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Schara U, Christen H, Hietala M, Hoovey Z, Krabetz K, Rodolico C, Schreiber G, Topaloglu H, Voss W, Abicht A, Müller J, Lochmüller H. G.P.10.01 Long-term follow-up in patients with congenital myasthenic syndrome due to CHAT mutations. Neuromuscul Disord 2007. [DOI: 10.1016/j.nmd.2007.06.191] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Aurino S, Cacciottolo M, Piluso G, Numitone G, Topaloglu H, Angelini C, Minetti C, Politano L, Nigro V. G.P.8.06 Limb-girdle muscular dystrophies: DNA test following protein test or not? Neuromuscul Disord 2007. [DOI: 10.1016/j.nmd.2007.06.171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Winkler J, Winner B, Bauer P, Schüle R, Köhler W, Uyanik G, Plötz S, Bogdahn U, Weber B, Oelmez A, Topaloglu H, Hehr U, Schöls L, Rieß O. Spatacsin: a new gene for complicated hereditary spastic paraplegia. AKTUELLE NEUROLOGIE 2007. [DOI: 10.1055/s-2007-987786] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Hehr U, Uyanik G, Gross C, Schuierer G, Bohring A, Cohen M, Oehl-Jaschkowitz B, Bird L, Baric I, Walter MC, Mowat D, Bogdahn U, Lochmueller H, Topaloglu H, Winkler J. Broad phenotypic spectrum of neuromuscular disorders associated with defective O-glycosylation of alpha-dystroglycan. AKTUELLE NEUROLOGIE 2007. [DOI: 10.1055/s-2007-987778] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Haliloglu G, Balci B, Talim B, Dinçer P, Topaloglu H. P.P.4 06 Limb-girdle muscular dystrophy and mental retardation (LGMD2M) has a heterogeneous background. Neuromuscul Disord 2006. [DOI: 10.1016/j.nmd.2006.05.123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Haliloglu G, Oguz KK, Orhan D, Yurdakok M, Topaloglu H. P.P.1 05 Magnetic resonance imaging findings in a newborn with merosin-deficient congenital muscular dystrophy. Neuromuscul Disord 2006. [DOI: 10.1016/j.nmd.2006.05.074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Talim B, Fütterer N, Plecko B, Kale G, Topaloglu H, Horvath R. G.P.3 02 Six children with early-onset mitochondrial encephalomyopathy and one heterozygous pathogenic mutation in POLG1. Neuromuscul Disord 2006. [DOI: 10.1016/j.nmd.2006.05.063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Godfrey C, Mein R, Brockington M, Elson E, Topaloglu H, Smith J, Escolar D, Bertini E, Merlini I, Mercuri E, Bushby K, Straub V, North K, Abbs S, Muntoni F. P.O.1 Molecular genetic analysis of 6 glycosyltransferases in a large population of dystroglycanopathy patients significantly widens the spectrum of phenotypes resulting from POMT1, POMGnT1 and Fukutin mutations. Neuromuscul Disord 2006. [DOI: 10.1016/j.nmd.2006.05.133] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Bouchet C, Manya H, Yanagisawa A, Maugenre S, Quijano-Roy S, Estournet B, Merlini L, Topaloglu H, Romero N, Leturcq F, Seta N, Endo T, Guicheney P. P.P.1 02 Combined approaches to diagnosis of congenital muscular dystrophies with α-dystroglycan hypoglycosylation. Neuromuscul Disord 2006. [DOI: 10.1016/j.nmd.2006.05.071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Senderek J, Krieger M, Stendel C, North K, Muntoni F, Quijano-Roy S, Ebinger F, Schröder J, Voit T, Weis J, Topaloglu H, Zerres K. P.I.5 Mutations in SIL1 cause Marinesco–Sjögren syndrome, a cerebellar ataxia with cataract and myopathy. Neuromuscul Disord 2006. [DOI: 10.1016/j.nmd.2006.05.132] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Haliloglu G, Oguz KK, Ozturk A, Akcoren Z, Caglar M, Topaloglu H. P.P.1 06 Magnetic resonance imaging and spectroscopy findings in a patient with partial merosin deficiency. Neuromuscul Disord 2006. [DOI: 10.1016/j.nmd.2006.05.075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Piluso G, Politano L, Aurino S, Fanin M, Ricci E, Ventriglia VM, Belsito A, Totaro A, Saccone V, Topaloglu H, Nascimbeni AC, Fulizio L, Broccolini A, Canki-Klain N, Comi LI, Nigro G, Angelini C, Nigro V. Extensive scanning of the calpain-3 gene broadens the spectrum of LGMD2A phenotypes. J Med Genet 2006; 42:686-93. [PMID: 16141003 PMCID: PMC1736133 DOI: 10.1136/jmg.2004.028738] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
