title: ANO5 mutations in the Dutch limb girdle muscular dystrophy population.
abstract: A Dutch cohort of 105 limb girdle muscular dystrophy (LGMD) patients were subject to subsequent genetic investigations. In half the families a causative mutation was found. Recently mutations were identified in ANO5 causing LGMD2L and Miyoshi-like myopathy (MMD3), but could also be found in patients with hyperCKemia only. Therefore, we analysed the index cases of the remaining 31 as yet undiagnosed families from our previously described cohort of LGMD patients for the presence of ANO5 mutations. Detailed history and neurological examination were available for all patients. Serum creatine kinase (CK) activity, skeletal muscle computed tomography (CT) and cardiological investigations were performed. Mutations in ANO5 were found in 16% of the families: 11 index patients and two sibs, eight males and five females. The founder mutation c.191dupA was present in 8 out of 13 patients. Ten different pathogenic mutations were identified of which seven were novel: five missense and two splice site mutations. The age of these patients ranged from 26 to 69 years and the age of onset varied from 21 to 57 years. Symptoms at onset were related to proximal leg weakness. The weakness was slowly progressive. Calf hypertrophy was present in three patients. Males were more severely affected than females. Serum CK activity was highly elevated in the early stage of disease and moderately increased in later stages. Muscle biopsy showed predominantly dystrophic changes. One patient had hypertrophic cardiomyopathy, two others had intraventricular septum thickening.
authors.affiliation: Department of Neurology, Academic Medical Centre, University of Amsterdam, Amsterdam, The Netherlands. a.j.kooi@amc.uva.nl
authors.forename: Anneke J
authors.initials: AJ
authors.lastname: van der Kooi
authors.forename: Leroy
authors.initials: L
authors.lastname: Ten Dam
authors.forename: Wendy S
authors.initials: WS
authors.lastname: Frankhuizen
authors.forename: Chiara S M
authors.initials: CS
authors.lastname: Straathof
authors.forename: Pieter A
authors.initials: PA
authors.lastname: van Doorn
authors.forename: Marianne
authors.initials: M
authors.lastname: de Visser
authors.forename: Ieke B
authors.initials: IB
authors.lastname: Ginjaar
mesh_terms: D000328:Adult; D000368:Aged; D000075368:Anoctamins; D018118:Chloride Channels / Q000235:genetics*; D015331:Cohort Studies; D049310:Distal Myopathies / Q000175:diagnosis / Q000235:genetics*; D005260:Female; D020022:Genetic Predisposition to Disease; D006801:Humans; D008297:Male; D008875:Middle Aged; D009124:Muscle Proteins / Q000235:genetics*; D009133:Muscular Atrophy / Q000175:diagnosis / Q000235:genetics*; D049288:Muscular Dystrophies, Limb-Girdle / Q000175:diagnosis / Q000235:genetics*; D009154:Mutation / Q000235:genetics*; D009426:Netherlands; D010375:Pedigree; D055815:Young Adult
chemical_list: C547813:ANO5 protein, human; D000075368:Anoctamins; D018118:Chloride Channels; D009124:Muscle Proteins