SNPMiner Trials by Shray Alag

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Report for Clinical Trial NCT00879307

Developed by Shray Alag, 2020.
SNP Clinical Trial Gene

Brain Derived Neurotrophic Factor as a Predictor of Response to Treatment in Bipolar Depression and Mania: 16-weeks Follow-up With Quetiapine XR

There is sound evidence that quetiapine is effective in the treatment of manic and depressive episodes associated with Bipolar Disorder (BD) (Yatham et al 2006). However, even with the development of effective new treatment options, not all patients respond to treatments available. Biological markers have been investigated as predictors of response to treatment and of remission of symptoms. This would explain in part the individual's differences in the response to treatment, taking into account the genetic variability plus environmental factors influencing specific biological markers. A potential biological marker of response to treatment in BD would be the levels of neurotrophins, as they are, in fact, altered during acute mood episodes (Cunha et al 2006). Among neurotrophins, the Brain-Derived Neurotrophic Factor (BDNF) has been repeatedly and consistently reported to be associated with BD physiopathology (Post 2007). Furthermore, medications that are known to be effective in BD, like lithium and divalproex, increase BDNF levels.

MeSH:Depression Bipolar Disorder
HPO:Bipolar affective disorder Mania

1 Interventions

Name: quetiapine

Description: Use of quetiapine for 16 weeks in acute mania and depression
Type: Drug
Group Labels: 1


Primary Outcomes

Measure: Efficacy of quetiapine as a treatment for acute mania and depression, and of as a manutence treatment.

Time: 16 weeks

Secondary Outcomes

Measure: Assess the pharmacodynamics of quetiapine by neurotrophins in blood samples.

Time: 16 weeks

Purpose: Treatment

Allocation: N/A

Single Group Assignment

There is one SNP


1 V66M

Interestingly, a single nucleotide polymorphism at nucleotide196 (G/A) in the human BDNF gene at codon 66 (Val66Met) have been reported to be associated with a predisposition to BD in family-based studies (Rybakowski et al 2006, Green et al 2006). --- Val66Met ---

Furthermore, there are consistent findings in BD regarding the association of Val66Met polymorphism of BDNF gene with prefrontal cognitive impairment, which was recently confirmed in a large sample of bipolar subjects (Rybakowski et al 2006). --- Val66Met ---

In addition, crosssectional studies showed that the polymorphism of BDNF gene (Val66Met) was associated with response to lithium prophylaxis, but findings were not universal (Rybakowski et al 2005, Masui et al 2006). --- Val66Met ---

We also aim to investigate the polymorphism of BDNF gene (Val66Met) and its correlation with BDNF serum levels and treatment response. --- Val66Met ---

HPO Nodes