Ullrich congenital muscular dystrophy-1 (UCMD1) is characterized by generalized muscle weakness and striking hypermobility of distal joints in conjunction with variable contractures of more proximal joints and normal intelligence. Additional findings may include kyphoscoliosis, protruded calcanei, and follicular hyperkeratosis. Some patients manifest at birth and never achieve independent ambulation, whereas others maintain ambulation into adulthood. Progressive scoliosis and deterioration of respiratory function is a typical feature (summary by Kirschner, 2013).
Genetic Heterogeneity of Ullrich Congenital Muscular Dystrophy
See also UCMD1B (620727), caused by mutation in the COL6A2 gene (120240) on chromosome 21q22; UCMD1C (620728), caused by mutation in the COL6A3 gene (120250) on chromosome 2q37; and UCMD2 (616470), caused by mutation in the COL12A1 gene (120320) on chromosome 6q13-q14. [from
OMIM]