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Updated: Jan 14, 2026

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Intestinal LKB1 Loss Drives a Premalignant Program Along the Serrated Cancer Pathway.

S F Plugge1, H Ma2, J Y van der Vaart1

  • 1Center for Molecular Medicine and Oncode Institute, University Medical Center Utrecht, Utrecht, the Netherlands.

Gastroenterology
|October 23, 2025
PubMed
Summary
This summary is machine-generated.

Loss of Serine Threonine Kinase 11 (LKB1) in intestinal cells drives a regenerative state, increasing cancer risk. This LKB1 deficiency promotes serrated colorectal cancer development, especially with further genetic changes.

Keywords:
Colorectal CancerLKB1OrganoidsPeutz-Jeghers SyndromeRegenerationSerrated Tumors

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Area of Science:

  • Gastroenterology
  • Oncology
  • Molecular Biology

Background:

  • Peutz-Jeghers syndrome (PJS) is linked to Serine Threonine Kinase 11 (LKB1) mutations, causing polyps and cancer susceptibility.
  • The role of LKB1 deficiency in epithelial tissue changes and cancer risk in PJS patients is not fully understood.

Purpose of the Study:

  • To investigate how LKB1 deficiency alters intestinal epithelial cells and contributes to cancer risk.
  • To understand the molecular mechanisms linking LKB1 loss to colorectal cancer development.

Main Methods:

  • Generated heterozygous and homozygous Lkb1-deficient mouse and human organoids using CRISPR/Cas9.
  • Utilized imaging, RNA sequencing, and growth factor dependency assays for characterization.
  • Validated findings in human PJS tissues and linked to colorectal cancer data (TCGA).

Main Results:

  • Heterozygous Lkb1 loss induces a premalignant program in intestinal cells, resembling serrated colorectal cancer.
  • This state is amplified by loss of heterozygosity, promoting regeneration and EGFR signaling.
  • LKB1-mutant signature is enriched in sporadic serrated colorectal cancer; Lkb1 deficiency cooperates with mutant Kras.

Conclusions:

  • LKB1 deficiency drives chronic intestinal cell regeneration, creating a pathway for serrated colorectal cancer.
  • Loss of heterozygosity further exacerbates this regenerative state.
  • This mechanism may explain the elevated cancer risk in Peutz-Jeghers syndrome patients.