Facioscapulohumeral muscular dystrophy

Rabi Tawil MD (

Dr. Tawil of the University of Rochester School of Medicine and Dentistry received consulting fees from Fulcrum and Ultragenyx, and fees from Acceleron as a clinical trial site investigator.

)
Leo H Wang MD PhD (Dr. Wang of the University of Washington School of Medicine has no relevant financial relationships to disclose.)
Emma Ciafaloni MD, editor. (

Dr. Ciafaloni of the University of Rochester received consulting fees from Biogen and Pfeizer and research grants from Sarepta and Santhera.

)
Originally released March 9, 1995; last updated January 3, 2019; expires January 3, 2022

This article includes discussion of facioscapulohumeral muscular dystrophy, Landouzy-Dejerine muscular dystrophy, facioscapulohumeral disease, facioscapulohumeral dystrophy, facioscapulohumeral syndrome, FSHD, and FSHMD. The foregoing terms may include synonyms, similar disorders, variations in usage, and abbreviations.

Overview

Facioscapulohumeral muscular dystrophy (FSHD) is a dominantly inherited, clinically recognizable, and relatively common muscular dystrophy. It does not curtail longevity much, but about 20% of patients use a wheelchair after the age of 50. The differential diagnosis is confined to few other conditions, including some limb-girdle dystrophies, a neurogenic form, a scapuloperoneal myopathy, and rare mitochondrial myopathies. The molecular genetic mechanism of FSHD has, until recently, remained enigmatic. The author explains the recent breakthroughs in our understanding of the molecular mechanism underlying FSHD. To date, there is no effective medical treatment, but many affected people continue to work.

Key points

 

• Facioscapulohumeral muscular dystrophy (FSHD) can be recognized by inspection and clinical examination; the diagnosis can be confirmed by genetic testing.

 

• Differential diagnosis is limited to few other conditions.

 

• Inheritance is autosomal dominant in most with a high incidence of sporadic cases due to de novo mutations.

 

• Although genetically distinct, both FSHD1 and FSHD2 result from expression of a normally silenced gene, DUX4.

 

• Drug treatment is not available, but longevity is almost normal.

 

• Scapular fixation cannot be subject to a blinded, controlled therapeutic trial, but it is gaining in use. Recently published evidence-based care guidelines provide useful information for managing FSHD and its potential complications.

Historical note and terminology

Landouzy and Dejerine described the disease and gained the eponym (Landouzy and Dejerine 1885) even though Duchenne had earlier published a photograph of a patient with typical findings (Duchenne 1862). Justin-Bescanon described 3 later generations in the Landouzy-Dejerine family, including the autopsy of one of the original patients who died at 86 years of age (Justin-Bescanon et al 1964). These original reports remain astute descriptions of the disease, describing the autosomal dominant pattern of inheritance, the protean clinical manifestation, including the mild course of many affected family members, with one of their patients having evident facial weakness at 9 years of age but did not have symptomatic limb weakness until 60 years of age.

Comprehensive reviews (Tawil and van der Maarel 2006; van der Maarel et al 2007; Wang and Tawil 2016) and a multi-authored monograph (Upadhyaya and Cooper 2004) summarize all of the clinical aspects of facioscapulohumeral muscular dystrophy in detail. AAN guidelines now provide evidence-based guidelines for the management of FSHD (Tawil et al 2015). Two expert opinion-based clinical practice recommendations provide guidance for the management of individuals with facioscapulohumeral muscular dystrophy (Tawil et al 2010; Attarian et al 2012). FSHD is the consensus abbreviation.

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