SCIENTIFIC BACKGROUND

COL2A1

Spondyloepiphyseal dysplasia (SED) is a rare autosomal dominant inherited type II collagen disease.

 

Affected children are small in stature, have club feet, a flat face and wide-set eyes. The head appears to rest directly on the trunk. The thorax often shows barrel-shaped deformities. The extremities are short but relatively long in relation to the upper body. Myopia occurs in 40% of cases and retinal detachment is possible. Adult height varies between 85-135 cm. X-rays classically show delayed ossification.

 

As a rule, SED is caused by variants in the COL2A1 gene, which lead to a lack of type II collagen. The variants usually result in the amino acid glycine being replaced by serine. If glycine is substituted by an amino acid other than serine, a more severe phenotype develops.

 

In addition, a recessive form with a severe phenotype and variants in the COL2A1 gene has also been described.

GENES

COL2A1
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