AHCY Gene
Adenosylhomocysteinase (AHCY) is a gene involved in one-carbon metabolism that has been studied in relation to immune function, metabolism, and chronic illness. Variants in AHCY may influence how the body responds to infection, inflammation, and long-term recovery.
This page is for educational and informational purposes only. Not a diagnostic tool. Always consult a qualified healthcare provider.
What is the AHCY gene?
AHCY encodes adenosylhomocysteinase, a protein involved in one-carbon metabolism. It belongs to the Methylation category and is part of the Methylation & Neurotransmitters biological cluster. AHCY encodes S-adenosylhomocysteine hydrolase, which converts SAH to homocysteine, regulating methylation reactions.
Biological role and pathway
AHCY is involved in the one-carbon metabolism pathway, which plays a central role in regulating physiological processes relevant to immune defence, cellular energy, and systemic homeostasis. Genes within the Methylation & Neurotransmitters 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.
AHCY and Long COVID / ME-CFS research
AHCY activity controls the ratio of SAM/SAH, the primary indicator of methylation capacity, which may be disrupted in Long COVID metabolic dysfunction.
This information is based on published research and does not constitute medical advice. See references below.
Known genetic variants
The following variants (SNPs) in the AHCY gene have been studied in relation to methylation and chronic illness. Each variant represents a single nucleotide position where individuals may carry different alleles.
- rs41301825— AHCY variant
Conditions studied in relation to AHCY
Research into AHCY variants has explored associations with the following conditions. These are areas of scientific investigation and do not imply that AHCY 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 AHCY and related genes in the methylation & neurotransmitters 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 Methylation & Neurotransmitters pathway
AHCY 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
What is the AHCY gene and what does it do?
AHCY (Adenosylhomocysteinase) is involved in one-carbon metabolism. AHCY encodes S-adenosylhomocysteine hydrolase, which converts SAH to homocysteine, regulating methylation reactions.
How may AHCY gene variants relate to Long COVID or ME/CFS?
AHCY activity controls the ratio of SAM/SAH, the primary indicator of methylation capacity, which may be disrupted in Long COVID metabolic dysfunction.
Can a DNA test reveal information about my AHCY gene?
Consumer DNA data from 23andMe, AncestryDNA, and MyHeritage includes SNP variants for many genes. ChronicDNA analyses your raw DNA file and reports on variants that have been studied in relation to chronic illness, immune function, and metabolism. This is not a diagnostic service — results are informational and educational only.
Explore your AHCY genetic insights
Upload your DNA data from 23andMe, AncestryDNA, or MyHeritage and receive a personalised report covering >80 genes relevant to Long COVID and ME/CFS.
Get Your Personalised DNA ReportInformational and educational only · Not a diagnostic tool · GDPR compliant
References
The following publications were used in compiling the research context for AHCY. This is not an exhaustive literature review.
- [1]PMID: 9694677
- [2]Nature Genetics
- [3]Journal of Clinical Investigation