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Pharmacogenetic Phenotypes: Alterations in Pharmacokinetics, Drug Targets and Biologic Milieu

Pharmacogenetic Phenotypes: Alterations in Pharmacokinetics, Drug Targets and Biologic Milieu

Genetic variations significantly influence drug response through pharmacokinetics, receptor interactions, and biologic milieu modifications. Pharmacokinetic alterations impact drug metabolism and clearance, affecting efficacy and toxicity. Variants in drug-metabolizing enzymes, such as CYP2C9 and CYP2C19, alter drug activation and elimination. For example, CYP2C9 loss-of-function variants require lower warfarin doses to prevent excessive bleeding, while CYP2C19 variants reduce clopidogrel...

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Genetic polymorphism in drug metabolism is crucial to the inter-individual variability observed in drug responses. Drug metabolism primarily involves the chemical modification of drugs and other xenobiotics to enhance their elimination by increasing their polarity. Two main classes of enzymes mediate this biotransformation process: Phase I enzymes, primarily cytochrome P450s, catalyze oxidation and reduction reactions, while other enzymes, such as esterases, mediate hydrolysis, and Phase II...

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Drug toxicity: Idiosyncratic Reactions

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Adverse Drug Reactions (ADRs) are potential complications that arise during pharmacotherapy, influenced by multiple risk factors. Age plays a significant role; both neonates and the elderly are at heightened risk due to their respective immature and diminished metabolic and elimination processes. Gender also impacts ADRs, with females experiencing a 1.5 to 1.7-fold greater risk than males, which may be linked to pharmacokinetic, pharmacodynamic, and hormonal differences. Notably, neonates, the...

Types of Toxins

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Humans continually engage with an environment rich in potentially harmful chemicals. These are introduced to our bodies through inhalation, ingestion, or skin contact. These chemicals exist in various forms, such as air and environmental pollutants, agricultural chemicals, organic solvents, and heavy metals.
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Related Experiment Video

Updated: May 28, 2026

Quantification of three DNA Lesions by Mass Spectrometry and Assessment of Their Levels in Tissues of Mice Exposed to Ambient Fine Particulate Matter

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Genetic Polymorphisms as Modifiers of Health Risks from Exposure to Toxic Elements: A Traditional Literature Review.

Mariangela Palazzo¹, Andrea Borghini¹, Elisa Bustaffa¹

¹Institute of Clinical Physiology, National Research Council, 56124 Pisa, Italy.

|May 27, 2026

Summary

Genetic factors, like single-nucleotide polymorphisms (SNPs), influence how individuals respond to toxic element (TE) exposure. Understanding these genetic variations is key to explaining differences in health effects from environmental toxins.

Keywords:

cancer risk cardiovascular disease gene–environment interaction heavy metals neurological disorders single-nucleotide polymorphisms toxic elements

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Quantification of three DNA Lesions by Mass Spectrometry and Assessment of Their Levels in Tissues of Mice Exposed to Ambient Fine Particulate Matter

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Analysis of the Ambient Particulate Matter-induced Chromosomal Aberrations Using an In Vitro System

Analysis of the Ambient Particulate Matter-induced Chromosomal Aberrations Using an In Vitro System

Published on: December 21, 2016

Area of Science:

Environmental Health
Toxicology
Genetics

Background:

Toxic elements (TEs) like arsenic, cadmium, and lead are linked to severe health issues, including cancer and cardiovascular diseases.
Individual susceptibility to TEs varies, necessitating research into factors influencing these differences.
Genetic variability, specifically single-nucleotide polymorphisms (SNPs), is emerging as a critical determinant of response to TE exposure.

Purpose of the Study:

To review the role of genetic susceptibility and gene-environment interactions in toxic element exposure.
To highlight single-nucleotide polymorphisms (SNPs) as key modulators of individual risk from toxic elements.
To summarize toxic metals, epidemiological evidence, and the impact of genetic background on toxicity.

Main Methods:

Literature review focusing on epidemiological and toxicological evidence.
Analysis of genetic variability, including specific gene variants (e.g., DMT1, GSTP1, MT2A, hOGG1, XRCC1).
Examination of gene-environment interactions and their role in modulating toxic element effects.

Main Results:

Evidence suggests SNPs in genes related to metal transport, detoxification, and DNA repair may influence susceptibility to TEs.
Current research is limited by small sample sizes, inconsistent exposure assessments, and insufficient consideration of ethnic diversity and GxE interactions.
Genetic background plays a significant role in modulating the toxicity induced by environmental elements.

Conclusions:

Genetic factors, particularly SNPs, are crucial in determining individual responses to toxic element exposure.
Further research requires large, well-characterized populations with detailed exposure and lifestyle data to clarify gene-environment interactions.
Understanding genetic susceptibility is essential for assessing and mitigating health risks associated with toxic element exposure.