Encyclopedia
Czech dysplasia is an inherited condition that affects joint function and bone development.
- genetic conditions
1. Introduction
People with this condition have joint pain (osteoarthritis) that begins in adolescence or early adulthood. The joint pain mainly affects the hips, knees, shoulders, and spine and may impair mobility. People with Czech dysplasia often have shortened bones in their third and fourth toes, which make their first two toes appear unusually long. Affected individuals may have flattened bones of the spine (platyspondyly) or an abnormal spinal curvature, such as a rounded upper back that also curves to the side (kyphoscoliosis). Some people with Czech dysplasia have progressive hearing loss.
2. Frequency
The prevalence of Czech dysplasia is unknown; at least 11 families have been affected. Most of these families reside in the Czech Republic.
3. Causes
Czech dysplasia is caused by a particular mutation in the COL2A1 gene. The COL2A1 gene provides instructions for making a protein that forms type II collagen. This type of collagen is found mostly in the clear gel that fills the eyeball (the vitreous) and in cartilage. Cartilage is a tough, flexible tissue that makes up much of the skeleton during early development. Most cartilage is later converted to bone, except for the cartilage that continues to cover and protect the ends of bones and is present in the nose and external ears. Type II collagen is essential for the normal development of bones and other connective tissues that form the body's supportive framework. Mutations in the COL2A1 gene interfere with the assembly of type II collagen molecules, which prevents bones and other connective tissues from developing properly.
4. Inheritance
Czech dysplasia is inherited in an autosomal dominant pattern, which means one copy of the altered COL2A1 gene in each cell is sufficient to cause the disorder.
All known individuals with Czech dysplasia inherited the mutation from a parent with the condition.
5. Other Names for This Condition
- Czech dysplasia, metatarsal type
- progressive pseudorheumatoid dysplasia with hypoplastic toes
- SED with metatarsal shortening
- spondyloarthropathy with short third and fourth toes
- spondyloepiphyseal dysplasia with metatarsal shortening
This entry is adapted from the peer-reviewed paper https://medlineplus.gov/genetics/condition/czech-dysplasia
References
- Hoornaert KP, Marik I, Kozlowski K, Cole T, Le Merrer M, Leroy JG, Coucke PJ, Sillence D, Mortier GR. Czech dysplasia metatarsal type: another type II collagendisorder. Eur J Hum Genet. 2007 Dec;15(12):1269-75.
- Kozlowski K, Marik I, Marikova O, Zemkova D, Kuklik M. Czech dysplasiametatarsal type. Am J Med Genet A. 2004 Aug 15;129A(1):87-91.
- Marik I, Marikova O, Zemkova D, Kuklik M, Kozlowski K. Dominantly inheritedprogressive pseudorheumatoid dysplasia with hypoplastic toes. Skeletal Radiol.2004 Mar;33(3):157-64.
- Tzschach A, Tinschert S, Kaminsky E, Lusga E, Mundlos S, Graul-Neumann LM.Czech dysplasia: report of a large family and further delineation of thephenotype. Am J Med Genet A. 2008 Jul 15;146A(14):1859-64. doi:10.1002/ajmg.a.32389.
