HBB rs75527376: Understanding Beta-Thalassemia Associations
The rs75527376 variant is a specific genetic marker located within the HBB gene, which provides instructions for making the beta-globin protein. This variant is primarily studied for its potential association with beta-thalassemia carrier status in specific Mediterranean and Middle Eastern populations.
What each genotype means
Typical beta-globin profile
This genotype represents the most common sequence found in the HBB gene. It is not associated with the specific beta-thalassemia carrier status linked to this variant.
This is the most common genotype observed across all global populations.
Potential beta-thalassemia carrier
Carrying one copy of this variant may be associated with beta-thalassemia carrier status, particularly in individuals of Mediterranean or Middle Eastern descent. Because evidence for this specific variant is limited, you should discuss these results with a genetic counselor or clinician to understand if further testing is appropriate for your health context.
This genotype is more frequently observed in Mediterranean and Middle Eastern populations compared to other global groups.
Increased beta-thalassemia risk
Carrying two copies of this variant may be linked to beta-thalassemia carrier status or related hemoglobin traits. As the clinical evidence for this specific variant is limited, this finding should be reviewed by a medical professional to determine its relevance to your health and family history.
This genotype is rare and primarily identified in specific Mediterranean and Middle Eastern populations.
What is rs75527376 and Where is it Located?
The rs75527376 variant is a single nucleotide polymorphism (SNP) situated within the HBB gene on chromosome 11. The HBB gene is responsible for encoding the beta-globin subunit, a critical component of hemoglobin, the protein in red blood cells that carries oxygen throughout the body. While the human genome contains millions of SNPs, those located within the HBB gene are of particular interest to researchers because even minor changes in this sequence can alter the structure or production levels of hemoglobin. Because this variant is often excluded from standard, broad-spectrum genetic screening panels, it is frequently overlooked in general clinical testing. Understanding its location helps scientists determine if the variant sits in a functional region of the gene that might influence how beta-globin is synthesized or processed.
The Role of the HBB Gene
The HBB gene is essential for human health, as it produces the beta-globin chains that combine with alpha-globin chains to form hemoglobin A, the primary type of hemoglobin in adults. Mutations in this gene are well-documented and are the underlying cause of several hemoglobinopathies, including sickle cell disease and various forms of beta-thalassemia. Beta-thalassemia occurs when the body produces insufficient amounts of beta-globin, leading to a reduction in healthy red blood cells and potential anemia. Because the HBB gene is highly sensitive to sequence changes, researchers categorize variants based on whether they cause a total loss of protein production (beta-zero thalassemia) or a partial reduction (beta-plus thalassemia). Variants like rs75527376 are investigated to see if they contribute to these clinical presentations or if they act as benign markers in the population.
Research Associations and Evidence Strength
Current scientific evidence regarding rs75527376 is considered limited. While some studies have flagged this variant in the context of beta-thalassemia carrier status, it does not carry the same level of clinical classification as well-known pathogenic mutations like IVS I-110G>A. In genetic research, 'limited evidence' means that while there is a statistical signal or an observed correlation in specific cohorts, there is not yet enough functional data or large-scale clinical validation to definitively label the variant as a primary cause of disease. It is important to distinguish between a variant that causes a condition and one that is simply found alongside other, more impactful mutations. Because the evidence is currently mixed or ancestry-specific, researchers continue to study this marker to clarify its role in hemoglobin production and its potential impact on hematological health.
Population Frequency and Distribution
The distribution of HBB variants is often highly localized due to historical evolutionary pressures, such as the protective effect some hemoglobin traits provide against malaria. The rs75527376 variant is most commonly observed in Mediterranean and Middle Eastern populations. Genetic diversity in these regions is significant, and the frequency of specific HBB variants can vary greatly even between neighboring countries or ethnic groups. Because this variant is not globally common, it is rarely captured in large, diverse population databases, which can make it difficult to establish a precise frequency. Researchers rely on regional studies to understand how common this variant is within specific ancestral groups, noting that its presence is a reflection of the unique genetic landscape of these populations.
What You Can and Cannot Do With This Information
Genetic information regarding variants like rs75527376 should be interpreted with caution. If you have received a report mentioning this variant, it is essential to understand that it does not constitute a medical diagnosis. Genetic testing results are complex and should always be reviewed by a qualified healthcare provider or a genetic counselor who can place the finding in the context of your personal and family medical history. You cannot use this information to self-diagnose or predict specific health outcomes. If you are concerned about thalassemia or other blood-related conditions, consult your clinician to discuss appropriate diagnostic blood work, such as a complete blood count (CBC) or hemoglobin electrophoresis. Never make changes to your health management or medication based on a single SNP result without professional medical guidance.
How common is this variant?
The rs75527376 variant is noted to be more common in Mediterranean and Middle Eastern populations, though specific global frequency data remains limited in large-scale databases.
Frequently asked questions
Is rs75527376 a cause of beta-thalassemia?
The evidence for rs75527376 as a direct cause of beta-thalassemia is currently limited. It is often studied as a marker in specific populations, but it is not classified with the same certainty as known pathogenic HBB mutations.
Should I be worried if I have this variant?
Finding a variant in your genetic report does not mean you have a disease. You should discuss the result with your doctor, who can determine if further clinical testing, such as a blood count or hemoglobin analysis, is necessary.
Why is this variant not on standard genetic panels?
Many commercial genetic panels focus on the most common or well-established pathogenic mutations. Variants like rs75527376 may be excluded if they are rare or if their clinical significance is not yet fully established by medical guidelines.
Can I use this information to change my diet or supplements?
No. Genetic variants in the HBB gene relate to the structure of hemoglobin, not nutritional deficiencies. You should never alter your diet or take supplements based on a genetic variant without consulting a healthcare professional.
Sources & further reading
Educational information only, last refreshed 10/6/2026. Not medical advice — these associations describe population statistics, not individual predictions.
Curious what your genotype is for rs75527376?
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 HBB
This variant is associated with hemoglobin-related traits and is frequently referenced in clinical databases.
This variant is a known pathogenic mutation in the HBB gene linked to beta-thalassemia.
This variant is a pathogenic mutation in the HBB gene associated with hemoglobinopathies such as sickle cell disease.
This variant is linked to sickle cell trait and related hemoglobin disorders, requiring clinical validation for carrier status.
This variant is associated with hemoglobinopathies and is a well-established clinical marker often absent from basic consumer panels.
This variant is a rare mutation associated with hemoglobinopathies and altered oxygen transport.