rs12885300

What is the rs12885300 variant?

rs12885300 is a SNP (single nucleotide polymorphism) in the DIO2 (Iodothyronine Deiodinase 2) gene. 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

This variant sits within the DIO2 gene, which is involved in the thyroid hormone activation pathway. 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 — particularly under conditions of physiological stress such as viral infection or prolonged illness.

Parent gene: DIO2

rs12885300 is one of 2 known variants in the DIO2 gene. To understand the full biological context of this variant, explore the parent gene page.

Conditions studied in relation to rs12885300

Research into DIO2 variants including rs12885300 has explored associations with the following conditions. These are areas of scientific investigation and do not imply causation.

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 the rs12885300 variant.

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.

Other variants in the DIO2 gene

The following variants in DIO2 are also studied in relation to chronic illness and may be analysed together for a more complete picture.

Frequently asked questions