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Hyper-IgE syndrome (AD, STAT3)
This syndrome is an inherited disorder that weakens the immune system, making individuals prone to recurrent infections, especially skin and lung infections. It can also cause severe eczema and certain bone and dental features.
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Overview
Hyper-IgE syndrome (AD, STAT3) is a rare condition that primarily affects the immune system, leading to its alternative name, Job's syndrome. It is characterised by a combination of elevated immunoglobulin E (IgE) levels in the blood, recurrent infections, and distinctive skeletal and dental features. The condition is inherited in an autosomal dominant pattern, meaning a single altered copy of the causative gene is sufficient to cause the syndrome [PMID:24075112].
Individuals with Hyper-IgE syndrome often experience frequent bacterial and fungal infections, particularly affecting the skin and lungs. These infections can be severe and may require ongoing medical attention. Beyond the immune system, the condition can also impact other parts of the body, including bones, teeth, and connective tissues, contributing to a broad range of symptoms.
Symptoms & clinical features
Key symptoms of Hyper-IgE syndrome (AD, STAT3) typically emerge in infancy or early childhood. Recurrent skin abscesses, often referred to as 'cold abscesses' because they may not show typical signs of inflammation like warmth or redness, are a common feature [PMID:24075112]. Severe eczema, a chronic itchy skin rash, is also frequently observed. These skin issues often lead to recurring bacterial infections.
Lung infections, such as pneumonia, are another hallmark of the syndrome. These can result in lung damage over time, including the formation of air-filled cysts called pneumatocoeles. Dental abnormalities, such as retention of primary (baby) teeth, and skeletal issues like scoliosis (curvature of the spine) or bone fragility may also be present. Facial features can sometimes include a prominent forehead and deep-set eyes.
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Affected organs
The immune system is centrally affected in Hyper-IgE syndrome, specifically the ability of certain immune cells to respond effectively to pathogens. This leads to the characteristic susceptibility to bacterial and fungal infections, especially in the lungs and on the skin. The skin is also profoundly affected, with severe eczema and recurrent abscesses being prominent.
Skeletal and connective tissues are also impacted, which can result in features such as osteopenia (reduced bone density), scoliosis, and recurrent fractures. Dental issues, including delayed shedding of primary teeth and palate abnormalities, are frequently observed. The respiratory system, particularly the lungs, can suffer chronic damage from repeated infections, potentially leading to bronchiectasis or pneumatocoeles.
Risks & severity
The severity of Hyper-IgE syndrome (AD, STAT3) can vary among affected individuals, even within the same family. However, it generally presents as a lifelong condition requiring ongoing medical management. The primary risks stem from the compromised immune system, leading to recurrent and potentially life-threatening infections, especially of the lungs. Chronic lung damage can develop over time due to repeated infections.
Skeletal issues, including fragile bones, can lead to pain and mobility problems. The risk of developing certain autoimmune conditions or malignancies may also be increased, although this is less common. Lifespan can be affected by the severity and management of recurrent infections and their complications. Early diagnosis and consistent medical care are important for improving outcomes and managing complications.
Genetic causes
Hyper-IgE syndrome (AD, STAT3) is caused by pathogenic variants in the STAT3 gene. The STAT3 gene provides instructions for making a protein called Signal Transducer and Activator of Transcription 3. This protein plays a crucial role in cell signalling, acting as a transcription factor, which means it helps control the activity of other genes [PMID:28929011].
Specifically, the STAT3 protein is vital for the development and function of immune cells, including T helper 17 (Th17) cells, which are important for fighting off certain bacterial and fungal infections. When the STAT3 gene has a pathogenic variant, the resulting protein may not function correctly, disrupting these important immune pathways. This impaired function leads to the characteristic immune deficiencies, high IgE levels, and other features observed in individuals with the syndrome [PMID:24075112].
