Inhibition of gap junction communication at ectopic Eph/ephrin boundaries underlies craniofrontonasal syndrome

Alice Davy, Jeffrey O. Bush, Philippe Soriano

Research output: Contribution to journalArticlepeer-review

132 Scopus citations

Abstract

Mutations in X-linked ephrin-B1 in humans cause craniofrontonasal syndrome (CFNS), a disease that affects female patients more severely than males. Sorting of ephrin-B1-positive and -negative cells following X-inactivation has been observed in ephrin-B1+/- mice; however, the mechanisms by which mosaic ephrin-B1 expression leads to cell sorting and phenotypic defects remain unknown. Here we show that ephrin-B1+/- mice exhibit calvarial defects, a phenotype autonomous to neural crest cells that correlates with cell sorting. We have traced the causes of calvarial defects to impaired differentiation of osteogenic precursors. We show that gap junction communication (GJC) is inhibited at ectopic ephrin boundaries and that ephrin-B1 interacts with connexin43 and regulates its distribution. Moreover, we provide genetic evidence that GJC is implicated in the calvarial defects observed in ephrin-B1+/- embryos. Our results uncover a novel role for Eph/ephrins in regulating GJC in vivo and suggest that the pleiotropic defects seen in CFNS patients are due to improper regulation of GJC in affected tissues.

Original languageEnglish
Pages (from-to)1763-1776
Number of pages14
JournalPLoS Biology
Volume4
Issue number10
DOIs
StatePublished - 2006
Externally publishedYes

Fingerprint

Dive into the research topics of 'Inhibition of gap junction communication at ectopic Eph/ephrin boundaries underlies craniofrontonasal syndrome'. Together they form a unique fingerprint.

Cite this