Epidermolysis bullosa dystrophica

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Epidermolysis bullosa dystrophica Classification and external resources
ICD-10	Q81.2
ICD-9	757.39
OMIM	131750
DiseasesDB	29580
MeSH	D016108

Epidermolysis bullosa dystrophica or Dystrophic EB (DEB) forms which can lead to scarring occur in a deeper tissue level; the sub-lamina densa region (the beneath the lamina densa) within the upper dermis. The disease DEB is caused by genetic defects (or mutations) within the molecule type VII collagen (collagen VII). Collagen VII is a very large molecule (780 nm) that dimerizes to forms a semicircular looping structure: the anchoring fibril. Anchoring fibrils are thought to form a structural link between the epidermal basement membrane and the fibrillar collagens in the upper dermis.

Collagen VII is also present in the epithelial tissue of the esophagus, which leads to chronic scarring, webbing, and obstruction. Affected individuals are often severely malnourished due to trauma to the oral and esophageal mucosa and require feeding tubes for nutrition. They also suffer from iron-deficiency anemia of uncertain origin, which leads to chronic fatigue.

Open wounds on the skin heal slowly or not at all, often scarring extensively, and are particularly susceptible to infection. Many individuals bathe in a bleach and water mixture to fight off these infections.

The chronic inflammation leads to errors in the DNA of the affected skin cells, which in turn causes squamous cell carcinoma (SCC). The majority of these patients die before the age of 30, either of SCC or complications related to DEB.

External links

• ebd at NIH/UW GeneTests
• 1959788591 at GPnotebook

v • d • e Congenital malformations and deformations of integument (Q80-Q84, 757)
Congenital ichthyosis	Epidermolytic hyperkeratosis - Harlequin type ichthyosis - Ichthyosis lamellaris - Ichthyosis vulgaris - Netherton's syndrome - X-linked ichthyosis - Zunich-Kaye syndrome
Epidermolysis bullosa	Epidermolysis bullosa simplex - Epidermolysis bullosa dystrophica
Other skin disease	Hereditary lymphedema - Mastocytosis - Urticaria pigmentosa - Incontinentia pigmenti - Ectodermal dysplasia - EEM syndrome - Hay-Wells syndrome - Kindler syndrome - Port-wine stain - Cutis laxa - Darier's disease - Pseudoxanthoma elasticum DNA repair-deficiency disorder: Bloom syndrome - Rothmund-Thomson syndrome - Xeroderma pigmentosum
Nail disease	Leukonychia - Pachyonychia congenita
Malformations of breast	Amastia - Accessory breast - Athelia - Supernumerary nipple - Micromastia
Hair disease	Monilethrix - Sabinas brittle hair syndrome
see also non-congenital (L, 680-709)