Clonal dynamics and somatic evolution of haematopoiesis in mouse.

Haematopoietic stem cells maintain blood production throughout life. Although extensively characterized using the laboratory mouse, little is known about clonal selection and population dynamics of the haematopoietic stem cell pool during murine ageing. We isolated stem cells and progenitors from young and old mice, identifying 221,890 somatic mutations genome-wide in 1,845 single-cell-derived colonies.