Abstract
Alcohol dependence (AD) is a multifactorial and polygenic disorder involving complex gene-to-gene and gene-to-environment interactions. Several genome-wide association studies have reported numerous risk factors for AD, but replication results following these studies have been controversial. To identify new candidate genes, the present study used GWAS and replication studies in a Korean cohort with AD. Genome-wide association analysis revealed that two chromosome regions on Chr. 4q22-q23 (ADH gene cluster, including ADH5, ADH4, ADH6, ADH1A, ADH1B, and ADH7) and Chr. 12q24 (ALDH2) showed multiple association signals for the risk of AD. To investigate detailed genetic effects of these ADH genes on AD, a follow-up study of the ADH gene cluster on 4q22-q23 was performed. A total of 90 SNPs, including ADH1B rs1229984 (H47R), were genotyped in an additional 975 Korean subjects. In case–control analysis, ADH1B rs1229984 (H47R) showed the most significant association with the risk of AD (p = 2.63 × 10−21, OR = 2.35). Moreover, subsequent conditional analyses revealed that all positive associations of other ADH genes in the cluster disappeared, which suggested that ADH1B rs1229984 (H47R) might be the sole functional genetic marker across the ADH gene cluster. Our findings could provide additional information on the ADH gene cluster regarding the risk of AD, as well as a new and important insight into the genetic factors associated with AD.
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Acknowledgments
This study was supported by a grant from the Korea Healthcare Technology R&D Project, Ministry for Health, Welfare and Family Affairs, Republic of Korea (Grant Number A084589).
Conflict of interest
Byung-Lae Park, Hyun Sub Cheong and Lyoung Hyo Kim are employees, and Hyoung Doo Shin is a CEO of SNP Genetics, Inc., which is located at #TE1007, Teilhard hall, Sogang University, Shinsu-dong, Mapo-gu, Seoul, 121-742, Republic of Korea. This company provided the iScan scanner instrument and BeadStudio 3.0 software used in the research. They also were involved in the study design, data collection and analysis, decision to publish and preparation of the manuscript. However, these competing interests do not alter our adherence to all the Human Genetics policies. No other relevant competing interests are declared.
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B. L. Park and J. W. Kim contributed equally to this work.
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The supplementary data below include one figure and four tables.
Supplementary Figure 1. Haplotype and linkage disequilibrium among polymorphisms in the ADH gene cluster (4q22-24).
Supplementary Table 1. Genome-wide association results of alcohol dependence including nominal association (p < 0.01) in a Korean population
Supplementary Table 2. Frequencies of polymorphisms in the ADH gene cluster in second follow-up study of Korean populations (n = 975).
Supplementary Table 3. Referent analysis of ADH1B rs1229984 (H48R) with the risk of alcohol dependence (n = 975).
Supplementary Table 4. Association analysis of haplotypes in the ADH gene cluster with risk of alcoholism and conditional analysis of the subjects selected for follow-up study.
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Park, B.L., Kim, J.W., Cheong, H.S. et al. Extended genetic effects of ADH cluster genes on the risk of alcohol dependence: from GWAS to replication. Hum Genet 132, 657–668 (2013). https://doi.org/10.1007/s00439-013-1281-8
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DOI: https://doi.org/10.1007/s00439-013-1281-8