Mutations in Hedgehog pathway genes in fetal rhabdomyomas

Simone Hettmer, Lisa A. Teot, Paul Van Hummelen, Laura MacConaill, Roderick T. Bronson, Claudia Dall'Osso, Junhao Mao, Andrew P. McMahon, Peter J. Gruber, Holcombe E. Grier, Carlos Rodriguez-Galindo, Christopher D. Fletcher, Amy J. Wagers

Research output: Contribution to journalArticlepeer-review

30 Scopus citations


Ligand-independent, constitutive activation of Hedgehog signalling in mice expressing a mutant, activated SmoM2 allele results in the development of multifocal, highly differentiated tumours that express myogenic markers (including desmin, actin, MyoD and myogenin). The histopathology of these tumours, commonly classified as rhabdomyosarcomas, more closely resembles human fetal rhabdomyoma (FRM), a benign tumour that can be difficult to distinguish from highly differentiated rhabdomyosarcomas. We evaluated the spectrum of Hedgehog (HH) pathway gene mutations in a cohort of human FRM tumours by targeted Illumina sequencing and fluorescence in situ hybridization testing for PTCH1. Our studies identified functionally relevant aberrations at the PTCH1 locus in three of five FRM tumours surveyed, including a PTCH1 frameshift mutation in one tumour and homozygous deletions of PTCH1 in two tumours. These data suggest that activated Hedgehog signalling contributes to the biology of human FRM.

Original languageEnglish
Pages (from-to)44-52
Number of pages9
JournalJournal of Pathology
Issue number1
StatePublished - Sep 2013
Externally publishedYes


  • Fetal rhabdomyoma
  • Hedgehog signalling
  • PTCH1


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