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non 5q spinal muscular atrophy

I Ivanov, D Atkinson, I Litvinenko, L Angelova, S Andonova, H Mumdjiev, I Pacheva, M Panova, R Yordanova, V Belovejdov, A Petrova, M Bosheva, T Shmilev, A Savov, A Jordanova
Pontocerebellar hypoplasia type 1 (PCH1) is a major cause of non-5q spinal muscular atrophy (SMA). We screened 128 SMN1-negative SMA patients from Bulgaria for a frequent mutation -p.G31A in EXOSC3, and performed a literature review of all genetically verified PCH1 cases. Homozygous p.G31A/EXOSC3 mutation was identified in 14 Roma patients, representing three fourths of all our SMN1-negative Roma SMA cases. The phenotype of the p.G31A/EXOSC3 homozygotes was compared to the clinical presentation of all reported to date genetically verified PCH1 cases...
April 3, 2018: European Journal of Paediatric Neurology: EJPN
Mieko Yoshioka, Naoya Morisada, Daisaku Toyoshima, Hajime Yoshimura, Hisahide Nishio, Kazumoto Iijima, Yasuhiro Takeshima, Tomoko Uehara, Kenjiro Kosaki
INTRODUCTION: The most common form of spinal muscular atrophy (SMA) is a recessive disorder caused by SMN1 mutations in 5q13, whereas the genetic etiologies of non-5q SMA are very heterogenous and largely remain to be elucidated. We present a father and son with atrophy and weakness of the lower leg muscles since infancy. Genetic studies in this family revealed a novel BICD2 mutation causing autosomal dominant lower extremity-predominant SMA type 2. PATIENTS: The proband was the father, aged 30, and the son was aged 3...
April 2018: Brain & Development
Massimiliano Filosto, Massimo Aureli, Barbara Castellotti, Fabrizio Rinaldi, Domitilla Schiumarini, Manuela Valsecchi, Susanna Lualdi, Raffaella Mazzotti, Viviana Pensato, Silvia Rota, Cinzia Gellera, Mirella Filocamo, Alessandro Padovani
ASAH1 gene encodes for acid ceramidase that is involved in the degradation of ceramide into sphingosine and free fatty acids within lysosomes. ASAH1 variants cause both the severe and early-onset Farber disease and rare cases of spinal muscular atrophy (SMA) with progressive myoclonic epilepsy (SMA-PME), phenotypically characterized by childhood onset of proximal muscle weakness and atrophy due to spinal motor neuron degeneration followed by occurrence of severe and intractable myoclonic seizures and death in the teenage years...
November 2016: European Journal of Human Genetics: EJHG
James C Dodge, Christopher M Treleaven, Joshua Pacheco, Samantha Cooper, Channa Bao, Marissa Abraham, Mandy Cromwell, S Pablo Sardi, Wei-Lien Chuang, Richard L Sidman, Seng H Cheng, Lamya S Shihabuddin
Recent genetic evidence suggests that aberrant glycosphingolipid metabolism plays an important role in several neuromuscular diseases including hereditary spastic paraplegia, hereditary sensory neuropathy type 1, and non-5q spinal muscular atrophy. Here, we investigated whether altered glycosphingolipid metabolism is a modulator of disease course in amyotrophic lateral sclerosis (ALS). Levels of ceramide, glucosylceramide, galactocerebroside, lactosylceramide, globotriaosylceramide, and the gangliosides GM3 and GM1 were significantly elevated in spinal cords of ALS patients...
June 30, 2015: Proceedings of the National Academy of Sciences of the United States of America
Kristien Peeters, Teodora Chamova, Albena Jordanova
Hereditary spinal muscular atrophy is a motor neuron disorder characterized by muscle weakness and atrophy due to degeneration of the anterior horn cells of the spinal cord. Initially, the disease was considered purely as an autosomal recessive condition caused by loss-of-function SMN1 mutations on 5q13. Recent developments in next generation sequencing technologies, however, have unveiled a growing number of clinical conditions designated as non-5q forms of spinal muscular atrophy. At present, 16 different genes and one unresolved locus are associated with proximal non-5q forms, having high phenotypic variability and diverse inheritance patterns...
November 2014: Brain: a Journal of Neurology
Xiang Lin, Qi-Jie Zhang, Jin He, Min-Ting Lin, Shen-Xing Murong, Ning Wang, Wan-Jin Chen
Spinal muscular atrophy with respiratory distress type 1 (SMARD1), a notably common form of non-5q-spinal muscular atrophy, can be confused with infantile spinal muscular atrophy and is characterized by the early onset of diaphragmatic palsy and predominantly distal muscle weakness. The defective gene, immunoglobulin mu-binding protein 2 (IGHMBP2), is located on chromosome 11q13-q21. In this study, we screened the IGHMBP2 gene in 53 unrelated Han Chinese non-5q-spinal muscular atrophy patients and 100 healthy controls...
