COL1A2 and Ehlers-Danlos syndrome, dermatosparaxis type: Biallelic defects in the ADAMTS2 gene, resulting in a loss of ADAMTS2 enzyme activity and consequent retention of N-propeptides in type I procollagen molecules, lead to the rare monogenic disease Ehlers-Danlos syndrome dermatosparaxis type (dEDS) in humans, and dermatosparaxis in animals, conditions that are hallmarked by extreme fragility of the skin and other soft connective tissues.