None of the genetic markers within SLC6A4, MAOA, TPH1 and TPH2 were significantly associated with completed suicide or suicide method in the basic association tests.
This study was designed to examine whether the -473T > A and -8396G > C polymorphisms of the TPH2 gene may be associated with completed suicide in subjects with major psychoses from the Stanley Foundation Brain Bank sample.
When we analyzed suicidal behavior, we found a significant association with the rs1360780 of FKBP5 and suicidal behavior risk in the overall population and rs3800373 in completed suicide subgroup.
Our previous work showed an association of the single nucleotide polymorphism (SNP) rs6265 in the BDNF gene with completed suicide in the Slavic population.
Since our previous work on completed suicide in Slavic population showed an association of the functional single nucleotide polymorphism (SNP) rs6265 in the BDNF gene, we decided to extend the investigation and test additional SNPs in the BDNF gene, rs7124442, rs10767664, rs962369, rs12273363, rs908867, rs1491850, and rs1491851, for association with completed suicide.
Since ineffective stress response mechanisms are considered as a biological background of suicide behavior, we aimed to analyze a possible association between FKBP5 functional polymorphisms and completed suicide.
The distributions of TT, TC, and GT haplotypes of the FKBP5 gene (comprised of rs3800373 and rs1360780) between the completed suicide and control groups were significantly different (p<0.05 for each haplotype).
None of the genetic markers within SLC6A4, MAOA, TPH1 and TPH2 were significantly associated with completed suicide or suicide method in the basic association tests.
We hypothesized that DNA variants affecting neurodevelopment such as rs4307059 (CDH10/CDH9), rs930752 (NRXN1), rs6265 (BDNF) or rs10868235 (NTRK2) may predispose to completed suicide.
Our results are strikingly parallel with earlier data reporting a higher risk of completed suicide in July borns, and higher scores of July borns and lower scores of autumn borns on certain affective temperament scales, both of which are also associated with the s allele of 5-HTTLPR.
In humans, the G variant of the C(-1019)G 5-HT1A receptor promoter gene polymorphism (rs6295) has been associated with higher expression of 5-HT1A receptors, increased depression, and lower stress preceding completed suicide.
A Japanese team reported an association between the insertion allele of the angiotensin-converting enzyme (ACE) gene insertion/deletion (I/D) polymorphism with completed suicide.
To explore the hypothesis that the 5-HT1A receptor-induced serotonergic dysfunction is implicated genetically in suicide, we focused on the structural polymorphisms, Pro16Leu and Gly272Asp, of the 5-HT1A receptor gene, and examined the association between suicide victims who completed suicide and these two polymorphisms.
However, additional association tests yielded four significant PsychArray variants (SP110, rs181058279; AGBL2, rs76215382; SUCLA2, rs121908538; APH1B, rs745918508), raising the likelihood that these genes confer risk of completed suicide.
However, additional association tests yielded four significant PsychArray variants (SP110, rs181058279; AGBL2, rs76215382; SUCLA2, rs121908538; APH1B, rs745918508), raising the likelihood that these genes confer risk of completed suicide.