Journal
CLEFT PALATE-CRANIOFACIAL JOURNAL
Volume 43, Issue 2, Pages 152-154Publisher
ALLIANCE COMMUNICATIONS GROUP DIVISION ALLEN PRESS
DOI: 10.1597/05-014.1
Keywords
craniofrontonasal syndrome; EFNB1; ephrin-B1; mutation analysis
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Craniofrontonasal syndrome (CFNS) is an X-linked disorder whose main clinical manifestations include coronal craniosynostosis and frontonasal dysplasia. Very recently, CFNS was shown to be caused by mutations in EFNB1 encoding ephrin-B1, and 20 mutations have been described. We report a Thai woman with CFNS, in whom a novel mutation was discovered: c.685_686insG, in exon 5 of EFNB1. It is the first insertion and the most 3' point mutation in EFNB1 reported to date. The mutation is expected to result in a truncated ephrin-B1 of 230 amino acids, composed of a nearly complete extracellular part of ephrin-B1 with no transmembrane and cytoplasmic domains. This truncated protein might become a soluble form of the ligand, which previously was shown to be able to bind to receptors, but fail to cluster and to activate them-in other words, acting as a dominant negative protein. Nonetheless, further studies to detect the protein are needed to substantiate the hypothesis.
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