Selective Mitochondrial Inheritance Links Metabolism to Cell Fate: Preclinical Findings

Synopsis

This study discovered that the age of mitochondria—the cell’s energy-producing structures—plays a major role in determining how stem cells divide and develop. In epithelial stem-like cells, older mitochondria are more efficient at generating energy through oxidative respiration, while newly made mitochondria are less mature and rely on different metabolic pathways. When a stem cell divides, one daughter cell inherits older mitochondria, giving it more oxidative activity that pushes it toward differentiation (specialization). The other cell receives newer mitochondria, which support pentose phosphate pathway activity, helping maintain redox balance and stemness. Treatment with the NAD+ precursor nicotinamide riboside (NR) can boost redox capacity and support stem cell self-renewal, though it does not eliminate the inherent differences between cells with older versus newer mitochondria. These findings reveal how mitochondrial age, metabolism, and NAD+ levels work together to guide cell fate decisions.

Journal

Nature Cell Biology