HTR2A Gene

What is the HTR2A gene?

HTR2A encodes 5-hydroxytryptamine receptor 2a, a protein involved in serotonin post-synaptic signaling. It belongs to the Neurotransmitter category and is part of the Neurological & Cognitive Function biological cluster. HTR2A encodes the 5-HT2A serotonin receptor, a Gq-coupled receptor involved in sensory perception, mood, and cognition.

Biological role and pathway

HTR2A is involved in the serotonin post-synaptic signaling pathway, which plays a central role in regulating physiological processes relevant to immune defence, cellular energy, and systemic homeostasis. Genes within the Neurological & Cognitive Function 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 HTR2A gene have been studied in relation to neurotransmitter and chronic illness. Each variant represents a single nucleotide position where individuals may carry different alleles.

• rs6311— HTR2A variant
• rs6313— HTR2A variant
• rs7997012— HTR2A variant

Conditions studied in relation to HTR2A

Research into HTR2A variants has explored associations with the following conditions. These are areas of scientific investigation and do not imply that HTR2A 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 HTR2A and related genes in the neurological & cognitive function 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 Neurological & Cognitive Function pathway

HTR2A 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