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

Alice Davy1, Jeffrey O Bush, Philippe Soriano

  • 1Program in Developmental Biology, Division of Basic Sciences, Fred Hutchinson Cancer Research Center, Seattle, Washington, USA.

Plos Biology
|September 14, 2006
PubMed

Insights

Mutations in ephrin-B1 cause craniofrontonasal syndrome (CFNS). This study reveals ephrin-B1 regulates gap junction communication (GJC), linking CFNS defects to impaired GJC in neural crest cells.

Area of Science:

  • Developmental Biology
  • Cell Biology
  • Genetics

Background:

  • X-linked ephrin-B1 mutations cause craniofrontonasal syndrome (CFNS), with females more severely affected.
  • Cell sorting occurs in ephrin-B1(+/-) mice post-X-inactivation, but mechanisms are unclear.

Purpose of the Study:

  • Investigate the mechanisms linking mosaic ephrin-B1 expression to cell sorting and CFNS phenotypes.
  • Determine the role of ephrin-B1 in calvarial development and its connection to GJC.

Main Methods:

  • Analysis of calvarial defects in ephrin-B1(+/-) mice.
  • Tracing the origin of defects to neural crest cell autonomous phenotypes.
  • Investigating the interaction between ephrin-B1 and connexin43 (Cx43).
  • Assessing gap junction communication (GJC) at ectopic ephrin boundaries.

Main Results:

  • Ephrin-B1(+/-) mice display calvarial defects linked to impaired osteogenic precursor differentiation.
  • Gap junction communication (GJC) is inhibited at ectopic ephrin boundaries.
  • Ephrin-B1 interacts with connexin43, regulating its distribution and affecting GJC.
  • Genetic evidence implicates GJC in the calvarial defects of ephrin-B1(+/-) embryos.

Conclusions:

  • Eph/ephrins play a novel role in regulating GJC in vivo.
  • Improper GJC regulation in affected tissues may underlie the pleiotropic defects in CFNS patients.

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