BACKGROUND: Limb-girdle muscular dystrophy 2I (LGMD2I) is caused by mutations in the fukutin-related protein gene FKRP, which is also involved in congenital muscular dystrophy (MDC1C). OBJECTIVE: To evaluate the clinical, biological, radiological and mutational characteristics of LGMD2I patients with FKRP mutation. METHODS: Eleven patients from nine families from the north of France were studied. Demographical data, muscular testing results, cardiac and respiratory examinations, muscle histological features and a genetic analysis of the FKRP gene for each patient are reported. Eight patients underwent brain MRI and seven neuropsychological tests. RESULTS: The patients included six women and five men. The mean age at onset was 9 years (range 1.5 to 23 years). Five patients remained self-ambulatory, whereas the other six were confined to a wheelchair by a mean age of 19 years, after a mean disease duration of 10 years. Nine patients suffered from restrictive respiratory insufficiency, and two male patients had severe dilated cardiomyopathy. Neuropsychological tests revealed memory impairment in four cases. Brain MRI revealed cerebral abnormalities in four patients (4/8). Ten patients were carriers of the common L276I mutation, which was either homozygous (four patients) or heteroallelic with another mutation (six patients). Among the mutations found, three were novel: L322V, L489R and R275G. CONCLUSIONS: This study reveals inter- and intrafamilial phenotypic variability in LGMD2I, with a preponderance of myocardiopathy and restrictive respiratory insufficiency. It also demonstrates central nervous involvement, probably associated with changes in alpha-dystroglycan expression in the brain.
BACKGROUND:Limb-girdle muscular dystrophy 2I (LGMD2I) is caused by mutations in the fukutin-related protein gene FKRP, which is also involved in congenital muscular dystrophy (MDC1C). OBJECTIVE: To evaluate the clinical, biological, radiological and mutational characteristics of LGMD2I patients with FKRP mutation. METHODS: Eleven patients from nine families from the north of France were studied. Demographical data, muscular testing results, cardiac and respiratory examinations, muscle histological features and a genetic analysis of the FKRP gene for each patient are reported. Eight patients underwent brain MRI and seven neuropsychological tests. RESULTS: The patients included six women and five men. The mean age at onset was 9 years (range 1.5 to 23 years). Five patients remained self-ambulatory, whereas the other six were confined to a wheelchair by a mean age of 19 years, after a mean disease duration of 10 years. Nine patients suffered from restrictive respiratory insufficiency, and two male patients had severe dilated cardiomyopathy. Neuropsychological tests revealed memory impairment in four cases. Brain MRI revealed cerebral abnormalities in four patients (4/8). Ten patients were carriers of the common L276I mutation, which was either homozygous (four patients) or heteroallelic with another mutation (six patients). Among the mutations found, three were novel: L322V, L489R and R275G. CONCLUSIONS: This study reveals inter- and intrafamilial phenotypic variability in LGMD2I, with a preponderance of myocardiopathy and restrictive respiratory insufficiency. It also demonstrates central nervous involvement, probably associated with changes in alpha-dystroglycan expression in the brain.
Authors: D Marques-da-Silva; R Francisco; D Webster; V Dos Reis Ferreira; J Jaeken; T Pulinilkunnil Journal: J Inherit Metab Dis Date: 2017-07-19 Impact factor: 4.982
Authors: Sebahattin Cirak; Aileen Reghan Foley; Ralf Herrmann; Tobias Willer; Shu Yau; Elizabeth Stevens; Silvia Torelli; Lina Brodd; Alisa Kamynina; Petr Vondracek; Helen Roper; Cheryl Longman; Rudolf Korinthenberg; Gianni Marrosu; Peter Nürnberg; Daniel E Michele; Vincent Plagnol; Matt Hurles; Steven A Moore; Caroline A Sewry; Kevin P Campbell; Thomas Voit; Francesco Muntoni Journal: Brain Date: 2013-01-03 Impact factor: 13.501
Authors: Eric M Libell; Julia A Richardson; Katie L Lutz; Benton Y Ng; Shelley R H Mockler; Katie M Laubscher; Carrie M Stephan; Bridget M Zimmerman; Erik R Edens; Benjamin E Reinking; Katherine D Mathews Journal: Muscle Nerve Date: 2020-09-10 Impact factor: 3.217