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Elevated high sensitive C-reactive protein (hsCRP) is a marker for systemic inflammation and a risk marker for atherosclerotic cardiovascular disease (ACVD), and has also been associated with periodontitis. Inter-individual variation for hsCRP in periodontitis has been shown.  ANRIL  is the strongest genetic susceptibility locus for both periodontitis and ACVD, and it is speculated that genetic variation in  ANRIL  may modulate inflammatory processes. Therefore, we explored the possible association between hsCRP plasma levels and a leading  ANRIL  single nucleotide polymorphism (SNP) in periodontitis patients and controls. 171 healthy subjects with North European descent (115 periodontitis and 56 controls) were included in this case-control study. hsCRP levels were determined and subjects were genotyped for the leading  ANRIL  SNP rs1333048. In a multivariate analysis, periodontitis, female gender, increasing BMI and homozygosity for the major allele (AA-genotype) of rs1333048 were significantly associated with elevated hsCRP plasma levels (p = 0.012, p = 0.004, p = 0.007 and p = 0.003, respectively). Periodontitis patients with rs1333048 AA-genotype showed higher levels of hsCRP than those carrying the minor C allele (median: 4.5 mg/L vs. 1.6 mg/L, p adjusted  = 0.007). This study is the first to show that, in addition to gender and BMI, also a leading SNP in  ANRIL  is explanatory for inter-individual variation in hsCRP levels in periodontitis patients of North European descent.

A Lead ANRIL Polymorphism Is Associated with Elevated CRP Levels in Periodontitis: A Pilot Case-Control Study