Association between tryptophan hydroxylase 2 gene polymorphism and completed suicide
Sylwia Fudalej1, Mark Ilgen, Marcin Fudalej
1Medical University of Warsaw, Warsaw, Poland. sylwiaf@umich.edu
Suicide & Life-Threatening Behavior
|January 5, 2011
Summary
A specific gene variant in tryptophan hydroxylase 2 (TPH2) was linked to suicide risk. This genetic marker was more common in suicide victims, especially those with repeated attempts, suggesting a potential role in suicide vulnerability.
Area of Science:
- Neurogenetics
- Psychiatric Genetics
- Molecular Psychiatry
Background:
- The genetic underpinnings of suicide risk are complex and not fully understood.
- The tryptophan hydroxylase 2 (TPH2) gene plays a crucial role in serotonin synthesis, a neurotransmitter implicated in mood regulation and suicidal behavior.
Purpose of the Study:
- To investigate the association between a single nucleotide polymorphism (SNP) in the TPH2 gene (rs1386483) and suicide.
- To determine if this TPH2 genetic marker is specifically associated with individuals with a history of repeated suicide attempts.
Main Methods:
- Genotyping of the TPH2 gene polymorphism (rs1386483) was performed on DNA extracted from blood samples.
- Case-control study design comparing suicide victims (n=143) with age- and sex-matched controls (n=162).
- Statistical analysis to compare genotype frequencies between groups, with a focus on individuals with repeated suicide attempts.
Main Results:
- The TT genotype frequency of the TPH2 polymorphism was significantly higher in suicide victims compared to controls (17.5% vs. 8.6%; p = 0.02).
- This association was particularly pronounced in suicide victims with a history of repeated suicide attempts, showing a substantially higher frequency of the TT genotype (53.3% vs. 8.6%; p < 0.0001).
Conclusions:
- The studied TPH2 polymorphism (rs1386483) is associated with suicide.
- This genetic marker may serve as a significant indicator for understanding the risk of multiple suicide attempts.
- Further research is warranted to validate these findings and explore the underlying biological mechanisms.
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