Scientists are making progress in predicting who might develop serious heart rhythm problems years before any symptoms appear. A new study published in Nature Communications, led by researchers at Penn State College of Medicine, shows that both rare and common genetic variations work together to increase the risk of early atrial fibrillation (AFib).
AFib occurs when the heart’s upper chambers beat irregularly. Instead of contracting in a coordinated manner, they quiver rapidly, increasing the chance of blood clots forming. If a clot travels to the brain, it can cause a stroke, which is often the first sign that someone has AFib.
While aging is the primary risk factor for AFib, genetics play a role in about 20% of cases. Some families carry rare mutations that significantly raise their risk, but these mutations don’t have the same effect on everyone. The new research offers insight into why this variability exists.
The researchers examined a rare mutation in the LMNA gene alongside thousands of common genetic variations found in the general population. Although each common variation has a small effect on its own, their combined presence appears to amplify the impact of the rare mutation. Using sophisticated laboratory models derived from human blood samples, they observed how these genetic factors affected DNA structure inside heart cells. These changes disrupted genes involved in the electrical pathways that regulate the heartbeat, including those responsible for sodium entry into cells.
To validate their findings, the team analyzed data from the UK Biobank, which includes health and genetic information from over 500,000 individuals. They found that people with numerous common risk variants were much more likely to develop AFib at a younger age if they also carried the rare LMNA mutation.
This research indicates that future medical assessments may need to consider a person’s entire genetic profile instead of isolating a single mutation. Such an approach could improve predictions of who is at higher risk for early-onset AFib. Additionally, the study highlights the potential importance of testing for the LMNA gene in hereditary heart rhythm disorders. Some individuals with LMNA variants might first develop AFib before any other signs of heart disease, allowing for earlier detection and monitoring.
While these findings are primarily based on laboratory models supported by population data and do not immediately alter clinical practices, they provide a compelling explanation of how multiple genetic factors influence AFib risk. Future studies involving patients could lead to better preventive strategies, enabling early intervention to reduce stroke risk.
If you’re interested in heart health, consider reading about the best foods for a stronger heart or how oranges might help combat obesity, diabetes, and cardiovascular disease. For more health insights, check out recent articles on a simple 7-day diabetes meal plan and why adding black beans to your diet can be beneficial.
Source: Penn State College of Medicine.
