alexa How and why to screen for CYP2D6 interindividual variability in patients under pharmacological treatments.
Pharmaceutical Sciences

Pharmaceutical Sciences

Journal of Pharmacogenomics & Pharmacoproteomics

Author(s): De Gregori M, Allegri M, De Gregori S, Garbin G, Tinelli C,

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Abstract Cytochromes P450 are members of a superfamily of hemoproteins that catalyze a variety of oxidative reactions in the metabolism of endogenous and exogenous hydrophobic substrates. Fifty-eight cytochrome P450 (CYP) isoenzymes belonging to 18 families have been identified in human cells; the corresponding genes are highly polymorphic, and genetic variability underlies interindividual differences in drug response. The polymorphisms of CYP2D6 significantly affect the pharmacokinetics of about 50\% of the drugs in clinical use, which are CYP2D6 substrates. The number of functional CYP2D6 alleles per genome determines the existence of four different phenotypes, i.e. poor, intermediate, extensive, and ultrarapid metabolizers. CYP2D6 genetic variants include copy number variations, single nucleotide substitutions, frameshift and insertion/deletion mutations. This review reports some of the different methodological approaches used to screen for CYP2D6 variants and focuses on methods that have improved variation detection, from conventional techniques to more recent microarray technology and high throughput DNA sequencing. In addition, this review reports some results on clinical relevance of CYP2D6 polymorphisms and provides examples of variability in drug response associated with interindividual phenotypic differences.
This article was published in Curr Drug Metab and referenced in Journal of Pharmacogenomics & Pharmacoproteomics

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