Transcriptional Heterogeneity Predicts And Enables Clonal Selection In Ageing Haematopoiesis
As we age, our bodies undergo many changes, and our blood system is no exception. A fascinating new study sheds light on why some blood-producing cells, called hematopoietic stem cells, become more dominant than others over time. These stem cells are responsible for generating all the different types of blood cells in our bodies.
The research reveals that even before any major changes occur, there’s a natural variation in how genes are active within individual stem cells—a phenomenon known as “transcriptional heterogeneity.” This inherent variability acts as a predictor, determining which specific stem cell “clones” (groups of identical cells originating from a single cell) will be more successful and expand in an aging environment.
Essentially, the study found that certain stem cells are pre-programmed with characteristics that give them an advantage as we get older. These advantageous cells show increased activity in genes related to self-renewal, cell division, stress response, and inflammation. This “clonal selection” process, where some clones outcompete others, can reshape our blood system and, in some cases, increase the risk of developing blood cancers like acute myeloid leukemia. Understanding these early indicators could pave the way for new strategies to maintain a healthy blood system as we age and potentially prevent age-related blood disorders.
Source: link to paper