{
  "id": 10435943,
  "title": "TCF4 and CtBP1 Repress LEF1 to Maintain a TCF4-centric Transcriptional Program in Colon Cancer.",
  "url": "https://urgent.news/2026/09/28/tcf4-and-ctbp1-repress-lef1-to-maintain-a-tcf4-centric",
  "topic": "health",
  "section": "Health & Medicine",
  "published": "2026-09-28T00:00:00.000Z",
  "source": {
    "name": "bioRxiv",
    "slug": "biorxiv",
    "url": "https://www.biorxiv.org/content/10.64898/2026.09.25.751839v1?rss=1"
  },
  "original_language": "en",
  "account": "In the realm of colon cancer research, understanding the intricate role of transcription factors is paramount. The canonical WNT signaling pathway, instrumental in human growth and tissue homeostasis, takes on a significant role in adult tissues. Within the intestine, the WNT transcription factor, TCF4, is pivotal for maintaining stem cell function. However, when aberrantly activated in colon cancer cells, TCF4 triggers constitutive activity, steering the cell towards a malignant trajectory.\n\nInvestigating the ramifications of this key transcription factor's loss, researchers abrogated TCF4 expression in colon cancer cells, leading to over-expression of the WNT transcription factor, LEF1. This over-compensating effect was tested in a WNT reporter assay, revealing LEF1's transcriptional competence to overtake the silenced TCF4 (TCF7L2).\n\nTCF4's regulatory prowess was further elucidated, as it enlisted the transcriptional repressor CtBP1, directly binding the LEF1 promoter. This binding confirmed TCF4's direct repression of LEF1, underscoring a competitive dynamic centered on TCF4's transcriptional output, despite the saturated beta-catenin environment in colon cancer cells.\n\nThrough this study, it's clear that TCF4 holds dual activator-repressor activity in colon cancer. While TCF4 favors MYC and cell cycle progression, LEF1 steers immune-related gene signatures. This dichotomy highlights TCF4's essential role in maintaining a TCF4-centric transcriptional program.",
  "summary": "Abstract The canonical WNT signaling pathway guides cell growth throughout the human lifespan. In adults, WNT plays an essential role in tissue homeostasis by maintaining tissue stem cells. In the intestine, the WNT transcription factor, TCF4, is necessary for stem cell maintenance. Aberrant activation of WNT signaling is generally accepted as an initiating event in colon cancer, leading to…",
  "key_points": [],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}