Broad Institute Researchers Identify Molecular Scars From Chronic Inflammation That Prime Gut Tissues for Future Cancer Growth

Broad Institute scientists find that chronic inflammation leaves epigenetic scars in the gut, priming cells for faster tumor growth later in life.

By: AXL Media

Published: Mar 26, 2026, 9:41 AM EDT

Source: Information for this report was sourced from Broad Institute of MIT and Harvard

Uncovering the Invisible Architecture of Disease Progression

The link between chronic inflammation and oncogenesis has long been observed, but the precise mechanism of how temporary irritation translates into long-term malignancy remained elusive until now. Scientists at the Broad Institute have identified that colitis leaves behind molecular "scars" within the epigenome of gut tissues. Even after physical healing appears complete, these scars remain embedded in the cellular memory, functioning as an accessible blueprint for future disease. This discovery suggests that a cell’s history of exposure is just as critical as its current state in determining health outcomes.

The Multi Generational Transmission of Cellular Trauma

The study utilized advanced tracking methods to observe how these epigenetic changes are handed down from parent cells to their descendants. Researchers found that stem cells with the strongest memory of prior inflammation pass these instructions to "daughter" cells through numerous rounds of division. This process ensures that the heightened risk remains present in the tissue long after the initial inflammatory event has subsided. According to senior author Jason Buenrostro, these changes represent the missing piece in our understanding of how early-life environmental exposures can dictate cancer risk decades later.

A Two Hit Hypothesis for Accelerated Tumor Growth

To test the impact of these molecular scars, the research team introduced cancer-promoting mutations into tissues both with and without a history of inflammation. The results were stark, as tissues harboring epigenetic memory developed larger tumors at a significantly faster rate. This "one-two punch" model suggests that the epigenetic change acts as the first hit, making the genome more accessible and vulnerable. When a second hit in the form of a genetic mutation occurs, the primed cell is already optimized for rapid growth, effectively kickstarting the transition to a malignant state.