This SNP, located in an intron of the GRIK2 gene, has been linked in one study to increased thoughts of suicide in patients using the anti-depressant drug citalopram. The risk is only seen for individuals carrying two rs2518224(C) alleles, i.e. the rs2518224(C;C) homozygotes. The odds ratio for these individuals is 8.2. If the individual also has at least one rs4825476(G) allele, the odds ratio for having suicidal thoughts is increased to ~15x (CI: 3.7 - 60.6). [PMID 17898344]
[PMID 19724244] Genome-wide association study of suicidal ideation emerging during citalopram treatment of depressed outpatients.
[PMID 20008943] Association of FKBP5 polymorphisms with suicidal events in the Treatment of Resistant Depression in Adolescents (TORDIA) study.