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The T-box transcription factor gene TBX22 is mutated in X-linked cleft palate and ankyloglossia

Abstract

Formation of the secondary palate is a complex step during craniofacial development. Disturbance of the events affecting palatogenesis results in a failure of the palate to close. As a consequence of deformity, an affected child will have problems with feeding, speech, hearing, dentition and psychological development. Cleft palate occurs frequently, affecting approximately 1 in 1,500 births; it is usually considered a sporadic occurrence1 resulting from an interaction between genetic and environmental factors2. Although several susceptibility loci have been implicated, attempts to link genetic variation to functional effects have met with little success3. Cleft palate with ankyloglossia (CPX; MIM 303400) is inherited as a semidominant X-linked disorder previously described in several large families of different ethnic origins4,5,6,7,8,9,10,11 and has been the subject of several studies that localized the causative gene to Xq21 (refs. 1013). Here we show that CPX is caused by mutations in the gene encoding the recently described T-box transcription factor TBX22 (ref. 14). Members of the T-box gene family are known to play essential roles in early vertebrate development, especially in mesoderm specification15. We demonstrate that TBX22 is a major gene determinant crucial to human palatogenesis. The spectrum of nonsense, splice-site, frameshift and missense mutations we have identified in this study indicates that the cleft phenotype results from a complete loss of TBX22 function.

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Figure 1: Candidate genes identified in the CPX interval in Xq21.
Figure 2: Mutation analysis in CPX families.
Figure 3: Alignment of the T-box domain from different T-box family members and different species.
Figure 4: Expression analysis of TBX22.

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Acknowledgements

We wish to thank R. Williamson, O. Jensson, C. Greenberg, J. Freidman, A. Ivens, S. Forbes, M. Richardson, M. Tham, V. Mandryko, L. Bentley, M.T. Ross and members of the Sanger Centre Human X Chromosome Project Team for their invaluable contributions to this study; A. Davies and S. Bayliss for DNA sequencing; the families and patients studied for their participation; and M. Parker and A.J. Copp for critical reading of the manuscript. This work was supported by the Birth Defects Foundation United Kingdom, the Dunhill Medical Trust, the Medical Research Council, the Icelandic Research Council and the Hayward Foundation.

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Correspondence to Philip Stanier.

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Braybrook, C., Doudney, K., Marçano, A. et al. The T-box transcription factor gene TBX22 is mutated in X-linked cleft palate and ankyloglossia. Nat Genet 29, 179–183 (2001). https://doi.org/10.1038/ng730

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