What is BHMT rs3733890 and Why Does the Foundation Zoomer Test for It?

Methylation pathway SNP

BHMT rs3733890 is a single-letter genetic variant in the BHMT gene, which encodes an enzyme involved in remethylating homocysteine to methionine. Measuring this variant helps reveal individual differences in one‑carbon metabolism and methylation pathway patterns that interact with nutrient and metabolic markers.

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BHMT rs3733890

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About BHMT rs3733890

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About BHMT rs3733890

Overview and History

BHMT rs3733890 is a single nucleotide polymorphism (SNP) in the BHMT gene, which codes for betaine‑homocysteine methyltransferase, an enzyme in the one‑carbon (methylation) pathway. This SNP has been studied as a common genetic variant that can be associated with altered enzyme activity or shifts in related metabolic markers. BHMT’s biochemical role is to use betaine as a methyl donor to convert homocysteine into methionine, a key step parallel to folate‑dependent remethylation. Because BHMT interfaces with homocysteine, methionine, and S‑adenosylmethionine (SAM) pools, variation in the gene may influence methylation capacity and how the body processes certain nutrients and toxins.

Interpreting Highs and Lows

Interpretation of BHMT rs3733890 depends on the specific allele or genotype and on other lab findings. Genotypes linked in studies to reduced BHMT activity are often associated with patterns such as modestly higher homocysteine or altered methionine/SAM ratios, while genotypes linked to relatively higher activity may show the opposite pattern. These associations are not diagnostic on their own; their clinical meaning becomes clearer when viewed alongside homocysteine, folate, B12, betaine, and other Foundation Zoomer results.

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BHMT rs3733890 is included in the Foundation Zoomer’s methylation genetics panel to clarify how an individual’s genetic background might influence one‑carbon metabolism. Combined with nutrient and metabolic markers, this genetic information helps providers recognize patterns in methylation, homocysteine handling, and related metabolic balance to support personalized clinical interpretation.

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BHMT rs3733890 FAQs

What is BHMT rs3733890 and why is it important?

BHMT rs3733890 is a commonly studied genetic variant in the BHMT gene, which affects an enzyme that helps convert homocysteine into methionine using betaine. It matters because differences in this gene can be linked to shifts in methylation pathway activity and related metabolic markers. Knowing this variant helps contextualize lab patterns in one‑carbon metabolism and nutrient interactions.

What does it mean if my BHMT rs3733890 levels are low?

For a genetic SNP, “low” usually refers to having an allele associated with lower BHMT activity. That pattern has been associated in research with modest shifts such as higher homocysteine or altered methionine/SAM balance. These findings are best interpreted with the full Foundation Zoomer panel, including homocysteine, folate, B12, and related markers.

What does it mean if my BHMT rs3733890 levels are high?

If your report shows the allele linked with higher BHMT activity, it may be associated with different homocysteine and methionine patterns than alleles linked with lower activity. Elevated or reduced activity associations do not diagnose a condition by themselves; their significance depends on how they align with other lab values and clinical context.

Why is this biomarker included in the Foundation Zoomer?

BHMT rs3733890 helps complete the methylation genetics picture within the Foundation Zoomer. When combined with nutrient status and metabolic markers, the genetic data reveal patterns in one‑carbon metabolism and homocysteine handling that support more targeted interpretation and personalized care planning.

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