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Netherton syndrome
This rare genetic disorder is characterised by inflamed, scaly skin, distinctive hair abnormalities, and often a tendency towards allergies. It typically presents at birth or in early infancy and can have a significant impact on affected individuals.
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Overview
Netherton syndrome is a rare genetic disorder that primarily affects the skin, hair, and immune system. Individuals with this condition typically experience chronic skin inflammation, which often presents as widespread redness and scaling. The hair tends to be fragile and can break easily, a characteristic feature. Many individuals also have an increased susceptibility to allergic conditions such as asthma, eczema, and food allergies [PMID:32060856]. The condition is present from birth or develops shortly thereafter, and its severity can vary among affected individuals.
Symptoms & clinical features
The symptoms of Netherton syndrome are typically visible at or shortly after birth. The skin manifestations often include erythrodermic ichthyosis, where the skin appears red and inflamed with fine scales, sometimes resembling a 'collodion baby' appearance at birth. This inflammation can be widespread and persistent. Another hallmark is a distinctive hair shaft defect called trichorrhexis invaginata, sometimes referred to as 'bamboo hair' due to its appearance under a microscope. This makes the hair very brittle and prone to breakage, leading to sparse hair on the scalp, eyebrows, and eyelashes [PMID:32060856]. Beyond the skin and hair, individuals with Netherton syndrome often have a heightened risk of developing allergic conditions. These can include atopic dermatitis (eczema), asthma, and various food allergies. Some individuals may also experience recurrent infections, growth delays, and immune system dysregulation [PMID:24075200]. The combination of skin barrier dysfunction and immune abnormalities contributes to the complex presentation of the syndrome.
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Affected organs
Netherton syndrome primarily affects the skin, which shows chronic inflammation, redness, and scaling. The hair, including scalp hair, eyebrows, and eyelashes, is also significantly impacted, becoming brittle and sparse. The immune system is often involved, leading to an increased predisposition to allergic diseases. In some cases, the gastrointestinal system may be affected, potentially contributing to poor growth due to malabsorption of nutrients.
Risks & severity
The severity of Netherton syndrome can range, but it is generally considered a serious condition that requires ongoing management. In infancy, there can be a risk of dehydration, infection, and failure to thrive due to extensive skin involvement and impaired skin barrier function. Lifetime risks include chronic skin inflammation, which can lead to discomfort and itchiness, and an increased susceptibility to infections. The hair abnormalities are persistent. Individuals also face a higher risk of developing severe allergic reactions and autoimmune conditions [PMID:32060856]. The condition is present from birth, and its long-term impact varies, necessitating individualised care.
Genetic causes
Netherton syndrome is caused by pathogenic variants in the *SPINK5* gene. This gene provides instructions for making a protein called LEKTI (lympho-epithelial Kazal-type related inhibitor). LEKTI plays a crucial role in regulating the activity of certain enzymes, known as serine proteases, which are involved in skin barrier formation and immune responses [PMID:24075200]. When the *SPINK5* gene has pathogenic variants, the LEKTI protein is either absent or non-functional. Without properly functioning LEKTI, there is uncontrolled activity of serine proteases in the outermost layer of the skin (the stratum corneum). This leads to abnormal shedding of skin cells, a compromised skin barrier, and chronic inflammation characteristic of Netherton syndrome [PMID:32060856].
- SPINK5 serine peptidase inhibitor Kazal type 5
Inheritance pattern
Netherton syndrome is inherited in an autosomal recessive pattern. This means that a person must inherit two altered copies of the *SPINK5* gene - one from each parent - to develop the condition. If a person inherits only one altered copy and one normal copy, they are considered a carrier. Carriers typically do not show symptoms of Netherton syndrome but can pass the altered gene copy to their children. If two carriers have children together, there is a 25% chance with each pregnancy that their child will inherit two altered gene copies and develop the syndrome.
