13 Aug 2026 (Navroze Bureau) : Psychiatric genetics is helping researchers understand why some mental-health conditions can run in families. But for an Indian family, genetic information is not a simple prediction of whether someone will or will not develop a psychiatric disorder.
Mental Illness Can Have a Genetic Component
Conditions such as schizophrenia, bipolar disorder, depression and other psychiatric illnesses can show familial patterns. But they are generally complex disorders influenced by many genetic variants as well as environmental and social factors.
A family history can therefore indicate increased vulnerability without meaning that another family member will inevitably develop the same illness.
What Genetics Can Tell a Family
Genetic information can sometimes help explain why a particular disorder appears repeatedly within a family.
In a smaller proportion of cases, rare genetic variants or copy-number changes with relatively large effects can be associated with psychiatric or neurodevelopmental conditions. Identifying such variants may help with diagnosis and family counselling in appropriate cases.
Family history itself can also be clinically useful. Genetic counselling may help relatives understand their risk more accurately and avoid unnecessary fear or fatalism. Research involving Indian mental-health professionals has found strong support for psychiatric genetic counselling.
What a Genetic Test Usually Cannot Tell
For common psychiatric disorders, there is currently no routine genetic test that can reliably tell a healthy person, “You will develop schizophrenia,” “You will develop depression,” or “You will never develop it.”
Hundreds of genetic variants can contribute to psychiatric risk, but individual variants usually have very small effects. Even when researchers combine many variants into a genetic risk score, its usefulness for predicting an individual’s future illness remains limited.
Genes Are Not Destiny
A person’s genetic vulnerability interacts with factors such as stress, trauma, physical health, substance exposure, relationships and other environmental influences.
This means that having a family history is neither a diagnosis nor a guarantee of illness. Conversely, someone without a known family history can still develop a psychiatric disorder.
Why Indian Representation Matters
Psychiatric genetics research has historically relied heavily on populations of European ancestry.
Researchers studying Indian populations have highlighted the importance of including people from India and other underrepresented ancestries because genetic findings may not always transfer equally across populations. Cross-ancestry research involving India is helping address this gap.
Should Indian Families Get Genetic Testing?
Not every family with a history of mental illness needs genetic testing.
Testing may be more relevant when there is an unusual clinical presentation, intellectual disability, autism, multiple affected relatives, a suspected genetic syndrome or other features suggesting a rare genetic cause. Professional genetic counselling can help determine whether testing is appropriate and explain what the results actually mean.
What Families Should Take Away
The most useful information for many families remains a carefully documented family psychiatric history, combined with professional assessment.
Genetics can help explain risk and vulnerability, and in selected cases identify an underlying genetic condition. But it cannot currently provide certainty about an individual’s psychiatric future.