A Recessive Form of the Ehlers–Danlos Syndrome Caused by Tenascin-X Deficiency

Abstract
The Ehlers–Danlos syndrome is a heritable connective-tissue disorder caused by defects in fibrillar-collagen metabolism. Mutations in the type V collagen genes account for up to 50 percent of cases of classic Ehlers–Danlos syndrome, but many other cases are unexplained. We investigated whether the deficiency of the tenascins, extracellular-matrix proteins that are highly expressed in connective tissues, was associated with the Ehlers–Danlos syndrome.