HLA-DQB1 rs114388793: Understanding MHC Region Associations
The rs114388793 variant is located within the HLA-DQB1 gene, a critical component of the human major histocompatibility complex (MHC). This variant has been identified in genome-wide association studies as having potential links to idiopathic inflammatory myopathies and other immune-related conditions.
What each genotype means
Typical inflammatory risk profile
You carry two copies of the common C allele at rs114388793, which is typical for the majority of the population. This genotype is not associated with the increased statistical predisposition to autoimmune inflammatory myopathies linked to the minor ancestral HLA haplotype. Having this baseline profile does not guarantee protection against autoimmune or muscle disorders, as overall health is influenced by many complex genetic and environmental factors.
Carried by roughly 70% to 80% of individuals of European ancestry, and generally more common across most non-European populations.
Moderately elevated autoimmune susceptibility
You carry one copy of the ancestral T allele, which acts as a tag for extended ancestral HLA class II haplotypes. In published genome-wide association studies, this allele correlates with a moderately increased statistical risk of inflammatory myopathies, including polymyositis and dermatomyositis. This reflects a statistical association in population research rather than a diagnosis, and most individuals carrying this variant never develop an autoimmune condition.
Carried by approximately 15% to 25% of individuals of European ancestry; observed at lower frequencies in other global ancestries.
Elevated autoimmune susceptibility
You carry two copies of the ancestral T allele associated with specific ancestral HLA haplotypes in the major histocompatibility complex region. Population genetics studies indicate that homozygosity for this allele is associated with a higher relative statistical predisposition to inflammatory myopathies compared to non-carriers. Because autoimmune conditions involve complex environmental triggers and numerous genetic loci, carrying two copies does not mean you will develop any condition.
Carried by roughly 1% to 3% of individuals of European ancestry, and is comparatively rare in other populations.
What is rs114388793?
The rs114388793 variant is a single-nucleotide polymorphism (SNP) situated within the HLA-DQB1 gene. SNPs are the most common type of genetic variation among people, representing a difference in a single DNA building block, or nucleotide. This specific variant resides in the MHC region on chromosome 6, an area of the genome known for its extreme complexity and high density of genes involved in immune system regulation. Because this region is highly polymorphic, meaning it contains many variations, researchers study these specific markers to understand how genetic architecture influences susceptibility to various autoimmune and inflammatory diseases. The rs114388793 marker serves as a focal point for investigating how specific inherited sequences in the MHC region may correlate with the body's inflammatory responses.
The Role of HLA-DQB1
The HLA-DQB1 gene provides instructions for making a protein that is part of the HLA class II family. These proteins are essential for the immune system to distinguish between the body's own proteins and foreign invaders like bacteria or viruses. By presenting peptide fragments to T-cells, HLA-DQB1 helps initiate an appropriate immune response. Because of this central role in immune surveillance, variations in the HLA-DQB1 gene are frequently studied in the context of autoimmune disorders. When the immune system misidentifies self-tissues as foreign, it can lead to chronic inflammation. Research into HLA-DQB1 has linked various alleles to conditions such as type 1 diabetes, celiac disease, and idiopathic inflammatory myopathies, highlighting the gene's importance in maintaining immune homeostasis and the potential consequences when its function is altered by genetic variation.
Research and Associations
Current research, including data from the GWAS Catalog, highlights rs114388793 as a variant of interest within the MHC region. Studies have observed statistical associations between this region and idiopathic inflammatory myopathies, which are a group of disorders characterized by muscle inflammation and weakness. It is important to note that these findings are based on population-level statistical associations rather than direct causation. The evidence strength for this specific variant is considered moderate, as the MHC region is notoriously difficult to map due to high levels of linkage disequilibrium, where multiple variants are inherited together. Consequently, while the association is statistically significant in certain cohorts, it does not imply that the variant itself is the sole driver of disease. Further functional studies are required to clarify the biological mechanisms connecting this specific SNP to clinical outcomes.
Population Frequency
The frequency of the rs114388793 variant varies across different ancestral groups, which is a common characteristic of variants located in the MHC region. In European ancestry populations, the minor allele frequency is typically observed between 0.09 and 0.18. These frequencies are derived from large-scale genomic databases that aggregate data from diverse individuals. Because the MHC region is subject to strong evolutionary pressures related to pathogen defense, the distribution of these alleles can differ significantly between populations globally. Understanding these frequency differences is crucial for researchers to avoid bias in genetic studies and to ensure that findings regarding disease risk are applicable across diverse groups. Readers should be aware that population frequency data is descriptive and does not predict an individual's personal health status.
Interpreting Genetic Information
Genetic information regarding variants like rs114388793 is intended for educational purposes and should not be used for medical diagnosis or personal health management. While genome-wide association studies provide valuable insights into the genetic architecture of complex diseases, they represent statistical probabilities rather than definitive medical predictions. Many factors, including environmental exposures, lifestyle, and the interaction of thousands of other genetic variants, contribute to the development of inflammatory conditions. If you have concerns about your health or family history of autoimmune disease, it is essential to consult with a qualified healthcare professional or a genetic counselor. They can provide context based on your specific clinical history and help you understand what genetic testing results mean for you. Never make changes to your medical care or medication regimen based on information found in genetic databases.
How common is this variant?
The minor allele frequency for rs114388793 is approximately 0.09 to 0.18 in European ancestry groups, reflecting common variation within the MHC region.
Frequently asked questions
Is rs114388793 a cause of myositis?
No, rs114388793 is not considered a direct cause of myositis. It is a genetic marker associated with the condition through statistical studies, meaning it appears more frequently in affected groups, but it does not guarantee the development of the disease.
Can I use this SNP to predict my risk of autoimmune disease?
No, this SNP cannot be used to predict your personal risk of autoimmune disease. Complex diseases are influenced by many genetic and environmental factors, and a single variant provides very little information on its own.
What is the MHC region?
The MHC region is a cluster of genes on chromosome 6 that plays a vital role in the immune system. It helps the body recognize foreign invaders and is highly variable between individuals.
Where can I find more information about HLA-DQB1?
You can find authoritative information about the HLA-DQB1 gene on the NCBI Gene database or the GWAS Catalog. These resources provide detailed summaries of the gene's function and its known associations with various health conditions.
Sources & further reading
Educational information only, last refreshed 10/13/2026. Not medical advice — these associations describe population statistics, not individual predictions.
Curious what your genotype is for rs114388793?
Upload a raw DNA file from 23andMe, AncestryDNA, MyHeritage, or FamilyTreeDNA and see this variant — plus thousands more — interpreted in your full report.
Get my report — $29Related variants in HLA-DQB1
This variant in the HLA-DQB1 region is associated with peanut allergy susceptibility, reflecting the broader role of HLA class II variation in food allergy risk.
This variant is associated with susceptibility to asthma, seasonal allergic rhinitis, and Kawasaki disease.
Genetic variant in the HLA-DQB1 region associated with various autoimmune and inflammatory conditions.
Tag SNP within the major histocompatibility complex class II locus displaying strong association with susceptibility to Type 1 diabetes.
HLA class II region polymorphism exhibiting ancestry-specific risk architecture for peanut allergy.
Class II HLA-DQB1 variant exhibiting robust genome-wide association with IgE-mediated peanut allergy and egg sensitization.