Mice with neuron-specific accumulation of mitochondrial DNA mutations show mood disorder-like phenotypes

Molecular Psychiatry
T KasaharaTadafumi Kato

Abstract

There is no established genetic model of bipolar disorder or major depression, which hampers research of these mood disorders. Although mood disorders are multifactorial diseases, they are sometimes manifested by one of pleiotropic effects of a single major gene defect. We focused on chronic progressive external ophthalmoplegia (CPEO), patients with which sometimes have comorbid mood disorders. Chronic progressive external ophthalmoplegia is a mitochondrial disease, which is accompanied by accumulation of mitochondrial DNA (mtDNA) deletions caused by mutations in nuclear-encoded genes such as POLG (mtDNA polymerase). We generated transgenic mice, in which mutant POLG was expressed in a neuron-specific manner. The mice showed forebrain-specific defects of mtDNA and had altered monoaminergic functions in the brain. The mutant mice exhibited characteristic behavioral phenotypes, a distorted day-night rhythm and a robust periodic activity pattern associated with estrous cycle. These abnormal behaviors resembling mood disorder were worsened by tricyclic antidepressant treatment and improved by lithium, a mood stabilizer. We also observed antidepressant-induced mania-like behavior and long-lasting irregularity of activity in some mut...Continue Reading

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