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The Klotho ( KL ) gene is involved in phosphate homeostasis. Polymorphisms in this gene have been reported to be associated with the risk of cardiovascular disease. Here we used computational tools to predict the damage-associated single nucleotide polymorphisms (SNPs) in the human  KL  gene. We further investigated the association of SNPs in the  KL  gene and mortality in the Swedish multicenter prospective Osteoporotic Fractures in Men (MrOS) cohort. This study included 2921 men (aged 69–81 years) with mean 4.49 ± 1.03 years follow-up. 18 SNPs in the  KL  gene were genotyped using Sequenom. These SNPs were identified by  in silico  tools for the coding and noncoding genome to predict the damaging SNPs. After quality analyses, SNPs were analyzed for mortality risk using two steps approach on logistic regression model screening and then Cox regression model confirmation. Two non-synonymous SNPs rs9536314 and rs9527025 were found to be potentially damaging SNPs that affect  KL  protein stability and expression. However, these two SNPs were not statistically significantly associated with all-cause mortality (crude Hazard ratio [HR] 1.72, 95% confidence interval [CI] 0.96–3.07 in rs9536314; crude HR 1.82, 95% CI 0.998–3.33 in rs9527025) or cardiovascular mortality (crude HR 1.52, 95% CI 0.56–4.14 in rs9536314; crude HR 1.54, 95% CI 0.55–4.33 in rs9527025) in additive model using Cox regression analysis. In conclusion, these two potentially damaging SNPs (rs9536314 and rs9527025) in the  KL  gene were not associated with all-cause mortality or cardiovascular mortality in MrOs cohort. Larger scales studies and meta-analysis are needed to confirm the correlation between polymorphisms of the  KL  gene and mortality.

The association between Single Nucleotide Polymorphisms of Klotho Gene and Mortality in Elderly Men: The MrOS Sweden Study