BACKGROUND The limb girdle muscular dystrophies (LGMD) are a heterogeneous group of Mendelian disorders highlighted by weakness of the pelvic and shoulder girdle muscles. Seventeen autosomal loci have been so far identified and genetic tests are mandatory to distinguish among the forms. Mutations at the calpain 3 locus (CAPN3) cause LGMD type 2A. OBJECTIVE To obtain unbiased information on the consequences of CAPN3 mutations. PATIENTS 530 subjects with different grades of symptoms and 300 controls. METHODS High throughput denaturing HPLC analysis of DNA pools. RESULTS 141 LGMD2A cases were identified, carrying 82 different CAPN3 mutations (45 novel), along with 18 novel polymorphisms/variants. Females had a more favourable course than males. In 94% of the more severely affected patient group, the defect was also discovered in the second allele. This proves the sensitivity of the approach. CAPN3 mutations were found in 35.1% of classical LGMD phenotypes. Mutations were also found in 18.4% of atypical patients and in 12.6% of subjects with high serum creatine kinase levels. CONCLUSIONS A non-invasive and cost-effective strategy, based on the high throughput denaturing HPLC analysis of DNA pools, was used to obtain unbiased information on the consequences of CAPN3 mutations in the largest genetic study ever undertaken. This broadens the spectrum of LGMD2A phenotypes and sets the carrier frequency at 1:103.
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Uyanik G, Elcioglu N, Penzien J, Gross C, Yilmaz Y, Olmez A, Demir E, Wahl D, Scheglmann K, Winner B, Bogdahn U, Topaloglu H, Hehr U, Winkler J. Novel truncating and missense mutations of the KCC3 gene associated with Andermann syndrome. Neurology 2006; 66:1044-8. [PMID: 16606917 DOI: 10.1212/01.wnl.0000204181.31175.8b] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Background: Andermann syndrome (OMIM 218000) is an autosomal recessive motor-sensory neuropathy associated with developmental and neurodegenerative defects. The cerebral MRI reveals a variable degree of agenesis of the corpus callosum. Recently, truncating mutations of the KCC3 gene (also known as SLC12A6) have been associated with Andermann syndrome.Methods: The authors assessed clinically and genetically three isolated cases from Germany and Turkey with symptoms consistent with Andermann syndrome.Results: The authors detected four novel mutations within the KCC3 gene in their patients: two different truncating mutations in the first patient, a homozygous truncating mutation in the second, and a homozygous missense mutation in the third patient. In contrast to the classic phenotype of the Andermann syndrome linked to truncating KCC3 mutations the phenotype and the course of the disease linked to the missense mutation appeared to be different (i.e., showing additional features like diffuse and widespread white matter abnormalities).Conclusions: Not only truncating but also missense mutations of the KCC3 gene are associated with Andermann syndrome. Different types of KCC3 mutations may determine different clinical phenotypes.
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Olmez A, Uyanik G, Ozgül RK, Gross C, Cirak S, Elibol B, Anlar B, Winner B, Hehr U, Topaloglu H, Winkler J. Further clinical and genetic characterization of SPG11: hereditary spastic paraplegia with thin corpus callosum. Neuropediatrics 2006; 37:59-66. [PMID: 16773502 DOI: 10.1055/s-2006-923982] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
Hereditary spastic paraplegias (HSPs) are a heterogeneous group of neurodegenerative disorders leading to progressive spasticity of the lower limbs. Clinically, HSPs are divided into "pure" and "complicated" forms. In pure HSP, the spasticity of the lower limbs is the sole symptom, whereas in complicated forms additional neurological and non-neurological features are observed. Genetically, HSPs are divided into autosomal dominant (AD), autosomal recessive (AR) and X-linked (XL) forms. Up to date, 30 different HSPs are linked to different chromosomal loci and 11 genes could be defined for AR-HSP, AD-HSP and XL-HSP. SPG11, an AR-HSP (synonym: HSP11), is a complicated HSP associated with a slowly progressive spastic paraparesis, mental impairment and the development of a thin corpus callosum (TCC) during the course of the disease. SPG11 has been previously linked to chromosomal region 15q13 - 15. First, we applied rigid diagnostic criteria to systematically examine 20 Turkish families with autosomal recessive HSP for characteristic features of SPG11. We detected four large Turkish families with AR-HSP and TCC consistent with SPG11. Subsequent genetic linkage analysis of those 4 families refines the SPG11 locus further down to a small region of 2.93 cM with a maximum lod score of 11.84 at marker D15S659 and will guide further candidate gene analysis.
