rs1143679 and ITGAM: Understanding Genetic Links to Lupus
The rs1143679 variant is a genetic change located within the ITGAM gene region, which is also associated with the functional element LOC126862331. Research has linked this specific variant to an increased susceptibility to systemic lupus erythematosus (SLE) and variations in cholesterol levels within small HDL particles.
What each genotype means
Typical risk profile
This genotype represents the common, non-risk version of the variant, often referred to as the R77 allele. Research indicates that individuals with this genotype do not carry the specific genetic susceptibility to systemic lupus erythematosus (SLE) associated with the alternative H77 allele. This result does not rule out the possibility of developing SLE, as the condition is complex and influenced by many other genetic and environmental factors.
This is the most common genotype in most global populations.
Increased susceptibility risk
This genotype includes one copy of the risk-associated allele, often referred to as the R77H variant. Studies have shown that this variant, located in the ITGAM gene, can impair certain immune cell functions, which is statistically associated with an increased risk of developing systemic lupus erythematosus (SLE). Please discuss this finding with your healthcare provider, as genetic risk is only one component of overall health and disease development.
This genotype is found at varying frequencies across different ancestries, being more common in some populations than others.
Elevated susceptibility risk
This genotype includes two copies of the risk-associated allele, known as the R77H variant. Research has identified this variant as one of the stronger genetic susceptibility factors for systemic lupus erythematosus (SLE) due to its role in impairing complement receptor 3-mediated functions in immune cells. Having this genotype does not mean you will develop SLE, but it is associated with a higher statistical risk compared to those without the variant.
This genotype is less common than the A/A or A/G genotypes and its prevalence varies significantly by ancestral background.
What is the rs1143679 Variant?
The rs1143679 variant is a single nucleotide polymorphism (SNP) that results in an amino acid change, often referred to as R77H, within the protein encoded by the ITGAM gene. This gene provides instructions for making a protein called CD11b, which is a crucial component of complement receptor 3 (CR3). This receptor is found on the surface of various white blood cells, including monocytes and macrophages, where it plays a vital role in the immune system's ability to recognize and clear pathogens or cellular debris. Because this variant alters the structure of the CD11b protein, it has been the subject of extensive study to determine how it might impair normal immune cell function. The variant is also associated with a genomic region identified as LOC126862331, which functions as an enhancer element, suggesting that the impact of this genetic site may be complex and involve both protein-coding changes and regulatory effects on gene expression.
Associations with Health and Disease
The most prominent association identified in scientific literature for rs1143679 is with systemic lupus erythematosus (SLE), a chronic autoimmune disease where the immune system attacks healthy tissues. Multiple genome-wide association studies (GWAS) have highlighted this SNP as a significant genetic risk factor for developing SLE. Beyond autoimmune susceptibility, the variant has also been linked to variations in the levels of free cholesterol found in small high-density lipoprotein (HDL) particles. While the exact mechanism connecting this variant to cholesterol metabolism is still being investigated, the evidence suggests that the ITGAM gene's role in immune regulation may intersect with metabolic pathways. It is important to note that while these statistical associations are well-documented in research, having this variant does not mean an individual will develop lupus or experience specific cholesterol-related health issues. These traits are multifactorial, meaning they are influenced by a combination of genetics, environment, and lifestyle factors.
Understanding the Evidence
The evidence linking rs1143679 to SLE is considered moderate to strong within the context of genetic research. Studies have shown that the R77H variant can impair the effector functions of complement receptor 3, potentially hindering the body's ability to clear immune complexes, which is a hallmark of lupus pathology. However, the strength of this association can vary significantly between different ancestral populations. For instance, research conducted in various cohorts, including Egyptian and other diverse populations, has sought to replicate these findings, often confirming the variant's role as a potential risk factor. Because the evidence is based on population-level statistics, it is not a diagnostic tool for individuals. Genetic associations are probabilistic, not deterministic. Researchers continue to study how this variant interacts with other genes and environmental triggers to better understand the full spectrum of its impact on human health.
What You Can and Cannot Do with This Information
Information about genetic variants like rs1143679 is primarily intended for educational and research purposes. You cannot use this information to diagnose yourself with systemic lupus erythematosus or any other condition. If you have concerns about your health, symptoms of autoimmune disease, or questions about your cholesterol levels, it is essential to consult with a qualified healthcare professional. They can provide appropriate clinical testing, interpret your results in the context of your personal and family medical history, and guide you toward evidence-based care. Do not make any changes to your health regimen or medications based on genetic data without first discussing them with your doctor or pharmacist. Genetic science is rapidly evolving, and while variants like rs1143679 provide valuable insights into the biological mechanisms of disease, they represent only one piece of a much larger and more complex health puzzle.
How common is this variant?
The frequency of the rs1143679 variant is variable across different global populations, with specific allele distributions often differing significantly between ancestral groups.
Frequently asked questions
Is rs1143679 a diagnostic test for lupus?
No, rs1143679 is not a diagnostic test for systemic lupus erythematosus. While it is associated with an increased risk, many people with the variant never develop the disease, and many people with lupus do not carry this specific variant.
What does the R77H notation mean?
R77H is a protein-level description of the variant. It indicates that at position 77 of the CD11b protein, the amino acid arginine (R) has been replaced by histidine (H).
Can I change my risk associated with this variant?
Genetic variants are inherited and cannot be changed. However, managing your overall health through regular medical check-ups, a healthy lifestyle, and working with your doctor can help you manage your general health risks.
Where can I find more information on this SNP?
You can find more information through reputable scientific databases such as the GWAS Catalog, NCBI's dbSNP, and PubMed. These resources provide access to peer-reviewed research and population data.
Sources & further reading
Educational information only, last refreshed 9/15/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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