MTHFR Gene Mutation
MTHFR is the gene that codes for methylenetetrahydrofolate reductase, an enzyme involved in producing 5-methyltetrahydrofolate (L-methylfolate), the main circulating form of folate. Common inherited variants of this gene, most often C677T and A1298C, are associated with reduced activity of that enzyme and with differences in how folate is handled in the methylation cycle. Carrying one of these common variants is a genetic difference rather than a disease, and many people who carry one have no related health problems. Severe MTHFR deficiency, in which enzyme activity is nearly absent, is a separate and rare inherited metabolic disorder. MTHFR genotype is identified through genetic testing, and clinicians typically interpret the result alongside homocysteine, folate, and vitamin B12 status rather than on its own.
How Medical Foods Can Help
MTHFR is the gene that codes for methylenetetrahydrofolate reductase, the enzyme the body uses to produce 5-methyltetrahydrofolate (L-methylfolate), the active circulating form of folate. Common inherited variants of the gene are associated with reduced activity of that enzyme. Medical foods are formulated for the specific dietary management of a disease or condition with distinctive nutritional requirements and, by FDA definition, are intended for use under the supervision of a physician; they are not drugs and not dietary supplements, and they do not act on the gene. Iaomai's methylated formulas supply folate as L-methylfolate and vitamin B12 as methylcobalamin, bioactive forms that the body uses in the methylation cycle without the enzymatic conversion step other forms require. Each formula is intended for the dietary management of its own indication, such as peripheral neuropathy or vascular health, rather than for a genetic variant. Whether one belongs in your nutrition plan is a decision for your healthcare provider, who can read your genotype alongside your labs and full medical history.
Methylation and Neurotransmitters
L-methylfolate and methylcobalamin play a role in the methylation reactions involved in the synthesis of neurotransmitters such as serotonin, dopamine, and norepinephrine.
Role in One-Carbon Metabolism
Folate and vitamin B12 are involved in one-carbon metabolism, the group of cellular reactions that plays a role in DNA synthesis and cell division.
Homocysteine Pathways
Folate, vitamin B12, and active B6 (P-5-P) are involved, as methyl donors and cofactors, in the pathways that metabolize homocysteine to methionine and cysteine.
Common Symptoms
- Chronic fatigue
- Brain fog and memory issues
- Anxiety or mood disorders
- Chronic pain conditions
- Elevated homocysteine levels
What Causes MTHFR Gene Mutation?
MTHFR variants are inherited, one copy of the gene from each parent, and how much enzyme activity is affected is associated with which copies a person carries: two copies of the C677T variant are associated with lower enzyme activity than one copy, and one copy with lower activity than none. In the folate pathway, this enzyme converts 5,10-methylenetetrahydrofolate into 5-methyltetrahydrofolate, the folate form the body uses, together with vitamin B12, in the remethylation of homocysteine back into methionine. When enzyme activity is reduced, less 5-methyltetrahydrofolate is available for that step and homocysteine can accumulate in the blood, which is why an elevated homocysteine level is a laboratory finding clinicians look for in people who carry two copies of C677T. Accumulation is not automatic. Homocysteine levels also vary with dietary folate and vitamin B12 status, among other factors, which is why the same genotype can be seen with a normal homocysteine level in one person and an elevated one in another. Carrying a common MTHFR variant is not, on its own, considered an explanation for symptoms, and the nonspecific concerns people often connect to it, such as fatigue, difficulty concentrating, and mood changes, have many possible explanations that a clinician needs to evaluate in context.
“Dr. Hecker recommended a genetic test, which revealed a mutation in a gene. After a year on a supplement, my almost constant shin pain is nearly completely gone. I am back to running normally. Amazing knowledge of such a unique field of study.”
Individual experience. Results vary from person to person and are not typical or guaranteed. Testimonials describe one person's experience and are not evidence that any product will work for you. Iaomai Health products are medical foods for the dietary management of specific conditions, intended for use under the supervision of a physician.
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