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Pharmacogenetics of Phase II Enzymes: N-acetyltransferase, Thiopurine S-methyltransferase, UDP-glucuronosyltransferase01:27

Pharmacogenetics of Phase II Enzymes: N-acetyltransferase, Thiopurine S-methyltransferase, UDP-glucuronosyltransferase

Phase II biotransformation reactions are essential for detoxifying and eliminating xenobiotics, including many pharmaceutical compounds. These reactions typically involve conjugation, the covalent attachment of polar endogenous groups such as glucuronic acid, sulfate, methyl, or acetyl moieties to functional groups introduced during Phase I metabolism. The resulting conjugates are more water-soluble, enabling efficient renal or biliary excretion.The major classes of Phase II enzymes include...
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Genetic polymorphisms in drug targets have emerged as critical determinants of interindividual variability in drug response and toxicity. Pharmacogenomic investigations increasingly focus on identifying these variations to personalize and optimize therapeutic interventions. A drug target may be a receptor, enzyme, or signaling protein involved in pharmacologic responses or disease-related pathways. While early pharmacogenetic studies focused primarily on drug metabolism, current research...
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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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Idiosyncratic drug reactions represent abnormal chemical responses that vary significantly among individuals, ranging from extreme sensitivity to low doses to insensitivity to high doses. These reactions often occur due to the drug's covalent binding with serum proteins, forming a foreign hapten that triggers an immunotoxicological response. The variability in drug reactions has a strong pharmacogenetic foundation, with genetic differences crucial in how individuals metabolize drugs. For...
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The pharmacogenetics of drug transporters is increasingly recognized as a critical factor influencing interindividual variability in drug absorption, distribution, and elimination. These membrane-bound proteins regulate drugs' movement across cellular barriers by actively pumping them out (efflux) or facilitating their uptake (influx). Among the major transporter families, ATP-binding cassette (ABC) and solute carrier (SLC) transporters play particularly prominent roles. Genetic polymorphisms...
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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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A Method to Study the C924T Polymorphism of the Thromboxane A2 Receptor Gene
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TPH2 polymorphisms and alcohol-related suicide.

Tomaž Zupanc1, Peter Pregelj, Martina Tomori

  • 1Institute of Forensic Medicine, Faculty of Medicine, University of Ljubljana, Korytkova ulica 2, SI-1000 Ljubljana, Slovenia.

Neuroscience Letters
|December 25, 2010
PubMed
Summary

Genetic factors influence suicidal behavior and alcoholism. Specific gene variations (SNPs) show associations with suicide and alcohol-related suicide, suggesting a link between genetic predisposition and these outcomes.

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Area of Science:

  • Neuroscience
  • Genetics
  • Psychiatry

Background:

  • Suicidal behavior and alcoholism risk are influenced by genetic and environmental factors.
  • Serotonergic dysfunction is implicated in substance abuse and suicidal behavior.
  • Previous studies on TPH2 gene polymorphisms showed limited association with suicide and alcohol-related suicide.

Purpose of the Study:

  • To investigate the association between specific single nucleotide polymorphisms (SNPs) and suicide.
  • To explore the relationship between these SNPs and alcohol-related suicide.
  • To examine the link between alcohol misuse, impulsivity, and aggressive behavior in suicide victims.

Main Methods:

  • SNP and alcohol analysis were performed on 388 suicide victims and 227 controls.
  • Psychological autopsies were conducted on a subsample of 79 suicide victims.
  • Statistical analyses (Pχ²) were used to determine associations.

Main Results:

  • SNP Rs1843809 was significantly associated with suicide (Pχ²=0.043) and alcohol-related suicide (Pχ²=0.021).
  • Polymorphism Rs1386493 showed a tendency for association with alcohol-related suicide (Pχ²=0.055).
  • Alcohol misuse or dependency in suicide victims was linked to increased impulsive (Pχ²=0.016) and verbal aggressive behavior (Pχ²=0.025).

Conclusions:

  • Polymorphisms in specific genes are implicated in suicide and alcohol-related suicide.
  • Further research is needed to elucidate the complex interplay between serotonergic dysfunction, suicide, alcohol dependence, impulsivity, and the TPH2 enzyme.