A dermal HOX transcriptional program regulates site-specific epidermal fate

JL Rinn, JK Wang, N Allen, SA Brugmann… - Genes & …, 2008 - genesdev.cshlp.org
JL Rinn, JK Wang, N Allen, SA Brugmann, AJ Mikels, H Liu, TW Ridky, HS Stadler, R Nusse
Genes & development, 2008genesdev.cshlp.org
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 …
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.
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