DIO2 Gene

What is the DIO2 gene?

DIO2 encodes iodothyronine deiodinase 2, a protein involved in thyroid hormone activation. It belongs to the Metabolic category and is part of the Metabolic Regulation biological cluster. DIO2 encodes type 2 deiodinase, which activates T4 to the active T3 form locally in peripheral tissues including the brain and pituitary.

Biological role and pathway

DIO2 is involved in the thyroid hormone activation pathway, which plays a central role in regulating physiological processes relevant to immune defence, cellular energy, and systemic homeostasis. Genes within the Metabolic Regulation cluster work together to maintain balanced function across interconnected biological systems.

Variants in genes within this pathway may influence an individual's predisposition to altered function in these systems — particularly under conditions of physiological stress such as viral infection or prolonged illness.

Known genetic variants

The following variants (SNPs) in the DIO2 gene have been studied in relation to metabolic and chronic illness. Each variant represents a single nucleotide position where individuals may carry different alleles.

• rs225014— DIO2 variant
• rs12885300— DIO2 variant

Conditions studied in relation to DIO2

Research into DIO2 variants has explored associations with the following conditions. These are areas of scientific investigation and do not imply that DIO2 causes or treats any condition.

Genetic insights from DNA data

Consumer DNA files from 23andMe, AncestryDNA, and MyHeritage contain raw SNP data. When you upload your file to ChronicDNA, the analysis engine checks your genotype against a curated panel of 80+ genes selected for their relevance to Long COVID, ME/CFS, and connected biological pathways - some of which may include DIO2 and related genes in the metabolic regulation pathway.

The report is educational - it explains which variants you carry, what the research says about them, and how they fit into the biological pathways most relevant to chronic illness. Results are presented in plain English with appropriate scientific context, no medical jargon, no scare tactics. All results should be discussed with a qualified healthcare provider.

Related genes in the Metabolic Regulation pathway

DIO2 does not act in isolation. The following genes are functionally related and may be analysed together for a more complete picture of your genetic predispositions.

Frequently asked questions