C3AR1 rs7842: Understanding Your Genetic Variant
The rs7842 variant is a single nucleotide polymorphism located within the C3AR1 gene. It has been studied for its potential association with differential mRNA expression and susceptibility to coronary artery disease.
What each genotype means
Typical genetic profile
This genotype represents the most common form of this variant observed in many populations. Research into this variant's association with coronary artery disease is ongoing, and this specific genotype is not considered a primary indicator of increased risk.
This is the most frequent genotype found across most global populations.
Intermediate genetic profile
Carrying one copy of the G allele may be associated with subtle differences in C3AR1 mRNA expression levels. While this variant has been linked to coronary artery disease susceptibility in some studies, the clinical significance of this specific genotype remains moderate and requires further investigation.
This genotype is found at varying frequencies depending on ancestral background, appearing in a significant portion of the population.
Variant genetic profile
This genotype is associated with potential changes in C3AR1 gene expression, which has been studied in the context of coronary artery disease susceptibility. Because this association is based on statistical trends in large populations, it does not provide a definitive prediction of individual health outcomes.
This genotype is less common than the AA genotype and shows notable variation in frequency across different global ancestral groups.
What is rs7842 and Where is it Located?
The variant rs7842 is a single nucleotide polymorphism (SNP) situated on chromosome 12. Specifically, it is located within the C3AR1 gene, which encodes the complement C3a receptor 1. In the human genome, this gene is found on the reverse strand of chromosome 12. SNPs like rs7842 represent a single base pair change in the DNA sequence, which can occur in different forms across the human population. Because this variant sits within a gene involved in immune system signaling, researchers have investigated whether this specific change influences how the body regulates certain inflammatory processes. Understanding the location of this variant is the first step in determining how it might interact with the surrounding genetic architecture to influence biological traits.
The Role of the C3AR1 Gene
The C3AR1 gene provides instructions for making the C3a receptor 1 protein. This protein is a G protein-coupled receptor that interacts with C3a, an anaphylatoxin released during the activation of the complement system. The complement system is a vital part of the innate immune response, helping the body clear pathogens and damaged cells. By binding to C3a, the receptor helps mediate inflammatory responses. Because inflammation is a key component in many chronic conditions, including cardiovascular health, the function of C3AR1 is of significant interest to researchers. Variations in this gene, such as rs7842, are hypothesized to potentially alter the expression levels of this receptor, which could theoretically impact how an individual's immune system responds to inflammatory triggers.
Research Associations and Evidence Strength
The association between rs7842 and coronary artery disease (CAD) is considered to have moderate evidence strength. Research, including candidate pathway-based genome-wide association studies, has explored how variants in the complement system might contribute to the risk of developing CAD. Some studies suggest that rs7842 is associated with differential mRNA expression of the C3AR1 gene, implying that the variant might influence how much of the receptor protein is produced. While these findings are scientifically interesting, it is important to note that CAD is a complex, multifactorial condition influenced by a combination of genetics, lifestyle, and environmental factors. The presence of a specific genotype at rs7842 does not guarantee the development of any disease, and the clinical significance of this variant remains a subject of ongoing investigation in the scientific community.
What You Can and Cannot Do With This Information
Genetic information regarding variants like rs7842 is intended for educational purposes and should not be used for medical diagnosis or to guide personal health decisions. Because the evidence linking this variant to coronary artery disease is based on statistical associations in populations, it cannot predict an individual's health outcome. If you are concerned about your cardiovascular health, it is essential to consult with a qualified healthcare provider or a cardiologist. They can evaluate your overall risk profile, including family history, blood pressure, cholesterol levels, and lifestyle factors, which are far more predictive of heart health than any single genetic variant. Never make changes to your medications or health regimen based on genetic test results without first discussing them with your clinician or pharmacist.
How common is this variant?
The frequency of the rs7842 alleles is variable across different global populations, as documented in large-scale genomic databases like gnomAD.
Frequently asked questions
Does having the rs7842 variant mean I will get heart disease?
No. Coronary artery disease is a complex condition influenced by many factors, including diet, exercise, and overall health. A single genetic variant like rs7842 does not determine your health outcome.
Where can I find more information about C3AR1?
You can find detailed information about the C3AR1 gene and its functions on the National Center for Biotechnology Information (NCBI) Gene database or the Ensembl genome browser.
Is rs7842 used in clinical testing?
Currently, rs7842 is primarily a subject of research and is not typically used in routine clinical diagnostic testing for coronary artery disease.
How do I interpret my own genetic data for this SNP?
Genetic data should be interpreted by a healthcare professional or a genetic counselor. They can help you understand your results in the context of your personal and family medical history.
Sources & further reading
Educational information only, last refreshed 9/24/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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