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Dental agenesis is one of the most common congenital craniofacial abnormalities. Dental agenesis can be classified, relative to the number of missing teeth (excluding third molars), as hypodontia (1 to 5 missing teeth), oligodontia (6 or more missing teeth), or anodontia (lack of all teeth). Tooth agenesis may occur either in association with genetic syndromes, based on the presence of other inherited abnormalities, or as a non-syndromic trait, with both familiar and sporadic cases reported. In this study, we enrolled 16 individuals affected by tooth agenesis, prevalently hypodontia, and we carried out direct Sanger sequencing of paired box 9 (PAX9) and Msh homeobox 1 (MSX1) genes in 9 subjects. Since no mutations were identified, we performed whole exome sequencing (WES) in the members of 5 families to identify causative gene mutations either novel or previously described. Three individuals carried a known homozygous disease mutation in the Wnt family member 10A (WNT10A) gene (rs121908120). Interestingly, two of these individuals were siblings and also carried a heterozygous functional variant in EDAR-associated death domain (EDARADD) (rs114632254), another disease causing gene, generating a combination of genetic variants never described until now. The analysis of exome sequencing data in the members of other 3 families highlighted new candidate genes potentially involved in tooth agenesis and considered suitable for future studies. Overall, our study confirmed the major role played by WNT10A in tooth agenesis and the genetic heterogeneity of this disease. Moreover, as more genes are shown to be involved in tooth agenesis, WES analysis may be an effective approach to search for genetic variants in familiar or sporadic tooth agenesis, at least in more severe clinical manifestations.

Original publication

DOI

10.3892/ijmm.2016.2742

Type

Journal article

Journal

International journal of molecular medicine

Publication Date

11/2016

Volume

38

Pages

1338 - 1348

Addresses

Department of Molecular and Translational Medicine, Division of Biology and Genetics, University of Brescia, I-25123 Brescia, Italy.

Keywords

Humans, Anodontia, DNA Mutational Analysis, Base Sequence, Mutation, Polymorphism, Single Nucleotide, Adolescent, Adult, Middle Aged, Child, Family Health, Female, Male, Wnt Proteins, PAX9 Transcription Factor, MSX1 Transcription Factor, Edar-Associated Death Domain Protein, Young Adult, Exome