TH Gene

What is the TH gene?

TH encodes tyrosine hydroxylase, a protein involved in catecholamine biosynthesis. It belongs to the Neurotransmitter category and is part of the Autonomic Nervous System biological cluster. TH encodes tyrosine hydroxylase, the rate-limiting enzyme in the biosynthesis of dopamine, norepinephrine, and epinephrine.

Biological role and pathway

TH is involved in the catecholamine biosynthesis pathway, which plays a central role in regulating physiological processes relevant to immune defence, cellular energy, and systemic homeostasis. Genes within the Autonomic Nervous System 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 TH gene have been studied in relation to neurotransmitter and chronic illness. Each variant represents a single nucleotide position where individuals may carry different alleles.

• rs10770141— TH variant

Conditions studied in relation to TH

Research into TH variants has explored associations with the following conditions. These are areas of scientific investigation and do not imply that TH 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 TH and related genes in the autonomic nervous system 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 Autonomic Nervous System pathway

TH 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