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D'Amico A, Haliloglu G, Richard P, Talim B, Maugenre S, Ferreiro A, Guicheney P, Menditto I, Benedetti S, Bertini E, Bonne G, Topaloglu H. Two patients with 'Dropped head syndrome' due to mutations in LMNA or SEPN1 genes. Neuromuscul Disord 2005; 15:521-4. [PMID: 15961312 DOI: 10.1016/j.nmd.2005.03.006] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2005] [Revised: 03/11/2005] [Accepted: 03/24/2005] [Indexed: 11/28/2022]
Abstract
Dropped head syndrome is characterized by severe weakness of neck extensor muscles with sparing of the flexors. It is a prominent sign in several neuromuscular conditions, but it may also be an isolated feature with uncertain aetiology. We report two children in whom prominent weakness of neck extensor muscles is associated with mutations in lamin A/C (LMNA) and selenoprotein N1 (SEPN1) genes, respectively. This report expands the underlying causes of the dropped head syndrome which may be the presenting feature of a congenital muscular dystrophy.
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Bertini E, Burghes A, Bushby K, Estournet-Mathiaud B, Finkel RS, Hughes RAC, Iannaccone ST, Melki J, Mercuri E, Muntoni F, Voit T, Reitter B, Swoboda KJ, Tiziano D, Tizzano E, Topaloglu H, Wirth B, Zerres K. 134th ENMC International Workshop: Outcome Measures and Treatment of Spinal Muscular Atrophy, 11-13 February 2005, Naarden, The Netherlands. Neuromuscul Disord 2005; 15:802-16. [PMID: 16202598 DOI: 10.1016/j.nmd.2005.07.005] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2005] [Indexed: 01/09/2023]
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67
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Demir E, Bomont P, Erdem S, Cavalier L, Demirci M, Kose G, Muftuoglu S, Cakar AN, Tan E, Aysun S, Topcu M, Guicheney P, Koenig M, Topaloglu H. Giant axonal neuropathy: clinical and genetic study in six cases. J Neurol Neurosurg Psychiatry 2005; 76:825-32. [PMID: 15897506 PMCID: PMC1739689 DOI: 10.1136/jnnp.2003.035162] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
BACKGROUND Giant axonal neuropathy (GAN) is a severe recessive disorder characterised by variable combination of progressive sensory motor neuropathy, central nervous system (CNS) involvement, and "frizzly" hair. The disease is caused by GAN gene mutations on chromosome 16q24.1. AIMS To search for GAN gene mutations in Turkish patients with GAN and characterise the phenotype associated with them. METHODS Linkage and mutation analyses were performed in six affected patients from three consanguineous families. These patients were also investigated by cranial magnetic resonance imaging (MRI) and electroencephalography (EEG). Electromyography (EMG) was performed in heterozygous carriers from family 1 and family 3. RESULTS Linkage to 16q24.1 was confirmed by haplotype analysis. GAN mutations were identified in all families. Family 1 had the R293X mutation, previously reported in another Turkish family. Families 2 and 3, originating from close geographical areas, shared a novel mutation, 1502+1G>T, at the donor splice site of exon 9. All patients displayed a common phenotype, including peripheral neuropathy, cerebellar ataxia, and frizzly hair. Cranial MRI showed diffuse white matter abnormalities in two patients from family 1 and the patient from family 3, and minimal white matter involvement in the patient from family 2. EMG of a heterozygous R293X mutation carrier showed signs of mild axonal neuropathy, whereas a 1502+1G>T mutation carrier had normal EMG. EEG abnormalities were found in three patients. CONCLUSION These findings highlight the association of CNS involvement, in particular white matter abnormalities, with peripheral neuropathy in GAN. The phenotypical consequences of both mutations (when homozygous) were similar.
