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A Novel De Novo SP6 Mutation Causes Severe Hypoplastic Amelogenesis Imperfecta
Youn Jung Kim1, Yejin Lee2, Hong Zhang3
1Department of Molecular Genetics & DRI, School of Dentistry, Seoul National University, Seoul 03080, Korea.
Abstract:
Amelogenesis imperfecta (AI) is a heterogeneous group of rare genetic disorders affecting tooth enamel formation. Here we report an identification of a novel de novo missense mutation [c.817_818delinsAT, p.(Ala273Met)] in the SP6 gene, causing non-syndromic autosomal dominant AI. This is the second paper on amelogenesis imperfecta caused by SP6 mutation. Interestingly the identified mutation in this study is a 2-bp variant at the same nucleotide positions as the first report, but with AT instead of AA insertion. Clinical phenotype was much more severe compared to the previous report, and western blot showed an extremely decreased level of mutant protein compared to the wild-type, even though the mRNA level was similar.
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