Can a genetics defect called mthfr1 cause a lot of problems a gentics told me it does not is that true or not?

Can cause many probs: Mthfr mutations cause problems with methylation, a crucial process in every cell. Patients with these problems have increased incidence of depression, bipolar disorder, schizophrenia, autism, birth defects, heart disease, stroke & possibly cancer. However, those with just 1 mutation have much less risk than those with 2 copies of the mutation. See http://heal-thyself.Ning.Com/profiles/blogs/mthfr-1.