A novel homozygous PTH1R variant identified through whole-exome sequencing further expands the clinical spectrum of primary failure of tooth eruption in a consanguineous Saudi family
Institution:
1. Department of Pediatric Endocrinology, Katip Celebi University, Faculty of Medicine, Izmir;2. Department of Biochemistry, Dokuz Eylul University, Faculty of Medicine, Izmir;3. Department of Pediatric Endocrinology, Dokuz Eylul University, Faculty of Medicine, Izmir;4. Department of Pediatric Endocrinology, Adnan Menderes University, Faculty of Medicine, Ayd?n;1. Department of Medical Physiology, Faculty of Medicine, Al-Moassat Hospital, University of Alexandria, Alexandria, Egypt;2. Department of Clinical Pharmacology, Faculty of Medicine, Al-Moassat Hospital, University of Alexandria, Alexandria, Egypt;3. Department of Medical Biochemistry, Faculty of Medicine, Al-Moassat Hospital, University of Alexandria, Alexandria, Egypt
Abstract:
ObjectivesThe present study aimed to identify the genetic cause of non-syndromic primary failure of tooth eruption in a five-generation consanguineous Saudi family using whole-exome sequencing (WES) analysis.DesignThe family pedigree and phenotype were obtained from patient medical records. WES of all four affected family members was performed using the 51Mb SureSelect V4 library kit and then sequenced using the Illumina HiSeq2000 sequencing system. Sequence alignment, variant calling, and the annotation of single nucleotide polymorphisms and indels were performed using standard bioinformatics pipelines. The genotype of candidate variants was confirmed in all available family members by Sanger sequencing.ResultsPedigree analysis suggested that the inheritance was autosomal recessive. WES of all affected individuals identified a novel homozygous variant in exon 8 of the parathyroid hormone 1 receptor gene (PTH1R) (NM_000316: c.611T>A: p.Val204Glu).ConclusionTo the best of our knowledge, this is the first report of primary failure of eruption caused by a homozygous mutation in PTH1R. Our findings prove the application of WES as an efficient molecular diagnostics tool for this rare phenotype and further broaden the clinical spectrum of PTH1R pathogenicity.
