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Nemaline myopathy

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https://www.readbyqxmd.com/read/28826497/klhl41-stabilizes-skeletal-muscle-sarcomeres-by-nonproteolytic-ubiquitination
#1
Andres Ramirez-Martinez, Bercin Kutluk Cenik, Svetlana Bezprozvannaya, Beibei Chen, Rhonda Bassel-Duby, Ning Liu, Eric N Olson
Maintenance of muscle function requires assembly of contractile proteins into highly organized sarcomeres. Mutations in Kelch-like protein 41 (KLHL41) cause nemaline myopathy, a fatal muscle disorder associated with sarcomere disarray. We generated KLHL41 mutant mice, which display lethal disruption of sarcomeres and aberrant expression of muscle structural and contractile proteins, mimicking the hallmarks of the human disease. We show that KLHL41 is poly-ubiquitinated and acts, at least in part, by preventing aggregation and degradation of Nebulin, an essential component of the sarcomere...
August 9, 2017: ELife
https://www.readbyqxmd.com/read/28815944/neonatal-fractures-as-a-presenting-feature-of-lmod3-associated-congenital-myopathy
#2
Megan Abbott, Mahim Jain, Rachel Pferdehirt, Yuqing Chen, Alyssa Tran, Mehmet B Duz, Mehmet Seven, Richard A Gibbs, Donna Muzny, Brendan Lee, Ronit Marom, Lindsay C Burrage
Nemaline myopathy is a rare inherited disorder characterized by weakness, hypotonia, and depressed deep tendon reflexes. It is clinically and genetically heterogeneous, with the most severe phenotype presenting as perinatal akinesia, severe muscle weakness, feeding difficulties and respiratory failure, leading to early mortality. Pathogenic variants in 12 genes, encoding components of the sarcomere or factors related to myogenesis, have been reported in patients affected with the disorder. Here, we describe an early, lethal presentation of decreased fetal movements, hypotonia, muscle weakness, and neonatal respiratory failure requiring ventilator support in three siblings from a consanguineous family...
October 2017: American Journal of Medical Genetics. Part A
https://www.readbyqxmd.com/read/28780987/clinical-and-histologic%C3%A2-findings-in-acta1-related-nemaline-myopathy-case-series-and-review-of-the-literature
#3
REVIEW
Cristiane de Araújo Martins Moreno, Osório Abath Neto, Sandra Donkervoort, Ying Hu, Umbertina Conti Reed, Acary Sousa Bulle Oliveira, Carsten Bönnemann, Edmar Zanoteli
BACKGROUND: Nemaline myopathy is a rare congenital disease of skeletal muscle characterized by muscle weakness and hypotonia, as well as the diagnostic presence of nemaline rods in skeletal muscle fibers. Nemaline myopathy is genetically and phenotypically heterogeneous and, so far, mutations in 11 different genes have been associated with this disease. Dominant mutations in ACTA1 are the second most frequent genetic cause of nemaline myopathy and can lead to a variety of clinical and histologic phenotypes...
April 7, 2017: Pediatric Neurology
https://www.readbyqxmd.com/read/28678037/sporadic-late-onset-nemaline-myopathy-with-monoclonal-gammopathy-of-undetermined-significance
#4
Akinori Uruha, Olivier Benveniste
PURPOSE OF REVIEW: Sporadic late-onset nemaline myopathy (SLONM) with monoclonal gammopathy of undetermined significance (MGUS) is a rare subacute progressive muscle disease. The prognosis is poor due to severe respiratory insufficiency. Recently, however, autologous stem-cell transplantation following high-dose melphalan has been shown to be effective unless there is delay before the treatment. Therefore, early recognition of the disease is important. This review gives an overview of recent advances in SLONM-MGUS, which could help to understand clinical and pathological features and treatment...
