Spondyloperipheral dysplasia

Spondyloperipheral dysplasia
Classification and external resources
OMIM	271700
DiseasesDB	34165

Spondyloperipheral dysplasia is an autosomal dominant^[1] disorder of bone growth. The condition is characterized by flattened bones of the spine (platyspondyly) and unusually short fingers and toes (brachydactyly). Some affected individuals also have other skeletal abnormalities, short stature, nearsightedness (myopia), hearing loss, and mental retardation. Spondyloperipheral dysplasia is a subtype of collagenopathy, types II and XI.

Cause and Genetics

Spondyloperipheral dysplasia has an autosomal dominant pattern of inheritance.

Spondyloperipheral dysplasia is one of a spectrum of skeletal disorders caused by mutations in the COL2A1 gene, located on chromosome 12q13.11-q13.2.^[2] The protein made by this gene forms type II collagen, a molecule found mostly in cartilage and in the clear gel that fills the vitreous humour (the eyeball). Type II collagen is essential for the normal development of bones and other connective tissues (the tissues that form the body's supportive framework).

Mutations in the COL2A1 gene interfere with the assembly of type II collagen molecules. The protein made by the altered COL2A1 gene cannot be used to make type II collagen, resulting in a reduced amount of this type of collagen in the body. Instead of forming collagen molecules, the abnormal protein builds up in cartilage cells (chondrocytes). These changes disrupt the normal development of bones, leading to the signs and symptoms of spondyloperipheral dysplasia.

The disorder is believed to be inherited in an autosomal dominant manner.^[1] This indicates that the defective gene responsible for the disorder is located on an autosome (chromosome 12 is an autosome), and only one copy of the defective gene is sufficient to cause the disorder, when inherited from a parent who has the disorder.

References

1 2 Zabel, B.; Hilbert, K.; Stöß, H.; Superti-Furga, A.; Spranger, J.; Winterpacht, A. (May 1996). "A specific collagen type II gene (COL2A1) mutation presenting as spondyloperipheral dysplasia". American Journal of Medical Genetics. 63 (1): 123–128. doi:10.1002/(SICI)1096-8628(19960503)63:1<123::AID-AJMG22>3.0.CO;2-P. PMID 8723097.
↑ Online Mendelian Inheritance in Man (OMIM) 120140

External links

This article incorporates public domain text from Spondyloperipheral dysplasia at NLM Genetics Home Reference

Spondyloperipheral dysplasia short ulna at NIH's Office of Rare Diseases

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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