What is SHMT1 rs1979277 and Why Does the Foundation Zoomer Test for It?

Folate one‑carbon enzyme variant

SHMT1 rs1979277 is a common genetic variant in the SHMT1 gene, which encodes a cytosolic enzyme that links serine and folate metabolism. Changes at this site can alter one‑carbon flow used for DNA building blocks and methylation, so testing helps clarify genetic influences on folate-related pathways and nutrient interactions.

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SHMT1 rs1979277

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About SHMT1 rs1979277

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About SHMT1 rs1979277

Overview and History

SHMT1 rs1979277 is a single nucleotide polymorphism in the SHMT1 gene, which encodes cytosolic serine hydroxymethyltransferase. Biochemically, SHMT1 operates in the folate‑dependent one‑carbon pathway: it converts serine to glycine while generating 5,10‑methylene‑tetrahydrofolate, a key substrate for nucleotide synthesis and methylation reactions. This variant has been studied for its influence on folate metabolism, homocysteine levels, and methylation capacity. Differences at rs1979277 can be associated with altered enzyme expression or activity, which may shift how one‑carbon units are distributed between DNA synthesis and methylation processes across tissues.

Interpreting Highs and Lows

Because rs1979277 is a genetic variant rather than a concentration, “higher” or “lower” refers to alleles linked with relatively increased or decreased SHMT1 expression or activity. Alleles associated with relatively higher activity may favor stronger local production of one‑carbon units for nucleotide synthesis and can change folate handling; this can be reflected in related lab markers. Alleles tied to relatively lower activity may reduce one‑carbon flux, which can be associated with altered folate biomarkers or higher homocysteine in some people. Interpretation requires the full Foundation Zoomer context—folate, B12, homocysteine, and other methylation gene variants—to understand overall pathway balance and risk patterns.

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SHMT1 rs1979277 is included in the Foundation Zoomer’s methylation genetics panel to clarify how inherited variation may influence folate‑dependent one‑carbon flow. It helps providers interpret folate, B12, and homocysteine results alongside other genetic markers, supporting more precise assessment of methylation capacity and nutrient–gene interactions for individualized care planning.

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SHMT1 rs1979277 FAQs

What is SHMT1 rs1979277 and why is it important?

SHMT1 rs1979277 is a specific genetic difference in the SHMT1 gene that can influence how the body processes one‑carbon units from folate. That pathway supports building DNA and supplying methyl groups used in many cellular reactions. Knowing this variant helps explain individual patterns in folate markers and related laboratory results.

What does it mean if my SHMT1 rs1979277 levels are low?

Because this marker is genetic, “low” generally means you carry allele(s) associated with reduced SHMT1 expression or activity. That pattern can be linked with less efficient one‑carbon flow and may be reflected in folate or homocysteine measures. Any single genetic finding is best interpreted with the rest of your Foundation Zoomer results and clinical context.

What does it mean if my SHMT1 rs1979277 levels are high?

“High” typically refers to allele(s) associated with relatively greater SHMT1 expression or activity. This pattern can shift how one‑carbon units are used between nucleotide production and methylation and may influence related nutrient or biomarker values. Clinical interpretation depends on concurrent folate, B12, homocysteine, and other genetic markers in the full panel.

Why is this biomarker included in the Foundation Zoomer?

SHMT1 rs1979277 helps explain inherited influences on folate‑dependent one‑carbon metabolism, a central pathway for DNA synthesis and methylation. Including it lets providers place genetic predisposition alongside nutrient levels and other methylation genes, improving pattern recognition and personalization of follow‑up testing or monitoring.

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