Scientists have identified 74 genetic regions linked to anxiety in a study of nearly 700,000 people, uncovering 39 never-before-seen DNA clues that could reshape future treatments
Genetic analysis of nearly 700,000 people finds 74 regions of the human genome linked to anxiety symptomsinclude 39 Never before associated with this conditiongiving scientists the most detailed picture yet of the biology behind one of the world’s most common mental health disorders.The international study was published in natural human behaviorled by researchers from King’s College London and Australia’s QIMR Berghofer Institute for Medical Research. It analyzes the data from 693,869 people of European ancestrymaking it the largest genome-wide association study (GWAS) ever conducted on anxiety.The researchers said the unprecedented scale of the study allowed them to detect genetic signals missed by smaller studies. Rather than finding a single “anxiety gene,” they found dozens of tiny genetic variations that together affect a person’s susceptibility to anxiety.
Largest study of anxiety genes to date
Although anxiety disorders affect hundreds of millions of people around the world, scientists know far less about their genetic basis than other mental illnesses such as depression and schizophrenia.The new study is nearly twice the size of previous anxiety GWAS studies, allowing researchers to discover more genetic links because the data set is larger.Genome-wide association studies scan the DNA of hundreds of thousands of people to identify genetic variants that occur more frequently in people with specific traits or conditions. Because mental illness is affected by many genes, each with a small effect, researchers need large data sets to make these signals statistically reliable.The result is the most comprehensive genetic map of anxiety ever produced.“Despite the public health impact of anxiety, progress in understanding its genetics lags behind that of other major mental health conditions.”The study’s senior author, Professor Thalia Elie of King’s College London, said that despite being the most common mental illness worldwide, anxiety disorders have received far less attention in genetic research.
Look at symptoms rather than diagnosis
One reason this study found more genetic regions than earlier studies was because of how anxiety was measured.Rather than classifying participants into those with or without a diagnosed anxiety disorder, the researchers measured anxiety symptom severity Cover the entire population. This allows them to cover people with symptoms ranging from everyday anxiety to severe clinical symptoms.Researchers say many people experience severe anxiety without receiving a formal diagnosis. By viewing anxiety as a continuum instead of a simple yes or no diagnosis, they retained more genetic information.The decision appears to be paying off. Early diagnosis-based research identified about three dozen genetic regions associated with anxiety. This study found 74.
Key genes linked to brain activity
The most powerful findings were two genes, PVC and SORCS3both of which have been previously linked to other mental illnesses.These genes help regulate communication between nerve cells at synapses, where brain cells exchange signals. Many of the newly discovered genetic regions are also located near genes that are highly active in brain tissue.These findings reinforce the idea that anxiety is not caused by a single defective gene. Instead, hundreds of tiny genetic influences appear to be at work along with environmental factors such as stress, trauma and life experiences.In other words, there is no single genetic switch for anxiety disorders. Each variant only slightly increases the risk.
Shared genes with physical diseases
Researchers also found significant genetic overlap between anxiety and several physical health conditions, including Heart disease, migraines and digestive disorders.They emphasize that this does not mean that anxiety causes these disorders or vice versa. Instead, some of the same genetic variants appear to increase the likelihood of developing anxiety disorders and certain medical conditions.Doctors have long observed that people with anxiety disorders often experience conditions such as migraines, cardiovascular symptoms, or irritable bowel syndrome. The study provides new biological clues that may help explain why these conditions often occur together.Scientists believe these shared genetic pathways may become an important focus of future research.
What are the practical implications of the research results?
While this study represents a significant advance, the researchers caution against exaggerating its immediate clinical impact.Common genetic variants explain only 6% Differences in anxiety symptom severity among populations. Polygenic risk score constructed using new data up to 2.9% Individual changes.This means that the findings are valuable for understanding the biology of anxiety, but cannot accurately predict whether a specific individual will develop the disorder.Researchers emphasize that environment, childhood experiences, trauma, stress and other life factors continue to play a larger role in determining a person’s mental health.The study does not pave the way for genetic tests that can reliably predict anxiety. Instead, it provides scientists with a clearer roadmap for understanding the biological processes involved.
The global burden is growing
The findings come as anxiety disorders continue to affect an increasing number of people around the world.Researchers estimate 359 million people Suffering from Anxiety Disorders Circa 2021 4.4% of global population. This number is expected to exceed Will reach 515 million by 2040the growth rate of cases exceeds the growth rate of population.Despite its widespread impact, many people still lack access to treatment. In many high-income countries, less than one-third of people with anxiety disorders receive treatment, and in low-income countries, access to treatment is even more limited.Even if treatment is available, it doesn’t work for everyone.Most of the drugs currently used to treat anxiety, including selective serotonin reuptake inhibitors (SSRIs), were developed decades ago. Psychological therapies such as cognitive behavioral therapy have helped many patients, but a significant number continue to experience symptoms despite treatment.Researchers say this reflects how little is known about the underlying biology of anxiety.
Roadmap for future treatments
Newly discovered genetic regions may help change that.Instead of relying primarily on trial and error to develop drugs, scientists now have dozens of biological targets to study.Many of the identified genes are involved in communication between brain cells, providing potential avenues for developing treatments that target the biology of anxiety rather than simply reducing symptoms.The researchers warned that the discovery would not immediately lead to new drugs. The next phase will involve laboratory studies to understand what these genes actually do within brain cells, followed by animal studies and, if promising targets emerge, clinical trials.Some of the newly discovered areas have never been linked to anxiety before, opening up entirely new directions for research.
A new chapter in the genetics of anxiety
The researchers say the study marks an important starting point, not the end of the journey.Future studies need to involve larger, more diverse populations, as the current study only included people of European ancestry. The scientists also expect a larger international data set to reveal other genetic regions linked to anxiety.Now, the study provides something anxiety research has lacked for decades: a detailed genetic map.The findings don’t claim to finally have an explanation for anxiety, but they offer researchers 74 new locations in the human genome await investigationinclude 39 Never before associated with this conditionproviding new clues to the biology of anxiety and new ways to develop better treatments.
