Study Reveals Widespread Gene Misexpression in Healthy Individuals

A recent study conducted by researchers from the Wellcome Sanger Institute, the University of Cambridge, and AstraZeneca has discovered that gene misexpression—where genes are active when they should be inactive—is surprisingly common in healthy individuals. This phenomenon, termed "gene misbehavior," was found to affect more than half of the genes that are typically inactive.

Published in the American Journal of Human Genetics, the study provides new insights into the complexities of gene regulation and its implications for human health. The researchers analyzed blood samples from 4,568 healthy participants in the INTERVAL study, utilizing advanced RNA sequencing to measure gene activity and whole genome sequencing to identify genetic changes responsible for irregular gene activity.

The findings revealed that while misexpression events are rare at the individual gene level—occurring in only 0.07 percent of genes—96 percent of the samples exhibited some degree of misexpression. This suggests that gene misbehavior is a widespread occurrence, even in the absence of disease. The study also identified rare structural changes in DNA as one of the mechanisms behind these misexpression events.

Thomas Vanderstichele, the study's first author, emphasized the significance of these findings: “Until now, we have been looking at disease risk through the lens of highly active genes. Our study reveals ‘unusual’ gene activity is far more usual than previously thought and we need to consider the full picture, including genes that shouldn't be active but sometimes are. This is a big step towards more personalised healthcare.”

Katie Burnham, another author of the study, noted that while over half of genes occasionally misexpress, critical genes involved in development rarely do so. “This suggests that when these essential genes do misexpress, the consequences for health and disease are likely to be more severe,” she said.