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Related Concept Videos

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...
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...
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...
Drug Toxicity: Risk factors01:24

Drug Toxicity: Risk factors

Adverse Drug Reactions (ADRs) are potential complications that arise during pharmacotherapy, influenced by multiple risk factors. Age plays a significant role; both neonates and the elderly are at heightened risk due to their respective immature and diminished metabolic and elimination processes. Gender also impacts ADRs, with females experiencing a 1.5 to 1.7-fold greater risk than males, which may be linked to pharmacokinetic, pharmacodynamic, and hormonal differences. Notably, neonates, the...
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Pharmacodynamics in Geriatric Patients: Effects of Age

Age-related pharmacokinetic changes are extensively documented, but understanding age-related pharmacodynamic alterations is relatively limited. This knowledge gap can be partly attributed to the complexity of developing appropriate measures of drug responses compared to bioanalytical methods for determining drug concentrations.Most information regarding age-related differences in human pharmacodynamics originates from cross-sectional studies. However, these studies assume that observed mean...
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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...

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Related Experiment Videos

[Ethnic background related pharmacological differences].

H Reinbold1

  • 1LWL-Klinik, Dortmund. h.reinbold@wkp-lwl.org

MMW Fortschritte Der Medizin
|November 9, 2007
PubMed
Summary

Cytochrome P-450 gene variations affect drug metabolism in certain ethnic groups. Understanding these genetic differences is crucial for appropriate drug dosing to prevent adverse effects or treatment failure.

Area of Science:

  • Pharmacogenomics
  • Drug Metabolism

Background:

  • Cytochrome P-450 enzymes are critical for metabolizing numerous medications.
  • Genetic variations (polymorphisms) in these enzymes are prevalent in specific ethnic populations.

Purpose of the Study:

  • To highlight the impact of ethnic-specific cytochrome P-450 gene polymorphisms on drug metabolism.
  • To emphasize the clinical significance of these variations in medication prescribing.

Main Methods:

  • Review of existing literature on cytochrome P-450 genetics and drug metabolism.
  • Analysis of how enzyme activity variations influence pharmacokinetic profiles.

Main Results:

  • Ethnic groups exhibit distinct frequencies of cytochrome P-450 polymorphisms.

Related Experiment Videos

  • These polymorphisms lead to altered drug metabolism rates (rapid or slow).

    • Conclusions:

    • Genetic variations in cytochrome P-450 enzymes necessitate personalized drug dosage adjustments.
    • Consideration of pharmacogenetics is essential for optimizing therapeutic outcomes and minimizing adverse drug reactions.