Primary failure of eruption: Clinical and genetic findings in the mixed dentition.

Primary failure of eruption: Clinical and genetic findings in the mixed dentition.

Angle Orthod. 2018 Jan 29;:

Authors: Grippaudo C, Cafiero C, D'Apolito I, Ricci B, Frazier-Bowers SA

Abstract
OBJECTIVE: To test the hypothesis that mutations in the parathyroid hormone 1 receptor ( PTH1R) include effects in both primary and permanent teeth.
MATERIALS AND METHODS: DNA was extracted from saliva samples of 29 patients (8 familial and 21 sporadic) who presented with clinical evidence of infraoccluded teeth, and their unaffected relatives (N = 22). Sequencing followed by mutational analysis of the coding regions of PTH1R gene was completed for all individuals (N = 29).
RESULTS: Eight of 29 cases revealed a heterozygous pathogenic variant in the PTH1R gene; five of eight variants represented distinct mutations based on comparison with the dbSNP, HGMD, and ESP databases. One mutation (c.1765 T>C p.Trp89Arg) was found to segregate within a family (n = 3). In silico analyses for all variants revealed a putative pathogenic effect. A genotype-phenotype correlation was reported as defined by a functional mutation in PTH1R and corresponding effects on one or more posterior teeth only; unilateral or bilateral involvement, infraoccluded primary teeth.
CONCLUSIONS: Novel mutations were reported in the PTH1R gene that included PFE-affected primary molars, thus providing the basis for using a genetic diagnostic tool for early diagnosis leading to proper management.

PMID: 29376733 [PubMed - as supplied by publisher]

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