Scientists discover ALS protein that links DNA repair to cancer and dementia
Why it matters: A single protein now bridges two deadly disease families, opening shared diagnostic and therapeutic avenues.
- TDP43 controls DNA mismatch repair genes, a role far beyond its known RNA‑binding functions (Houston Methodist, Nucleic Acids Research).
- Imbalanced TDP43 (too low or too high) triggers runaway repair that harms neurons and destabilizes the genome (lead investigator Muralidhar L. Hegde).
- High TDP43 levels correlate with increased tumor mutation burden across large cancer datasets, linking the protein to cancer aggressiveness.
- Therapeutic angle: dampening the excess repair activity in lab models partially rescued cellular damage, suggesting a new treatment pathway.
Houston Methodist researchers reveal that TDP43, a protein long linked to ALS and dementia, is a master regulator of DNA mismatch repair. When TDP43 is out of balance, it drives hyper‑active repair that damages neurons and fuels mutation spikes in tumors, tying neurodegeneration and cancer together.