October 2017: Current Opinion in Neurology
https://www.readbyqxmd.com/read/28606402/clinical-histological-and-radiological-responses-to-methylprednisolone-in-hiv-associated-rod-myopathy
#5
André M S Silva, Rodrigo H Mendonça, Cristiane A M Moreno, Eduardo P Estephan, Paulo V P Helito, Mary S Carvalho, Edmar Zanoteli
Skeletal muscle involvement as a neurologic manifestation in individuals with HIV is rare, especially as rod myopathy. We describe a 41-year-old male with HIV infection who presented progressive proximal muscle weakness and limb-girdle atrophy. A muscle magnetic resonance image showed bilateral fatty infiltration and post-contrast enhancement in the arm and thigh muscles. The muscle biopsy revealed intracytoplasmic aggregates with appearance of nemaline rod bodies with Gomori trichrome staining and electron microscopy in most fibers...
May 12, 2017: Neuromuscular Disorders: NMD
https://www.readbyqxmd.com/read/28606401/monoclonal-gammopathy-with-both-nemaline-myopathy-and-amyloid-myopathy
#6
Min Wang, Lin Lei, Hai Chen, Li Di, Mi Pang, Yan Lu, Lu Lu, Xin-Ming Shen, Yuwei Da
Monoclonal gammopathies due to plasma cell dyscrasias can induce diverse rare neuromuscular disorders. Deposition of monoclonal antibody light chains in skeletal muscle causes amyloid myopathy. Monoclonal gammopathy is occasionally associated with sporadic late-onset nemaline myopathy. Here we report a monoclonal gammopathy patient with both sporadic late-onset nemaline myopathy and amyloid myopathy. The diagnoses were based on immunofixation electrophoresis of urine, and serum for free light chain assay, Congo red staining and Thioflavin S staining of muscle biopsies, as well as immunohistochemical staining and electron-microscopic observation...
May 11, 2017: Neuromuscular Disorders: NMD
https://www.readbyqxmd.com/read/28606400/autosomal-dominant-distal-myopathy-due-to-a-novel-acta1-mutation
#7
Teerin Liewluck, Eric J Sorenson, Magdalena A Walkiewicz, Kandelaria M Rumilla, Margherita Milone
Mutations in skeletal muscle α-actin 1-encoding gene (ACTA1) cause autosomal dominant or recessive myopathies with marked clinical and pathological heterogeneity. Patients typically develop generalized or limb-girdle pattern of weakness, but recently a family with scapuloperoneal myopathy was reported. We describe a father and 2 children with childhood-to-juvenile onset distal myopathy, carrying a novel dominant ACTA1 variant, c.757G>C (p.Gly253Arg). Father had delayed motor development and developed significant proximal weakness later in life; he was initially misdiagnosed as having spinal muscular atrophy based on electromyographic findings...
May 5, 2017: Neuromuscular Disorders: NMD
https://www.readbyqxmd.com/read/28494946/tropomodulins-and-leiomodins-actin-pointed-end-caps-and-nucleators-in-muscles
#8
REVIEW
Velia M Fowler, Roberto Dominguez
Cytoskeletal structures characterized by actin filaments with uniform lengths, including the thin filaments of striated muscles and the spectrin-based membrane skeleton, use barbed and pointed-end capping proteins to control subunit addition/dissociation at filament ends. While several proteins cap the barbed end, tropomodulins (Tmods), a family of four closely related isoforms in vertebrates, are the only proteins known to specifically cap the pointed end. Tmods are ∼350 amino acids in length, and comprise alternating tropomyosin- and actin-binding sites (TMBS1, ABS1, TMBS2, and ABS2)...
