Abstract

Methylene-tetrahydrofolate reductase (MTHFR) is a homocysteine metabolism-related enzyme and defects of MTHFR is a risk factor for hyperhomocysteinemia and related various neurological disease. Among them, 665C>T polymorphism is the most common form. We report a 48 years old man presenting with progressive psychiatric problems along with severe demyelinating polyneuropathy due to homozygous c.665C>T homozygote polymorphism superimposed by compound heterozygous mutation (c.1417C>T, p.Arg473Trp) in the <i>MTHFR</i> gene, without thromboembolic changes.

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