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HAT1 Regulates Intestinal Stem Cell Proliferation and Differentiation.

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Histone acetyltransferase HAT1 is crucial for intestinal stem cell (ISC) function. Its loss disrupts ISC renewal and differentiation, causing intestinal defects and altering chromatin structure.

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Area of Science:

  • Cell Biology
  • Genetics
  • Gastroenterology

Background:

  • Stem cells maintain tissue integrity, with intestinal stem cells (ISCs) generating the intestinal lining.
  • Histone acetyltransferase 1 (HAT1) is expressed in ISCs and progenitor cells within intestinal crypts.
  • HAT1 acetylates histone H4 during chromatin assembly.

Purpose of the Study:

  • To investigate the role of HAT1 in intestinal stem and progenitor cell function.
  • To determine the impact of HAT1 loss on intestinal morphology, cell proliferation, and differentiation.

Main Methods:

  • Generated an inducible deletion of the HAT1 gene in mouse intestinal epithelial cells.
  • Analyzed intestinal morphology, crypt structure, and cell populations (OLFM+, Goblet, Paneth cells).
  • Performed genome-wide analysis of HAT1-dependent H4K5ac and histone modifications in intestinal crypt cells; utilized organoid cultures.

Main Results:

  • Loss of HAT1 caused morphological defects in the small intestine, including elongated crypts and increased stem/progenitor cell proliferation.
  • HAT1 deficiency led to altered ISC differentiation, with more Goblet cells and mislocalized Paneth cells.
  • HAT1 is essential for H4K5ac in ISCs, particularly in lamina-associated domains (LADs), and its loss increases H3K9 tri-methylation.
  • HAT1 is required for differentiation and Lgr5+ stem cell maintenance in intestinal organoids.

Conclusions:

  • HAT1 is essential for regulating intestinal stem cell renewal and differentiation.
  • HAT1 plays a critical role in maintaining intestinal epithelial homeostasis through epigenetic regulation.
  • Targeting HAT1 may offer therapeutic potential for intestinal disorders involving stem cell dysfunction.