Sox10 mutation disrupts neural crest development in Dom Hirschsprung mouse model

Nature Genetics
E Michelle Southard-SmithWilliam J Pavan

Abstract

Hirschsprung disease (HSCR, MIM #142623) is a multigenic neurocristopathy (neural crest disorder) characterized by absence of enteric ganglia in a variable portion of the distal colon. Subsets of HSCR individuals also present with neural crest-derived melanocyte deficiencies (Hirschsprung-Waardenburg, HSCR-WS, MIM #277580). Murine models have been instrumental in the identification and analysis of HSCR disease genes. These include mice with deficiencies of endothelin B receptor (Ednrb(s-l); refs 1,2) endothelin 3 (Edn3(ls): refs 1,3) the tyrosine kinase receptor cRet and glial-derived neurotrophic factor. Another mouse model of HSCR disease, Dom, arose spontaneously at the Jackson Laboratory. While Dom/+ heterozygous mice display regional deficiencies of neural crest-derived enteric ganglia in the distal colon, Dom/Dom homozygous animals are embryonic lethal. We have determined that premature termination of Sox10, a member of the SRY-like HMG box family of transcription factors, is responsible for absence of the neural crest derivatives in Dom mice. We demonstrate expression of Sox10 in normal neural crest cells, disrupted expression of both Sox10 and the HSCR disease gene Ednrb in Dom mutant embryos, and loss of neural crest d...Continue Reading

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