Gas1 is a modifier for holoprosencephaly and genetically interacts with sonic hedgehog

M Seppala, M J Depew, D C Martinelli, C M Fan, P T Sharpe, M T Cobourne

Research output: Contribution to journalArticlepeer-review

115 Citations (Scopus)

Abstract

Holoprosencephaly (HPE) is a clinically heterogeneous developmental anomaly affecting the CNS and face, in which the embryonic forebrain fails to divide into distinct halves. Numerous genetic loci and environmental factors are implicated in HPE, but mutation in the sonic hedgehog (Shh) gene is an established cause in both humans and mice. As growth arrest-specific 1 (Gas1) encodes a membrane glycoprotein previously identified as a Shh antagonist in the somite, we analyzed the craniofacial. phenotype of mice harboring a targeted Gas1 deletion. Gas1(-/-) mice exhibited microform HPE, including midfacial hypoplasia, premaxillary incisor fusion, and cleft palate, in addition to severe ear defects; however, gross integrity of the forebrain remained intact. These defects were associated with partial loss of Shh signaling in cells at a distance from the source of transcription, suggesting that Gas1 can potentiate hedgehog signaling in the early face. Loss of a single Shh allele in a Gas1(-/-) background significantly exacerbated the midline craniofacial phenotype, providing genetic evidence that Sbb and Gasl interact. As human GAS1 maps to chromosome 9q21.3-q22, a region previously associated with nonsyndromic cleft palate and congenital deafness, our results establish GAS1 as a potential locus for several human craniofacial malformations
Original languageEnglish
Pages (from-to)1575 - 1584
Number of pages10
JournalJournal of Clinical Investigation
Volume117
Issue number6
DOIs
Publication statusPublished - 1 Jun 2007

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