Methylenetetrahydrofolate Reductase () C677T Polymorphism and Subacute Combined Degeneration: Revealing a Genetic Predisposition.

Vitamin B12 deficiency is regarded as the prevailing cause of subacute combined degeneration of the spinal cord (SCD). Nevertheless, the genetic predisposition to SCD remains unclear. The aim of this study was to explore the association between methylenetetrahydrofolate reductase gene () C677T polymorphism and SCD. We investigated C677T polymorphism in SCD patients and found that the distribution of C677T genotypes was significantly different between SCD patients and age-matched controls. Furthermore, the T allele frequency was markedly increased in SCD compared with the controls. In addition, the plasma homocysteine concentrations in subjects with the TT genotype were significantly elevated compared to those with the CC genotype. Logistic regression analysis results revealed that the C677T genotype (TT vs. CT and CC) and vitamin B12 deficiency were risk factors for SCD. Our findings indicate that the T allele of the C677T confers a strong genetic predisposition to SCD and provide evidence of an association between C677T polymorphism and SCD. These data reveal a potential mechanism underlying SCD.