September 3rd, 2026
Clonal hemotopoiesis is the emergence of patterns of potentially problematic mutations occurring in hematopoietic stem cells that then spread over time throughout the immune system, as these stem cells are the source of all immune cells. It is the most well studied form of the somatic mosaicism that occurs in all tissues, the spread of mutations originating in stem cell populations, with some correlational evidence for it to contribute to the development of other age-related conditions. Here researchers note that clonal hematopoiesis associates with idiopathic pulmonary fibrosis, an age related condition with causes that are poorly understood. The immune system is clearly important to health, but equally the research community is some way from fully understanding how exactly disruptive mutations cause downstream problems in tissues.
Clonal hematopoiesis (CH), defined as expanded somatic blood cell clones in persons without other hematological abnormalities, is also age related. CH at variant allele frequencies (VAF) ≥2% is associated with greater risk of chronic diseases, such as coronary heart disease or chronic obstructive pulmonary disease (COPD). Commonly mutated genes (e.g., DNMT3A and TET2) epigenetically control gene expression and are important regulators of disease-related immune responses. Given these shared risk factors, we hypothesized that incidence of CH is associated with idiopathic pulmonary fibrosis (IPF) progression.