- STAT3 signal transducer and activator of transcription 3The STAT3 gene provides instructions for a protein crucial in cellular signalling pathways, influencing cell growth, division, and immune system function.
Inheritance pattern
Hyper-IgE syndrome caused by STAT3 variants follows an autosomal dominant inheritance pattern. This means that a person only needs one altered copy of the STAT3 gene to develop the condition. Each child of an affected parent has a 50% chance of inheriting the altered gene and therefore developing the syndrome.
In some cases, the pathogenic variant can arise spontaneously in an individual with no family history of the condition. This is known as a de novo variant. Once such a variant occurs, it can then be passed on to future generations in an autosomal dominant manner. Genetic counselling is often recommended for families affected by Hyper-IgE syndrome to understand the inheritance patterns and risks.
Each child has a 50% chance of inheriting the pathogenic variant, regardless of sex.
Diagnosis & testing
Diagnosis of Hyper-IgE syndrome (AD, STAT3) is typically suspected based on characteristic clinical features, such as recurrent severe infections (especially skin and lung), severe eczema, and extremely high levels of IgE in the blood. Confirmation of the diagnosis is achieved through genetic testing that identifies a pathogenic variant in the STAT3 gene.
In the UK, genetic testing for suspected inherited immune deficiencies is often requested by clinical immunologists or geneticists. Referral for genetic testing can be made through NHS Genomic Medicine Service pathways, which utilise specific R-codes for panels covering immune disorders. A clinical genetics service can provide further information and coordinate appropriate testing.
Management & lifestyle
Management for Hyper-IgE syndrome (AD, STAT3) focuses on preventing and treating infections, managing eczema, and addressing other associated symptoms. This often involves long-term antibiotic and antifungal medications to prevent recurrent infections. Prompt and aggressive treatment of active infections is crucial.
Regular monitoring by an immunology specialist is typically recommended. Surveillance may include assessing lung function and bone health. Physiotherapy can be beneficial for skeletal issues like scoliosis. Individuals with Hyper-IgE syndrome generally receive care within the NHS through specialist immunology and genetics services, with access to genetic counsellors to discuss the condition and its implications.
UK care pathway
In the UK, individuals suspected of having Hyper-IgE syndrome (AD, STAT3) are usually referred to specialist NHS services, such as clinical immunology or clinical genetics. These services can assess symptoms, arrange diagnostic tests, and coordinate ongoing care. Genetic testing is available through the NHS Genomic Medicine Service (GMS) pathways, often under relevant R-codes for inherited immune disorders, to confirm the genetic cause.
Clinical geneticists and genetic counsellors play a key role in supporting individuals and families, providing information about the condition, inheritance patterns, and reproductive options. They can also help coordinate care with other specialists, such as respiratory physicians or dermatologists, as needed.
Frequently asked questions
What is the typical age for Hyper-IgE syndrome to be diagnosed?
Symptoms often begin in infancy or early childhood, and diagnosis usually occurs during these early years based on a combination of characteristic clinical features and genetic testing.
Can Hyper-IgE syndrome be passed down to children?
Yes, Hyper-IgE syndrome (AD, STAT3) is inherited in an autosomal dominant pattern. If a parent has the condition, each child has a 50% chance of inheriting the altered gene and developing the syndrome.
Are there specific treatments for the high IgE levels?
While high IgE levels are a hallmark, treatment primarily focuses on managing and preventing the recurrent infections and other symptoms rather than directly lowering IgE. Long-term antibiotics and antifungals are commonly used.
What kind of infections are common in Hyper-IgE syndrome?
Individuals with Hyper-IgE syndrome commonly experience recurrent bacterial infections, particularly affecting the skin (leading to abscesses) and the lungs (causing pneumonia), as well as fungal infections.
Will people with Hyper-IgE syndrome need lifelong medical care?
Yes, Hyper-IgE syndrome is a lifelong condition that typically requires ongoing medical management by specialists, including immunologists, to prevent and treat infections and monitor for complications.