Related Experiment Video
Updated: Mar 10, 2026
08:49
Rapid In Situ Hybridization using Oligonucleotide Probes on Paraformaldehyde-prefixed Brain of Rats with Serotonin Syndrome
Published on: September 23, 2015
9.3K
Association between serotonin transporter gene polymorphisms and heroin dependence: a meta-analytic study
1Department of Psychiatry, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan.
Neuropsychiatric Disease and Treatment
|December 13, 2016
Summary
The S allele of the serotonin transporter gene (5-HTTLPR) is linked to increased heroin dependence risk, particularly in Caucasians. The STin2 polymorphism showed no significant association.
Area of Science:
- Genetics
- Neuroscience
- Addiction Research
Background:
- Previous studies on the association between heroin dependence and serotonin transporter gene polymorphisms have produced conflicting findings.
- Understanding genetic predispositions is crucial for developing targeted prevention and treatment strategies for heroin dependence.
Purpose of the Study:
- To conduct a meta-analysis to determine the overall effect of serotonin transporter gene polymorphisms on the risk of heroin dependence.
- To investigate the association of two specific polymorphisms, 5-HTTLPR and STin2, with heroin dependence.
Main Methods:
- A meta-analysis synthesized data from 6 studies on the 5-hydroxytryptamine transporter-linked promoter region (5-HTTLPR) polymorphism and 8 studies on the serotonin transporter intron 2 (STin2) polymorphism.
- Random effects models were used to calculate overall odds ratios and confidence intervals for the association between these polymorphisms and heroin dependence.
- Subgroup analysis was performed based on ethnicity.
Main Results:
- A significant association was found between the S allele of 5-HTTLPR and an increased risk of heroin dependence (OR = 1.22, P = 0.002).
- This association was significant in Caucasian subjects (OR = 1.37, P = 0.003) but not in non-Caucasian subjects, suggesting an ethnic-specific effect.
- No significant association was found between the STin2 polymorphism and heroin dependence (OR = 1.14, P = 0.242).
Conclusions:
- The 5-HTTLPR polymorphism, specifically the S allele, appears to influence the risk for heroin dependence in an ethnic-specific manner.
- Further research is needed to explore the influence of genetic variations in individuals with comorbidities or intermediate phenotypes of heroin dependence.
Related Concept Videos
01:29Pharmacogenetic Phenotypes: Alterations in Pharmacokinetics, Drug Targets and Biologic Milieu
81
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...
81
01:11Pharmacogenetics of Drug Targets: β₂-Adrenergic Receptors, Apo E, Thymidylate Synthase
60
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...
60
01:16Pharmacogenetics of Drug Transporters: P-Glycoprotein and Solute Carrier Transporters
85
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...
85
01:28Human Genetics
1.8K
Human genetics provides a profound framework for understanding the interplay between genetic predispositions and human psychology. At the heart of this discipline lies the study of how genes influence physical traits, behaviors, and susceptibility to diseases. Each person carries a unique genetic code that subtly or significantly shapes their psychological and behavioral landscape.
The complex relationship between genetics and psychology is observable through common biological components such...
The complex relationship between genetics and psychology is observable through common biological components such...
1.8K
01:27Pharmacogenetics of Drug Metabolism: Overview
77
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...
77
01:27Principles of Pharmacogenetics: Types of Genetic Variants
69
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...
69