A dermal HOX transcriptional program regulates site-specific epidermal fate

Genes Dev. 2008 Feb 1;22(3):303-7. doi: 10.1101/gad.1610508.

Abstract

Reciprocal epithelial-mesenchymal interactions shape site-specific development of skin. Here we show that site-specific HOX expression in fibroblasts is cell-autonomous and epigenetically maintained. The distal-specific gene HOXA13 is continually required to maintain the distal-specific transcriptional program in adult fibroblasts, including expression of WNT5A, a morphogen required for distal development. The ability of distal fibroblasts to induce epidermal keratin 9, a distal-specific gene, is abrogated by depletion of HOXA13, but rescued by addition of WNT5A. Thus, maintenance of appropriate HOX transcriptional program in adult fibroblasts may serve as a source of positional memory to differentially pattern the epithelia during homeostasis and regeneration.

Publication types

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

MeSH terms

  • Animals
  • Body Patterning / physiology
  • Cell Differentiation / physiology
  • Epidermis / embryology*
  • Epidermis / metabolism
  • Epigenesis, Genetic
  • Epithelium / embryology
  • Epithelium / physiology
  • Fibroblasts / cytology
  • Fibroblasts / physiology
  • Gene Expression Regulation, Developmental
  • Homeodomain Proteins / metabolism*
  • Keratins / metabolism
  • Mice
  • Proto-Oncogene Proteins / metabolism*
  • Wnt Proteins / metabolism*
  • Wnt-5a Protein

Substances

  • Homeodomain Proteins
  • Proto-Oncogene Proteins
  • WNT5A protein, human
  • Wnt Proteins
  • Wnt-5a Protein
  • Wnt5a protein, mouse
  • homeobox protein HOXA13
  • Keratins