Laymen's summary:
In this study on major depressive disorder (MDD), researchers explored the genetic factors underlying treatment response and resistance. They defined treatment-resistant depression (TRD) by examining electronic medical records of over 4,500 individuals in Sweden who received antidepressants and electroconvulsive therapy (ECT). TRD cases, treated with ECT after inadequate antidepressant treatment, showed a lower genetic predisposition for antidepressant response than non-TRD, although the difference was not significant; but a significantly higher genetic propensity for lithium response. This suggests a genetic link between treatment response and resistance in MDD, emphasizing the genetic profile of lithium sensitivity in TRD. By utilizing detailed treatment records, the study provides a stringent TRD definition, minimizing misclassification. The findings contribute to understanding the genetic basis of MDD treatment response and resistance, specifically highlighting the genetic explanation for lithium's efficacy in treating TRD, a crucial step toward personalized psychiatric treatments.
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Note that this paper is PREPRINT, and it has not been peer reviewed.