HLA-B rs59440261: What Your Genotype Means
The rs59440261 variant is a genetic marker located within the HLA-B region on chromosome 6. It has been studied for its potential association with HIV-1 viral load set points and the rate of disease progression in individuals living with HIV.
What each genotype means
Protective HIV viral load association
This genotype is associated with a protective effect regarding HIV-1 set-point viral load. Research indicates that individuals carrying this variant may exhibit lower viral set points, which is a factor in HIV disease progression. Please discuss any health concerns or clinical implications with your healthcare provider.
This genotype is rare, with the minor allele frequency for rs59440261 reported at approximately 0.06 in populations of European ancestry.
Protective HIV viral load association
This genotype is associated with a protective effect regarding HIV-1 set-point viral load. Research indicates that individuals carrying this variant may exhibit lower viral set points, which is a factor in HIV disease progression. Please discuss any health concerns or clinical implications with your healthcare provider.
This genotype is rare, with the minor allele frequency for rs59440261 reported at approximately 0.06 in populations of European ancestry.
Typical HIV viral load association
This is the more common genotype at this position in the HLA-B region. It does not carry the protective association linked to the alternative allele regarding HIV-1 set-point viral load. Please discuss any health concerns or clinical implications with your healthcare provider.
This is the major genotype, carried by the vast majority of individuals in most studied populations.
Understanding the Variant and Its Location
The rs59440261 variant is a single-nucleotide polymorphism (SNP) situated in the human leukocyte antigen (HLA) region on chromosome 6. This region is highly complex and plays a critical role in the immune system by encoding proteins that help the body distinguish between its own cells and foreign invaders, such as viruses. Because this area of the genome is dense with genes involved in immune regulation, variations here are frequently investigated for their influence on how the body responds to infectious diseases. The rs59440261 marker is specifically located in proximity to other well-studied HLA-B variants that have been linked to immune control of viral infections. Researchers track these specific locations to better understand the genetic architecture of immune responses.
The Role of the HLA-B Gene
The HLA-B gene is part of the major histocompatibility complex (MHC) class I family. These genes provide instructions for making proteins that sit on the surface of cells and present small pieces of proteins (peptides) to T cells. If a T cell recognizes a peptide as foreign—such as a piece of a virus—it triggers an immune response to eliminate the infected cell. Because different versions of HLA-B proteins can bind to different viral peptides, the specific genetic makeup of an individual's HLA-B region can influence how effectively their immune system detects and controls viruses like HIV-1. Variations in this gene are therefore central to research regarding why some individuals may control viral replication more effectively than others.
Research Associations and Evidence Strength
Scientific research has identified rs59440261 as having a nominal association with HIV-1 viral load set points and disease progression. Studies, including metagenome-wide association studies, have observed that this SNP often appears in linkage disequilibrium with other protective HLA-B markers, such as those linked to the HLA-B*57:01 allele. While these findings suggest a potential role in immune control, the evidence is considered moderate. It is important to note that genetic associations in the HLA region are often complex and can vary significantly between different ancestral populations. Furthermore, while some studies have shown statistical correlations, these markers do not act in isolation; the overall control of HIV-1 is influenced by a combination of host genetics, viral factors, and environmental variables.
Population Frequency
The rs59440261 variant is classified as rare. Its frequency can vary significantly across different global populations, which is a common characteristic of variants located within the highly diverse HLA region. Because of its rarity, large-scale studies are often required to confirm its specific impact across diverse ancestral groups.
What This Information Means for You
It is important to understand that genetic markers like rs59440261 are tools for scientific research and population-level studies, not diagnostic tests for individuals. Having a specific genotype at this location does not determine your health outcomes or your body's response to any infection. If you are living with HIV or have concerns about your immune health, this genetic information should not be used to guide medical decisions. Always consult with your healthcare provider or an infectious disease specialist regarding your health, testing, and treatment options. They are the only ones who can provide personalized medical advice based on your clinical history and current health status.
How common is this variant?
The rs59440261 variant is considered rare, with frequencies that differ across various ancestral populations.
Frequently asked questions
Can this genetic test tell me if I will get AIDS?
No. This genetic marker is only one of many factors involved in HIV progression. Clinical outcomes are determined by a complex interplay of viral, environmental, and host factors, and this SNP cannot predict individual health outcomes.
Is rs59440261 a diagnostic test for HIV?
No. This is a research-grade genetic marker used in scientific studies to understand immune function. It is not a diagnostic tool for detecting HIV infection.
Should I change my medication based on this result?
Absolutely not. You should never change your medication or treatment plan based on genetic information without consulting your doctor or pharmacist. Always discuss your medical care with a qualified healthcare professional.
Why is the HLA region so important in HIV research?
The HLA region encodes proteins that are essential for the immune system to recognize and fight viruses. Variations in these genes can change how effectively the immune system presents viral pieces to T cells, which influences how the body controls viral replication.
Sources & further reading
Educational information only, last refreshed 10/3/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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This variant is located in the HLA-B region and is associated with immune response variability and susceptibility to various autoimmune conditions.
Variant in the HLA-B locus associated with immune response and inflammatory disease susceptibility.
Variant residing within the human leukocyte antigen complex associated with autoimmune disorders and differential immune response.
Variant in the HLA-B region associated with immune response and drug hypersensitivity reactions.
Cross-ancestral HLA locus variant conferring consistent risk for oropharyngeal carcinoma across European and admixed ancestry cohorts.
This SNP is located in the 3' region of the HLA-B gene and is associated with HIV-1 controller phenotypes.