Imagine unlocking the secrets of diseases that have puzzled scientists for decades, hidden within ancient medical tissues. But here's the catch: DNA degrades over time, making it nearly impossible to study samples older than 20 years with traditional methods. This limitation has left a gaping hole in our understanding of how diseases evolve and why some, like colorectal cancer, have become more prevalent among younger adults. And this is the part most people miss: the answers might be buried in century-old tissues, waiting to be rediscovered.
Researchers at the University of Chicago have pioneered a groundbreaking approach to revive DNA from historic medical samples, borrowing techniques originally designed for ancient archaeological DNA. By adapting these methods, they’ve successfully extracted genetic information from tissues collected as far back as 1932. Their focus? Colorectal cancer, a disease that has mysteriously doubled in likelihood for 35-year-olds since 1985. But here's where it gets controversial: Could the rise in this cancer be linked to changes in our microbiome or other environmental factors over time? The team’s findings, set to be unveiled at the Association for Molecular Pathology (AMP) 2025 Annual Meeting & Expo in Boston, suggest that the answer might lie in the bacteria found within these tumors.
To achieve this, the researchers meticulously isolated tumor tissue from formalin-fixed, paraffin-embedded specimens—a process that required removing wax and preservatives to salvage usable DNA. They then employed custom digital tools, typically reserved for ancient DNA analysis, to piece together fragmented genetic material and map it to the human genome. Here’s the twist: When analyzing non-human DNA in the samples, they discovered not only common gut bacteria but also species specifically associated with colon cancer. This raises a provocative question: Have shifts in our microbiome over the decades contributed to the changing face of this disease?
Dr. Alexander Guzzetta, who led the project alongside ancient DNA expert Maanasa Raghavan, emphasizes the broader implications of this work. While their current focus is on colorectal cancer, Guzzetta hopes this method will inspire other researchers to explore how diseases like diabetes, heart disease, or even infectious illnesses have evolved over time. But here’s the bold part: What if this approach doesn’t just help us understand the past, but also predicts future disease trends by uncovering hidden patterns?
The team’s findings will be presented on November 13 at 2:45 p.m. Eastern time at the Thomas M. Menino Convention and Exhibition Center in Boston, with a poster (TT008) available for deeper exploration. Guzzetta will be on hand to discuss the work and its potential to revolutionize our understanding of disease evolution. Now, here’s the question for you: Do you think this method could fundamentally change how we study and treat diseases? Or is it just another tool in the medical toolbox? Let us know in the comments—we’d love to hear your thoughts!
