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Related Concept Videos

Pharmacogenetics of Drug Metabolism: Overview01:27

Pharmacogenetics of Drug Metabolism: Overview

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...
Drug toxicity: Idiosyncratic Reactions01:16

Drug toxicity: Idiosyncratic Reactions

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...
Factors Affecting Drug Biotransformation: Biological01:19

Factors Affecting Drug Biotransformation: Biological

Biological factors significantly impact drug metabolism, influencing drug clearance, efficacy, and potential toxicity.
Species differences: Variations in enzyme systems across species can cause disparities in drug metabolism. For instance, humans may metabolize certain drugs faster than rodents, altering therapeutic effects.
Strain differences: Genetic variations within a species can result in differing enzyme activity, impacting drug response and toxicity. For example, some mouse strains may...
Pharmacogenetics of Phase I Enzymes: Cytochrome P450 Isozymes01:28

Pharmacogenetics of Phase I Enzymes: Cytochrome P450 Isozymes

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 isoenzymes,...
Principles of Pharmacogenetics: Types of Genetic Variants01:27

Principles of Pharmacogenetics: Types of Genetic Variants

The human genome is over 99.9% identical between individuals, yet genetic differences exist at millions of bases. The human genome contains approximately 3 million variant positions per individual, many of which are heterozygous, contributing to genetic diversity and individual traits. Genetic variations include single-nucleotide polymorphisms (SNPs), insertions, deletions, and copy number variations (CNVs).SNPs, the most common variation, involve single-base changes in DNA. These can be...
Pharmacogenetic Phenotypes: Alterations in Pharmacokinetics, Drug Targets and Biologic Milieu01:29

Pharmacogenetic Phenotypes: Alterations in Pharmacokinetics, Drug Targets and Biologic Milieu

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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Interindividual differences in phytochemical metabolism and disposition.

Johanna W Lampe1, Jyh-Lurn Chang

  • 1Fred Hutchinson Cancer Research Center and Nutritional Sciences Program, Department of Epidemiology, University of Washington, Seattle, WA 98109, USA. jlampe@fhcrc.org

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Genetic variations influence how your body processes plant compounds called phytochemicals. Understanding these gene-phytochemical interactions may explain individual differences in disease risk.

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Area of Science:

  • Nutritional Science
  • Genetics
  • Pharmacology

Background:

  • Phytochemicals, bioactive compounds in plants, offer health benefits and disease risk reduction.
  • Individual responses to phytochemicals vary due to genetic differences in their metabolism and distribution.
  • Limited research exists on human gene-phytochemical interactions.

Purpose of the Study:

  • To review factors influencing phytochemical metabolism and disposition.
  • To highlight the roles of intestinal bacteria and genetic variations in phase II enzymes in phytochemical handling.

Main Methods:

  • Literature review focusing on gene-phytochemical interactions.
  • Discussion of metabolic pathways and genetic polymorphisms.
  • Emphasis on the impact of gut microbiota and host genetics.

Main Results:

  • Genetic variations significantly affect the absorption, metabolism, and distribution of phytochemicals.
  • Intestinal bacteria play a crucial role in modifying phytochemicals.
  • Genetically polymorphic phase II enzymes are key determinants of individual phytochemical exposure.

Conclusions:

  • Gene-phytochemical interactions are critical for understanding individual disease risk.
  • Further research into these interactions is needed to personalize nutrition and disease prevention strategies.