title: Novel hairpin-shaped primer assay to study the association of the -44 single-nucleotide polymorphism of the DEFB1 gene with early-onset periodontal disease.
abstract: A powerful, cost-effective new method for studying single-nucleotide polymorphisms (SNPs) is described. This method is based on the use of hairpin-shaped primers (HP), which give a sensitive and specific PCR amplification of each specific allele, without the use of costly fluorophore-labeled probes and any post-PCR manipulation. The amplification is monitored in real-time using SYBR Green I dye and takes only 2 h to yield results. The HP assay has a simple design and utilizes a conventional real-time PCR apparatus. The -44 C-->G transversion in the DEFB1 gene (which encodes human beta-defensin 1) has been previously associated with Candida carriage in oral epithelia. In this study, we analyzed the association between early-onset periodontal disease (EOP) and the -44 SNP. We used an HP assay to study the distribution of the -44 SNP in 264 human DNAs obtained from two cohorts of EOP patients and healthy controls from different ethnic backgrounds. The results indicate that the -44 SNP has a similar distribution between EOP and healthy patients, suggesting that it is not associated with the disease.
authors.affiliation: Department of Oral Biology, University of Medicine and Dentistry of New Jersey, Newark, New Jersey 07103-2714, USA.
authors.forename: Michele
authors.initials: M
authors.lastname: Boniotto
authors.forename: Manzour Hernando
authors.initials: MH
authors.lastname: Hazbón
authors.forename: William James
authors.initials: WJ
authors.lastname: Jordan
authors.forename: Greig Patrick
authors.initials: GP
authors.lastname: Lennon
authors.forename: Joyce
authors.initials: J
authors.lastname: Eskdale
authors.forename: David
authors.initials: D
authors.lastname: Alland
authors.forename: Grant
authors.initials: G
authors.lastname: Gallagher
mesh_terms: D000483:Alleles; D017931:DNA Primers / Q000235:genetics*; D005006:Ethnicity / Q000235:genetics; D005838:Genotype; D006801:Humans; D010510:Periodontal Diseases / Q000208:ethnology / Q000235:genetics*; D016133:Polymerase Chain Reaction / Q000379:methods; D020641:Polymorphism, Single Nucleotide / Q000235:genetics*; D012680:Sensitivity and Specificity; D023083:beta-Defensins / Q000235:genetics*
chemical_list: C406407:DEFB1 protein, human; D017931:DNA Primers; D023083:beta-Defensins