New Research Identifies Persistent Epigenetic Memory in Colon Stem Cells That Accelerates Tumor Growth After Colitis

Nature study finds colonic stem cells retain an epigenetic memory of inflammation that lowers the threshold for tumor growth long after colitis resolves.

By: AXL Media

Published: Mar 30, 2026, 4:09 AM EDT

Source: Information for this report was sourced from Nature

The Hidden Molecular Legacy of Chronic Intestinal Inflammation

Scientific understanding of the link between chronic inflammation and malignancy has taken a significant leap forward with the discovery of "epigenetic memory" in the gut. According to a new study published in Nature, colonic stem cells do not simply return to a baseline state after a flare-up of colitis subsides. Instead, they retain structural changes in their DNA that persist for months, effectively acting as a hidden molecular record of past injury. This research provides a mechanistic explanation for why patients with inflammatory bowel disease, or IBD, remain at a higher risk for colorectal cancer even when they are in clinical remission. By using high-resolution single-cell tracking, investigators have shown that the colon’s regenerative cells are fundamentally reshaped by inflammatory stress in ways that favor future oncogenic development.

Advanced SHARE-TRACE Assays Map the Epigenetic Landscape

To uncover these deep-seated cellular changes, researchers developed a novel investigative tool called the SHARE-TRACE assay. This technology allows scientists to simultaneously profile gene expression and chromatin accessibility while tracing the lineage of individual cells. The study analyzed tens of thousands of single cells from mouse models of chronic colitis, focusing on the state of the genome more than 100 days after the resolution of active disease. The findings revealed that while the transcriptome—the set of active gene instructions—mostly returned to normal, the epigenome remained "scarred." Specifically, certain regions of the DNA became more accessible or "open," particularly at sites controlled by the activator protein 1 (AP-1) transcription factor, creating a primed state for rapid cell division.

AP-1 Transcription Factors as Drivers of Tumor Outgrowth

The study identified the AP-1 transcription factor as a central player in maintaining this inflammatory memory. In colonic stem cells that had recovered from colitis, there was a cumulative gain in accessibility at AP-1 binding sites. This structural shift does not necessarily change the cell's function under healthy conditions, but it dramatically lowers the threshold for malignant growth. When an oncogenic mutation eventually occurs, these "primed" cells are able to exploit their pre-opened chromatin to accelerate the formatio...