August 2014: Journal of Child Neurology
Kristien Peeters, Ivan Litvinenko, Bob Asselbergh, Leonardo Almeida-Souza, Teodora Chamova, Thomas Geuens, Elke Ydens, Magdalena Zimoń, Joy Irobi, Els De Vriendt, Vicky De Winter, Tinne Ooms, Vincent Timmerman, Ivailo Tournev, Albena Jordanova
The most common form of spinal muscular atrophy (SMA) is a recessive disorder caused by deleterious SMN1 mutations in 5q13, whereas the genetic etiologies of non-5q SMA are very heterogeneous and largely remain to be elucidated. In a Bulgarian family affected by autosomal-dominant proximal SMA, we performed genome-wide linkage analysis and whole-exome sequencing and found a heterozygous de novo c.320C>T (p.Ser107Leu) mutation in bicaudal D homolog 2 (Drosophila) (BICD2). Further analysis of BICD2 in a cohort of 119 individuals with non-5q SMA identified a second de novo BICD2 mutation, c...
June 6, 2013: American Journal of Human Genetics
Basil T Darras
No abstract text is available yet for this article.
July 26, 2011: Neurology
N J Parkinson, D Baumer, A Rose-Morris, K Talbot
Spinal muscular atrophy (SMA) is a devastating neuromuscular disease characterised by progressive loss of spinal motor neurons. Mutations in the genes underlying spontaneous bovine and feline models of SMA have recently been described. The clinical and pathological features of these disorders are similar to human forms of SMA making both genes excellent candidates in patients with motor neuron loss of no known aetiology. Here we report that a screen for mutations in coding regions and splice sites of the LIX1 and FVT1 genes in a cohort of 96 non-5q SMA patients and 119 familial and sporadic Amyotrophic Lateral Sclerosis patients identified no obvious pathogenic changes...
May 2008: Neuromuscular Disorders: NMD
Nathalie Guillot, Jean-Marie Cuisset, Jean-Christophe Cuvellier, Jean-François Hurtevent, Sylvie Joriot, Louis Vallee
UNLABELLED: Spinal Muscular Atrophies (SMA) are a group of degenerative diseases primarily affecting the anterior horn cells of the spinal cord and resulting in muscle weakness and atrophy. Diagnostic criteria were proposed by the International SMA Consortium (ISMAC) to differentiate"classical" proximal SMA caused by homozygous deletion or conversion of the SMN1 gene (5q13) from atypical SMA unlinked to chromosome 5q (non-5q-SMA entities). The aim of our study was to emphasize the unusual clinical features encountered in infantile SMA...
March 2008: Brain & Development
Katja Grohmann, Raymonda Varon, Piroschka Stolz, Markus Schuelke, Catrin Janetzki, Enrico Bertini, Kate Bushby, Francesco Muntoni, Robert Ouvrier, Lionel Van Maldergem, Nathalie M L A Goemans, Hanns Lochmüller, Stephan Eichholz, Coleen Adams, Friedrich Bosch, Padraic Grattan-Smith, Carmen Navarro, Heidemarie Neitzel, Tilman Polster, Haluk Topaloğlu, Christina Steglich, Ulf P Guenther, Klaus Zerres, Sabine Rudnik-Schöneborn, Christoph Hübner
Autosomal recessive spinal muscular atrophy with respiratory distress type 1 (SMARD1) is the second anterior horn cell disease in infants in which the genetic defect has been defined. SMARD1 results from mutations in the gene encoding the immunoglobulin micro-binding protein 2 (IGHMBP2) on chromosome 11q13. Our aim was to review the clinical features of 29 infants affected with SMARD1 and report on 26 novel IGHMBP2 mutations. Intrauterine growth retardation, weak cry, and foot deformities were the earliest symptoms of SMARD1...
December 2003: Annals of Neurology
Klaus Zerres, Sabine Rudnik-Schöneborn
No abstract text is available yet for this article.
February 2003: Neuromuscular Disorders: NMD
C Helmken, A Wetter, S Rudnik-Schöneborn, T Liehr, K Zerres, B Wirth
The survival motor neuron (SMN) protein and the SMN interacting protein 1 (SIP1) are part of a 300 kD protein complex with a crucial role in snRNP biogenesis and pre-mRNA splicing. Both proteins are colocalised in nuclear structures called gems and in the cytoplasm. Approximately 96% of patients with autosomal recessive spinal muscular atrophy (SMA) show mutations in the SMN1 gene, while about 4% fail to show any mutation, despite a typical SMA phenotype. Additionally, sibs with identical 5q13 homologs and homozygous absence of SMN1 can show variable phenotypes which suggest that SMA is modified by other, yet unknown factors...
