Protein Discovery Links Neurodegeneration, Cancer and DNA Repair

Researchers uncover surprising connection between TDP43 protein and fundamental DNA repair process

Mar. 15, 2026 at 6:39am

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Researchers at Houston Methodist have discovered that the TDP43 protein, previously linked to neurodegenerative diseases like ALS and dementia, also plays a key role in regulating DNA mismatch repair - a critical process for correcting errors when cells copy their genetic material. This unexpected connection suggests TDP43 dysfunction could be a unifying factor behind seemingly disparate conditions like neurodegeneration and cancer.

Why it matters

This finding positions TDP43 at the intersection of neurological diseases and cancer, two major health challenges. The overactive DNA repair triggered by abnormal TDP43 levels appears to drive cellular damage in both neurological conditions and potentially tumor formation, opening new avenues for therapeutic intervention.

The details

The researchers found that when TDP43 levels are too high or too low, the DNA mismatch repair mechanism becomes hyperactive, which can actually damage neurons and destabilize the genome, potentially increasing cancer risk. In lab models, reducing this excessive DNA repair activity partially reversed the cellular damage.

  • The research was published in Nucleic Acids Research in March 2026.

The players

Muralidhar L. Hegde, PhD

Professor of neurosurgery at the Houston Methodist Neuoregeneration Center and lead researcher on the study.

Houston Methodist

The research institution where the study was conducted.

MD Anderson Cancer Center

One of the collaborating institutions on the research team.

University of Massachusetts

One of the collaborating institutions on the research team.

UT Southwestern Medical Center

One of the collaborating institutions on the research team.

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What they’re saying

“DNA repair is one of the most fundamental processes in biology. What we found is that TDP43 isn't just another RNA-binding protein involved in splicing, but a critical regulator of mismatch repair machinery.”

— Muralidhar L. Hegde, PhD, Professor of neurosurgery at the Houston Methodist Neuoregeneration Center (Nucleic Acids Research)

What’s next

Researchers plan to further investigate the specific types of cancers most affected by TDP43 dysfunction to refine therapeutic strategies. Genetic screening for TDP43 variations could also help identify individuals at higher risk for both neurodegenerative diseases and certain cancers.

The takeaway

This discovery represents a significant step forward in understanding the complex relationship between genetics, neurodegeneration, and cancer. By positioning TDP43 as a critical link, it opens new avenues for developing personalized diagnostics and treatments targeting the DNA mismatch repair pathway.