Urorectal septum malformation sequence: Insights into pathogenesis

Teri Jo Mauch, Kurt H. Albertine

Research output: Contribution to journalArticlepeer-review

38 Scopus citations


We characterize the urorectal septum malformation sequence (URSMS) in discordant fetal lambs and relate it to the human syndromes with which URSMS is associated. We found abnormal external genitalia, imperforate anus, and fistulous connections between the rectum, bladder, and vagina. Discordance among the dizygous twins eliminated teratogens as a likely etiologic factor. We summarize the relevant literature and propose a molecular model for the pathogenesis of the URSMS, in which alterations in sonic hedgehog and homeobox genes lead to caudal mesodermal deficiency during blastogenesis.

Original languageEnglish (US)
Pages (from-to)405-410
Number of pages6
JournalAnatomical Record
Issue number4
StatePublished - Dec 1 2002
Externally publishedYes


  • Blastogenesis
  • Cloaca
  • Hox
  • Imperforate anus
  • Malformation
  • Retinoic acid
  • Sheep
  • Shh
  • Urorectal septum

ASJC Scopus subject areas

  • Anatomy
  • Agricultural and Biological Sciences (miscellaneous)


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