||~10% more likely to respond to citalopram
||~10% less likely to respond to citalopram
rs1954787, located in an intron of the GRIK4 gene, was found to be associated with a somewhat increased rate of successful response to treatment of depression with the drug citalopram. [PMID 17671280]
From the abstract of this article:
"The effect size of (this) GRIK4 marker alone was modest, but homozygote carriers of the treatment-response-associated marker alleles of both the GRIK4 and HTR2A (see rs7997012) genes were 23% less likely to experience nonresponse to (citalopram) treatment relative to participants who did not carry any of these marker alleles."
[PMID 19924111] Polymorphisms in GRIK4, HTR2A, and FKBP5 Show Interactive Effects in Predicting Remission to Antidepressant Treatment
[PMID 21172166] Pharmacogenetics of antidepressant response.
[PMID 21208417] International Study to Predict Optimized Treatment for Depression (iSPOT-D), a randomized clinical trial: rationale and protocol.
[PMID 23394390] Influence of genetic polymorphisms in the glutamatergic and GABAergic systems and their interactions with environmental stressors on antidepressant response