Department of Pediatrics, University of Iowa, Iowa City, Iowa 52242, USA. jeff-murray@uiowa.edu
Genetic defects responsible for cleft lip and cleft palate are only now beginning to be uncovered. Mutations in the gene encoding a T-box transcription factor have been identified as the cause of the rare X-linked syndrome cleft palate with tongue-tie. And in another study, heterozygotes for a defective allele for a cell adhesion molecule, which is responsible for a rare clefting syndrome when homozygous, have been found at higher than expected incidence in sporadic forms of clefting.
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