Lifestyle Interventions May Mitigate Cardiovascular Risks from Clonal Hematopoiesis

New research indicates that consistent physical activity and healthy sleep patterns may reduce the cardiovascular risks associated with clonal hematopoiesis (CH), a condition where blood stem cells acquire DNA mutations over time. A study published June 10 in Nature suggests that while these genetic mutations predispose individuals to inflammation and heart disease, behavioral modifications can influence how these mutant cells behave, potentially lowering the risk of atherosclerosis.

What is clonal hematopoiesis and why does it impact heart health?

Clonal hematopoiesis occurs when blood stem cells develop specific DNA mutations and begin to replicate disproportionately. According to Dr. Siddhartha Jaiswal, an immunologist at Stanford University School of Medicine, these mutations are common in individuals over the age of 70, appearing in more than 10 percent of that population. While originally studied as a precursor to blood cancers, research has linked these mutations to a 30 to 40 percent increase in mortality from cardiovascular events, including heart attacks and strokes.

The mechanism involves immune cells called macrophages. Research led by scientists at the Icahn School of Medicine at Mount Sinai has shown that these mutant macrophages can intensify the inflammatory response within clogged arteries, accelerating the development of atherosclerosis. Unlike fixed genetic traits, however, the activity of these mutations appears responsive to external environmental factors.

How do sleep and exercise influence genetic risk?

Behavioral interventions appear to alter the frequency and function of mutant macrophages. In a study analyzing genetic and activity data from over 91,000 adults in the U.K. and U.S., researchers observed a 13 percent reduction in the prevalence of specific CH mutations among participants who engaged in moderate to vigorous physical activity.

Animal models provided further clarity on the biological impact of these lifestyle choices. In experiments involving mice engineered with CH mutations, those provided with exercise wheels showed reduced plaque formation in their arteries. Conversely, mice subjected to sleep disruption exhibited increased disease progression. According to Dr. Teresa Gerhardt, formerly of Mount Sinai and now leading a lab at Goethe University Frankfurt, the data suggests that while individuals cannot change their genetic code, they may be able to influence the activity of these genes through daily habits.

Are these findings applicable to all genetic variants?

The protective effects of sleep and exercise are not uniform across all gene variants associated with CH. Dr. Alan Tall, a cardiovascular researcher at Columbia University, notes that the degree to which lifestyle changes mitigate risk depends heavily on the specific mutation present. Because some of the most harmful mutations are found in 3 to 4 percent of the European population, experts suggest that even partial mitigation through lifestyle changes could benefit a significant number of people.

Key Takeaways

• Genetic Link: Clonal hematopoiesis (CH) involves DNA mutations in immune cells that increase inflammation and cardiovascular risk.
• Behavioral Impact: Data suggests that moderate to vigorous exercise and adequate sleep may lower the proportion of these mutations and reduce plaque buildup.
• Mechanism: Lifestyle changes appear to influence the behavior of macrophages, which are immune cells that otherwise exacerbate arterial plaque.
• Individual Variance: The efficacy of lifestyle interventions varies depending on the specific gene mutation, meaning risk reduction is not universal for all CH patients.

While these findings highlight a promising connection between behavior and genetic expression, they do not replace standard medical care. Patients concerned about cardiovascular health should continue to manage traditional risk factors such as cholesterol, blood pressure, and smoking, as these remain the primary drivers of heart disease and stroke.