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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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In Vivo Modeling of the Morbid Human Genome using Danio rerio
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Consequences of POR mutations and polymorphisms.

Walter L Miller1, Vishal Agrawal, Duanpen Sandee

  • 1Department of Pediatrics, University of California, San Francisco, San Francisco, CA 94143-0978, USA. wlmlab@ucsf.edu

Molecular and Cellular Endocrinology
|November 13, 2010
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Summary

P450 oxidoreductase (POR) variants impact steroidogenesis and drug metabolism. Severe mutations cause Antley-Bixler syndrome, while common variants like A503V affect P450c17 activity and drug metabolism.

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Area of Science:

  • Biochemistry
  • Genetics
  • Pharmacology

Background:

  • P450 oxidoreductase (POR) is essential for electron transfer to cytochrome P450 enzymes involved in steroidogenesis and drug metabolism.
  • Severe POR mutations cause Antley-Bixler syndrome (ABS), characterized by skeletal malformations and impaired steroidogenesis, but the molecular basis remains unclear.
  • POR exhibits significant genetic polymorphism, potentially influencing individual differences in steroid hormone production and drug response.

Purpose of the Study:

  • To characterize the functional activities of approximately 40 POR variants.
  • To correlate POR variant activity with clinical phenotypes, particularly Antley-Bixler syndrome and impaired steroidogenesis.
  • To investigate the impact of POR variants on the metabolism of various drug substrates by key cytochrome P450 enzymes, including CYP3A4.

Main Methods:

  • Assessed activities of ~40 POR variants using assays based on P450c17 activity and cytochrome c reduction.
  • Screened 35 POR variants for their ability to support the metabolism of EOMCC by CYP1A2 and CYP2C19.
  • Examined the effects of POR variants on CYP3A4 activity using multiple clinically relevant drug substrates.

Main Results:

  • POR variant activity assays based on P450c17 correlated better with clinical phenotypes than cytochrome c assays.
  • Common POR variants, such as A503V (28% of alleles), reduce P450c17 activity, and a promoter polymorphism (-152) reduces transcription.
  • Severe mutations (A287P, R457H) and common variants (A503V) significantly impair drug metabolism by CYP3A4, with activity varying by drug substrate.

Conclusions:

  • POR activity assays using P450c17 are more clinically relevant than cytochrome c assays for evaluating POR variants.
  • Genetic variations in POR, including common polymorphisms, contribute significantly to inter-individual differences in both steroidogenesis and drug metabolism.
  • Understanding POR variant function is crucial for diagnosing genetic disorders and predicting drug efficacy and toxicity.