title: A screen of a large Czech cohort of oligodontia patients implicates a novel mutation in the PAX9 gene.
abstract: Tooth agenesis is one of the most common developmental anomalies in humans. To date, many mutations involving paired box 9 (PAX9), msh homeobox 1 (MSX1), and axin 2 (AXIN2) genes have been identified. The aim of the present study was to perform screening for mutations and/or polymorphisms using the capillary sequencing method in the critical regions of PAX9 and MSX1 genes in a group of 270 individuals with tooth agenesis and in 30 healthy subjects of Czech origin. This screening revealed a previously unknown heterozygous g.9527G>T mutation in the PAX9 gene in monozygotic twins with oligodontia and three additional affected family members. The same variant was not found in healthy relatives. This mutation is located in intron 2, in the region recognized as the splice site between exon 2 and intron 2. We hypothesize that the error in pre-mRNA splicing may lead to lower expression of PAX9 protein and could have contributed to the development of tooth agenesis in the affected subjects.
authors: Laboratory of DNA Diagnostics, Department of Biochemistry, Faculty of Science, Masaryk University, Brno, Czech Republic; Laboratory of Animal Embryology, Institute of Animal Physiology and Genetics, The Academy of Sciences of the Czech Republic, Brno, Czech Republic.
authors: Omar
authors: O
authors: Šerý
authors: Ondřej
authors: O
authors: Bonczek
authors: Alena
authors: A
authors: Hloušková
authors: Pavlína
authors: P
authors: Černochová
authors: Jiří
authors: J
authors: Vaněk
authors: Ivan
authors: I
authors: Míšek
authors: Přemysl
authors: P
authors: Krejčí
authors: Lydie
authors: L
authors: Izakovičová Hollá
mesh_terms: D000293:Adolescent; D000848:Anodontia / Q000235:genetics*; D002648:Child; D015331:Cohort Studies; D018153:Czech Republic; D004200:Diseases in Twins / Q000235:genetics; D005091:Exons / Q000235:genetics; D005260:Female; D014644:Genetic Variation / Q000235:genetics; D006147:Guanine; D006579:Heterozygote; D006801:Humans; D007438:Introns / Q000235:genetics; D051957:MSX1 Transcription Factor / Q000235:genetics; D008297:Male; D008403:Mass Screening; D009154:Mutation / Q000235:genetics*; D016366:Open Reading Frames / Q000235:genetics; D051764:PAX9 Transcription Factor / Q000235:genetics*; D011110:Polymorphism, Genetic / Q000235:genetics; D022821:RNA Splice Sites / Q000235:genetics; D013941:Thymine; D014430:Twins, Monozygotic / Q000235:genetics; D020506:Untranslated Regions / Q000235:genetics; D055815:Young Adult
chemical_list: D051957:MSX1 Transcription Factor; C484083:MSX1 protein, human; D051764:PAX9 Transcription Factor; C497323:PAX9 protein, human; D022821:RNA Splice Sites; D020506:Untranslated Regions; D006147:Guanine; D013941:Thymine
keywords: PAX9; monozygotic twins; mutation screening; oligodontia; tooth agenesis