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Ehlers-Danlos syndrome (dermatosparaxis)
EDS-DS is a very rare genetic disorder that weakens connective tissues throughout the body, leading to extremely fragile skin, joint hypermobility, and other systemic issues. It affects individuals from birth and can have variable severity.
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Overview
Ehlers-Danlos syndrome (EDS) encompasses a group of inherited disorders that affect connective tissues, which provide support and structure to many parts of the body, including skin, joints, and blood vessels. Dermatosparaxis type (EDS-DS) is one of the rarest forms of EDS, characterised by exceptionally fragile and easily bruised skin [PMID:33673305]. This condition is present from birth and can lead to a range of health challenges affecting multiple body systems.
The term 'dermatosparaxis' literally means 'skin tearing', which reflects a primary feature of the condition. Beyond the skin, individuals with EDS-DS may experience joint issues, facial differences, and sometimes internal organ involvement. Due to its rarity, understanding of EDS-DS continues to evolve, and individuals and families often work closely with specialist medical teams.
Symptoms & clinical features
Individuals with Ehlers-Danlos syndrome, dermatosparaxis type, often present with distinctive symptoms. The most prominent feature is extremely fragile skin that tears easily, often resembling parchment paper, and bruises extensively with minimal trauma [PMID:1918735]. Wounds tend to heal slowly and can leave prominent, 'fish-mouth' scars. The skin may also feel soft, doughy, or loose.
Other common features include significant joint hypermobility (joints that move beyond the normal range), leading to frequent dislocations or subluxations (partial dislocations). Facial characteristics may include widely spaced eyes, a broad nasal bridge, and small jaw. Hernias, particularly umbilical hernias, are also frequently observed. In some cases, there can be fragility of internal organs, such as the bowel, which may require careful monitoring [PMID:1918735]. The severity of these symptoms can vary considerably between affected individuals.
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Affected organs
EDS-DS primarily affects organs rich in collagen, a key component of connective tissue. The most significantly affected organ is the skin, leading to extreme fragility, easy tearing, and impaired wound healing. Joints are also commonly affected, exhibiting hypermobility and instability due to weakened connective tissues surrounding them.
Internal organs can also be impacted. Hernias, which occur when an organ pushes through a weak spot in surrounding muscle or tissue, are common. Less frequently, there may be fragility in the walls of blood vessels or internal organs like the bowel, increasing the risk of complications such as rupture. The eyes may also show signs of fragility, though this is less common than skin or joint issues.
Risks & severity
The severity of Ehlers-Danlos syndrome, dermatosparaxis type, can vary widely, even within the same family. The primary risks are related to skin fragility, which can lead to recurrent wounds, infections, and significant scarring. Joint hypermobility increases the risk of dislocations and chronic pain. Early onset of symptoms, typically from birth or early infancy, is characteristic.
While EDS-DS is not generally considered life-limiting, severe complications, such as rupture of internal organs or major blood vessels, can occur in rare instances. These potential complications highlight the importance of careful medical management and monitoring throughout an affected individual's life. Exact prevalence figures for EDS-DS are not well established due to its extreme rarity, but it is considered one of the rarest forms of Ehlers-Danlos syndrome.
Genetic causes
Ehlers-Danlos syndrome, dermatosparaxis type, is caused by pathogenic variants in the ADAMTS2 gene. This gene provides instructions for making an enzyme called ADAMTS-2 (A Disintegrin-like And Metalloproteinase with ThromboSpondin Type 1 Motif 2) [PMID:33673305]. The ADAMTS-2 enzyme plays a crucial role in the processing of procollagen, a precursor molecule to mature collagen.
Specifically, ADAMTS-2 is responsible for cleaving (cutting) specific parts of the procollagen molecule to allow it to assemble correctly into strong, mature collagen fibrils. These fibrils are essential for the structural integrity of connective tissues throughout the body. When pathogenic variants occur in ADAMTS2, the ADAMTS-2 enzyme either works improperly or is not produced in sufficient amounts. This leads to a build-up of unprocessed procollagen, resulting in disorganised and weakened collagen fibres, which underlies the symptoms observed in EDS-DS [PMID:1918735].
- ADAMTS2 ADAM metallopeptidase with thrombospondin type 1 motif 2The ADAMTS2 gene provides instructions for making an enzyme essential for processing procollagen, a precursor to collagen, which is vital for the strength and elasticity of connective tissues.
