Novel DLX3 Variant Identified in a Family with Tricho-Dento-osseous Syndrome

Objectives: To identify DLX3 variants in a Chinese family with typical clinical manifestations of tricho-dento-osseous syndrome (TDO). Design: Sanger sequencing was performed to detect DLX3 variants in the TDO family. Three-dimensional laser scanning microscopy, bioinformatic and conformational analyses were employed to explore the phenotypic characterization and the functional impact. Results: We identified a novel heterozygous variant in the DLX3 gene (c.534G>C; p.Gln178His). Familial co-segregation verified an autosomal dominant inheritance pattern. Bioinformatic prediction demonstrated the deleterious effects of the variant, and DLX3 structure changes suggested the corresponding functional impairments.Conclusions: We identified a variant in the DLX3 gene in an integrated family of Han nationality for the first time. This study expands the variant spectrum of DLX3 and phenotype spectrum of TDO syndrome.