CCR2 rs1799863: What Your Genotype Means
The rs1799863 variant, commonly known as CCR2 V64I, is a genetic change in the CCR2 gene that alters a single amino acid in the receptor protein. This variant has been studied for its potential influence on immune system function, including the progression of HIV-1 infection and susceptibility to certain inflammatory and oncological conditions.
What each genotype means
Typical chemokine receptor function
You carry two copies of the common C allele, encoding the standard valine at amino acid position 64 (Val64Val). Research indicates that this genotype is associated with baseline immune receptor signaling and standard progression rates if exposed to certain chronic viral infections such as HIV-1, without the modest deceleration linked to the 64I allele. Studies evaluating its impact on chronic inflammation and cancer show mixed results across diverse ancestries, reflecting a standard baseline risk rather than a definitive health effect.
Carried by approximately 75% to 80% of individuals of European ancestry and roughly 55% to 60% of East Asian populations.
Heterozygous altered receptor profile
You carry one copy of the T allele (commonly annotated as CCR2-V64I or Val64Ile), which leads to an isoleucine substitution in the first transmembrane domain of CCR2. In historical natural-history cohorts, carriers of this genotype demonstrated a statistical delay in HIV-1 disease progression, though this association has limited clinical significance in the era of modern antiretroviral therapy. Associations with inflammatory conditions, metabolic markers, and cancer susceptibility remain preliminary and inconsistent across different ancestral groups.
Carried by roughly 18% to 20% of people of European ancestry and up to 35% to 40% of individuals of East Asian ancestry.
Homozygous altered receptor profile
You carry two copies of the T allele (homozygous Ile64Ile). While early functional investigations suggested this variant might alter coreceptor dynamics or track protective haplotypes in linked chemokine receptor regions, overall clinical evidence for a major independent health impact remains limited. Published associations with altered risks for inflammatory disorders or viral progression reflect population-level statistical correlations rather than direct clinical diagnoses.
Found in approximately 1% of individuals of European ancestry and around 4% to 7% of East Asian populations.
Understanding the Variant
The rs1799863 variant is a single nucleotide polymorphism (SNP) located within the CCR2 gene. In this specific position, a valine (V) is replaced by an isoleucine (I) at codon 64 of the protein. Because this change occurs in the coding region of the gene, it can potentially alter the structure or stability of the resulting protein. Scientists track this variant to understand how subtle changes in our genetic code can influence the behavior of immune cells. While the variant is well-documented in scientific literature, it is important to note that the presence of this SNP does not guarantee any specific health outcome. Instead, it represents a variation that may shift the baseline activity of certain immune pathways, making it a subject of interest in studies regarding how our bodies respond to viral infections and chronic inflammation.
The Role of the CCR2 Gene
The CCR2 gene provides instructions for making a protein called the C-C motif chemokine receptor 2. This receptor sits on the surface of various immune cells, including monocytes and macrophages. Its primary job is to act as a sensor, binding to specific signaling molecules called chemokines, such as CCL2. When these molecules bind to the receptor, they trigger a cascade of signals that direct immune cells to move toward sites of infection or tissue damage. This process, known as chemotaxis, is essential for a healthy immune response. Beyond simple movement, CCR2 signaling is involved in complex processes like blood vessel remodeling and the differentiation of specific T-cells. Because it is a central hub for immune communication, variations in the CCR2 gene can theoretically influence how effectively the body manages inflammation and responds to external threats.
Research and Associations
Research into rs1799863 has produced a wide range of findings, some of which are conflicting. Historically, the variant gained attention for its association with a delay in the progression from HIV-1 infection to AIDS. Studies suggest that the 64I version of the receptor may interfere with the expression of CCR5, another receptor used by HIV to enter cells, thereby potentially slowing the virus. In other areas, such as cancer susceptibility, the evidence is mixed. Some meta-analyses have indicated that the variant might be associated with an increased risk for certain cancers, such as bladder or oral cancer, while potentially offering protection against others. Additionally, some research has linked the variant to abdominal aortic aneurysms. Because these studies often show different results across various ethnic groups and disease contexts, the clinical significance of this variant remains limited and is not currently used for routine diagnostic purposes.
What This Information Means for You
If you have information about your rs1799863 genotype, it is important to view it as a single piece of a much larger biological puzzle. Genetic variants rarely act in isolation; your overall health is determined by a complex interplay of your entire genome, your environment, and your lifestyle choices. You cannot use this information to diagnose yourself or predict future health outcomes with certainty. If you are concerned about your risk for specific conditions mentioned in research, such as inflammatory diseases or viral susceptibility, the best course of action is to consult with a healthcare professional. They can provide context based on your personal and family medical history. Never make changes to your medical care or medication regimen based on genetic data without first discussing it with your doctor or a qualified genetic counselor.
How common is this variant?
The minor allele frequency for rs1799863 is approximately 0.10 in European populations, 0.15 in South Asian populations, and 0.25 in East Asian populations.
Frequently asked questions
Is the CCR2 V64I variant a disease-causing mutation?
No, it is not considered a disease-causing mutation. It is a common genetic polymorphism, meaning it is a natural variation found in a significant portion of the healthy population.
Does having the I allele mean I am protected from HIV?
Research has suggested that the I allele may be associated with a slower progression of HIV-1 to AIDS, but it does not provide immunity to HIV infection. You should continue to follow standard medical advice for HIV prevention and care.
Should I get tested for this variant?
There is currently no clinical recommendation to test for this variant. It is primarily studied in research settings to understand immune function and is not used for routine medical screening.
Can I change my risk associated with this variant?
Genetic variants are fixed at birth. However, you can manage your overall health through lifestyle choices like a balanced diet, regular exercise, and routine medical check-ups, which are far more impactful on your health than any single SNP.
Sources & further reading
Educational information only, last refreshed 10/19/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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