COL6A2 and Congenital muscular dystrophy, Ullrich type: In both breeds, the differential expression of two genes coding for collagens were detected, namely, COL6A1 and COL6A2. Both COL6A2 and its paralog COL6A1 contribute to the organization of matrix components by binding several extracellular matrix proteins and are related to the occurrence of muscle dystrophy and myopathy (bethlem mopathy 1 and ullrich congenital muscular dystrophy 1) [38,39].