F11 rs281875251: Understanding Factor XI Deficiency Carrier Status
The rs281875251 variant is a genetic change located in the F11 gene, which provides instructions for producing coagulation factor XI. This variant is associated with carrier status for Factor XI deficiency, a condition that can affect the body's ability to form blood clots properly.
What each genotype means
Typical factor XI levels
This genotype represents the common, non-variant form of the F11 gene at this position. Individuals with this profile are not expected to have the specific Factor XI deficiency associated with this variant.
This is the most common genotype found in the general population.
Factor XI deficiency carrier
You carry one copy of the variant associated with Factor XI deficiency, also known as hemophilia C. While carriers typically do not exhibit severe bleeding symptoms, they may have reduced levels of Factor XI protein in their blood compared to non-carriers. You should inform your healthcare provider of this status, especially before undergoing surgery or dental procedures.
This genotype is rare in the general population.
Factor XI deficiency
This genotype is associated with Factor XI deficiency, a condition that can impair the blood's ability to clot properly. Individuals with this profile may experience increased bleeding, particularly after trauma, surgery, or dental work. It is important to discuss this result with a medical professional or genetic counselor to understand your specific health risks and management options.
This genotype is very rare in the general population.
What is the rs281875251 Variant?
The rs281875251 variant is a specific change in the DNA sequence of the F11 gene, located on chromosome 4. In genetic terms, this variant is often identified by its position and the specific nucleotide change involved. It is sometimes referred to in clinical literature as c.1789G>T, which results in a protein change known as p.Glu597Ter. This type of change is a nonsense mutation, meaning it introduces a premature stop signal in the genetic code, potentially leading to the production of a shortened or non-functional protein. Because this variant can disrupt the normal function of the F11 gene, it is studied for its role in hereditary bleeding disorders. Understanding where this variant sits in the genome helps researchers and clinicians identify how it might influence the production of essential proteins involved in the complex process of blood coagulation.
The Role of the F11 Gene
The F11 gene is responsible for creating coagulation factor XI, a protein that plays a critical role in the blood coagulation cascade. This cascade is a series of chemical reactions that occur after an injury to form a stable blood clot, which is necessary to stop bleeding and allow for tissue repair. Factor XI is primarily produced in the liver and circulates in the bloodstream in an inactive form. When a blood vessel is damaged, the coagulation cascade is triggered, and factor XI is activated to help convert prothrombin into thrombin. Thrombin then facilitates the creation of fibrin, the structural material that forms the mesh of a blood clot. When the F11 gene contains a pathogenic variant, the body may produce insufficient or dysfunctional factor XI, which can lead to a condition known as Factor XI deficiency, also historically referred to as hemophilia C or Rosenthal disease.
Research and Clinical Associations
Research has established a clear link between certain variants in the F11 gene and Factor XI deficiency. The rs281875251 variant is recognized in clinical databases, such as ClinVar, as having pathogenic potential. Individuals who carry this variant may have a reduced ability to produce functional factor XI. While Factor XI deficiency is generally considered a mild bleeding disorder, it can lead to increased bleeding during or after surgical procedures, dental work, or significant trauma. It is important to note that the severity of bleeding symptoms does not always correlate perfectly with the measured levels of factor XI activity in the blood. Because this is a recessive condition, individuals who are carriers (having one copy of the variant) typically do not exhibit severe symptoms, but they may pass the variant to their offspring. Clinical evidence for this specific variant is considered moderate, and its impact is best understood in the context of a comprehensive medical evaluation.
Population Frequency and Distribution
The rs281875251 variant is classified as rare in the general population. Genetic variants that cause rare bleeding disorders often show significant variation in frequency across different ancestral groups. Because this variant is not common, it is not typically found in large numbers in standard population databases. The rarity of the variant means that the likelihood of an individual carrying it is low, but it remains a significant focus for clinical genetic testing, particularly for families with a history of unexplained bleeding or those undergoing pre-conception screening. Because population frequencies can be highly specific to certain geographic or ethnic groups, researchers continue to study how this variant is distributed globally to better understand its prevalence and the potential risk it poses to different populations.
Managing Your Genetic Information
If you have received information regarding your status for the rs281875251 variant, it is essential to approach this data with the guidance of a qualified healthcare professional. Genetic information can be complex, and the presence of a variant does not automatically mean you will experience clinical symptoms. You cannot diagnose yourself or determine your risk for bleeding disorders based solely on a genetic report. If you are concerned about your carrier status or potential bleeding risks, consult with a genetic counselor or a hematologist. They can help interpret your results in the context of your personal and family medical history. Furthermore, if you are taking any medications that affect blood clotting, always discuss your genetic findings with your clinician or pharmacist before making any changes to your treatment plan. This information is intended for educational purposes and should not replace professional medical advice, diagnosis, or treatment.
How common is this variant?
The rs281875251 variant is considered rare in the general population, with specific frequency data varying significantly by ancestry.
Frequently asked questions
What is Factor XI deficiency?
Factor XI deficiency is a rare, usually mild, inherited bleeding disorder. It occurs when the body does not produce enough functional factor XI protein, which is necessary for normal blood clotting.
Does being a carrier mean I have a bleeding disorder?
Being a carrier typically means you have one copy of the variant and one normal copy of the gene. Most carriers do not experience significant bleeding symptoms, but you should discuss your status with a doctor.
How is Factor XI deficiency diagnosed?
Diagnosis is typically made through blood tests that measure the activity level of factor XI in the plasma. Genetic testing can also identify specific variants in the F11 gene.
Can I change my genotype?
No, your genotype is determined at conception and cannot be changed. Genetic information is a permanent part of your biological makeup.
Should I be worried if I have this variant?
Having a genetic variant is not a medical diagnosis. You should consult with a healthcare professional or a genetic counselor to understand what this result means for your specific health situation.
Sources & further reading
Educational information only, last refreshed 9/19/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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This deletion variant is associated with hereditary factor XI deficiency, which can lead to increased bleeding risk.
This variant is linked to carrier status for hereditary factor XI deficiency.
This variant in the F11 gene is associated with hereditary factor XI deficiency, a condition that can lead to bleeding disorders.
This SNP is linked to hereditary factor XI deficiency, where carriers may have reduced levels of factor XI protein.
This variant is associated with hereditary factor XI deficiency, with homozygous carriers showing increased clinical risk.
This variant is associated with hereditary factor XI deficiency, a condition that can lead to bleeding disorders.