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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...
Pharmacogenomics: Identification of New Drug Targets01:29

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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...
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...
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...
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...
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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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(Mis)treating the pharmacogenetic incidentalome.

Isaac S Kohane1

  • 1Harvard Medical School Center for Biomedical Informatics, 10 Shattuck Street, Boston, Massachusetts 02115, USA. isaac_kohane@harvard.edu

Nature Reviews. Drug Discovery
|February 2, 2012
PubMed
Summary
This summary is machine-generated.

Genome-wide screening aids personalized medicine by linking genetic variations to drug responses. Careful analysis is crucial to avoid overstating the impact of initial pharmacogenomic findings.

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Area of Science:

  • Genomics
  • Pharmacogenomics
  • Personalized Medicine

Background:

  • Genome-wide screening holds promise for advancing personalized medicine.
  • Identifying associations between genomic variants and drug responses is key.
  • Potential overstatement of pharmacogenomic findings could hinder progress.

Purpose of the Study:

  • To highlight the importance of rigorous validation in pharmacogenomic studies.
  • To ensure the reliable application of genomic insights in clinical practice.
  • To mitigate risks associated with premature conclusions from genome-wide association studies.

Main Methods:

  • Review of current methodologies in genome-wide screening.
  • Analysis of case studies demonstrating the impact of pharmacogenomic associations.
  • Discussion of strategies for validating and refining identified genomic-drug response links.

Main Results:

  • Initial genome-wide screens can identify numerous potential pharmacogenomic associations.
  • Subsequent validation studies are essential to confirm the clinical relevance and scope of these associations.
  • Failure to validate can lead to misapplication of genetic information in drug selection.

Conclusions:

  • Personalized medicine development relies on accurate and validated pharmacogenomic data.
  • Minimizing the impact of potentially narrow associations is critical for clinical utility.
  • Robust validation frameworks are necessary to translate genomic discoveries into effective patient care.