The short answer: Partly. Twin studies put the heritability of major depression at about 37%, and having a parent or sibling with depression raises your risk roughly two to three times. But no single gene causes it, and most of the risk comes from life experience. Many people with a depressed parent never develop depression themselves.
How much of depression is genetic?
The best-known estimate comes from a 2000 meta-analysis in the American Journal of Psychiatry by Patrick Sullivan and colleagues. They pooled five twin studies that met strict criteria. Their estimate for heritability was 37%, with a 95% confidence interval of 31% to 42%.
Heritability is easy to misread. It does not mean 37% of your personal risk is fixed at birth. It describes how much of the variation in depression across a population tracks with genetic differences.
The same analysis split out the rest of the picture:
- Shared family environment (things siblings have in common, like the same home) explained close to 0%.
- Individual-specific environment (experiences unique to each person, plus measurement error) explained about 63%.
The authors concluded that depression "does not result from either genetic or environmental influences alone but rather from both." The National Institute of Mental Health says the same thing: genetic, biological, environmental, and psychological factors all play a role.
What is my risk if a parent had depression?
The Sullivan meta-analysis also pooled five family studies. First-degree relatives of people with major depression had an odds ratio of 2.84 for depression compared with relatives of people without it. MedlinePlus Genetics summarizes this as a two to three times greater risk for anyone with an affected parent or sibling.
Myrna Weissman's team at Columbia has followed the children of depressed and nondepressed parents since 1982. In the 30-year follow-up, offspring of depressed parents had about three times the risk of major depression. The highest-risk window for a first episode was ages 15 to 25 in both groups. Onset before puberty was rare, but when it happened, it was over 10 times more likely in the high-risk children.
The 38-year follow-up, published in 2021, found the roughly threefold risk held into middle age. The high-risk children also had higher rates of anxiety disorders and substance dependence. If anxiety runs in your family as well, anxiety.md covers how the two conditions overlap.
Keep the relative risk in context. A threefold increase is real, but it is not a prediction. MedlinePlus notes that many people with an affected relative never develop depression, and many people who do develop it have no family history.
Is there a single depression gene?
No. Depression is polygenic, which means many common gene variants each add a very small amount of risk. The largest early study of this kind was a 2019 genome-wide meta-analysis in Nature Neuroscience led by David Howard. It combined data on 807,553 people, including 246,363 with depression.
The study found 102 independent genetic variants and 269 genes linked to depression. Many involved synaptic structure and neurotransmission. In a separate replication sample of over 1.3 million people, 87 of the 102 variants held up.
That many hits in that many people tells you something important. Each variant has a tiny effect. MedlinePlus puts it this way: "variations in many genes, each with a small effect, combine to increase the risk." Depression does not follow a clear inheritance pattern, the way single-gene conditions do.
Can a genetic test tell me if I will get depressed?
Not at this time. No test can tell you whether you will develop depression. The genetic variants found so far are too small in effect, one by one, to predict risk for any single person. A detailed family history is still the most useful risk marker. The Weissman team concluded that "a simple family history assessment" can flag people at long-term risk.
Pharmacogenomic tests are a different product. They look at genes that affect how your body processes certain drugs. They do not diagnose depression or predict whether you will get it.
A small number of gene-drug links are backed by FDA labeling. The FDA Table of Pharmacogenetic Associations lists citalopram, for example. People who are CYP2C19 poor metabolizers reach higher drug levels and face a higher risk of QT prolongation, so the maximum recommended dose is 20 mg.
Broader claims are another matter. In 2019, the FDA issued a warning letter to a lab marketing tests that claimed to predict responses to specific drugs, including antidepressants. The agency said it was unaware of data showing the tests helped patients or clinicians use those drugs more safely or effectively. It warned that patients and clinicians "should not rely on these tests for treatment decisions" when claims go beyond the drug labeling. Never change an antidepressant dose on your own based on a test result.
What lowers risk when depression runs in the family?
Because most of the risk is not genetic, there is real room to shift the odds. Two lines of research stand out.
- Treating the parent's depression. The STAR*D-Child study followed 151 mother and child pairs. When a mother's depression remitted after three months of medication, her children's diagnoses dropped by 11%. When it did not remit, their diagnoses rose by about 8%. Of the children with no diagnosis at the start, none whose mothers remitted gained one at three months. In the group whose mothers stayed depressed, 17% did.
- Skills-based prevention for teens. A multicenter trial in JAMA tested a group cognitive behavioral program in 316 teens of depressed parents. Over about nine months, 21.4% in the program had a depressive episode, compared with 32.7% in usual care. The benefit was strongest when the parent was not currently depressed.
MedlinePlus lists environmental factors that raise risk, including stressful life events, social isolation, substance use, and childhood abuse or neglect. Reducing those exposures matters. So does getting help early, whether for yourself or a parent. Our guide to depression treatment options compares therapy, medication, and other approaches.
What early signs should parents watch for in their kids?
If you are a parent with depression, or you grew up with one, it helps to know what depression looks like in young people. The NIMH teen depression guide lists signs such as:
- Feeling sad, anxious, worthless, or "empty" much of the time
- Losing interest in activities they used to enjoy
- Getting easily frustrated, irritable, or angry
- Pulling away from friends and family
- Falling grades
- Changes in eating or sleeping habits
- Fatigue or memory problems
- Thoughts of suicide or self-harm
Irritability often stands in for sadness in teens. Our list of depression symptoms you might not recognize covers other quiet signs. In the Weissman cohort, anxiety disorders in high-risk children often appeared earlier than depression. Early anxiety is worth raising with a pediatrician.
If anyone is thinking about suicide, call or text 988, the Suicide and Crisis Lifeline, right away.
The bottom line
Depression runs in families, and genes explain part of that. Twin studies estimate heritability at about 37%. A parent or sibling with depression raises your risk about two to three times. But no single gene causes it, no test can predict it, and most of the risk comes from life experience. Knowing your family history is useful. Tell your doctor about it, watch for early signs, and get help early. Treating a parent's depression can help the whole family.
Last updated: September 2026. This article is for informational purposes only and does not constitute medical advice. Talk to a qualified clinician about your family history, genetic testing, or any change to your treatment.