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The mitochondrial genome and psychiatric illness
Rebecca E S Anglin1, Michael F Mazurek, Mark A Tarnopolsky
1Department of Psychiatry & Behavioural Neurosciences, McMaster University, Hamilton, Ontario, Canada. rebecca.anglin@gmail.com
Summary
Mitochondrial defects may contribute to psychiatric disorders like bipolar disorder and schizophrenia. However, current evidence is inconsistent, requiring more rigorous research to confirm the role of mitochondrial dysfunction in mental illness.
Area of Science:
- Neuroscience
- Genetics
- Cell Biology
Background:
- Psychiatric disorders represent a significant global health burden with unclear causes.
- Genetic factors for major psychiatric conditions like bipolar disorder and schizophrenia remain largely elusive.
- Mitochondrial dysfunction is emerging as a potential contributor to psychiatric pathophysiology.
Purpose of the Study:
- To review existing literature on the role of mitochondria in adult psychiatric disorders.
- To evaluate the evidence linking mitochondrial genome defects to mental illness.
- To identify research gaps and methodological limitations in current studies.
Main Methods:
- Comprehensive literature search of MEDLINE, PsycINFO, and EMBASE databases up to September 2011.
- Inclusion of clinical, genetic, ultrastructural, and biochemical studies.
- Review of reference lists from identified articles for additional relevant studies.
Main Results:
- Clinical studies indicate psychiatric symptoms can be primary features of mitochondrial disorders.
- Limited and inconsistent evidence exists for mitochondrial DNA haplogroups and nuclear gene polymorphisms in psychiatric illness.
- Methodological limitations and lack of replication plague many studies investigating mitochondrial abnormalities in psychiatric disorders.
Conclusions:
- Mitochondrial dysfunction and genetic variations show potential involvement in psychiatric disorders.
- Current evidence is insufficient to draw definitive conclusions due to study limitations.
- Further methodologically rigorous and well-powered research is essential to clarify the role of mitochondria in mental illness.
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