RBFOX1 Gene May Explain Why Depression and Anxiety Often Overlap

A new study suggests that RBFOX1 coordinates a network of genes involved in brain development and communication, potentially helping explain why several psychiatric conditions frequently occur together

Why do depression, anxiety, irritability and neuroticism often appear together in the same person?
A new University of Barcelona study suggests that this overlap may partly arise from a shared genetic network coordinated by RBFOX1, a gene that regulates how several other genes are activated and processed in the brain.

Psychiatric disorders are conditions that affect mood, thinking, behaviour and a person’s ability to manage everyday life. They include depression, anxiety disorders, schizophrenia, bipolar disorder and other mental health conditions.(1^✔ ✔Trusted Source
Mental Disorders

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Researchers identified 19 RBFOX1-regulated genes that may contribute to vulnerability to major depressive disorder and at least one related psychiatric trait. The findings show biological overlap, but they do not mean that carrying a particular gene will inevitably cause depression or another mental health condition.

Psychiatric conditions are complex and usually arise through the combined influence of many genetic variants, life experiences and environmental factors. Rather than acting as a single “depression gene,” RBFOX1 appears to coordinate a broader network involved in brain development, communication between neurons and neurotransmission.

RBFOX1 Emerged as a Central Regulator

The researchers described RBFOX1 as functioning like an “orchestra conductor.” Instead of producing one isolated effect, it helps coordinate when and how numerous genes involved in brain function are expressed or processed.(2^✔ ✔Trusted Source
Which genes make people more susceptible to depression and other psychiatric disorders?

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Changes affecting such a central regulator could potentially influence several biological processes at once. These may include neuronal development, communication between brain cells and the regulation of chemical signalling in the brain.

This broad regulatory role may help explain why depression frequently overlaps with anxiety, irritability, neuroticism and other psychiatric traits.

Nineteen Genes Linked Depression With Related Traits

The study combined information from genome-wide association studies, predicted gene expression in the brain, molecular network analysis and research into rare genetic diseases.

This integrated approach identified 19 genes regulated by RBFOX1 that were relevant to major depression and one or more associated traits.

Among the highlighted genes were:

SP4, TCF4 and PAX6 also help regulate the activity of other genes. CADM2 has previously been linked to addiction-related and other psychiatric traits, while TCF4 has been associated with schizophrenia and insomnia. Changes involving SP4 and PAX6 have also been observed in animal models exposed to stress.

Shared Genetics May Explain Overlapping Disorders

Depression and anxiety do not usually result from one mutation with a large, predictable effect. They are considered polygenic conditions, meaning that hundreds or thousands of genetic differences may each contribute a small amount to overall susceptibility.(2^✔ ✔Trusted Source
Which genes make people more susceptible to depression and other psychiatric disorders?

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The newly identified network suggests that different psychiatric traits may partly share the same biological pathways. This could help explain why a person with depression may also experience anxiety, irritability, sleep problems or other related symptoms.

“These results provide a new insight into the biological mechanisms shared by depression and various associated disorders.” Says Cormand and Fernández.

The researchers also examined rare disorders in which larger genetic changes produce symptoms that include depression or anxiety. These findings provided additional support for the biological relevance of some of the genes identified in common psychiatric conditions.

Findings Could Support More Personalized Treatment

Understanding shared molecular pathways could eventually support more personalized approaches to mental healthcare. In the future, gene networks such as the one coordinated by RBFOX1 may help researchers develop biomarkers, classify patients according to biological patterns and identify molecular pathways that could be targeted by treatment.

A therapy acting on a shared mechanism might potentially benefit several symptoms or conditions that occur together.

However, the findings cannot currently predict who will develop depression, and they are not ready for use as a genetic screening or diagnostic test. Clinical symptoms, personal history, environmental exposure and many other factors remain central to psychiatric assessment.

More Diverse Studies Are Needed Before Clinical Use

The researchers stressed that the findings must be confirmed in additional and more diverse populations.

Future studies should also examine possible differences between men and women, particularly because depression is diagnosed more frequently among women.

Laboratory experiments are needed to determine exactly how genes such as CADM2 influence brain pathways and psychiatric vulnerability. Such functional research could help distinguish genes that merely show statistical associations from those that directly contribute to disease mechanisms.

For now, the study provides a clearer map of the shared genetic architecture underlying depression and related psychiatric traits. It highlights RBFOX1 not as a single cause, but as a potentially important coordinator within a much larger and more complex biological system.

References:

1. Mental Disorders- (https://www.who.int/news-room/fact-sheets/detail/mental-disorders )
2. Which genes make people more susceptible to depression and other psychiatric disorders?-(https://web.ub.edu/en/web/actualitat/w/genetic-orchestra-conductor)

Source-Medindia