What is rs225014 (DIO2) nd Why Does the Nutrient Zoomer Test for It?

Thyroid hormone-activating enzyme variant

rs225014 is a single nucleotide variant in the DIO2 gene that can alter the type II deiodinase enzyme responsible for converting inactive T4 into active T3 inside cells. Testing this variant helps explain individual differences in cellular thyroid activation and how those differences may interact with nutrient status and metabolic patterns.

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rs225014 (DIO2)

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About rs225014 (DIO2)

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About rs225014 (DIO2)

Overview and History

rs225014 is a common single nucleotide polymorphism (SNP) in the DIO2 gene that results in an amino-acid change (Thr92Ala) in the type II deiodinase enzyme. DIO2 is a selenoprotein that performs local conversion of thyroxine (T4) to the more active triiodothyronine (T3) in tissues such as brain, muscle, and fat. The variant was identified in genetic screens and subsequently studied for effects on enzyme behavior and cellular thyroid signaling. Research has linked the change to altered enzyme localization and subtle shifts in intracellular T3 availability, which can influence tissue-specific hormone action and metabolic regulation.

Interpreting Highs and Lows

When the allele associated with reduced DIO2 function is present, it may suggest lower local conversion capacity of T4 to T3 in some tissues; this is an association, not a diagnosis. Conversely, the common allele linked to typical DIO2 sequence is generally associated with standard conversion capacity. Interpretation depends on clinical context: circulating thyroid hormone levels, other genetic variants, and nutrient cofactors (for example, those required for deiodinase activity) all modify how the genotype relates to physiology.

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The Nutrient Zoomer includes rs225014 to clarify inherited differences in cellular thyroid activation that can interact with nutrient status and metabolic patterns. Knowing this variant helps providers interpret thyroid-related findings alongside nutrient cofactors and metabolic markers, supporting more personalized nutrition and monitoring strategies.

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rs225014 (DIO2) FAQs

What is rs225014 (DIO2) and why is it important?

rs225014 is a genetic variant in the DIO2 gene that changes the structure of the type II deiodinase enzyme. That enzyme helps cells convert the inactive thyroid hormone (T4) into active T3. The variant can influence how much active hormone is available inside certain tissues, which may affect energy, metabolism, and response patterns seen on nutrient testing.

What does it mean if my rs225014 (DIO2) levels are low?

For a genetic marker like rs225014, “low” typically refers to carrying the allele linked to reduced enzyme function. That pattern is associated with lower local conversion of T4 to T3 in some tissues, which can show up as differences in energy, metabolic markers, or symptom patterns. Results are most meaningful when combined with thyroid labs, nutrient measurements, and other genetic data from the full panel.

What does it mean if my rs225014 (DIO2) levels are high?

If your genotype is the form not associated with reduced function, it generally indicates typical or preserved DIO2 activity and expected local conversion capacity. Elevated or typical activity on its own does not confirm clinical status; interpretation requires thyroid hormone levels, nutrient cofactors, and the rest of the Nutrient Zoomer data to understand the full picture.

Why is this biomarker included in the Nutrient Zoomer?

rs225014 is included because it helps explain inherited variation in tissue-level thyroid activation that can interact with nutrient status and metabolic patterns. Combining this genetic insight with direct nutrient and metabolic measurements enables providers to identify mismatches between circulating hormones, cellular activation, and nutrient cofactors—supporting more precise, personalized nutrition and monitoring.

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