Objective To detect MTHFR gene C677T polymorphism in patients with SAD and VD and explore the relationship between C677T mutation and dementia.

• 目的为了阐明痴呆与亚甲基四氢叶酸还原酶(MTHFR)基因C677T突变的关系,我们进行了MTHFR基因C677T多态性的研究。