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Updated: Nov 8, 2025

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A Diffusion-like Process Accommodates New Crypts During Clonal Expansion in Human Colonic Epithelium.

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Somatic mutations in KDM6A provide a competitive advantage, driving colorectal cancer (CRC) initiation through increased crypt fission. This process, up to a diffusion threshold, explains polyp formation and KRAS-initiated polyps.

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Area of Science:

  • Cellular dynamics in human colonic epithelium
  • Somatic mutation fixation and expansion
  • Colorectal cancer (CRC) initiation mechanisms

Background:

  • Colorectal cancer (CRC) develops from cumulative mutations in colonic crypts leading to clonal expansion.
  • Understanding somatic mutation expansion in normal epithelium is crucial for CRC initiation research.
  • This study investigates how advantaged expansions are accommodated in the human colon.

Purpose of the Study:

  • To determine how advantaged genetic expansions are accommodated in the human colon.
  • To quantify the frequencies and spatial distribution of KDM6A-mutant crypts and fission/fusion intermediates.
  • To model the dynamics of somatic mutation fixation and expansion in normal colonic epithelium.

Main Methods:

  • Immunohistochemistry to detect KDM6A loss in normal colonic epithelium.
  • Neural network-based image analysis combined with microscopy.
  • Mathematical modeling to define fixation and expansion dynamics of somatic mutations.

Main Results:

  • KDM6A-negative clones exhibit a competitive advantage and a 5-fold increase in crypt fission rate.
  • Crypt fission, not fusion, drives the expansion of advantaged mutations.
  • Mathematical modeling revealed a crypt diffusion process accommodating new crypts up to a threshold.

Conclusions:

  • Advantaged mutations, like those in KDM6A, expand via crypt fission, not fusion.
  • Crypt diffusion accommodates additional crypts until a threshold, potentially leading to polyp growth.
  • KRAS mutations' fission rate may explain KRAS-initiated polyp formation.