KLKB1 rs560588447: Understanding Prekallikrein Deficiency Variants
The rs560588447 variant is a specific genetic change located within the KLKB1 gene. It is recognized as a mutation associated with prekallikrein deficiency, a condition that affects the blood's intrinsic coagulation pathway.
What each genotype means
Prekallikrein deficiency carrier
You carry one copy of the T allele, also known as the c.451dupT mutation. As this condition is inherited in an autosomal recessive pattern, carriers typically do not show symptoms or health problems related to prekallikrein deficiency, though they may pass the variant to their children.
This variant is rare in the general population but is specifically monitored in carrier screening panels for individuals of Ashkenazi Jewish ancestry.
Potential prekallikrein deficiency
This genotype indicates the presence of two copies of the T allele, which is associated with congenital prekallikrein deficiency. While this condition often causes no symptoms and is typically discovered incidentally through prolonged blood clotting tests (aPTT), you should discuss these results with a healthcare provider to understand your specific coagulation profile.
This genotype is very rare, with higher observed frequencies in specific populations such as individuals of Nigerian ancestry.
What is the rs560588447 Variant?
The rs560588447 variant is a genetic alteration found on chromosome 4. In scientific literature, this specific change is often referred to as c.451dupT. This notation indicates that a single nucleotide, thymine (T), has been duplicated within the DNA sequence of the KLKB1 gene. Because this is a duplication, it can shift the reading frame of the genetic code, potentially leading to the production of a non-functional or truncated protein. This variant is categorized as a pathogenic mutation in the context of prekallikrein deficiency. It is frequently included in expanded carrier screening panels, particularly those designed for populations where this specific mutation has been identified as a recurring genetic finding.
The Role of the KLKB1 Gene
The KLKB1 gene provides the essential instructions for the body to produce a protein known as prekallikrein. This protein is synthesized primarily in the liver and circulates throughout the bloodstream in an inactive form. When the body initiates the blood clotting process, prekallikrein is converted into its active form, plasma kallikrein. Plasma kallikrein plays a critical role in the intrinsic coagulation pathway by helping to activate factor XII, which is a key step in the cascade of events that leads to blood clot formation. When mutations occur in the KLKB1 gene, they can reduce or entirely eliminate the production of functional plasma kallikrein. This disruption impairs the intrinsic coagulation pathway, which is the biological mechanism that this variant is most closely associated with.
Research and Clinical Associations
Research has established a clear link between mutations in the KLKB1 gene and prekallikrein deficiency. Individuals with this condition typically do not experience significant health problems, and the deficiency is often discovered incidentally during routine blood tests performed for other medical reasons. The evidence supporting the pathogenicity of rs560588447 is considered moderate to strong in the context of carrier screening. Studies have noted that this specific variant is not only found in Ashkenazi Jewish populations but has also been identified as common in certain African populations, such as in Nigeria. Because the condition is inherited in an autosomal recessive manner, a person must typically inherit two copies of a pathogenic variant—one from each parent—to manifest the deficiency. Carriers, who possess only one copy, generally do not display symptoms of the condition.
Population Frequency and Interpretation
The rs560588447 variant is considered rare in the general global population, though its frequency varies significantly depending on ancestral background. It is specifically monitored in carrier screening programs because of its known association with prekallikrein deficiency. It is important to understand that being a carrier for an autosomal recessive condition is common; many individuals carry at least one variant for a genetic disorder without being aware of it. If you have received results indicating you are a carrier for this variant, it is a piece of information regarding your genetic makeup rather than a medical diagnosis. This information is primarily used for reproductive planning and family health history assessment. You should discuss these results with a genetic counselor or your primary healthcare provider to understand what they mean for you and your family.
How common is this variant?
The rs560588447 variant is rare globally, though it has been documented at higher frequencies in specific populations, including individuals of Ashkenazi Jewish and Nigerian descent.
Frequently asked questions
What is prekallikrein deficiency?
Prekallikrein deficiency is a blood condition caused by mutations in the KLKB1 gene. It typically does not cause health problems and is often found incidentally during blood tests.
Does being a carrier for rs560588447 affect my health?
Generally, carriers of an autosomal recessive condition like prekallikrein deficiency do not show symptoms. The condition usually only manifests if an individual inherits two copies of the mutation.
Why is this variant included in carrier screening?
It is included in carrier screening panels to help individuals understand their risk of passing a genetic condition to their children. This information is useful for family planning.
What should I do if I am a carrier?
If you are a carrier, you should discuss the results with a genetic counselor or your doctor. They can provide context based on your family history and explain the implications for reproductive health.
Sources & further reading
Educational information only, last refreshed 9/18/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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