The Assumption
When we talk about how a parent’s mental health shapes a child, we tend to picture something behavioral. We might picture a father who withdraws or struggles to be present, or who models a particular relationship with sadness or anxiety that his children absorb over years of watching him. A review published this month in Neurobiology of Disease suggests it’s significantly incomplete (Ren and colleagues, 2026).
The mechanisms by which a father’s depression reaches his children are behavioral and also biological, and some may operate before a child is born. At least one may begin before conception.
The Difference Between Paternal and Maternal Depression
Research on how parental depression transmits to offspring has focused almost entirely on mothers. That focus makes sense: maternal depression operates directly through pregnancy, via the placenta, through hormonal environments that shape fetal development in real time. Those pathways are well-mapped.
Paternal depression is different; it has no direct biological channel during pregnancy; offspring of depressed fathers face a 42 percent elevated risk of developing depression themselves, a figure drawn from meta-analytic evidence across more than 7 million father-child pairs. The new review asks what might account for that increased risk, and how those effects could be transmitted.
Three Mechanisms
The most straightforward mechanism involves epigenetics. Depression in fathers is associated with measurable changes to chemical tags on DNA, modifications that switch genes on or off without altering the underlying sequence. These findings raise the possibility that aspects of a father’s mental health may be reflected in biological signals present around conception.
Then there is HPA axis dysregulation. The hypothalamic-pituitary-adrenal axis governs the body’s stress response, and dysregulation of this system has been associated with paternal depression. That disrupted stress regulation can be transmitted to offspring through multiple routes, influencing how offspring develop their own stress-response systems.
Depression is also associated with significant changes in the gut microbiome, and emerging evidence suggests those microbial signatures can be passed from fathers to offspring, contributing to neurodevelopment through the gut-brain axis.
These mechanisms are different from the behavioral pathways researchers have traditionally focused on. Some may operate before a child has any conscious experience of their father’s depression.
In Practice
The distinction matters because screening and support for perinatal mental health overwhelmingly target mothers. That reflects the direct biological exposure of the fetus to maternal mental state. If paternal depression has its own biological pathways to offspring, then treating it only as a secondary concern may leave some risk unaddressed.
A father’s mental health may therefore deserve a more central place in how we think about his child’s neurodevelopment. The review’s authors advocate explicitly for a dual-parental, family-centred approach to prevention and intervention, one that addresses paternal depression not as an add-on to maternal care but as an independent pathway with independent consequences.
Elevated risk of depression does not mean that children will develop depression. Genetics, epigenetics, and microbiome signatures interact with environment, care, and support across a lifetime. It does, however, give clinicians another reason to take paternal mental health seriously—a part of care that has historically received less attention.