title: Genetic analysis of juvenile periodontitis in families ascertained through an affected proband.
abstract: Data from 28 families ascertained through a proband with juvenile periodontitis were used to test a series of Mendelian models of inheritance that included both autosomal and X-linked transmission. There was strong evidence of familial aggregation of this progressive dental disease, and the best-fitting model was an autosomal recessive model. Because of the rather limited age range for expression of the disease in this situation, simulations were done, in a model-choice analysis using samples of this size, to assess the chance of mistaking an autosomal dominant disease (with masking of the affected phenotype outside a specified age range) for an autosomal recessive disease. While the rate of Type II error was fairly high (40%) when competing models in these simulations were compared, these data suggest that it is reasonable to infer that juvenile periodontitis is an autosomal recessive disorder.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D010520:Aggressive Periodontitis / Q000235:genetics*; D002648:Child; D002675:Child, Preschool; D005260:Female; D005799:Genes, Dominant; D005808:Genes, Recessive; D008040:Genetic Linkage; D006801:Humans; D007223:Infant; D008297:Male; D008875:Middle Aged; D008957:Models, Genetic; D010375:Pedigree; D010510:Periodontal Diseases / Q000235:genetics*; D011336:Probability; D014960:X Chromosome