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Phenoconversion and in vivo phenotyping of hepatic cytochrome P450: Implications in predictive precision medicine and

Shakir Ali1, Cem Aygun2, Ibrahim Halil Bahcecioglu3

  • 1Department of Biochemistry, School of Chemical and Life Sciences, Jamia Hamdard, Hamdard Nagar, New Delhi, India.

Hepatology Forum
|July 21, 2025
PubMed

Insights

Cytochrome P450 (CYP) enzyme activity, crucial for drug metabolism, varies significantly. In vivo CYP phenotyping, measuring metabolite/drug ratios, is vital for optimizing drug doses and ensuring patient safety, especially in chronic liver disease.

Area of Science:

  • Pharmacology
  • Biochemistry
  • Genetics

Background:

  • Drug efficacy and toxicity are influenced by genetic, environmental, and co-administered substances.
  • Cytochrome P450 (CYP) enzymes are critical for Phase I drug metabolism, affecting bioavailability and potentially causing toxicity.
  • Hepatic CYPs metabolize approximately 75% of all drugs, highlighting their significance in pharmacotherapy.

Purpose of the Study:

  • To review variations in CYP activity and emphasize the importance of in vivo phenotyping over genotype analysis.
  • To highlight the role of metabolite/drug ratios in optimizing drug dosage and improving personalized treatment strategies.

Main Methods:

  • Review of scientific literature on Cytochrome P450 enzyme activity, drug metabolism, and phenotyping techniques.
  • Analysis of factors influencing CYP activity, including genetic polymorphisms and drug-drug interactions.
  • Discussion of the clinical utility of in vivo CYP phenotyping for drug dose optimization.

Main Results:

  • CYP genotype does not always correlate with actual enzyme activity, necessitating direct activity assessment.
  • In vivo phenotyping, through metabolite/drug ratio determination, provides a more accurate measure of drug biotransformation.
  • Variability in CYP activity, particularly for isoforms like CYP2B6, impacts the metabolism of numerous essential medications.

Conclusions:

  • In vivo CYP phenotyping is superior to genotype analysis for accurate drug bioavailability assessment and dose optimization.
  • Metabolite/drug ratio determination is a key tool for personalized medicine, especially for patients with chronic liver disease.
  • Understanding and measuring CYP activity is crucial for managing drug efficacy and preventing toxicity.
Keywords:
CYP phenotypingdrug metabolismpersonalized therapyprecision medicine

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