title: Mutational analysis of families affected with molar oligodontia.
abstract: Oligodontia, the congenital absence of six or more permanent teeth, is a common developmental anomaly of human dentition whose genetic basis is poorly understood. We recently reported a nonsyndromic form of oligodontia involving mostly all permanent molars in a large kindred, caused by a frameshift mutation in exon 2 of the human PAX9 gene [3]. To better understand the genotype/phenotype correlation in non-syndromic familial oligodontia, we identified additional families with a similar pattern of molar oligodontia. We hypothesize that molar oligodontia is due to allelic heterogeneity involving different mutations in PAX9. To test this hypothesis, we performed pedigree analysis followed by mutational analysis. Pedigree analysis revealed that the oligodontia trait is inherited in an autosomal dominant fashion. Mutational analysis of PAX9 thus far excludes the presence of the previously identified frameshift mutation.
authors.affiliation: Department of Orthodontics, University of Texas Health Science Center-Dental Branch, Houston, Texas 77030, USA.
authors.forename: Sylvia A
authors.initials: SA
authors.lastname: Frazier-Bowers
authors.forename: Meredith R
authors.initials: MR
authors.lastname: Scott
authors.forename: Adriana
authors.initials: A
authors.lastname: Cavender
authors.forename: John
authors.initials: J
authors.lastname: Mensah
authors.forename: Rena N
authors.initials: RN
authors.lastname: D'Souza
mesh_terms: D000848:Anodontia / Q000235:genetics*; D001426:Bacterial Proteins; D001427:Bacterial Toxins / Q000235:genetics; D001483:Base Sequence / Q000235:genetics; D002648:Child; D004252:DNA Mutational Analysis; D005260:Female; D005799:Genes, Dominant; D006801:Humans; D008297:Male; D008963:Molar / Q000002:abnormalities*; D010375:Pedigree
chemical_list: D001426:Bacterial Proteins; D001427:Bacterial Toxins; C402669:PaxA protein, Pasteurella aerogenes