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Haliloglu G, Gross C, Senbil N, Talim B, Hehr U, Uyanik G, Winkler J, Topaloglu H. Clinical spectrum of muscle-eye-brain disease: from the typical presentation to severe autistic features. ACTA MYOLOGICA : MYOPATHIES AND CARDIOMYOPATHIES : OFFICIAL JOURNAL OF THE MEDITERRANEAN SOCIETY OF MYOLOGY 2004; 23:137-9. [PMID: 15938569] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Muscle-eye-brain disease (MEB) is an autosomal recessive congenital muscular dystrophy with ocular abnormalities and type II lissencephaly. MEB is caused by mutations in the protein O-linked mannose beta1,2-N-acetylglucosaminyltransferase (POMGnT1) gene on chromosome 1q33. POMGnT1 is a glycosylation enzyme that participates in the synthesis of O-mannosyl glycan. The disease is characterized by altered glycosylation of alpha-dystroglycan. The clinical spectrum of MEB phenotype and POMGnT1 mutations are significantly expanded. We would like to present two cases with MEB disease with POMGnT1 mutations, whose clinical picture shows heterogeneity. The patient with R442H mutation had the classical form of the disease although the one with IVS17-2A-->G homozygous mutation had severe autistic features as the dominating presenting sign. These two cases represent different spectrums of one disorder. To the best of our knowledge, autistic features and stereotypical movements have not been included thus far as a part of broad and heterogeneous MEB spectrum.
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Demir E, Ferreiro A, Sabatelli P, Allamand V, Makri S, Echenne B, Maraldi M, Merlini L, Topaloglu H, Guicheney P. Collagen VI status and clinical severity in Ullrich congenital muscular dystrophy: phenotype analysis of 11 families linked to the COL6 loci. Neuropediatrics 2004; 35:103-12. [PMID: 15127309 DOI: 10.1055/s-2004-815832] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Ullrich's congenital muscular dystrophy (UCMD) is an autosomal recessive myopathy characterised by neonatal muscle weakness, proximal joint contractures and distal hyperlaxity. Mutations in the COL6A1, COL6A2 (21 q22.3) and COL6A3 (2 q37) genes, encoding the alpha 1, alpha 2 and alpha 3 chains of collagen VI, respectively, have been recently identified as responsible for UCMD in a total of 9 families. We investigated in detail the clinical and morphological phenotype of 15 UCMD patients from 11 consanguineous families showing potential linkage either to 21 q22.3 (6 families) or to 2 q37 (5 families). Collagen VI deficiency was confirmed on muscle biopsies or skin fibroblasts in 8 families. Although all patients shared a common phenotype, a great variability in severity was observed. Collagen VI deficiency in muscle or cultured fibroblasts was complete in the severe cases and partial in the milder ones, which suggests a correlation between the degree of collagen VI deficiency and the clinical severity in UCMD. No significant phenotypical differences were found between the families linked to each of the 2 loci, which confirms UCMD as a unique entity with underlying genetic heterogeneity.
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de Bernabé DBV, van Bokhoven H, van Beusekom E, Van den Akker W, Kant S, Dobyns WB, Cormand B, Currier S, Hamel B, Talim B, Topaloglu H, Brunner HG. A homozygous nonsense mutation in the fukutin gene causes a Walker-Warburg syndrome phenotype. J Med Genet 2004; 40:845-8. [PMID: 14627679 PMCID: PMC1735302 DOI: 10.1136/jmg.40.11.845] [Citation(s) in RCA: 124] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Uyanik G, Gross C, Haliloglu G, Oehl-Jaschkowitz B, Shamdeen M, Bogdahn U, Topaloglu H, Hehr U, Winkler J. Störungen der O-Glykosylierung führen zu Muskeldystrophie und Gehirnfehlbildungen. AKTUELLE NEUROLOGIE 2004. [DOI: 10.1055/s-2004-833306] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Muntoni F, Valero de Bernabe B, Bittner R, Blake D, van Bokhoven H, Brockington M, Brown S, Bushby K, Campbell KP, Fiszman M, Gruenewald S, Merlini L, Quijano-Roy S, Romero N, Sabatelli P, Sewry CA, Straub V, Talim B, Topaloglu H, Voit T, Yurchenco PD, Urtizberea JA, Wewer UM, Guicheney P. 114th ENMC International Workshop on Congenital Muscular Dystrophy (CMD) 17-19 January 2003, Naarden, The Netherlands: (8th Workshop of the International Consortium on CMD; 3rd Workshop of the MYO-CLUSTER project GENRE). Neuromuscul Disord 2003; 13:579-88. [PMID: 12921796 DOI: 10.1016/s0960-8966(03)00072-5] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Topaloglu H, Brockington M, Yuva Y, Talim B, Haliloglu G, Blake D, Torelli S, Brown SC, Muntoni F. FKRP gene mutations cause congenital muscular dystrophy, mental retardation, and cerebellar cysts. Neurology 2003; 60:988-92. [PMID: 12654965 DOI: 10.1212/01.wnl.0000052996.14099.dc] [Citation(s) in RCA: 83] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
