![\"\"](\"https:\/\/www.newsbeep.com\/ie\/wp-content\/uploads\/2026\/05\/low-res-14.jpeg\" "\\"Study")
The 700-million-year history of our blood cells. Credit: KyotoU \/ Yosuke Nagahata<\/p>\nA new study from Kyoto University in Japan has revealed that the blood pumping through our bodies is actually an ancient inheritance.<\/p>\n
Scientists have reconstructed a massive, 700-million-year-old family tree for blood cells by tracking genetic blueprints across species. The stunning takeaway? The way cells mature in our marrow today mirrors exactly how they evolved from single-celled ancestors millions of years ago.<\/p>\n
To uncover this, a new analytical method was designed to compare gene expression profiles across diverse animal lineages and unicellular organisms. They wanted to know when blood cells first originated, and how they branched into the specialized defenders we rely on today.<\/p>\n
The answers were written in our DNA.<\/p>\n
The 700-million-year history of our blood cells. Credit: KyotoU \/ Yosuke Nagahata<\/p>\n
Ancient genetic inheritance<\/p>\n
The team tracked a specific gene called FOS<\/a> \u2014 which is common to modern blood cells \u2014 all the way back to a single-celled organism that lived 700 million years ago.\u00a0<\/p>\n This timeline coincides perfectly with the dawn of multicellular animals. When those ancient, single-celled organisms began banding together to form the very first animals, they didn\u2019t start from scratch. But repurposed their old genetic material to invent the first blood cells.<\/p>\n Among all human blood cells<\/a>, macrophages most closely resemble those ancient, single-celled ancestors. Macrophages<\/a> are the heavy lifters that engulf debris and pathogens. This strongly suggests that the planet\u2019s first blood cells were essentially macrophage-like scouts.<\/p>\n From there, evolution got creative.<\/p>\n Using their new mapping technique, the scientists watched the family tree branch out over deep time. First, mast cells branched away from the early macrophages. Later, those mast cells split again, giving rise to red blood cells and prototypic T cells. Meanwhile, prototypic B cells made their own separate exit from the macrophage line.<\/p>\n Every time our body creates new blood cells, it rewinds the clock and repeats this epic, 700-million-year journey.<\/p>\n \u201cI feel deeply moved by these findings, which represent the culmination of our work and illustrate that the differentiation pathways of vertebrate blood cells reflect the 700-million-year evolutionary history of these cells,\u201d said<\/a> Hiroshi Kawamoto, team leader.\u00a0<\/p>\n First author Yosuke Nagahata, now based at the Institute of Evolutionary Biology in Spain, agreed. \u201cWhen I let it sink in that this legacy from so long ago is circulating within my body as blood<\/a> cells, I feel closer to our distant ancestors.\u201d<\/p>\n Genetic blueprint to fight disease<\/p>\n The study reveals that the circulating blood and immune cells in our bodies are essentially a successful, living continuation of the genetic legacy passed down by our ancient single-celled ancestors.<\/p>\n