rs9952977

What is the rs9952977 variant?

rs9952977 is a SNP (single nucleotide polymorphism) in the HTR4 (5-Hydroxytryptamine Receptor 4) gene. It belongs to the Neurotransmitter category and is part of the Histamine & MCAS biological cluster. HTR4 encodes the 5-HT4 receptor in the gut and heart, regulating GI motility and atrial automaticity.

Biological role and pathway

This variant sits within the HTR4 gene, which is involved in the enteric serotonin / GI motility pathway. Genes within the Histamine & MCAS 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: HTR4

rs9952977 is one of 2 known variants in the HTR4 gene. To understand the full biological context of this variant, explore the parent gene page.

Conditions studied in relation to rs9952977

Research into HTR4 variants including rs9952977 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 HTR4 and the rs9952977 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 HTR4 gene

The following variants in HTR4 are also studied in relation to chronic illness and may be analysed together for a more complete picture.

Frequently asked questions