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
A diagnosis of Netherton syndrome is often suspected based on the characteristic clinical features, including the unique skin inflammation and hair abnormalities. Microscopic examination of hair shafts, which may reveal the 'bamboo hair' (trichorrhexis invaginata) defect, can provide strong supporting evidence. Genetic testing is used to confirm the diagnosis by identifying pathogenic variants in the *SPINK5* gene [PMID:24075200]. In the UK, genetic testing for Netherton syndrome can be accessed through the NHS Genomic Medicine Service (GMS). Patients are typically referred to clinical genetics services by their GP or a specialist, such as a dermatologist or paediatrician, for assessment and consideration for genomic testing. This testing falls under specific NHS R-codes.
Management & lifestyle
Management for Netherton syndrome focuses on alleviating symptoms and preventing complications, as there is currently no cure. Skincare is a cornerstone of management, involving emollients and topical treatments to address dryness and inflammation. Careful attention to skin infections is crucial. Immunosuppressants may be considered in severe cases, but their use requires careful monitoring. Nutritional support is often necessary, especially in infants, to ensure adequate growth [PMID:24075200]. Individuals with Netherton syndrome typically receive multidisciplinary care involving dermatologists, paediatricians, allergists, and dietitians. Genetic counsellors can provide essential information about inheritance and family planning. Regular monitoring for potential complications, such as infections and growth issues, is an important part of ongoing care.
UK care pathway
In the UK, individuals suspected of having Netherton syndrome can be referred through their GP or a specialist to an NHS Clinical Genetics service. Clinical geneticists and genetic counsellors are key in guiding the diagnostic journey, including access to genomic testing via the NHS Genomic Medicine Service. The specific genomic test for Netherton syndrome is covered by relevant NHS R-codes, ensuring a standardised approach to diagnosis and care. Genetic counselling is an integral part of this pathway, offering support and information to patients and their families.
Frequently asked questions
Is Netherton syndrome contagious?
No, Netherton syndrome is a genetic condition caused by changes in a person's genes. It cannot be caught from another person and is not infectious.
What kind of doctors treat Netherton syndrome?
Care for Netherton syndrome typically involves a team of specialists, including dermatologists for skin care, paediatricians (for children), allergists for immune issues, and genetic specialists. Other specialists, such as dietitians, may also be involved.
Can Netherton syndrome be cured?
Currently, there is no cure for Netherton syndrome. Treatment focuses on managing the symptoms, improving skin health, and addressing associated complications like allergies and growth issues.
How does Netherton syndrome affect daily life?
Netherton syndrome can significantly impact daily life due to chronic skin issues, fragile hair, and a tendency towards allergies. Managing the condition often requires regular medical care and specific skincare routines, which can affect social activities and schooling or work.
What are the chances of my other children having Netherton syndrome?
If you and your partner are both carriers of a pathogenic *SPINK5* variant, there is a 25% (1 in 4) chance with each pregnancy that your child will inherit Netherton syndrome. Genetic counselling can provide personalised risk assessments and discuss family planning options.
References
- Olbrich H, Sadik CD, Ludwig RJ. Dupilumab in Inflammatory Skin Diseases: A Systematic Review. Biomolecules. 2023. PMID: 37189381
- Muñoz-Bellido FJ, Moreno E, Dávila I. Dupilumab: A Review of Present Indications and Off-Label Uses. Journal of investigational allergology & clinical immunology. 2022. PMID: 33661102
- Paller AS, Teng J, Mazereeuw-Hautier J. Syndromic epidermal differentiation disorders: a new classification toward pathogenesis-based therapy. The British journal of dermatology. 2025. PMID: 40184496
- Ahmad F, Alam MA, Ansari AW. Emerging Role of the IL-36/IL-36R Axis in Multiple Inflammatory Skin Diseases. The Journal of investigative dermatology. 2024. PMID: 38189700
- Chavarria-Smith J, Chiu CPC, Jackman JK. Dual antibody inhibition of KLK5 and KLK7 for Netherton syndrome and atopic dermatitis. Science translational medicine. 2022. PMID: 36516271
- Drivenes JL, Bygum A. Netherton Syndrome. JAMA dermatology. 2022. PMID: 36169939
- Hon KLE, Cheung YC, Chan ZM. Netherton Syndrome Perspectives. Current pediatric reviews. 2025. PMID: 40551686
- Fraitag S, Bodemer C. Neonatal erythroderma. Current opinion in pediatrics. 2010. PMID: 20616730