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Pharmacogenetics and Pharmacogenomics: Overview01:29

Pharmacogenetics and Pharmacogenomics: Overview

Pharmacogenetics and pharmacogenomics examine how genetic factors influence an individual's response to drugs. While pharmacogenetics focuses on the impact of specific genetic variants on drug effects, pharmacogenomics takes a broader approach, studying how genetic variation across populations contributes to differences in drug responses. These fields aim to explain why individuals may experience varying levels of efficacy or adverse reactions to the same medication.Variability in drug...
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...
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...
Pharmacogenomics: Identification of New Drug Targets01:29

Pharmacogenomics: Identification of New Drug Targets

Advances in genomics have profoundly influenced drug discovery by increasing both the speed and accuracy of pharmaceutical development. Pharmacogenomics, which examines how genetic variation influences drug response, facilitates the identification of novel therapeutic targets and enables patient stratification for personalized treatment. These strategies contribute to improved drug efficacy, minimized adverse effects, and more efficient clinical trial design.Mapping genetic differences...
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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,...

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Overview of pharmacogenetics.

David A Katz1

  • 1Abbott Laboratories, Abbott Park, Illinois, USA.

Current Protocols in Human Genetics
|April 23, 2008
PubMed
Summary

Pharmacogenetics studies how genetic variations affect drug responses. This field is crucial for drug discovery, improving safety, and understanding toxicity by examining diverse genetic factors and research quality.

Area of Science:

  • Pharmacology
  • Genetics
  • Drug Discovery

Background:

  • Pharmacogenetics investigates the link between genetic variation and individual differences in drug response.
  • Over 15 years, the field has identified diverse genetic factors, pathways, and mechanisms influencing drug efficacy and safety.
  • Pharmacogenetics is increasingly vital in pharmacology for target validation, lead optimization, and understanding idiosyncratic toxicity.

Purpose of the Study:

  • To provide a comprehensive overview of the history and evolution of pharmacogenetics.
  • To highlight current research applications of pharmacogenetics in drug discovery and development.
  • To discuss critical research quality issues pertinent to human subjects research in pharmacogenetics.

Main Methods:

  • Literature review of historical developments in pharmacogenetics.

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  • Analysis of current research trends and applications in drug discovery.
  • Examination of quality control and ethical considerations in human pharmacogenetics research.

    • Main Results:

    • The field has evolved significantly, revealing a wide array of genetic factors impacting drug response.
    • Pharmacogenetics plays a key role in modern drug development, from target identification to toxicity assessment.
    • Ensuring research quality is paramount for reliable human subjects research in pharmacogenetics.

    Conclusions:

    • Pharmacogenetics is a rapidly advancing field with profound implications for personalized medicine.
    • Continued research and attention to quality are essential for maximizing the benefits of pharmacogenetics in drug discovery and clinical practice.