Abstract
Many studies have reported an association between the methylenetetrahydrofolate reductase (MTHFR) c.677C>T polymorphism and reduced bone mineral density (BMD), but results have been inconsistent. We, therefore, performed a meta-analysis to further explore this association. Twenty-one studies, comprising 33,045 subjects, analyzed the association of MTHFR c.677C>T with femoral neck BMD. Significant association with reduced BMD was observed in Caucasians (recessive model: WMD = −0.004 g/cm2, 95 % CI −0.008 to −0.006), post-menopausal women (recessive model: WMD = −0.005 g/cm2, 95 % CI −0.007 to −0.003), men (dominant model: WMD = −0.004 g/cm2, 95 % CI −0.005 to −0.004; recessive model: WMD = −0.004 g/cm2, 95 % CI −0.005 to −0.004; TT vs. CC: WMD = −0.006 g/cm2, 95 % CI −0.006 to −0.006; CT vs. CC: WMD = −0.003 g/cm2, 95 % CI −0.003 to −0.003), and cohort studies (recessive model: WMD = −0.003 g/cm2, 95 % CI −0.006 to −0.001). Twenty-two studies, which included 32,271 subjects, analyzed the MTHFR c.677C>T association with lumbar spine BMD. Significant association with reduced BMD was observed in Caucasians, women, post-menopausal women, men, and cohort studies. Seven studies, comprising 6806 subjects, analyzed the MTHFR c.677C>T association with total hip BMD, but no significant association was observed in any population. Nine studies involving 5591 subjects analyzed the association with total body BMD. Significant association with reduced BMD was observed in overall and women subgroup analyses. In summary, this meta-analysis indicates that the MTHFR c.677C>T polymorphism is associated with reduced BMD in lumbar spine and femoral neck in Caucasians, post-menopausal women, and men, and with total body BMD in women. In addition, our results suggest that new studies examining the association between MTHFR c.677C>T polymorphism and BMD of lumbar spine and femoral neck in Asians is warranted, because I 2 > 75.0 % was observed.
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H.-Z. Li and W. Wang contributed equally to this study and should be considered as co-first authors.
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Li, HZ., Wang, W., Liu, YL. et al. Association between the methylenetetrahydrofolate reductase c.677C>T polymorphism and bone mineral density: an updated meta-analysis. Mol Genet Genomics 291, 169–180 (2016). https://doi.org/10.1007/s00438-015-1101-z
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DOI: https://doi.org/10.1007/s00438-015-1101-z