Inheritance pattern
Ehlers-Danlos syndrome, dermatosparaxis type, is inherited in an autosomal recessive pattern. This means that an individual must inherit two altered copies of the ADAMTS2 gene - one from each parent - to develop the condition.
Parents who each carry one altered copy of the ADAMTS2 gene are known as carriers. Carriers typically do not show any symptoms of EDS-DS because they have one working copy of the gene. With each pregnancy, if both parents are carriers, there is a 25% chance their child will inherit two altered copies and develop EDS-DS, a 50% chance their child will be a carrier like them, and a 25% chance their child will inherit two normal copies of the gene.
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 Ehlers-Danlos syndrome, dermatosparaxis type, is often suspected based on characteristic clinical features such as extremely fragile skin, joint hypermobility, and distinctive facial appearance. However, definitive diagnosis requires genetic testing.
Genetic testing for EDS-DS typically involves a blood sample to analyse the ADAMTS2 gene for pathogenic variants. This genetic testing falls under the NHS Genomic Medicine Service and may be requested by a clinical geneticist or other specialist. The relevant R-code for testing the ADAMTS2 gene is R378 Ehlers Danlos syndromes and other collagen disorders. Referral to a clinical genetics service is usually the pathway to access such specialised testing and receive comprehensive genetic counselling.
Management & lifestyle
The management of Ehlers-Danlos syndrome, dermatosparaxis type, focuses on symptom relief, preventing complications, and improving quality of life. There is currently no cure for EDS-DS, so treatment is supportive and multidisciplinary. This often involves a team of specialists including dermatologists, orthopaedists, physiotherapists, and geneticists.
Careful skin protection is paramount to minimise trauma and prevent severe tearing. This may involve protective clothing and diligent wound care to prevent infection. Physiotherapy and occupational therapy can help manage joint hypermobility, improve muscle strength, and provide strategies for joint protection. Regular monitoring for potential internal organ complications, such as hernias, is also important. Genetic counselling is vital to help individuals and families understand the condition, its inheritance pattern, and options for family planning.
UK care pathway
In the UK, individuals suspected of having Ehlers-Danlos syndrome, dermatosparaxis type, typically enter the NHS Genomic Medicine Service pathway. This journey usually begins with a referral from a GP or specialist to a regional clinical genetics service. These services specialise in diagnosing and managing rare genetic conditions.
Clinical geneticists and genetic counsellors will assess clinical features, coordinate genetic testing (often using R-codes like R378 for Ehlers-Danlos syndromes), interpret results, and provide comprehensive support. They can also connect patients with appropriate specialist teams for ongoing care and management tailored to their specific needs.
Frequently asked questions
How rare is Ehlers-Danlos syndrome, dermatosparaxis type?
EDS-DS is considered an extremely rare condition, with only a small number of cases reported worldwide. Due to its rarity, precise prevalence figures are not fully established.
Is there a cure for EDS-DS?
Currently, there is no cure for Ehlers-Danlos syndrome, dermatosparaxis type. Management focuses on treating symptoms, preventing complications, and improving the individual's quality of life through multidisciplinary care.
Can EDS-DS affect internal organs?
Yes, while skin and joints are primarily affected, EDS-DS can impact internal organs. Hernias are common, and in some rare instances, there can be fragility of internal organ walls, such as the bowel or blood vessels.
How is EDS-DS inherited?
EDS-DS is inherited in an autosomal recessive pattern. This means an individual must inherit two altered copies of the ADAMTS2 gene, one from each parent, to develop the condition. Parents who carry one altered copy are typically unaffected.
What kind of doctors treat EDS-DS?
Management of EDS-DS typically involves a team of specialists. This may include clinical geneticists, dermatologists for skin care, orthopaedists for joint issues, physiotherapists, and other specialists as needed, depending on the specific symptoms.
References
- Van Damme T, Colige A, Syx D. Expanding the clinical and mutational spectrum of the Ehlers-Danlos syndrome, dermatosparaxis type. Genetics in medicine : official journal of the American College of Medical Genetics. 2016. PMID: 26765342
- Vanlerberghe R, Colige A, Malfait AM. ADAMTS2: More than a procollagen N-proteinase. Genes & diseases. 2025. PMID: 40837410
- Malfait F, De Coster P, Hausser I. The natural history, including orofacial features of three patients with Ehlers-Danlos syndrome, dermatosparaxis type (EDS type VIIC). American journal of medical genetics. Part A. 2004. PMID: 15389701