CS Gene
Citrate Synthase (CS) is a gene involved in TCA cycle initiation that has been studied in relation to immune function, metabolism, and chronic illness. Variants in CS 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 CS gene?
CS encodes citrate synthase, a protein involved in TCA cycle initiation. It belongs to the Metabolic category and is part of the Mitochondrial Energy Production & PEM biological cluster. CS encodes citrate synthase, the enzyme that initiates the TCA cycle by condensing oxaloacetate and acetyl-CoA to form citrate.
Biological role and pathway
CS is involved in the TCA cycle initiation pathway, which plays a central role in regulating physiological processes relevant to immune defence, cellular energy, and systemic homeostasis. Genes within the Mitochondrial Energy Production & PEM 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.
CS and Long COVID / ME-CFS research
Citrate synthase activity is a marker of mitochondrial density; variants may reflect mitochondrial capacity and affect the energy deficit in Long COVID and ME/CFS.
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 CS gene have been studied in relation to metabolic and chronic illness. Each variant represents a single nucleotide position where individuals may carry different alleles.
- rs1568— CS variant
Conditions studied in relation to CS
Research into CS variants has explored associations with the following conditions. These are areas of scientific investigation and do not imply that CS 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 CS and related genes in the mitochondrial energy production & pem 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 Mitochondrial Energy Production & PEM pathway
CS 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 CS gene and what does it do?
CS (Citrate Synthase) is involved in TCA cycle initiation. CS encodes citrate synthase, the enzyme that initiates the TCA cycle by condensing oxaloacetate and acetyl-CoA to form citrate.
How may CS gene variants relate to Long COVID or ME/CFS?
Citrate synthase activity is a marker of mitochondrial density; variants may reflect mitochondrial capacity and affect the energy deficit in Long COVID and ME/CFS.
Can a DNA test reveal information about my CS 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 CS 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 CS. This is not an exhaustive literature review.
- [1]PMID: 34316049
- [2]Nature Genetics
- [3]Cell Metabolism