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Risk and protective genetic variants in suicidal behaviour: association with SLC1A2, SLC1A3, 5-HTR1B &NTRK2
Therese M Murphy1, Maria Ryan, Tom Foster
1Department of Psychiatry & Mental Health Research, St. Vincent's University Hospital, University College Dublin, Elm Park, Dublin 4, Ireland. murphyth@tcd.ie
Genetic variants in SLC1A2/3, 5-HTR1B, and NTRK2 may influence suicidal behavior risk. This study explored gene-gene and gene-environment interactions in patients with psychiatric disorders and a history of suicide attempts.
Area of Science:
- Neuroscience
- Genetics
- Psychiatry
Background:
- Suicidal behavior aggregates in families, with patients having psychiatric disorders at higher risk for suicide attempts (SA).
- Genetic risk variants for suicide may be independent of underlying psychiatric disorders.
- Investigating neurobiological pathways linked to suicidal behavior and associated endophenotypes is crucial.
Purpose of the Study:
- To investigate the association between genetic variants in candidate genes and SA in patients with co-existing psychiatric illness.
- To explore potential gene-gene and gene-environment interactions related to SA.
- To identify specific genetic markers contributing to suicidal behavior.
Main Methods:
- DNA was obtained from 159 patients (76 attempters, 83 non-attempters) with DSM-IV psychiatric diagnoses.
- Genotyping of 28 single nucleotide polymorphisms (SNPs) from 18 candidate genes was performed.
- Association tests (Chi squared, Armitage Trend) and binary logistic regression were used to analyze genetic associations and interactions.
Main Results:
- Four SNPs (rs4755404, rs2269272, rs6296, rs1659400) showed evidence of association with SA.
- A 3-locus gene-gene interaction was identified.
- A potential gene-environment interaction indicated NTRK2 variation may moderate childhood abuse risk for SA.
Conclusions:
- Allelic variability in SLC1A2/3, 5-HTR1B, and NTRK2 may be relevant to the predisposition for suicidal acts.
- These findings highlight specific genes and interactions potentially involved in suicidal behavior.
- Further research is warranted to elucidate the complex genetic underpinnings of suicidal behavior.
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