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Principles of Pharmacogenetics: Types of Genetic Variants

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...

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...

Pharmacogenetics of Drug Targets: β₂-Adrenergic Receptors, Apo E, Thymidylate Synthase

Pharmacogenetics of Drug Targets: β₂-Adrenergic Receptors, Apo E, Thymidylate Synthase

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...

Comparing Copy Number Variations and SNPs

Comparing Copy Number Variations and SNPs

Sequencing of the human genome has opened up several best-kept secrets of the genome. Scientists have identified thousands of genome variations that exist within a population. These variations can be a single nucleotide or a larger chromosomal variation.
Copy number variations or CNVs are the structural variations that cover more than 1kb of DNA sequence. The single nucleotide polymorphism (SNP), on the other hand, is a single nucleotide change or a point mutation that is found in more than 1%...

Mutations

Mutations

Mutations

Mutations

Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...

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Updated: Jun 28, 2026

An Allele-specific Gene Expression Assay to Test the Functional Basis of Genetic Associations

An Allele-specific Gene Expression Assay to Test the Functional Basis of Genetic Associations

Published on: November 3, 2010

Gene polymorphisms in childhood ALL.

Nikolaos V Karathanasis¹, Despoina M Choumerianou, Maria Kalmanti

¹Department of Pediatrics, University Hospital of Heraklion, University of Crete, Heraklion, Crete, Greece.

Pediatric Blood & Cancer

|November 8, 2008

Summary

Genetic variations influence childhood acute lymphoblastic leukemia (ALL) risk and treatment outcomes. This review explores how gene polymorphisms impact ALL predisposition and survival in children.

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Last Updated: Jun 28, 2026

An Allele-specific Gene Expression Assay to Test the Functional Basis of Genetic Associations

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Identification and Classification of Position-specific GABAA Receptor Subunit Missense Variants for Their Role In Hippocampal Pyramidal Neurons

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Area of Science:

Pediatric Oncology
Genetics
Cancer Epidemiology

Background:

Childhood acute lymphoblastic leukemia (ALL) is a significant pediatric cancer.
Risk factors include inherited predisposition and environmental exposures.
Current treatments achieve high survival rates in developed nations.

Purpose of the Study:

To review and synthesize findings on the role of gene polymorphisms in childhood ALL.
To explore the influence of genetic variations on ALL predisposition.
To examine the impact of gene polymorphisms on treatment outcomes.

Main Methods:

Literature review of studies investigating gene polymorphisms and childhood ALL.
Analysis of research on genetic factors influencing ALL susceptibility.
Synthesis of data on the association between polymorphisms and event-free survival.

Main Results:

Gene polymorphisms in metabolic pathways are linked to ALL predisposition.
Specific genetic variations may affect treatment response and survival.
Evidence suggests a complex interplay between genetics and environmental factors.

Conclusions:

Gene polymorphisms play a role in childhood ALL development and prognosis.
Further research is needed to elucidate specific genetic mechanisms.
Understanding these genetic factors may lead to personalized treatment strategies.