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Related Experiment Video

Updated: May 28, 2026

Developing a Rat Model for Bipolar Disorder

Developing a Rat Model for Bipolar Disorder

Published on: May 2, 2025

Evolutionary origin of bipolar disorder-revised: EOBD-R.

Julia A Sherman¹

¹shermanja25@yahoo.com

Medical Hypotheses

|November 1, 2011

Summary

This summary is machine-generated.

The evolutionary origin of bipolar disorder (EOBD) suggests Neandertal ancestry for susceptibility genes. This hypothesis integrates biological clock, seasonal mood shifts, and cold-adaptation theories, explaining bipolar disorder

Related Experiment Videos

Last Updated: May 28, 2026

Developing a Rat Model for Bipolar Disorder

Developing a Rat Model for Bipolar Disorder

Published on: May 2, 2025

Area of Science:

Evolutionary biology
Psychiatry
Paleogenetics

Background:

The evolutionary origin of bipolar disorder (EOBD) hypothesis links mood disorders to adaptations for severe Pleistocene climate conditions in the northern temperate zone.
The extended EOBD-R hypothesis proposes Neandertal ancestry for bipolar disorder susceptibility genes, integrating Neandertal genomic contributions.

Observation:

Bipolar disorder exhibits epidemiological patterns consistent with an adaptation.
Correlations exist between bipolar disorder, cold-adapted physical builds, and seasonal mood variations influenced by light.
Related conditions like seasonal affective disorder show biological responses to season changes, similar to hibernating animals.

Findings:

The circadian gene network is confirmed to be involved in bipolar disorder pathophysiology.
Women of reproductive age show higher winter depression incidence, aligning with evolutionary pressures and observed in hibernating mammals.
Lower incidence of bipolar disorder in individuals of African descent, who lack Neandertal genes, supports the hypothesis.

Implications:

The EOBD-R hypothesis offers a framework for identifying bipolar vulnerability genes and understanding human evolution, including Neandertal ancestry.
Confirmation could stimulate research into preventing and managing bipolar disorder through light manipulation.
A definitive test involves comparing genomic similarities between bipolar individuals, Neandertals, and modern human populations.