In 169 depressed patients randomized to treatment with either fluoxetine or nortriptyline, we examined whether polymorphisms of the serotonin transporter and the G protein beta3 subunit influenced response to these antidepressants. For depressed patients under the age of 25 yr the T allele of the G protein beta3 subunit was associated with a markedly poorer response to nortriptyline, while serotonin transporter polymorphisms did not predict antidepressant response. However, in patients 25 yr or older, the G protein beta3 polymorphisms did not predict antidepressant response, while the s,s genotype of the serotonin transporter was associated with a poorer response to both fluoxetine and nortriptyline. These differential pharmacogenetic predictors of antidepressant response by age, may provide clues to understanding the discontinuities in pharmacological responsiveness of child/adolescent and adult depressive disorders.
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