A study conducted by the researchers at Weill Cornell Medicine, New York-Presbyterian, in collaboration with the New York Genome Center, Harvard Medical School, and Dana-Farber Cancer Institute, has revealed that a mutation in blood stem cells is associated with higher risks of blood cancer and cardiovascular disease. Spontaneous mutation can promote these diseases by altering the stem cells’ programming of gene activity and the variety of blood cells they produce.

According to the study, a significant population of circulating blood cells with the DNMT3A R882 mutation grows as a result of the blood stem cell mutation. These mutant outgrowths are regarded to constitute a very early, pre-malignant stage of cancer formation, which tends to become more prevalent as people age. However, these mutant cells usually have the same appearance and functionality as normal cells, thereby making it difficult to determine the exact molecular specifics of how they develop.

The researchers overcame this obstacle and shed light on the implications of R882 mutations in DNMT3A, the gene that is most frequently altered in blood cells. Dr. Dan Landau, an associate professor of medicine in the Division of Hematology and Medical Oncology, an associate professor of physiology and biophysics, and a member of the Sandra and Edward Meyer Cancer Center at Weill Cornell Medicine stated that these findings helped them to understand how these mutated cells outgrow normal cells and pave the way for possible future interventions targeting these cells to prevent cancer and other clonal outgrowth-related conditions.

The scientists discovered that patients with clonal outgrowths in their blood had a higher risk of cardiovascular disease. Dr. Anna Nam, assistant professor of pathology and laboratory medicine in the Department of Pathology and Laboratory Medicine, stated that the absence of "off switches" across the genome and the activation of important genes is caused by the mutation’s disruption of regular methylation. This leads to the production of mature blood cells from the mutant stem cells that are skewed toward red blood cells and the cells that produce blood-clotting platelets. 

(Source: https://theprint.in/health/study-sheds-light-on-blood-cells-precancerous-clonal-expansion/1139235/ )