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Development. 2015 Jun 15;142(12):2163-72. doi: 10.1242/dev.117341. Epub 2015 May 28.

Dnmt1 is essential to maintain progenitors in the perinatal intestinal epithelium.

Author information

1
Department of Genetics and Institute for Diabetes, Obesity and Metabolism, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA.
2
Department of Pathology and Immunology, Washington University School of Medicine, St Louis, MO 63110, USA.
3
Department of Genetics and Institute for Diabetes, Obesity and Metabolism, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA kaestner@mail.med.upenn.edu.

Abstract

The DNA methyltransferase Dnmt1 maintains DNA methylation patterns and genomic stability in several in vitro cell systems. Ablation of Dnmt1 in mouse embryos causes death at the post-gastrulation stage; however, the functions of Dnmt1 and DNA methylation in organogenesis remain unclear. Here, we report that Dnmt1 is crucial during perinatal intestinal development. Loss of Dnmt1 in intervillus progenitor cells causes global hypomethylation, DNA damage, premature differentiation, apoptosis and, consequently, loss of nascent villi. We further confirm the crucial role of Dnmt1 during crypt development using the in vitro organoid culture system, and illustrate a clear differential requirement for Dnmt1 in immature versus mature organoids. These results demonstrate an essential role for Dnmt1 in maintaining genomic stability during intestinal development and the establishment of intestinal crypts.

KEYWORDS:

DNA damage response; DNA methylation; Intestinal epithelial development

PMID:
26023099
PMCID:
PMC4483766
DOI:
10.1242/dev.117341
[Indexed for MEDLINE]
Free PMC Article

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