A glycogen synthase kinase 3-beta promoter gene single nucleotide polymorphism is associated with age at onset and response to total sleep deprivation in bipolar depression

Neuroscience Letters
Francesco BenedettiEnrico Smeraldi

Abstract

The molecular mechanisms driving the biological clock in the suprachiasmatic nucleus of the hypothalamus may play a role in mood disorders. A single nucleotide polymorphism (SNP) (-50T/C) falling into the effective promoter region (nt -171 to +29) of the gene coding for glycogen synthase kinase 3-beta (GSK3-beta) has been linked with different age at onset of bipolar illness. GSK3-beta codes for an enzyme which is a target for the action of lithium and valproic acid, and the inhibition of which causes antidepressant-like behaviors in a preclinical model. We studied the effect of this polymorphism on the acute response to total sleep deprivation of 60 depressed bipolar type I inpatients. Homozygotes for the mutant allele of GSK3-beta promoter (-50T/C) SNP showed a later onset of bipolar illness, and better acute effects of TSD treatment on perceived mood (as rated on VAS). Overall, these observations suggest a protective role for this genotype in respect to bipolar illness. Results warrant interest for the variants of genes pertaining to the molecular clock as possible endophenotypes of bipolar disorder, and for GSK3-beta as a target of a new class of antidepressant drugs, but caution ought to be taken in interpreting these prel...Continue Reading

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