TFAM is required for maturation of the fetal and adult intestinal epithelium

Dev Biol. 2018 Jul 15;439(2):92-101. doi: 10.1016/j.ydbio.2018.04.015. Epub 2018 Apr 22.


During development, the embryo transitions from a metabolism favoring glycolysis to a metabolism favoring mitochondrial respiration. How metabolic shifts regulate developmental processes, or how developmental processes regulate metabolic shifts, remains unclear. To test the requirement of mitochondrial function in developing endoderm-derived tissues, we genetically inactivated the mitochondrial transcription factor, Tfam, using the Shh-Cre driver. Tfam mutants did not survive postnatally, exhibiting defects in lung development. In the developing intestine, TFAM-loss was tolerated until late fetal development, during which the process of villus elongation was compromised. While progenitor cell populations appeared unperturbed, markers of enterocyte maturation were diminished and villi were blunted. Loss of TFAM was also tested in the adult intestinal epithelium, where enterocyte maturation was similarly dependent upon the mitochondrial transcription factor. While progenitor cells in the transit amplifying zone of the adult intestine remained proliferative, intestinal stem cell renewal was dependent upon TFAM, as indicated by molecular profiling and intestinal organoid formation assays. Taken together, these studies point to critical roles for the mitochondrial regulator TFAM for multiple aspects of intestinal development and maturation, and highlight the importance of mitochondrial regulators in tissue development and homeostasis.

Keywords: Intestinal development; Intestinal stem cells; Mitochondria; TFAM.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Cell Culture Techniques / methods
  • Cell Self Renewal / physiology
  • DNA-Binding Proteins / genetics
  • DNA-Binding Proteins / metabolism*
  • DNA-Binding Proteins / physiology*
  • Fetus / metabolism
  • Gene Expression Regulation / genetics
  • Glycolysis / genetics
  • Glycolysis / physiology
  • High Mobility Group Proteins / genetics
  • High Mobility Group Proteins / metabolism*
  • High Mobility Group Proteins / physiology*
  • Intestinal Mucosa / embryology
  • Intestinal Mucosa / growth & development
  • Intestinal Mucosa / metabolism*
  • Mice
  • Mitochondria / metabolism
  • Mitochondrial Proteins / genetics
  • Organogenesis / genetics
  • Organogenesis / physiology
  • Organoids / metabolism
  • Stem Cells / metabolism
  • Transcription Factors / metabolism


  • DNA-Binding Proteins
  • High Mobility Group Proteins
  • Mitochondrial Proteins
  • Tfam protein, mouse
  • Transcription Factors