Researchers have discovered a previously unknown mechanism that allows cells to deliver energy directly from mitochondria to the nucleus, challenging the long-standing assumption that cellular fuel simply diffuses throughout the cell.The study, led by scientists including Ivan Menéndez-Montes and Hesham A.Sadek, found that mitochondria physically attach to nuclear pores, specialized openings in the nuclear membrane.

This direct contact appears to provide the nucleus with the ATP it needs to perform energy-intensive tasks such as gene regulation, DNA replication, and chromatin organization.

Using microscopy and protein analysis, the team identified a specific interaction between proteins on the mitochondrial surface and proteins associated with nuclear pores.

Experiments showed that even a tiny increase in the distance between mitochondria and the nucleus dramatically reduced the nucleus's available energy, despite the mitochondria continuing to function normally elsewhere in the cell.To test the biological importance of this connection, researchers disrupted the protein interaction in cells and mice.Although mitochondrial energy production remained intact, the loss of the delivery pathway caused severe developmental defects.Mouse embryos lacking the connection failed to survive to birth and exhibited major abnormalities in the heart and nervous system.

The researchers also observed these mitochondrial-nuclear contacts across multiple cell types, suggesting that the mechanism is widespread among complex organisms.Published in Nature, the findings indicate that the nucleus relies on a dedicated energy delivery system rather than passive diffusion.

The discovery could have important implications for understanding diseases linked to cellular energy regulation, including heart disease, cancer, aging, and developmental disorders.