Korea Genome Organization (한국유전체학회)
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Validation and genetic heritability estimation of known type 2 diabetes related variants in the Korean population

  • Jang, Hye-Mi (Division of Genome Science, Department of Precision Medicine, National Institute of Health) ;
  • Hwang, Mi Yeong (Division of Genome Science, Department of Precision Medicine, National Institute of Health) ;
  • Kim, Bong-Jo (Division of Genome Science, Department of Precision Medicine, National Institute of Health) ;
  • Kim, Young Jin (Division of Genome Science, Department of Precision Medicine, National Institute of Health)
  • Received : 2021.11.22
  • Accepted : 2021.12.14
  • Published : 2021.12.31
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Abstract

Genome-wide association studies (GWASs) facilitated the discovery of countless disease-associated variants. However, GWASs have mostly been conducted in European ancestry samples. Recent studies have reported that these European-based association results may reduce disease prediction accuracy when applied in non-Europeans. Therefore, previously reported variants should be validated in non-European populations to establish reliable scientific evidence for precision medicine. In this study, we validated known associations with type 2 diabetes (T2D) and related metabolic traits in 125,850 samples from a Korean population genotyped by the Korea Biobank Array (KBA). At the end of December 2020, there were 8,823 variants associated with glycemic traits, lipids, liver enzymes, and T2D in the GWAS catalog. Considering the availability of imputed datasets in the KBA genome data, publicly available East Asian T2D summary statistics, and the linkage disequilibrium among the variants (r2 < 0.2), 2,900 independent variants were selected for further analysis. Among these, 1,837 variants (63.3%) were statistically significant (p ≤ 0.05). Most of the non-replicated variants (n = 1,063) showed insufficient statistical power and decreased minor allele frequencies compared with the replicated variants. Moreover, most of known variants showed <10% genetic heritability. These results could provide valuable scientific evidence for future study designs, the current power of GWASs, and future applications in precision medicine in the Korean population.

Keywords

Acknowledgement

This work was supported by intramural grants from the National Institute of Health, Republic of Korea (2019-NI-097-02). Genotype data were provided by the Collaborative Genome Program for Fostering New Post-Genome Industry (3000-3031b).

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