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Pharmacogenetics of Drug Metabolism: Overview01:27

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Genetic polymorphism in drug metabolism is crucial to the inter-individual variability observed in drug responses. Drug metabolism primarily involves the chemical modification of drugs and other xenobiotics to enhance their elimination by increasing their polarity. Two main classes of enzymes mediate this biotransformation process: Phase I enzymes, primarily cytochrome P450s, catalyze oxidation and reduction reactions, while other enzymes, such as esterases, mediate hydrolysis, and Phase II...
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Idiosyncratic drug reactions represent abnormal chemical responses that vary significantly among individuals, ranging from extreme sensitivity to low doses to insensitivity to high doses. These reactions often occur due to the drug's covalent binding with serum proteins, forming a foreign hapten that triggers an immunotoxicological response. The variability in drug reactions has a strong pharmacogenetic foundation, with genetic differences crucial in how individuals metabolize drugs. For...
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Genetic variations significantly influence drug response through pharmacokinetics, receptor interactions, and biologic milieu modifications. Pharmacokinetic alterations impact drug metabolism and clearance, affecting efficacy and toxicity. Variants in drug-metabolizing enzymes, such as CYP2C9 and CYP2C19, alter drug activation and elimination. For example, CYP2C9 loss-of-function variants require lower warfarin doses to prevent excessive bleeding, while CYP2C19 variants reduce clopidogrel...
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Genetic polymorphisms in drug targets have emerged as critical determinants of interindividual variability in drug response and toxicity. Pharmacogenomic investigations increasingly focus on identifying these variations to personalize and optimize therapeutic interventions. A drug target may be a receptor, enzyme, or signaling protein involved in pharmacologic responses or disease-related pathways. While early pharmacogenetic studies focused primarily on drug metabolism, current research...
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Phase II biotransformation reactions are essential for detoxifying and eliminating xenobiotics, including many pharmaceutical compounds. These reactions typically involve conjugation, the covalent attachment of polar endogenous groups such as glucuronic acid, sulfate, methyl, or acetyl moieties to functional groups introduced during Phase I metabolism. The resulting conjugates are more water-soluble, enabling efficient renal or biliary excretion.The major classes of Phase II enzymes include...
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Cytochrome P450 (CYP450) enzymes are a superfamily of heme-containing monooxygenases that play a pivotal role in Phase I drug metabolism by catalyzing oxidation and reduction reactions.These enzymes transform lipophilic xenobiotics into more hydrophilic metabolites, facilitating subsequent Phase II conjugation and eventual excretion. The CYP450 family is classified into families (e.g., CYP1–CYP3) and subfamilies (e.g., CYP2A, CYP2C), based on amino acid sequence homology.CYP450...
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Ethanol metabolism, toxicity and genetic polymorphism.

K Iwahashi1, H Suwaki1

  • 1Department of Neuropsychiatry, Kagawa Medical School, Kida-gun, Miki-cho, Kagawa 761-07Department of Physiology, Azabu University, Sagamihara-city, Fuchinobe 1-17-71, Kanagawa, 229, Japan.

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Genetic variations in alcohol dehydrogenase (ADH) and aldehyde dehydrogenase (ALDH) influence alcohol metabolism and toxicity. ALDH2 deficiency, common in East Asians, causes flushing and reduces alcohol dependence risk.

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Area of Science:

  • Pharmacogenetics
  • Toxicology
  • Human Genetics

Background:

  • Individual differences in alcohol metabolism and toxicity are linked to genetic variations.
  • Key enzymes involved include alcohol dehydrogenase (ADH), aldehyde dehydrogenase (ALDH), and cytochrome P-4502E1 (CYP2E1).

Purpose of the Study:

  • To review the relationships between genetic polymorphisms of ADH, ALDH, and CYP2E1 and alcohol metabolism/toxicity.
  • To explore the role of ALDH2 deficiency in alcohol-related behaviors and health outcomes.

Main Methods:

  • Review of recent studies involving DNA analysis.
  • Examination of genetic polymorphism data for ADH, ALDH, and CYP2E1.
  • Analysis of associations between genotypes and alcohol metabolism, toxicity, and dependence.

Main Results:

  • ALDH2 isozyme deficiency (ALDH2*2) causes flushing and increased acetaldehyde levels after alcohol consumption.
  • ALDH2 deficiency is prevalent in people of Mongoloid origin and is associated with lower alcohol dependence.
  • Polymorphisms in ALDH2 and CYP2E1 may influence susceptibility to alcohol-induced liver injury.
  • CYP2E1 (c2 gene) and ALDH2*1 genotypes may affect ethanol and acetaldehyde elimination at low blood ethanol levels.

Conclusions:

  • Genetic variations, particularly in ALDH2, significantly impact alcohol metabolism, toxicity, and the development of alcohol dependence.
  • ALDH2 deficiency serves as a protective factor against alcohol dependence in certain populations.
  • Further research into ALDH2 and CYP2E1 polymorphisms is warranted for understanding alcohol-related health risks.