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Factor XI deficiency
This rare condition affects the body's ability to form blood clots, leading to prolonged or excessive bleeding, particularly after injury, surgery, or childbirth. It is caused by genetic changes and can affect individuals from any background, though it is more common in some populations.
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Overview
Factor XI deficiency, also known as Rosenthal syndrome, is an inherited condition that impacts the blood's ability to clot effectively. Blood clotting is a complex process involving many proteins, known as clotting factors. When one of these factors, Factor XI, is missing or not working correctly, the clotting process can be disrupted [PMID:11520282]. This can lead to longer than expected bleeding episodes, especially after trauma or medical procedures. The severity of bleeding symptoms can vary significantly among individuals, even within the same family.
Symptoms & clinical features
Individuals with Factor XI deficiency may experience a range of bleeding symptoms. These often become apparent after events that challenge the clotting system, such as surgery (including dental procedures), injuries, or childbirth [PMID:24075216]. Common symptoms include prolonged nosebleeds, easy bruising, and heavy or extended menstrual periods (menorrhagia) in women. Some individuals may have no symptoms at all and only discover the condition if they undergo a procedure that provokes bleeding or through family screening. Bleeding into joints or muscles, which can occur in more severe bleeding disorders, is less common in Factor XI deficiency.
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Affected organs
While Factor XI deficiency primarily affects the blood and its clotting abilities, the consequences of impaired clotting can manifest in various parts of the body. Organs such as the nose, gums, and uterus (leading to heavy menstrual bleeding) are commonly involved due to their delicate blood vessel networks or physiological processes that can trigger bleeding. Any site of injury or surgical intervention can be affected by prolonged bleeding. Internal bleeding, though less common than external bleeding, can potentially impact organs like the brain or gastrointestinal tract, especially in severe cases or following significant trauma.
Risks & severity
The severity of Factor XI deficiency can vary; some individuals have no noticeable bleeding problems, while others experience significant issues. The risk of bleeding does not always correlate directly with the amount of Factor XI protein in the blood [PMID:24075216]. Bleeding tends to be most prominent following surgery, dental extractions, or trauma, rather than spontaneous bleeding. For women, heavy menstrual bleeding and bleeding complications during or after childbirth are particular considerations. The exact prevalence of Factor XI deficiency in the general population is not well established, but it is estimated to affect approximately 1 in 1,000,000 people globally. However, it is found to be more common in individuals of Ashkenazi Jewish descent, where the prevalence can be as high as 4% [PMID:20301720].
Genetic causes
Factor XI deficiency is caused by changes in the F11 gene. This gene provides instructions for making Factor XI, a crucial protein involved in the blood coagulation cascade. The coagulation cascade is a series of complex steps that leads to the formation of a blood clot, which is vital for stopping bleeding. When the F11 gene contains a pathogenic variant, it can lead to a reduced amount of functional Factor XI protein or a completely absent protein. This disruption means that the complex chain of events required for effective blood clotting cannot proceed normally, resulting in a tendency to bleed excessively or for longer than expected.
- F11 coagulation factor XIThe F11 gene provides instructions for making coagulation factor XI, a protein essential for the blood clotting process, playing a vital role in preventing excessive bleeding.
Inheritance pattern
Factor XI deficiency is inherited in an autosomal recessive pattern. This means that a person must inherit two copies of the altered F11 gene - one from each parent - to typically develop the condition. Individuals who inherit only one copy of the altered gene are usually carriers. Carriers may have slightly reduced levels of Factor XI but often do not experience significant bleeding symptoms. They can, however, pass the altered gene on to their children. If two carriers have children, there is a 25% chance with each pregnancy that their child will inherit two altered gene copies and develop Factor XI deficiency. There is also a 50% chance the child will be a carrier, and a 25% chance the child will not inherit the altered gene at all.
When both parents are carriers, each child has a 25% chance of being affected, 50% of being a carrier, and 25% of being unaffected.
