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Background  Plasma levels of YKL-40 are elevated in patients with atrial fibrillation (AF). We hypothesized that a single nucleotide polymorphism (SNP) that affects YKL-40 plasma levels is associated to the risk of lone AF.    Findings  We included 178 young patients with lone AF and the first episode before the age of 40 years, and a control group of 875 healthy individuals. We analyzed a promoter SNP (−131CG) (rs4950928) in the Chitinase 3–like 1 ( CHI3L1 ) gene encoding YKL-40, which had previously been associated with elevated levels of YKL-40.    Conclusions  The (−131CG) genotype was not associated with increased risk of AF. Genetically increased YKL-40 levels were not associated to AF.

A polymorphism associated with increased levels of YKL-40 and the risk of early onset of lone atrial fibrillation