Scientists Uncover Protein Linking ALS, Dementia, and Cancer

Researchers find TDP43 protein plays critical role in DNA repair, with implications for neurodegenerative diseases and cancer

Mar. 15, 2026 at 4:59am

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Researchers at Houston Methodist have discovered that the protein TDP43, already linked to conditions like ALS and frontotemporal dementia, also plays a key role in regulating DNA mismatch repair - a process vital for both healthy cell function and cancer development. The study reveals a delicate balance, where abnormal TDP43 levels can lead to heightened DNA repair activity, potentially causing damage in neurons and increasing cancer risk across the genome.

Why it matters

This groundbreaking research establishes a surprising connection between neurodegenerative disorders and cancer, centered around the TDP43 protein. Understanding this link could lead to new targeted therapies for a range of diseases, from ALS and dementia to various cancer types.

The details

The study, published in Nucleic Acids Research, shows that TDP43 is not just involved in RNA processing, but is a critical regulator of the DNA mismatch repair system. When TDP43 levels are too low or too high, the genes responsible for DNA repair become overactive, which can be detrimental - causing damage in neurons and increasing cancer risk across the genome. Researchers also analyzed cancer databases and found a correlation between higher TDP43 levels and greater numbers of mutations in tumors.

  • The study was published on March 15, 2026.

The players

Dr. Muralidhar L. Hegde

Lead researcher at the Houston Methodist Research Institute's Center for Neuroregeneration, who led the study demonstrating TDP43's role in DNA mismatch repair.

Houston Methodist Research Institute

The institution where the groundbreaking research on the connection between TDP43, neurodegenerative diseases, and cancer was conducted.

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What they’re saying

“What we found is that TDP43 is not just another RNA-binding protein involved in splicing, but a critical regulator of mismatch repair machinery. That has major implications for diseases like ALS and frontotemporal dementia where this protein goes awry.”

— Dr. Muralidhar L. Hegde, Lead researcher (Nucleic Acids Research)

“This tells us that the biology of this protein is broader than just ALS or FTD. In cancers, this protein appears to be upregulated and linked to increased mutation load.”

— Dr. Muralidhar L. Hegde, Lead researcher (Nucleic Acids Research)

What’s next

Researchers plan to focus on developing targeted therapies to modulate TDP43 levels or activity, as well as identifying biomarkers to detect TDP43 abnormalities early in the disease process. They will also expand cancer research to investigate the role of TDP43 in various cancer types to identify potential therapeutic targets.

The takeaway

This discovery establishes a critical link between neurodegenerative conditions, cancer, and the TDP43 protein, opening up new avenues for personalized, targeted treatments that could have far-reaching implications for a range of devastating diseases.