293 genetic variants linked to major depression identified in mega-study

An international research team has identified almost 300 new genetic variants linked to major depression. Analysis of data from 29 countries could fundamentally reshape treatment, moving towards therapies tailored far more precisely to individual patients.

What makes this new mega-study so significant

Published in the scientific journal Cell, the research is considered the largest genetic study of depression to date. Researchers examined the genomes of around 5 million people:

• 688,808 people with a diagnosis of depression
• 4.3 million control participants with no known depression
• Data from 29 countries across several continents

Around one quarter of participants were of non-European ancestry. This marks a crucial departure from many earlier studies, which looked almost exclusively at people of European descent.

The study identifies 293 previously unknown genetic variants associated with major depressive disorder – in a population more diverse than ever before.

This broad approach revealed gene variants that would have remained undetected in more narrowly balanced samples. That is precisely what makes the findings relevant to the worldwide care of people with mental illness, whether in Europe, Africa, Asia or Latin America.

Depression as a polygenic puzzle

The researchers’ work confirms one central point: depression is polygenic