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Ehlers-Danlos syndrome (dermatosparaxis)
This condition primarily affects the skin, making it highly susceptible to tearing and bruising, and can also lead to joint hypermobility. It is caused by genetic changes that disrupt the normal formation of collagen, a crucial protein for connective tissues.
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Overview
Ehlers-Danlos syndrome (dermatosparaxis type, often shortened to EDS dermatosparaxis) is a very rare, inherited disorder that affects the body's connective tissue. Connective tissue provides strength and elasticity to many parts of the body, including the skin, joints, and blood vessels. In EDS dermatosparaxis, a problem with collagen - a key protein in connective tissue - leads to its characteristic features.
The main features of EDS dermatosparaxis include extremely fragile and easily bruised skin, which can tear with minimal trauma. Individuals may also experience joint hypermobility, meaning their joints can move beyond the typical range. This condition is present from birth, though some signs may become more apparent as a child grows. Due to its rarity, the exact prevalence of EDS dermatosparaxis is not well established [PMID:33659223].
Symptoms & clinical features
The hallmark symptom of Ehlers-Danlos syndrome (dermatosparaxis) is very delicate skin that bruises easily and is prone to tearing, even from minor bumps or friction. This can lead to frequent scarring, particularly over bony areas. The skin may also feel soft and doughy to the touch and appear wrinkled, especially around the eyes and mouth [PMID:33659223].
Beyond skin fragility, affected individuals often have joint hypermobility, which can vary in severity. This means joints may be unusually flexible and prone to dislocations or subluxations (partial dislocations). Other features can include umbilical hernias, where part of the intestine protrudes through the abdominal wall near the belly button, and sometimes eye abnormalities, such as blue sclera (the white part of the eye appearing bluish). Dental problems, such as crowded teeth, may also be observed.
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Affected organs
Ehlers-Danlos syndrome (dermatosparaxis) primarily affects organs and tissues rich in collagen, particularly the skin. The fragility and laxity of the skin are key characteristics, leading to easy bruising, tearing, and poor wound healing across the entire body.
Joints are also significantly affected, with hypermobility being a common feature. This can impact various joints throughout the body, potentially leading to discomfort, pain, and instability. In some cases, connective tissue abnormalities may also affect the eyes and lead to hernias in the abdominal wall, such as umbilical or inguinal hernias.
Risks & severity
The severity of Ehlers-Danlos syndrome (dermatosparaxis) can vary between individuals, but it is generally considered a severe form of EDS due to the pronounced skin fragility. The risk of skin tears and bruising is lifelong and requires careful management to prevent complications like infections or extensive scarring. The characteristic skin fragility can be particularly challenging in infancy and early childhood.
Joint hypermobility can range from mild flexibility to significant instability, increasing the risk of dislocations. While internal organ involvement is less common than in some other EDS types, the overall impact of the condition on daily life can be substantial due to chronic skin issues and potential joint pain or instability. There is no specific age of onset, as the features are typically present from birth or early infancy.
Genetic causes
Ehlers-Danlos syndrome (dermatosparaxis) is caused by pathogenic variants in the *ADAMTS2* gene. The *ADAMTS2* gene provides instructions for making an enzyme called ADAMTS2 (A Disintegrin-like And Metalloproteinase with ThromboSpondin Motifs type 2). This enzyme plays a crucial role in the processing of procollagen, which is a precursor molecule to collagen [PMID:11961541].
Specifically, the ADAMTS2 enzyme is responsible for cleaving (cutting) specific parts off procollagen molecules, allowing them to properly assemble into strong, mature collagen fibres. These fibres are essential for providing strength and structure to connective tissues throughout the body. When a pathogenic variant occurs in *ADAMTS2*, the enzyme may be non-functional or have reduced activity. This disrupts the normal processing of procollagen, leading to the formation of disorganised or weakened collagen fibres, which underlies the skin fragility and joint laxity seen in EDS dermatosparaxis.
- ADAMTS2 ADAM metallopeptidase with thrombospondin type 1 motif 2The ADAMTS2 gene provides instructions for creating an enzyme crucial for processing procollagen molecules, which are essential precursors to the collagen fibres that provide strength and elasticity to connective tissues.
Inheritance pattern
Ehlers-Danlos syndrome (dermatosparaxis) has an autosomal recessive inheritance pattern. This means that an individual must inherit two copies of the altered *ADAMTS2* gene - one from each parent - to develop the condition. If a person inherits only one altered copy of the gene, they are considered a carrier. Carriers typically do not show symptoms of the condition because their other, working copy of the gene can compensate.
