Congenital stromal corneal dystrophy

Congenital stromal corneal dystrophy

The cornea is particularly opaque in the anterior stroma by slit-lamp biomicroscopy
Classification and external resources
OMIM	610048

Congenital stromal dystrophy. Transmission electron microscopy of the corneal stroma showing normal collagen lamellae separated by abnormal randomly distributed collagen filaments in an electron-lucent extracellular matrix.

Congenital stromal corneal dystrophy (CSCD), also called Witschel dystrophy, is an extremely rare, autosomal dominant form of corneal dystrophy.^[1] Only 4 families have been reported to have the disease by 2009.^[2] The main features of the disease are numerous opaque flaky or feathery areas of clouding in the stroma that multiply with age and eventually preclude visibility of the endothelium. Strabismus or primary open angle glaucoma was noted in some of the patients. Thickness of the cornea stays the same, Descemet's membrane and endothelium are relatively unaffected, but the fibrills of collagen that constitute stromal lamellae are reduced in diameter and lamellae themselves are packed significantly more tightly.

Genetics

Congenital stromal corneal dystrophy has an autosomal dominant pattern of inheritance.

CSCD is associated with a mutation in the gene DCN that encodes the protein decorin, located at chromosome 12q22.^[1] The disorder is inherited in an autosomal dominant manner,^[1] which indicates that the defective gene responsible for a disorder is located on an autosome (chromosome 12 is an autosome), and only one copy of the gene is sufficient to cause the disorder, when inherited from a parent who has the disorder.

References

1 2 3 Bredrup, C.; Knappskog, P. M.; Majewski, J.; Rødahl, E.; Boman, H. (February 2005). "Congenital stromal dystrophy of the cornea caused by a mutation in the decorin gene" (Free full text). Invest Ophthalmol Vis Sci. 46 (2): 420–426. doi:10.1167/iovs.04-0804. PMID 15671264.
↑ Klintworth GK (2009). "Corneal dystrophies". Orphanet J Rare Dis. 4: 7. doi:10.1186/1750-1172-4-7. PMC 2695576. PMID 19236704.

External links

GeneReviews/NCBI/NIH/UW entry on Congenital Stromal Corneal Dystrophy

Types of corneal dystrophy (H18.5, 371.5)

Epithelial and subepithelial	Epithelial basement membrane dystrophy Gelatinous drop-like corneal dystrophy Lisch epithelial corneal dystrophy Meesmann corneal dystrophy Subepithelial mucinous corneal dystrophy

Bowman's membrane	Reis–Bucklers corneal dystrophy Thiel-Behnke dystrophy

Stroma	Congenital stromal corneal dystrophy Fleck corneal dystrophy Granular corneal dystrophy Lattice corneal dystrophy Macular corneal dystrophy Posterior amorphous corneal dystrophy Schnyder crystalline corneal dystrophy

Descemet's membrane and endothelial	Congenital hereditary endothelial dystrophy Fuchs' dystrophy Posterior polymorphous corneal dystrophy X-linked endothelial corneal dystrophy

Diseases of collagen, laminin and other scleroproteins

Collagen disease

COL1:	Osteogenesis imperfecta Ehlers–Danlos syndrome, types 1, 2, 7

COL2:	Hypochondrogenesis Achondrogenesis type 2 Stickler syndrome Marshall syndrome Spondyloepiphyseal dysplasia congenita Spondyloepimetaphyseal dysplasia, Strudwick type Kniest dysplasia (see also C2/11)

COL3:	Ehlers–Danlos syndrome, types 3 & 4 Sack–Barabas syndrome

COL4:	Alport syndrome

COL5:	Ehlers–Danlos syndrome, types 1 & 2

COL6:	Bethlem myopathy Ullrich congenital muscular dystrophy

COL7:	Epidermolysis bullosa dystrophica Recessive dystrophic epidermolysis bullosa Bart syndrome Transient bullous dermolysis of the newborn

COL8:	Fuchs' dystrophy 1

COL9:	Multiple epiphyseal dysplasia 2, 3, 6

COL10:	Schmid metaphyseal chondrodysplasia

COL11:	Weissenbacher–Zweymüller syndrome Otospondylomegaepiphyseal dysplasia (see also C2/11)

COL17:	Bullous pemphigoid

Laminin

Other

see also fibrous proteins

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