July 2000: European Journal of Human Genetics: EJHG
C F Rochette, L C Surh, P N Ray, P E McAndrew, T W Prior, A H Burghes, M Vanasse, L R Simard
The telomeric survival motor neuron (SMN(T)) gene is a valuable molecular diagnostic tool for childhood-onset spinal muscular atrophy (SMA) as homozygous deletions of SMN(T) exon 7 (delta7SMN(T)) are present in approximately 94% of patients. In this report, we provide the first comprehensive study of 32 unrelated non-deletion SMA patients. Quantitative polymerase chain reaction (PCR) studies established that 90% had two intact copies of SMN(T) exon 7 suggesting that these patients do not have 5q SMA. Once 5q SMA is confirmed, the SMN(T) gene can be screened for subtle mutations...
September 1997: Neurogenetics
P E McAndrew, D W Parsons, L R Simard, C Rochette, P N Ray, J R Mendell, T W Prior, A H Burghes
The survival motor neuron (SMN) transcript is encoded by two genes, SMNT and SMNC. The autosomal recessive proximal spinal muscular atrophy that maps to 5q12 is caused by mutations in the SMNT gene. The SMNT gene can be distinguished from the SMNC gene by base-pair changes in exons 7 and 8. SMNT exon 7 is not detected in approximately 95% of SMA cases due to either deletion or sequence-conversion events. Small mutations in SMNT now have been identified in some of the remaining nondeletion patients. However, there is no reliable quantitative assay for SMNT, to distinguish SMA compound heterozygotes from non-5q SMA-like cases (phenocopies) and to accurately determine carrier status...
June 1997: American Journal of Human Genetics
S Spranger, S Rudnik-Schöneborn, M Spranger, M Schächtele, K Zerres, B Wirth
We present the results of clinical and molecular genetic investigations of a family in which the father suffers from distal spinal muscular atrophy and the younger son is affected by infantile autosomal recessive SMA type I. The molecular analysis of the SMN gene showed homozygous deletions of telSMN exons 7 and 8 in the son only. This was probably the result of a new mutation in the paternal haplotype, since the affected boy did not inherit one copy of the marker Ag1-CA. These results indicate that distal and proximal SMA in this family are not caused by the same gene on chromosome 5q...
April 1997: Journal of Medical Genetics
J M Cobben, H Scheffer, M De Visser, G Van der Steege, J B Verhey, J Osinga, M Burton, R G Mensink, P M Grootscholten, L P Ten Kate, C H Buys
With the localisation of the gene for the autosomal recessive forms of proximal spinal muscular atrophies (SMA) to the chromosomal region 5q13 and the later detection of homozygous deletions of the SMN gene located in this region, prenatal prediction of SMA has become feasible and is widely applied now. In our experience with 77 prenatal predictions of SMA, follow-up of the 39 liveborn children from these pregnancies never led to a false-negative result. Application of SMN deletion analysis has consequences for prenatal prediction of SMA...
1996: European Journal of Human Genetics: EJHG
M J Francis, K E Morrison, L Campbell, P K Grewal, Z Christodoulou, R J Daniels, A P Monaco, A M Frischauf, J McPherson, J Wasmuth
We have constructed a contig of non-chimaeric yeast artificial chromosomes (YACs) across the candidate region for childhood autosomal recessive spinal muscular atrophy (SMA) in 5q13. A novel microsatellite reduces the candidate region to approximately 400kb of DNA distal to D5S435. The candidate region contains blocks of chromosome 5 specific repeats which have copies on 5p as well as elsewhere on 5q. Restriction mapping of the YACs reveals at least one CpG island in the SMA gene region. The YAC maps indicate that the contig contains minimal rearrangements or deletions...
August 1993: Human Molecular Genetics
J M Cobben, H Scheffer, M de Visser, J H Begeer, W M Molenaar, G van der Steege, C H Buys, G J van Ommen, L P Ten Kate
A proband with a clinical picture indistinguishable from SMA type I is described. The parents are second cousins. On DNA analysis it appeared that the proband and his healthy 2 year old sib had inherited the same haplotypes for DNA markers flanking the SMA locus on 5q. This supports non-linkage of SMA to chromosome 5q in this family. The consanguinity of the parents raises the possibility of a second locus for autosomal recessive SMA type I outside the 5q12-13 region. This may have implications for genetic counselling after prenatal diagnosis in consanguineous families...
March 1994: Journal of Medical Genetics
M R Whittle, M Zatz, F C Reinach
1. Five Brazilian families referred to us with a probable diagnosis of chronic proximal spinal muscular atrophy (Kugelberg-Welander) were identified, and permanent (Epstein Barr virus transformed) cell lines were established from members of four of the families. 2. A genetic linkage study was carried out on 70 individuals using nine polymorphic DNA markers (eight RFLP and one microsatellite) from chromosome 5q11.2-13.3 which have been shown to flank the spinal muscular atrophy (SMA) gene. 3. The segregation of the markers in two of the five families was compatible with the disease-causing locus being located in this same region...
November 1993: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
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