Mutation analysis of TBX22 reveals new mutation in Tunisian CPX family.
Cleft palate with ankyloglossia ( CPX; OMIM 303400) is inherited as a Mendelian semidominant X-Linked disorder. Linkage studies resulted in mapping CPX to Xq13-q 21-31 region. TBX22 was identified as causing CPX. We report a new mutation in a Tunisian family and the first Arab family with X-Linked cleft palate and ankyloglossia. The family includes 6 affected members, 4 males and 2 females. Linkage study was performed using 9 microsatellite markers surrounding the CPX locus with a maximum lod score 1.81 at theta=0 with several markers. Sequence analysis of TBX22 gene revealed a novel change c.358C>T in exon 3 (R120W) located in the T-BOX domain; this change was present in all affected members and none of the 100 controls. A second modification in exon 4 (c.559G>A) predicted to result in a nonconservative substitution (E187 K) was present in the affected members but also in 2 controls, suggesting a polymorphism which functional role cannot be excluded without further study.[1]References
- Mutation analysis of TBX22 reveals new mutation in Tunisian CPX family. Chaabouni, M., Smaoui, N., Benneji, N., M'rad, R., Jemaa, L.B., Hachicha, S., Chaabouni, H. Clin. Dysmorphol. (2005) [Pubmed]
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