A landmark study identifies 71 genetic variants linked specifically to mania — and finds the genetic component to mania

In a breakthrough with significant implications for how bipolar disorder is diagnosed and treated, researchers have for the first time mapped the specific genetic architecture of mania — the defining and most dangerous feature of bipolar I disorder.

The study, published January 28, 2026, in the journal Biological Psychiatry, was led by researchers at the Institute of Psychiatry, Psychology and Neuroscience at King’s College London, in collaboration with the University of Florence.

Using data from more than 27,000 people with severe bipolar disorder and over 576,000 individuals studied for depression, the team applied an advanced statistical technique that allowed them to separate mania’s genetic signals from those associated with depression.

The result: 71 genetic variants linked specifically to mania, including 18 chromosomal regions never previously associated with bipolar disorder.

Perhaps most striking is what the findings reveal about the relationship between mania and bipolar disorder itself. The researchers found that mania accounts for more than 80% of the genetic variation that distinguishes bipolar disorder from other psychiatric conditions — meaning that genetically speaking, mania is not just a symptom of bipolar disorder. It is largely what bipolar disorder is.

Many of the identified genes are involved in voltage-gated calcium channels — biological structures essential for communication between brain cells and for regulating mood. That finding is notable because some existing medications, including lithium, are already thought to influence calcium channel function, suggesting the study may help explain why certain treatments work and point toward more precisely targeted therapies.

Mania’s genetic profile also turned out to be distinct in another unexpected way. Compared to bipolar disorder as a whole, mania showed less genetic overlap with substance use disorders and more overlap with measures related to well-being and educational attainment. That distinction could carry clinical significance for how patients are assessed and how comorbidities are treated.

The diagnostic implications are also significant. Many people with bipolar disorder first seek medical help during depressive or psychotic episodes — states that can closely resemble severe depression or schizophrenia. By identifying the specific genetic fingerprint of mania, researchers may eventually be able to develop biological tests that flag bipolar disorder earlier, before years of misdiagnosis and ineffective treatment.

For the roughly 2% of the global population living with bipolar disorder, faster and more accurate diagnosis is not a minor improvement — it is potentially life-changing.

Sources: King’s College London | MedicalXpress | EurekAlert

A note from Liam Ronan: Reading that mania accounts for 80% of what makes bipolar disorder genetically distinct hit me in a way I didn’t expect. For years, I’ve thought of mania as the disruptive part — the part that breaks things, the part I’m supposed to manage. But this study says mania isn’t just a symptom of bipolar disorder. Genetically, it practically is bipolar disorder. That reframes the whole conversation. It means the thing I’ve been fighting to suppress is part of who I am and encoded in my biology. I’m not sure yet what to do with that, but it feels important to sit with.

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