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Self-mutilation and suicide attempts are only partially overlapping behaviours, although both are predicted by mood disorder diagnosis and harm avoidance. Self-mutilation has a particularly strong association with bipolar disorder. Clinicians need to think of bipolar disorder, not borderline personality disorder, when assessing an individual who has a history of self-mutilation.

We have previously reported that the Ser9Gly dopamine D3 receptor (DRD3) polymorphism was associated with increased rates of obsessive-compulsive personality disorder (OCPD) symptomology. We tested the replicability of this association within a further two independent groups of individuals with a history of depression, from a clinical sample (n = 149) and a family study (n = 213). The data from the replication samples and the original sample, within which the association was found, were compiled within a meta-analysis. Although the independent samples did not replicate the original finding, the meta-analysis elucidated significant evidence supporting the association. An individual with Gly/Gly genotype is 2.4 (P = 0.017) times more likely to be diagnosed with OCPD. Male gender was also found to be a significant predictor of OCPD diagnosis (OR = 2.82, P = 0.001). An exploration of an association of DRD3 with Axis I anxiety disorder diagnoses and Temperament and Character Inventory (TCI) traits, in particular persistence, revealed no support for an association. We conclude that DRD3 may contribute to the development of OCPD.

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Background: It was recently reported that an interaction of the dopamine D2 receptor (DRD2) and catechol-O-methyltransferase (COMT) influences the behavioural approach system -as measured using Carver and White's Behavioural Inhibition and Behavioural Approach System (BIS/BAS) scales -in a sample of healthy German subjects. The Temperament and Character Inventory (TCI), in particular the novelty seeking (NS) and harm avoidance (HA) scales, correlates moderately with the BIS/BAS measure. This study aimed to examine support for an association of DRD2 and COMT with behavioural activation, using the TCI within two independent samples of depressed outpatients (for both samples n = 146).