HLA-DQA1 rs2187668: Understanding Your Genetic Marker
The rs2187668 variant is a single-nucleotide polymorphism located within the HLA-DQA1 gene. It is widely recognized in scientific literature as a 'tag' SNP, meaning it serves as a genetic proxy for specific HLA alleles associated with susceptibility to various autoimmune conditions.
What each genotype means
Increased autoimmune susceptibility
This genotype is associated with a higher statistical risk for certain autoimmune conditions, including systemic lupus erythematosus and celiac disease. This variant acts as a tag for the HLA-DRB1*0301 allele, which is linked to immune-related susceptibility. Please note that these associations are based on population-level data and do not indicate a diagnosis.
This genotype is less common than the heterozygous state in many populations, though specific frequencies vary significantly by ancestry.
Moderately increased autoimmune risk
Carrying one copy of this variant is associated with a somewhat increased statistical risk for autoimmune disorders such as lupus and celiac disease. This genotype serves as a marker for the HLA-DRB1*0301 allele, which is involved in immune system regulation. These findings reflect broad population trends rather than individual health outcomes.
This is a relatively common genotype in many European populations where the variant has been studied.
Average risk profile
This genotype is considered the baseline or average profile regarding the specific autoimmune associations linked to this variant. It does not carry the same statistical association with the HLA-DRB1*0301 allele as the A allele. This result should be interpreted as part of your overall genetic background rather than a specific health indicator.
This is the most frequently observed genotype in many populations studied for this variant.
What is rs2187668 and Where is it Located?
The variant rs2187668 is a specific change in the DNA sequence located on chromosome 6 at position 32,638,107. This region is part of the human leukocyte antigen (HLA) complex, a highly variable and complex area of the genome that plays a critical role in the immune system. Because this SNP is situated in a region characterized by strong linkage disequilibrium, it is frequently inherited alongside other nearby genetic variations. In genetic research, rs2187668 is often used as a marker to identify the presence of the HLA-DRB1*0301 allele. By tracking this single point in the genome, researchers can infer the presence of larger, more complex immune-related haplotypes that are difficult to sequence directly. It is important to note that while this SNP is a useful tool for population-level studies, it is a marker for these larger genetic structures rather than the direct cause of the associated traits itself.
The Role of the HLA-DQA1 Gene
The HLA-DQA1 gene provides instructions for making a protein that is part of the HLA-DQ MHC class II cell surface receptor. These receptors are essential for the immune system's ability to distinguish between the body's own proteins and foreign invaders like bacteria or viruses. By presenting protein fragments to T-cells, the HLA-DQ receptor helps initiate an appropriate immune response. Because of its central role in immune surveillance, variations in HLA-DQA1 and its partner genes are heavily involved in how the body reacts to environmental triggers. When these receptors are structured differently due to genetic variation, they may inadvertently present self-proteins to the immune system, which is a suspected mechanism in the development of certain autoimmune disorders. Consequently, HLA-DQA1 is a primary focus in studies regarding organ transplantation compatibility, autoimmune disease risk, and general immune system function.
Research Associations and Evidence Strength
Research has consistently identified rs2187668 as being associated with several autoimmune and inflammatory conditions, including systemic lupus erythematosus, celiac disease, sarcoidosis, and idiopathic membranous nephropathy. The evidence for these associations is considered moderate to strong, as the variant has been replicated across multiple studies and diverse populations, including European, Caucasian, and Chinese cohorts. For instance, the 'A' allele has been identified as a risk factor in various meta-analyses regarding autoimmune susceptibility. However, the strength of these associations can vary significantly depending on the specific disease and the ancestry of the population being studied. Some studies have noted that the association with conditions like membranous nephropathy may be more pronounced in specific ethnic groups, highlighting the complexity of the HLA region. It is essential to understand that these findings represent statistical correlations observed in large groups and do not imply that an individual with a specific genotype will necessarily develop a particular condition.
What You Can and Cannot Do With This Information
Genetic information regarding rs2187668 is primarily intended for educational and research purposes. While this SNP is a well-documented marker for immune-related traits, it is not a diagnostic tool. Having a specific genotype does not mean you have or will develop an autoimmune disease, nor does the absence of a risk allele guarantee protection. Autoimmune conditions are complex, multifactorial, and influenced by a combination of genetics, environment, and lifestyle factors. If you are concerned about your health or potential risks for autoimmune conditions, you should consult with a qualified healthcare professional or a genetic counselor who can interpret your results in the context of your personal and family medical history. Never use genetic data to make medical decisions, change medications, or alter your lifestyle without professional guidance. Always discuss any health-related questions or concerns with your clinician.
How common is this variant?
The frequency of the rs2187668 alleles varies significantly across different global populations, reflecting the diverse evolutionary history of the HLA region. Specific frequency data is not universally recorded, but the variant is widely studied in European and Asian cohorts.
Frequently asked questions
Is rs2187668 a diagnostic test for celiac disease?
No, rs2187668 is not a diagnostic test. While it is a marker associated with the HLA haplotypes that increase the risk of celiac disease, a diagnosis requires clinical evaluation, blood tests, and often a biopsy performed by a medical professional.
Does having the A allele mean I will get lupus?
No, having the A allele does not mean you will develop lupus. It is a statistical marker associated with increased risk, but most people with this variant will never develop the condition, as autoimmune diseases are influenced by many other genetic and environmental factors.
Can I use this SNP to check my organ transplant compatibility?
No, clinical HLA typing for organ transplantation is a highly specialized process that requires precise laboratory testing of multiple HLA genes. A single SNP like rs2187668 is insufficient for determining transplant compatibility.
Why is this SNP called a 'tag' SNP?
It is called a tag SNP because it is in strong linkage disequilibrium with other nearby genetic variations. Researchers use it as a proxy to identify larger, more complex genetic regions, such as specific HLA alleles, without needing to sequence the entire area.
Sources & further reading
Educational information only, last refreshed 10/7/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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HLA-DQA1 variant strongly associated with celiac disease and gluten sensitivity.
MHC class II regulatory variant strongly linked to aeroallergen sensitization and peanut allergy susceptibility.
Tagging SNP strongly linked to the HLA-DQ2.5 heterodimer which predisposes carriers to celiac disease.
Variant in the HLA class II region strongly associated with risk of celiac disease, type 1 diabetes, and autoimmune thyroiditis.
Variant in the HLA-DQA1/DRB1 locus significantly associated with peanut allergy and tree nut allergy susceptibility in genome-wide association studies.
Chromosome 6 major histocompatibility complex variant identified in genome-wide association studies of extreme human longevity.