Only comments seeking to improve the quality and accuracy of information on the Orphanet website are accepted. For all other comments, please send your remarks via contact us. Only comments written in English can be processed. Epidermolysis bullosa simplex with pyloric atresia EBS-PA is a basal subtype of epidermolysis bullosa simplex EBS, see this term characterized by generalized severe blistering with widespread congenital absence of skin and pyloric atresia.
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Epidermolysis bullosa simplex is one of a group of genetic conditions called epidermolysis bullosa that cause the skin to be very fragile and to blister easily.
Blisters and areas of skin loss erosions occur in response to minor injury or friction, such as rubbing or scratching. Epidermolysis bullosa simplex is one of the major forms of epidermolysis bullosa. The signs and symptoms of this condition vary widely among affected individuals. Blistering primarily affects the hands and feet in mild cases, and the blisters usually heal without leaving scars.
Severe cases of this condition involve widespread blistering that can lead to infections, dehydration, and other medical problems. Severe cases may be life-threatening in infancy. Researchers have identified four major types of epidermolysis bullosa simplex. Although the types differ in severity, their features overlap significantly, and they are caused by mutations in the same genes. Most researchers now consider the major forms of this condition to be part of a single disorder with a range of signs and symptoms.
The mildest form of epidermolysis bullosa simplex , known as the localized type formerly called the Weber-Cockayne type , is characterized by skin blistering that begins anytime between childhood and adulthood and is usually limited to the hands and feet. Later in life, skin on the palms of the hands and soles of the feet may thicken and harden hyperkeratosis.
The Dowling-Meara type is the most severe form of epidermolysis bullosa simplex. Extensive, severe blistering can occur anywhere on the body, including the inside of the mouth, and blisters may appear in clusters.
Blistering is present from birth and tends to improve with age. Affected individuals also experience abnormal nail growth and hyperkeratosis of the palms and soles. Another form of epidermolysis bullosa simplex , known as the other generalized type formerly called the Koebner type , is associated with widespread blisters that appear at birth or in early infancy.
The blistering tends to be less severe than in the Dowling-Meara type. Epidermolysis bullosa simplex with mottled pigmentation is characterized by patches of darker skin on the trunk, arms, and legs that fade in adulthood. This form of the disorder also involves skin blistering from early infancy, hyperkeratosis of the palms and soles, and abnormal nail growth.
In addition to the four major types described above, researchers have identified another skin condition related to epidermolysis bullosa simplex , which they call the Ogna type. It is caused by mutations in a gene that is not associated with the other types of epidermolysis bullosa simplex.
It is unclear whether the Ogna type is a subtype of epidermolysis bullosa simplex or represents a separate form of epidermolysis bullosa. Several other variants of epidermolysis bullosa simplex have been proposed, but they appear to be very rare. The exact prevalence of epidermolysis bullosa simplex is unknown, but this condition is estimated to affect 1 in 30, to 50, people. The localized type is the most common form of the condition. These genes provide instructions for making proteins called keratin 5 and keratin These tough, fibrous proteins work together to provide strength and resiliency to the outer layer of the skin the epidermis.
Mutations in either the KRT5 or KRT14 gene prevent the keratin proteins from assembling into strong networks, causing cells in the epidermis to become fragile and easily damaged. As a result, the skin is less resistant to friction and minor trauma and blisters easily. In rare cases, no KRT5 or KRT14 gene mutations are identified in people with one of the four major types of epidermolysis bullosa simplex. Mutations in another gene, PLEC , have been associated with the rare Ogna type of epidermolysis bullosa simplex.
The PLEC gene provides instructions for making a protein called plectin, which helps attach the epidermis to underlying layers of skin.
Researchers are working to determine how PLEC gene mutations lead to the major features of the condition. Epidermolysis bullosa simplex is usually inherited in an autosomal dominant pattern, which means one copy of the altered gene in each cell is sufficient to cause the disorder.
Some affected people inherit the mutation from one affected parent. Other cases result from new mutations in the gene and occur in people with no history of the disorder in their family. In rare cases, epidermolysis bullosa simplex is inherited in an autosomal recessive pattern.
Autosomal recessive inheritance means the condition results when two copies of the gene in each cell are altered. The parents of an individual with an autosomal recessive disorder typically each carry one copy of the altered gene, but do not show signs and symptoms of the disorder. Epidermolysis bullosa simplex with PLEC mutations: new phenotypes and new mutations.
Br J Dermatol. Epidermolysis bullosa simplex: a paradigm for disorders of tissue fragility. J Clin Invest. Epub Jul 1. Inherited epidermolysis bullosa: new diagnostic criteria and classification. Clin Dermatol. Progress in epidermolysis bullosa: the phenotypic spectrum of plectin mutations. Exp Dermatol. Epidermolysis Bullosa Simplex. J Invest Dermatol. The keratins and their disorders. Sprecher E. Epidermolysis bullosa simplex. Dermatol Clin.
Epidermolysis bullosa simplex
NCBI Bookshelf. Epidermolysis bullosa simplex EBS is characterized by fragility of the skin and mucosal epithelia in some cases that results in non-scarring blisters and erosions caused by minor mechanical trauma. The current classification of epidermolysis bullosa EB includes two major types and 17 minor subtypes of EBS; all share the common feature of blistering above the dermal-epidermal junction at the ultrastructural level. The phenotypes for these subtypes range from relatively mild blistering of the hands and feet to more generalized blistering, which can be fatal.
Only comments seeking to improve the quality and accuracy of information on the Orphanet website are accepted. For all other comments, please send your remarks via contact us. Only comments written in English can be processed. Onset of the disease is usually at birth. Blistering tendency usually worsens in summertime or in warm weather. The frequency of milia, mild atrophic scarring, focal plantar hyperkeratosis and nail dystrophy is intermediate between that of localized EBS and EBS-DM see these terms , and extracutaneous findings, other than occasional intraoral blistering, are rare.
Epidermolysis bullosa simplex is one of a group of genetic conditions called epidermolysis bullosa that cause the skin to be very fragile and to blister easily. Blisters and areas of skin loss erosions occur in response to minor injury or friction, such as rubbing or scratching. Epidermolysis bullosa simplex is one of the major forms of epidermolysis bullosa. The signs and symptoms of this condition vary widely among affected individuals. Blistering primarily affects the hands and feet in mild cases, and the blisters usually heal without leaving scars. Severe cases of this condition involve widespread blistering that can lead to infections, dehydration, and other medical problems.