MTHFR Heterozygous Versus Homozygous

Variants of the MTHFR mutation A variant is a part of a gene's DNA that's commonly different, or varies, from person to person. Having one variant — heterozygous — is less likely to contribute to health issues. Some people believe having two mutations — homozygous — may lead to more serious problems.

MTHFR is common condition affecting a large number of people. There are heterozygous and homozygous forms. This video attempts to explain the implications of these SNPs (pronounced snips).