The association between alcohol metabolism and genetic variants of ADH1A, SRPRB, and PGM1 in Korea

BACKGROUND

Excessive alcohol consumption is a major public health problem in East Asian countries. Alcohol use leads to a cascade of problems including increased chances of risky behavior and a wide range of negative health consequences, from alcoholic liver disease to upper gastric and liver cancer. These alcohol effects are known to be influenced by ethnic variability and genetics.

METHODS

In this study, subjects were administered a single dose of alcohol (0.6 g/kg for men or 0.4 g/kg for women), and blood alcohol and acetaldehyde concentrations were measured eight times over 5 hours. To investigate genetically susceptible factors to alcohol metabolism, we selected single-nucleotide polymorphisms (SNP) of genes identified by prior genetic association studies for alcohol metabolism, alcohol consumption, alcohol dependence, and related traits, and performed genotyping on all subjects (n = 104).

RESULTS

We identified variations in the ADH1A, SRPRB, and PGM1 genes, which are directly associated with blood alcohol or acetaldehyde concentrations. Namely, the T allele of SRPRB rs17376019 and the C allele of PGM1 rs4643 were associated with lower blood alcohol levels, while the ADH1 rs1229976 C allele group exhibited markedly higher blood acetaldehyde levels than those of the ADH1 rs1229976 T allele group.

CONCLUSION

This study demonstrates that genetic variations in ADH1A, SRPRB, and PGM1 are associated with variations in blood alcohol and acetaldehyde concentration after alcohol intake.

Ethanol Analysis in Postmortem and Human Performance Forensic Toxicology Cases

Ethanol analysis is probably the most common procedure performed in forensic and analytical toxicology laboratories worldwide. Ethanol poisoning is very important in both clinical and forensic investigations. In clinical evaluations, measuring the ethanol concentration is necessary for the timely and appropriate delivery of care to patients who may experience discomfort or life threatening ethanolic overdose or mixed ethanol-drug intoxication. In forensic toxicology investigations, ethanol is routinely measured in both human performance forensic toxicology cases such as drug-facilitated crimes and driving-under-the-influence cases, as well as in postmortem forensic toxicology cases. This review presents information regarding the most commonly analyzed biological specimens used in alcohol analysis including, among others, blood, breath, urine, oral fluid, and vitreous humor. Additionally, it presents the various chemical, biochemical, gas chromatographic, and breath testing techniques commonly employed in ethanol analysis and considers the main advantages and disadvantages of each. Finally, a brief discussion of quality assurance in alcohol analysis is presented.

Population pharmacokinetics and pharmacogenetics of alcohol in Chinese and Indians in Singapore

WHAT IS KNOWN AND OBJECTIVE

  Interindividual variability in alcohol pharmacokinetics is influenced by a number of factors, including polymorphisms in genes mediating alcohol pharmacology, ethnicity, sex and body size. Several studies have evaluated the population pharmacokinetics of alcohol from breath alcohol measures. None of these studies, however, have evaluated ethnicity and alcohol-metabolizing enzyme genotypes as covariates in their population pharmacokinetic modelling. We aimed to develop a population pharmacokinetic model using clinical and genetic factors and to identify covariates that influenced interindividual variability in alcohol clearance and volume of distribution.

METHODS

  Hundred and eighty healthy subjects (90 Chinese and 90 Indians; 45 males and 45 females from each ethnic group) ingested a vodka-orange juice mixture to simulate social drinking. Subjects were genotyped for the ADH1B (Arg48His), ALDH2 (Glu504Lys) and CYP2E1 (c.-1293G>C and c.-1053C>T) polymorphisms. A base pharmacokinetic model was developed using the nonmem software (NONMEM Project Group, University of California, San Francisco, San Francisco, CA, USA) to determine the alcohol clearance and volume of distribution. The model was extended to include covariates that influenced the between-subject variability.

RESULTS AND DISCUSSION

  Body weight and sex significantly influenced absorption rate and volume of distribution of alcohol. Body weight and ADH1B Arg48His polymorphism significantly influenced alcohol clearance. The Michaelis-Menten elimination rate (Vmax ) was decreased by 10% in homozygous ADH1B*1/*1 subjects. Ethnicity was not determined to be a significant covariate in the final population pharmacokinetic model.

WHAT IS NEW AND CONCLUSION

  Gender and body weight were covariates that contributed most to explaining the observed interindividual alcohol pharmacokinetic variability. Of the four SNPs examined in this study, only ADH1B Arg48His polymorphism had a significant, though modest, effect on the pharmacokinetics of alcohol.