Dental implications in Hajdu-Cheney syndrome: A novel case report and review of the literature

Abstract

Objective: To identify the molecular genetic etiology of an individual with a dysmorphic face, unusual teeth mobility, and root resorption.

Subjects and methods: DNA samples were collected from a trio of family members, and whole-exome sequencing was performed.

Results: Mutational analysis revealed a de novo mutation (c.6787C>T) in the last exon of the NOTCH2 gene. This mutation would introduce a premature stop codon [p.(Gln2263*)] and generate a truncated protein without C-terminus, escaping from the nonsense-mediated decay system. Sanger sequencing confirmed that this mutation was generated spontaneously.

Conclusions: In this study, we identified a novel nonsense mutation in the last exon of the NOTCH2 gene causing Hajdu-Cheney syndrome. We described the genotype and phenotype correlation and the related dental complications. These results will advance the understanding of the NOTCH2 signaling in periodontitis and root resorption.

Keywords: NOTCH2; genetic diseases; hereditary; root resorption; tooth.