title: Genome-wide association study identifies four loci associated with eruption of permanent teeth.
abstract: The sequence and timing of permanent tooth eruption is thought to be highly heritable and can have important implications for the risk of malocclusion, crowding, and periodontal disease. We conducted a genome-wide association study of number of permanent teeth erupted between age 6 and 14 years, analyzed as age-adjusted standard deviation score averaged over multiple time points, based on childhood records for 5,104 women from the Danish National Birth Cohort. Four loci showed association at P<5×10(-8) and were replicated in four independent study groups from the United States and Denmark with a total of 3,762 individuals; all combined P-values were below 10(-11). Two loci agreed with previous findings in primary tooth eruption and were also known to influence height and breast cancer, respectively. The two other loci pointed to genomic regions without any previous significant genome-wide association study results. The intronic SNP rs7924176 in ADK could be linked to gene expression in monocytes. The combined effect of the four genetic variants was most pronounced between age 10 and 12 years, where children with 6 to 8 delayed tooth eruption alleles had on average 3.5 (95% confidence interval: 2.9-4.1) fewer permanent teeth than children with 0 or 1 of these alleles.
authors.affiliation: Department of Epidemiology Research, Statens Serum Institut, Copenhagen, Denmark. fge@ssi.dk
authors.forename: Frank
authors.initials: F
authors.lastname: Geller
authors.forename: Bjarke
authors.initials: B
authors.lastname: Feenstra
authors.forename: Hao
authors.initials: H
authors.lastname: Zhang
authors.forename: John R
authors.initials: JR
authors.lastname: Shaffer
authors.forename: Thomas
authors.initials: T
authors.lastname: Hansen
authors.forename: Ann-Louise
authors.initials: AL
authors.lastname: Esserlind
authors.forename: Heather A
authors.initials: HA
authors.lastname: Boyd
authors.forename: Ellen A
authors.initials: EA
authors.lastname: Nohr
authors.forename: Nicholas J
authors.initials: NJ
authors.lastname: Timpson
authors.forename: Ghazaleh
authors.initials: G
authors.lastname: Fatemifar
authors.forename: Lavinia
authors.initials: L
authors.lastname: Paternoster
authors.forename: David M
authors.initials: DM
authors.lastname: Evans
authors.forename: Robert J
authors.initials: RJ
authors.lastname: Weyant
authors.forename: Steven M
authors.initials: SM
authors.lastname: Levy
authors.forename: Mark
authors.initials: M
authors.lastname: Lathrop
authors.forename: George Davey
authors.initials: GD
authors.lastname: Smith
authors.forename: Jeffrey C
authors.initials: JC
authors.lastname: Murray
authors.forename: Jes
authors.initials: J
authors.lastname: Olesen
authors.forename: Thomas
authors.initials: T
authors.lastname: Werge
authors.forename: Mary L
authors.initials: ML
authors.lastname: Marazita
authors.forename: Thorkild I A
authors.initials: TI
authors.lastname: Sørensen
authors.forename: Mads
authors.initials: M
authors.lastname: Melbye
mesh_terms: D000293:Adolescent; D000483:Alleles; D002648:Child; D015331:Cohort Studies; D003718:Denmark; D005260:Female; D055106:Genome-Wide Association Study; D005838:Genotype; D025743:HMGA2 Protein / Q000235:genetics; D006801:Humans; D008297:Male; D008565:Membrane Proteins / Q000235:genetics; D000074428:Peroxisomal Biogenesis Factor 2; D020641:Polymorphism, Single Nucleotide / Q000235:genetics*; D014078:Tooth Eruption / Q000235:genetics*; D014094:Tooth, Deciduous / Q000502:physiology*; D014481:United States
chemical_list: D025743:HMGA2 Protein; D008565:Membrane Proteins; D000074428:Peroxisomal Biogenesis Factor 2