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- W2160874148 abstract "SUMMARY Bipolar disorder (BD) is a major mood disorder with several genes of moderate or small effect contributing to the genetic susceptibility. It is also likely heterogeneous, which stimulated efforts to refine its clinical phenotype, studies investigating the link between BD susceptibility and response to a specific mood stabilizer appear to be one of the promising directions. In particular, excellent response to lithium prophylaxis has been described as a clinical marker of a more homogeneous subgroup of BD, characterized by an episodic course, low rates of co-morbid conditions, absence of rapid cycling, and a strong genetic loading. These results also suggest that lithium response clusters in families (independent of the increased familial loading for affective disorders), likely on a genetic basis. For almost 40 years, clinical studies have pointed to differences between lithium responders (LR) and non-responders (LNR). For instance, there is a higher frequency of BD in LR families. As well, investigations in offspring of LR and LNR probands show that the offspring of LR tend to manifest a higher frequency of affective disorders, less co-morbidity and an episodic course of the disorder, compared with the offspring of LNR, who had a broad range of psychopathology, a higher rate of co-morbidity and a chronic course of the disorder. A number of candidate genes have been studied in patients treated with lithium; of these, several showed an association in at least one study: cAMP responsive element binding protein (CREB), Xbox binding protein 1 (XBP-1), inositol polyphosphate-1-phosphatase (INNP1), serotonin transporter gene (5-HTT), brain-derived neurotrophic factor (BDNF), phospholipase γ-1(PLCγ-1), dopamine receptors (D2 and D4), polyglutamine tracts, tyrosine hydroxylase, inositol monophosphatase (IMPA), mitochondrial DNA, and breakpoint cluster region (BCR) gene. Clinical studies have shown as well that the treatment response and outcome appear to be specific for the different types of mood stabilizers. Patients who respond to lithium exhibit qualitative differences from patients responding to other medications, such as valproate, carbamazepine or lamotrigine. Responders to carbamazepine had atypical clinical features, such as moodincongruent psychosis, an age at onset of illness below 30 years old, and a negative family history of mood disorders. Similarly, in a study comparing the phenotypic spectra in responders to lithium versus lamotrigine the probands differed with respect to clinical course (with rapid cycling and non-episodic course in the lamotrigine group) and co-morbidity, with the lamotrigine-responder group showing a higher frequency of panic attacks and substance abuse. In conclusion, pharmacogenetic studies may provide important clues to the nature of bipolar disorder and the response to long term treatment." @default.
- W2160874148 created "2016-06-24" @default.
- W2160874148 creator A5013348661 @default.
- W2160874148 creator A5066791583 @default.
- W2160874148 date "2008-12-01" @default.
- W2160874148 modified "2023-10-18" @default.
- W2160874148 title "Genetic studies of bipolar disorder in patients selected by their treatment response" @default.
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