Resumen de Estudio genético de una familia chilena con tres fenotipos dentales diferentes
Rosa Andrea Pardo V, Silvia Castillo T, Alexandre R. Vieira
Background: Congenital dental anomalies can affect up to 25% of the population. Aim: To report the genetic study of a family with dental anomalies. Material and methods: We studied a Chilean family presenting with three independent dental phenotypes: third molar agenesis, supernumerary teeth, and dentinal dysplasia type I. We searched for mutations in candidate genes proposed for tooth agenesis and supernumerary teeth: IRF6, FGFR1, MSX1, MSX2, PAX9, PRDM16 and TGFA. We also studied DSPP as a candidate gene for dentinal dysplasia type I. Results: We did not find mutations in FGFR1, MSX2, PAX9, PRDM16, or TGFA. We found a MSX1 mutation (G16D) in both affected and unaffected family members. Also, we found a genetic variation not described before in IRF6 in the dentinal dysplasia type I case. Conclusions: Further investigation is necessary to evaluate if these variants are functional in nature. Finally, we are reporting a mutation in DSPP in an asymptomatic 2-year-old child, which illustrates the ethical pitfalls of interpreting molecular data for genetic counseling of young and/or asymtomatic individuals
