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Background  Dental caries is a common chronic disease among children and adults alike, posing a substantial health burden. Caries is affected by multiple genetic and environmental factors, and prior studies have found that a substantial proportion of caries susceptibility is genetically inherited.    Methods  To identify such genetic factors, we conducted a genome-wide linkage scan in 464 extended families with 2616 individuals from Iowa, Pennsylvania and West Virginia for three dental caries phenotypes: (1)  PRIM : dichotomized as zero versus one or more affected primary teeth, (2)  QTOT1 : age-adjusted quantitative caries measure for both primary and permanent dentitions including pre-cavitated lesions, and (3)  QTOT2 : age-adjusted quantitative caries excluding pre-cavitated lesions. Genotyping was conducted for approximately 600,000 SNPs on an Illumina platform, pruned to 127,511 uncorrelated SNPs for the analyses reported here.    Results  Multipoint non-parametric linkage analyses generated peak LOD scores exceeding 2.0 for eight genomic regions, but no LOD scores above 3.0 were observed. The maximum LOD score for each of the three traits was 2.90 at 1q25.3 for  PRIM , 2.38 at 6q25.3 for  QTOT1 , and 2.76 at 5q23.3 for  QTOT2 . Some overlap in linkage regions was observed among the phenotypes. Genes with a potential role in dental caries in the eight chromosomal regions include  CACNA1E, LAMC2 ,  ALMS1 ,  STAMBP ,  GXYLT2, SLC12A2 ,  MEGF10 ,  TMEM181, ARID1B,  and, as well as genes in several immune gene families. Our results are also concordant with previous findings from association analyses on chromosomes 11 and 19.    Conclusions  These multipoint linkage results provide evidence in favor of novel chromosomal regions, while also supporting earlier association findings for these data. Understanding the genetic etiology of dental caries will allow designing personalized treatment plans based on an individual’s genetic risk of disease.    Electronic supplementary material  The online version of this article (10.1186/s12903-018-0559-6) contains supplementary material, which is available to authorized users.

Novel caries loci in children and adults implicated by genome-wide analysis of families