I have recently been diagnosed with the C677T heterozygous gene mutation. What I would most like to know is: does this mutation have any bearing or is it something I do not need to concern myself with?
MTHFR is a gene. We all carry two copies of MTHFR. MTHFR tells our body how to create an enzyme involved in breaking down the amino acid homocysteine. As is true for any gene, the DNA code of the MTHFR gene can vary. When we identify a part of the sequence that varies, we call it a "variant." Genetic research aims to identify specific variants that cause harm or benefit to health.
There are two MTHFR gene variants, called C677T and A1298C, that have been an active area of study. These variants are common. In America, about 25% of people who are Hispanic, and 10-15% of people who are Caucasian have two copies of C677T.
Studies have found that women with two C677T gene variants have an increased risk for having a child with a neural tube defect. Studies have also found that men and women with two C677T gene variants and elevated homocysteine levels may be at a mild increased risk for blood clots (venous thromboembolism). Many studies on MTHFR and other health risks have been completed, but with conflicting results.
Wilcken B & cols. Geographical and ethnic variation of the 677C>T allele of 5,10 methylenetetrahydrofolate reductase (MTHFR): Findings from over 7000 newborns from 16 areas world wide. J Med Genet 2003; 40(8):619–25. https://www.ncbi.nlm.nih.gov/pubmed/12920077.