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Updated: Jul 10, 2026

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Published on: March 28, 2017
[Genotyping of CYP2D6 and CYP2C19]
O Slanar1, M Drazd'áková, K Babiárová
1Ustav klinické biochemie a laboratorní diagnostiky 1. LF UK a VFN, Praha 2 0dd4lenf klinicke farmakologie 1. LF UK a VFN, Praha. oslan@lf1.cuni.cz
Genetic variations in CYP2D6 enzyme activity significantly impact drug response. Patients experiencing adverse drug reactions or treatment failure showed fewer extensive CYP2D6 metabolizers compared to healthy individuals.
Area of Science:
- Pharmacogenomics
- Drug Metabolism
- Genetic Polymorphisms
Background:
- Drug metabolizing enzyme polymorphisms are key factors in adverse drug reactions and treatment outcomes.
- CYP2D6 and CYP2C19 gene variants influence drug efficacy and safety.
Purpose of the Study:
- To compare the prevalence of functional CYP2D6 and CYP2C19 polymorphisms.
- To assess differences between patients with adverse drug reactions/treatment failure and healthy controls.
Main Methods:
- Genotyping of CYP2D6 and CYP2C19 in 60 patients and 218 healthy controls.
- Analysis of genotype distribution and metabolic phenotypes.
Main Results:
- Significantly lower proportion of CYP2D6 extensive metabolizers in patients (25.0%) vs. controls (49.8%).
- Higher prevalence of CYP2D6 intermediate metabolizers in patients (58.3%) vs. controls (38.5%).
- Increased, though not statistically significant, proportion of poor metabolizers in patients.
Conclusions:
- CYP2D6 activity alterations are linked to clinically significant changes in drug effects.
- CYP2D6 gene polymorphisms play a crucial role in pharmacotherapy efficacy and safety.
Related Concept Videos
Pharmacogenetics of Phase I Enzymes: Cytochrome P450 Isozymes
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Pharmacogenetic Phenotypes: Alterations in Pharmacokinetics, Drug Targets and Biologic Milieu
Pharmacogenetics of Phase II Enzymes: N-acetyltransferase, Thiopurine S-methyltransferase, UDP-glucuronosyltransferase
Principles of Pharmacogenetics: Types of Genetic Variants
Pharmacogenetics of Drug Targets: β₂-Adrenergic Receptors, Apo E, Thymidylate Synthase
