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Genetic Factors in the Development of Adverse Drug Reactions: Challenges and Strategies for Minimization

By Galyna Cordero, QPPV, Head of Pharmacovigilance Department, Clinical Expert, JSC "Farmak"

Abstract

Adverse drug reactions (ADRs) are a major concern in healthcare, impacting both patient safety and costs. Genetic factors significantly influence how individuals metabolize drugs, affecting their response and susceptibility to ADRs. This article explores the genetic basis of ADRs, focusing on polymorphisms in drug-metabolizing enzymes (e.g., CYP450), transporters (e.g., ABCB1), and drug targets (e.g., VKORC1). Understanding these genetic variations is key to minimizing ADR risks and optimizing treatment outcomes through personalized medicine. Advances in pharmacogenomics, while promising, present challenges in routine clinical integration due to complexity, ethical concerns, and regulatory needs.

Introduction

Adverse drug reactions vary greatly between individuals, largely due to genetic factors. These factors influence drug metabolism, transport, and target interactions, leading to variability in drug efficacy and safety. Pharmacogenomics helps identify these genetic differences, paving the way for personalized medicine, where drug therapies are tailored to an individual's genetic profile.

Key Genetic Factors Influencing ADRs:

  1. Pharmacogenetics: Variations in CYP450 enzymes (CYP2D6, CYP2C19, etc.) and genes like ABCB1 and VKORC1 impact drug metabolism and response, leading to ADRs.
  2. Drug Transporters: Variants in genes like ABCB1 affect drug absorption, while SLCO1B1 influences statin metabolism, increasing the risk of myopathy.
  3. Drug Targets: Genetic variations in targets like VKORC1 require personalized dosing to prevent adverse effects, such as bleeding with warfarin.

Strategies for Minimizing ADRs

  • Pharmacogenetic Testing: Identifying genetic variants before prescribing medications can prevent ADRs.
  • Personalized Medicine: Tailoring drug therapies based on genetic profiles improves treatment outcomes.
  • Regulatory Frameworks: Establishing guidelines for genetic data use ensures ethical implementation and patient safety.

Conclusion

Recognizing genetic factors in ADR development is vital for advancing personalized medicine. By leveraging pharmacogenomics, healthcare providers can reduce ADRs and enhance treatment efficacy, leading to improved patient care and safety.

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