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Bethlem myopathy 1A

MedGen UID:
893688
Concept ID:
CN029274
Disease or Syndrome
Synonyms: Bethlem myopathy 1; Myopathy, benign congenital, with contractures
 
Gene (location): COL6A1 (21q22.3)
 
Monarch Initiative: MONDO:0024530
OMIM®: 158810

Disease characteristics

Excerpted from the GeneReview: Collagen VI-Related Dystrophies
Collagen VI-related dystrophies (COL6-RDs) represent a continuum of overlapping clinical phenotypes with Bethlem muscular dystrophy at the milder end, Ullrich congenital muscular dystrophy (UCMD) at the more severe end, and a phenotype in between UCMD and Bethlem muscular dystrophy, referred to as intermediate COL6-RD. Bethlem muscular dystrophy is characterized by a combination of proximal muscle weakness and joint contractures. Hypotonia and delayed motor milestones occur in early childhood; mild hypotonia and weakness may be present congenitally. By adulthood, there is evidence of proximal weakness and contractures of the elbows, Achilles tendons, and long finger flexors. The progression of weakness is slow, and more than two thirds of affected individuals older than age 50 years remain independently ambulatory indoors, while relying on supportive means for mobility outdoors. Respiratory involvement is not a consistent feature. UCMD is characterized by congenital weakness, hypotonia, proximal joint contractures, and striking hyperlaxity of distal joints. Decreased fetal movements are frequently reported. Some affected children acquire the ability to walk independently; however, progression of the disease results in a loss of ambulation by age ten to eleven years. Early and severe respiratory insufficiency occurs in all individuals, resulting in the need for nocturnal noninvasive ventilation (NIV) in the form of bilevel positive airway pressure (BiPAP) by age 11 years. Intermediate COL6-RD is characterized by independent ambulation past age 11 years and respiratory insufficiency that is later in onset than in UCMD and results in the need for NIV in the form of BiPAP by the late teens to early 20s. In contrast to individuals with Bethlem muscular dystrophy, those with intermediate COL6-RD typically do not achieve the ability to run, jump, or climb stairs without use of a railing. [from GeneReviews]
Authors:
A Reghan Foley  |  Payam Mohassel  |  Sandra Donkervoort, et. al.   view full author information

Term Hierarchy

CClinical test,  RResearch test,  OOMIM,  GGeneReviews,  VClinVar  

Recent clinical studies

Etiology

Bovolenta M, Neri M, Martoni E, Urciuolo A, Sabatelli P, Fabris M, Grumati P, Mercuri E, Bertini E, Merlini L, Bonaldo P, Ferlini A, Gualandi F
BMC Med Genet 2010 Mar 19;11:44. doi: 10.1186/1471-2350-11-44. PMID: 20302629Free PMC Article

Diagnosis

Bovolenta M, Neri M, Martoni E, Urciuolo A, Sabatelli P, Fabris M, Grumati P, Mercuri E, Bertini E, Merlini L, Bonaldo P, Ferlini A, Gualandi F
BMC Med Genet 2010 Mar 19;11:44. doi: 10.1186/1471-2350-11-44. PMID: 20302629Free PMC Article

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