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0This study introduces Mitotrek, a novel computational framework that utilizes mitochondrial DNA mutations to track the ancestral lineages of innate immune cells in cancer patients. By analyzing these genetic markers alongside chromatin accessibility, researchers discovered that the specialized roles of tumor-infiltrating monocytes are often predetermined in the blood before they even enter the tumor site. The data reveal that while local tumor signals trigger general cell maturation, the specific decision to become a dendritic cell or a macrophage is guided by epigenetic programming established in the peripheral circulation. Unlike adaptive immune cells that multiply within the tumor, the innate immune landscape is maintained by a constant influx of these pre-programmed cells from the bone marrow and blood. This high-resolution atlas provides a foundational tool for understanding how immunotherapies might influence immune cell development across different body compartments. This research successfully clarifies the developmental trajectories of myeloid cells, shifting the focus from local tissue cues to systemic immune dynamics.
References:
Brivanlou A, Hacohen N. Attack of the clones: Tracing the dynamics of innate immune cells in human cancer[J]. Cancer Cell, 2026.