BACKGROUND Congenital muscular dystrophies (CMD) are autosomal recessive disorders that present within the first 6 months of life with hypotonia and a dystrophic muscle biopsy. CNS involvement is present in some forms. The fukutin-related protein gene (FKRP) is mutated in a severe form of CMD (MDC1C) and a milder limb girdle dystrophy (LGMD2I). Both forms have secondary deficiencies of laminin alpha2 and alpha-dystroglycan immunostaining. Structural brain involvement has not been observed in patients with FKRP gene mutations. METHODS The authors studied two unrelated patients who had a pattern of muscle involvement identical to MDC1C, mental retardation, and cerebellar cysts on cranial MRI. The FKRP gene was analyzed along with the skeletal muscle expression of laminin alpha2 and alpha-dystroglycan. RESULTS The muscle biopsy of both patients showed severe dystrophic findings, a reduction in laminin alpha2, and profound depletion of alpha-dystroglycan. Both patients had homozygous FKRP gene mutations not previously reported (C663A [Ser221Arg] and C981A [Pro315Thr]). CONCLUSIONS Mutations within the FKRP gene can result in CMD associated with mental retardation and cerebellar cysts. This adds structural brain defects to the already wide spectrum of abnormalities caused by FKRP mutations. The severe depletion of alpha-dystroglycan expression suggests that FKRP is involved in the processing of alpha-dystroglycan.
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Nelis E, Erdem S, Van Den Bergh PYK, Belpaire-Dethiou MC, Ceuterick C, Van Gerwen V, Cuesta A, Pedrola L, Palau F, Gabreëls-Festen AAWM, Verellen C, Tan E, Demirci M, Van Broeckhoven C, De Jonghe P, Topaloglu H, Timmerman V. Mutations in GDAP1: autosomal recessive CMT with demyelination and axonopathy. Neurology 2002; 59:1865-72. [PMID: 12499475 DOI: 10.1212/01.wnl.0000036272.36047.54] [Citation(s) in RCA: 122] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
BACKGROUND Mutations in the ganglioside-induced differentiation-associated protein 1 gene (GDAP1) were recently shown to be responsible for autosomal recessive (AR) demyelinating Charcot-Marie-Tooth disease (CMT) type 4A (CMT4A) as well as AR axonal CMT with vocal cord paralysis. METHODS The coding region of GDAP1 was screened for the presence of mutations in seven families with AR CMT in which the patients were homozygous for markers of the CMT4A locus at chromosome 8q21.1. RESULTS A nonsense mutation was detected in exon 5 (c.581C>G, S194X), a 1-bp deletion in exon 6 (c.786delG, G262fsX284), and a missense mutation in exon 6 (c.844C>T, R282C). CONCLUSIONS Mutations in GDAP1 are a frequent cause of AR CMT. They result in an early-onset, severe clinical phenotype. The range of nerve conduction velocities (NCV) is variable. Some patients have normal or near normal NCV, suggesting an axonal neuropathy, whereas others have severely slowed NCV compatible with demyelination. The peripheral nerve biopsy findings are equally variable and show features of demyelination and axonal degeneration.
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Muntoni F, Bertini E, Bönnemann C, Brockington M, Brown S, Bushby K, Fiszman M, Körner C, Mercuri E, Merlini L, Hewitt J, Quijano-Roy S, Romero N, Squarzoni S, Sewry CA, Straub V, Topaloglu H, Haliloglu G, Voit T, Wewer U, Guicheney P. 98th ENMC International Workshop on Congenital Muscular Dystrophy (CMD), 7th Workshop of the International Consortium on CMD, 2nd Workshop of the MYO CLUSTER project GENRE. 26-28th October, 2001, Naarden, The Netherlands. Neuromuscul Disord 2002; 12:889-96. [PMID: 12398845 DOI: 10.1016/s0960-8966(02)00068-8] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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