Diagnosis & testing
Diagnosis of Factor XI deficiency typically begins with a review of an individual's personal and family bleeding history. If a bleeding disorder is suspected, blood tests are performed to measure the time it takes for blood to clot and to assess the levels of various clotting factors. A test called activated partial thromboplastin time (APTT) may be prolonged in individuals with Factor XI deficiency. Confirmatory diagnosis is made by measuring the activity level of Factor XI [PMID:11520282]. Genetic testing of the F11 gene can then confirm the diagnosis and identify the specific genetic changes, which can be important for family planning and risk assessment. Referrals for genetic testing in the UK often occur via a clinical genetics service, which can be accessed through an NHS Genomic Medicine Service (GMS) pathway, typically using an appropriate R-code.
Management & lifestyle
Management for Factor XI deficiency focuses on preventing and treating bleeding episodes. For individuals without active bleeding, management might involve careful planning before any surgical or dental procedures to minimise bleeding risks. For bleeding episodes, treatment options may include transfusions of fresh frozen plasma, which contains Factor XI, or the use of Factor XI concentrate if available. Anti-fibrinolytic medications, such as tranexamic acid, can also be used to help stabilise clots and reduce bleeding, particularly during menstrual periods or after mucosal bleeding. All management decisions should be made in consultation with a haematologist or other specialist experienced in treating bleeding disorders. Individuals in the UK can access specialist care through their local NHS trusts and through referral to regional haemophilia comprehensive care centres.
UK care pathway
In the UK, individuals suspected of having an inherited bleeding disorder like Factor XI deficiency would typically be referred to a haematology specialist. If diagnostic genetic testing is warranted, this would align with the NHS Genomic Medicine Service (GMS) pathway. Clinical genetics services will often oversee the genetic testing process, utilising specific R-codes for bleeding disorders. Genetic counsellors play a vital role in providing information and support to individuals and families regarding inheritance patterns, genetic testing results, and implications for relatives.
Frequently asked questions
Will I always bleed a lot if I have Factor XI deficiency?
Not necessarily. The amount of Factor XI in your blood doesn't always predict how much you will bleed. Many people have mild symptoms or only experience bleeding after surgery or an injury, not spontaneously.
Can Factor XI deficiency affect women differently than men?
Yes, women with Factor XI deficiency may experience heavy or prolonged menstrual bleeding (menorrhagia) and can have an increased risk of bleeding complications during childbirth or after gynaecological procedures. These specific challenges are less relevant for men.
What should I do if I need surgery or a dental procedure?
It is very important to inform your healthcare team, including your surgeon or dentist, that you have Factor XI deficiency. They can then plan appropriate measures to minimise bleeding risks and manage any bleeding that occurs during or after the procedure.
Is there a cure for Factor XI deficiency?
Currently, there is no cure for Factor XI deficiency. Management focuses on preventing and treating bleeding episodes. Treatments include medication to help clots form or infusions of clotting factors if needed.
Are my family members at risk of having Factor XI deficiency?
Because Factor XI deficiency is an inherited condition, your close relatives, such as parents, siblings, and children, may also be carriers or affected. Genetic counselling can help assess their risks and discuss options for testing.
References
- Lewandowska MD, Connors JM. Factor XI Deficiency. Hematology/oncology clinics of North America. 2021. PMID: 34535287
- O'connell NM. Factor XI deficiency. Seminars in hematology. 2004. PMID: 14872426
- Bolton-Maggs PH. Factor XI deficiency. Bailliere's clinical haematology. 1996. PMID: 8800510
- Gomez K, Bolton-Maggs P. Factor XI deficiency. Haemophilia : the official journal of the World Federation of Hemophilia. 2008. PMID: 18312365
- Duga S, Salomon O. Factor XI Deficiency. Seminars in thrombosis and hemostasis. 2009. PMID: 19598070
- De Caterina R, Prisco D, Eikelboom JW. Factor XI inhibitors: cardiovascular perspectives. European heart journal. 2023. PMID: 36263776
- Dhaha Y, El Borgi W, Elmahmoudi H. Factor XI deficiency: About 20 cases and literature review. La Tunisie medicale. 2022. PMID: 35822334
- Seligsohn U. Factor XI deficiency in humans. Journal of thrombosis and haemostasis : JTH. 2009. PMID: 19630775