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BMC Psychiatry
Published in: BMC Psychiatry 1/2018

Open Access 01-12-2018 | Research article

Differential mitochondrial DNA copy number in three mood states of bipolar disorder

Authors: Dong Wang, Zongchang Li, Weiqing Liu, Jun Zhou, Xiaoqian Ma, Jinsong Tang, Xiaogang Chen

Published in: BMC Psychiatry | Issue 1/2018

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Abstract

Background

Accumulating evidences indicated that mitochondrial abnormalities were associated with bipolar disorder. As a sensitive index of mitochondrial function and biogenesis, Mitochondrial DNA copy number (mtDNAcn) may be involved in the pathophysiology of bipolar disorder.

Methods

Leukocyte relative mtDNAcn was measured by quantitative polymerase chain reaction in subjects with BD (n = 131) in manic, depressive, and euthymic symptoms. Thirty-four healthy individuals were used as comparison control. BD clinical symptomatology was evaluated by Young Mania Rating Scale (YMRS), Hamilton Depression Scale (HAM-D), Clinical Global Impression-Bipolar Disorder-Severity of Illness Scale (CGI-BD-S), and the Positive and Negative Syndrome Scale (PANSS).

Results

Compared to healthy controls, BD patients with manic and depressive symptoms presented significantly decreased mtDNAcn levels (p-value = 0.009 and 0.041, respectively). No significant differences were detected in mtDNAcn between euthymic patients and healthy controls. The mtDNAcn was negatively correlated with the number of relapses in manic patients (β = − 0.341, p = 0.044).

Conclusions

Our study described the first evidence of (1) a significant decline of mtDNAcn in manic BD patients, (2) a similar decreased level of mtDNAcn between manic and depressed BD patients, (3) a negative correlation of mtDNAcn with number of relapses in patients suffering from manic states. Alterations of mtDNAcn in manic and depressed patients, which may reflect disturbances of energy metabolism, supported the role of mitochondrial abnormalities in the pathophysiology of BD.
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Metadata
Title
Differential mitochondrial DNA copy number in three mood states of bipolar disorder
Authors
Dong Wang
Zongchang Li
Weiqing Liu
Jun Zhou
Xiaoqian Ma
Jinsong Tang
Xiaogang Chen
Publication date
01-12-2018
Publisher
BioMed Central
Published in
BMC Psychiatry / Issue 1/2018
Electronic ISSN: 1471-244X
DOI
https://doi.org/10.1186/s12888-018-1717-8

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