When both parents are carriers of a pathogenic variant in *ADAMTS2*, there is a 25% (1 in 4) chance with each pregnancy that their child will inherit two altered copies and be affected by EDS dermatosparaxis. There is a 50% (1 in 2) chance that their child will be a carrier, and a 25% (1 in 4) chance that their child will inherit two normal copies of the gene and neither be affected nor a carrier. Genetic counselling can provide more detailed information for families considering these risks.
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
The diagnosis of Ehlers-Danlos syndrome (dermatosparaxis) is initially suspected based on characteristic clinical signs, particularly the extremely fragile skin, easy bruising, and joint hypermobility. A detailed medical history and physical examination are key first steps. However, due to the overlap of symptoms with other connective tissue disorders, genetic testing is essential for a definitive diagnosis.
Genetic testing involves analysing a DNA sample, typically from a blood test, to identify pathogenic variants in the *ADAMTS2* gene. This can be done through specific gene sequencing or a broader gene panel that includes *ADAMTS2*. In the UK, genetic testing for suspected Ehlers-Danlos syndromes, including dermatosparaxis type, is available through the NHS Genomic Medicine Service (GMS) under specific indications. Clinicians, often a paediatrician or a clinical geneticist, would refer individuals for appropriate genomic testing, such as through R-code R115 Ehlers-Danlos syndromes and heritable connective tissue disorders.
Management & lifestyle
The management of Ehlers-Danlos syndrome (dermatosparaxis) focuses on supportive care and preventing complications, as there is no specific cure for the underlying genetic cause. Care is typically multidisciplinary, involving various specialists to address the different symptoms. Protecting the skin is paramount: this includes avoiding trauma, using soft clothing, and careful wound care to prevent infection and minimise scarring.
For joint hypermobility, physiotherapy can help strengthen muscles around joints, improve stability, and reduce pain. Occupational therapy may offer strategies to adapt daily activities. Regular monitoring for potential complications, such as hernias, is also important. Individuals and families are encouraged to work closely with their healthcare team to develop an individualised care plan. Genetic counsellors can provide valuable support and information regarding the condition and its inheritance.
UK care pathway
In the UK, individuals suspected of having Ehlers-Danlos syndrome (dermatosparaxis) would typically be referred to a clinical genetics service. This usually occurs following an initial assessment by a GP or a specialist such as a paediatrician. The clinical genetics team can provide expert diagnosis, genetic counselling, and coordination of care.
Diagnostic genetic testing for Ehlers-Danlos syndromes is available through the NHS Genomic Medicine Service (GMS), often utilising specific R-codes such as R115 (Ehlers-Danlos syndromes and heritable connective tissue disorders). Following diagnosis, management involves a network of healthcare professionals tailored to the individual's needs, often coordinated through regional specialist centres. Genetic counsellors play a vital role in helping families understand the condition, its inheritance patterns, and the implications for family planning.
Frequently asked questions
What does 'dermatosparaxis' mean?
Dermatosparaxis literally means 'skin tearing'. This term highlights the most prominent feature of this specific type of Ehlers-Danlos syndrome, which is extremely fragile skin that tears very easily even with minor trauma.
Is Ehlers-Danlos syndrome (dermatosparaxis) the same as other types of EDS?
No, it is a distinct type of Ehlers-Danlos syndrome. While it shares some general features of connective tissue disorders like joint hypermobility, its defining characteristic of severe skin fragility and its specific genetic cause (*ADAMTS2* gene) differentiate it from other EDS types, such as classical or hypermobile EDS.
Can Ehlers-Danlos syndrome (dermatosparaxis) be cured?
Currently, there is no cure for Ehlers-Danlos syndrome (dermatosparaxis) because it is a genetic condition. Management focuses on supportive care, which includes preventing skin injuries, managing joint symptoms, and treating any complications that arise. Research into genetic conditions is ongoing.
How common is Ehlers-Danlos syndrome (dermatosparaxis)?
Ehlers-Danlos syndrome (dermatosparaxis) is considered a very rare condition. Due to its rarity, the exact number of people affected is not precisely known, but it is one of the less common forms of Ehlers-Danlos syndrome.
What kind of doctor should my child see if they have this condition?
Children with Ehlers-Danlos syndrome (dermatosparaxis) typically benefit from care coordinated by a clinical geneticist. They may also see other specialists, such as dermatologists for skin care, physiotherapists for joint mobility, and paediatricians for overall health management. A multidisciplinary team approach is often recommended.
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