The heritability of mental illnessThe heritability of mental illness
All In The Mind
Genetic testing for risk of a mental illness could be helpful to its management.
29:18•30 Oct 2016
Is Mental Illness Inherited? Genetics, Family History and Hope
Episode Overview
- Mental disorders often have high heritability, but genetic risk is probabilistic rather than fixed destiny.
- Conditions such as autism, schizophrenia, bipolar disorder and ADHD can be 70–85% heritable, while depression is around 40%.
- Large DNA biobanks and global data-sharing have transformed psychiatric genetics, revealing many genetic variants linked to illness.
- Twin studies remain key to separating genetic influences from environmental factors in mental health.
- Having a parent with mental illness increases risk but does not mean you will develop an illness, especially with supportive environments and treatment.
“It is the same as having diabetes. It is not a choice. It is an illness you get and there are symptoms and there's treatment.”
How do people find strength in their journey to sobriety when mental illness also runs in the family? This episode of *All In The Mind* looks straight at that uncomfortable question: can you inherit conditions like depression, schizophrenia or anorexia, and what does that mean for your future? Journalist James Longman shares a raw account of losing his father to suicide at nine years old, then later facing his own depression and panic attacks.
With a father diagnosed with schizophrenia and a mother who lives with depression, James wrestles with whether his struggles are "because somehow there's something in me which I inherited from him" or shaped by life events and family dynamics. From there, the episode shifts into hard science. At King’s College London, psychologist Dr Cerise Gunnarsinger explains how their biobank collects DNA and clinical data from tens of thousands of volunteers.
Geneticist Dr Jerome Breen breaks down heritability in plain language: some mental health conditions such as autism, schizophrenia, bipolar disorder and ADHD can be 70–85% heritable, while depression sits closer to 40%, with the rest linked to environment. You’ll hear how twin studies helped untangle nature and nurture, why early genetic research on depression "found nothing", and how huge international collaborations are finally uncovering genetic variants for conditions like schizophrenia, depression and anorexia.
Breen stresses that genes change risk, they don’t write destiny, and future genetic tools are more likely to guide diagnosis and treatment than to label people for life. James finds comfort in seeing his depression as "the same as having diabetes" – an illness with symptoms and treatments, not a character flaw – and reflects on how a better understanding of his family history actually helps him cope.
If you’ve ever worried about mental illness running in your family, could this scientific and personal look at heritability make those fears feel a little less heavy?
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