May 9, 2017: Biophysical Journal
https://www.readbyqxmd.com/read/28490364/sporadic-late-onset-nemaline-myopathy-clinico-pathological-characteristics-and-review-of-76-cases
#9
REVIEW
Lukas J Schnitzler, Tobias Schreckenbach, Aleksandra Nadaj-Pakleza, Werner Stenzel, Elisabeth J Rushing, Philip Van Damme, Andreas Ferbert, Susanne Petri, Christian Hartmann, Antje Bornemann, Andreas Meisel, Jens A Petersen, Thomas Tousseyn, Dietmar R Thal, Jens Reimann, Peter De Jonghe, Jean-Jacques Martin, Peter Y Van den Bergh, Jörg B Schulz, Joachim Weis, Kristl G Claeys
BACKGROUND: Sporadic late-onset nemaline myopathy (SLONM) is a rare, late-onset muscle disorder, characterized by the presence of nemaline rods in muscle fibers. Phenotypic characterization in a large cohort and a comprehensive overview of SLONM are lacking. METHODS: We studied the clinico-pathological features, treatment and outcome in a large cohort of 76 patients with SLONM, comprising 10 new patients and 66 cases derived from a literature meta-analysis (PubMed, 1966-2016), and compared these with 15 reported HIV-associated nemaline myopathy (HIV-NM) cases...
May 11, 2017: Orphanet Journal of Rare Diseases
https://www.readbyqxmd.com/read/28468212/craniofacial-manifestations-in-severe-nemaline-myopathy
#10
Yunfeng Xue, Pilar L Magoulas, John O Wirthlin, Edward P Buchanan
Nemaline myopathy (NM) is a rare congenital muscular disease characterized by the presence of rod (nemaline) bodies visualized on muscle biopsy. The disease is genetically and clinically heterogeneous, and the age of onset can vary from neonate to adult. Patients typically present initially with diffuse muscle weakness and hypotonia. The disease also afflicts facial musculature and can cause anomalous facial growth and development. The authors report a patient of early onset NM with significant craniofacial abnormalities...
May 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28436394/sarcomere-dysfunction-in-nemaline-myopathy
#11
Josine M de Winter, Coen A C Ottenheijm
Nemaline myopathy (NM) is among the most common non-dystrophic congenital myopathies (incidence 1:50.000). Hallmark features of NM are skeletal muscle weakness and the presence of nemaline bodies in the muscle fiber. The clinical phenotype of NM patients is quite diverse, ranging from neonatal death to normal lifespan with almost normal motor function. As the respiratory muscles are involved as well, severely affected patients are ventilator-dependent. The mechanisms underlying muscle weakness in NM are currently poorly understood...
2017: Journal of Neuromuscular Diseases
https://www.readbyqxmd.com/read/28416349/cytoplasmic-body-pathology-in-severe-acta1-related-myopathy-in-the-absence-of-typical-nemaline-rods
#12
Sandra Donkervoort, Sophelia H S Chan, Leslie H Hayes, Nathaniel Bradley, David Nguyen, Meganne E Leach, Payam Mohassel, Ying Hu, Mathula Thangarajh, Diana Bharucha-Goebel, Amanda Kan, Ronnie S L Ho, Christine A Reyes, Jessica Nance, Steven A Moore, A Reghan Foley, Carsten G Bönnemann
Mutations in ACTA1 cause a group of myopathies with expanding clinical and histopathological heterogeneity. We describe three patients with severe ACTA1-related myopathy who have muscle fiber cytoplasmic bodies but no classic nemaline rods. Patient 1 is a five-year-old boy who presented at birth with severe weakness and respiratory failure, requiring mechanical ventilation. Whole exome sequencing identified a heterozygous c.282C>A (p.Asn94Lys) ACTA1 mutation. Patients 2 and 3 were twin boys with hypotonia, severe weakness, and respiratory insufficiency at birth requiring mechanical ventilation...
March 2, 2017: Neuromuscular Disorders: NMD
https://www.readbyqxmd.com/read/28357410/phenotypes-genotypes-and-prevalence-of-congenital-myopathies-older-than-5-years-in-denmark
#13
Nanna Witting, Ulla Werlauff, Morten Duno, John Vissing
OBJECTIVE: Congenital myopathy as a nosologic entity has long been recognized, but knowledge of overall and subtype prevalence and phenotype-genotype relationship is scarce, especially in the adult population. METHODS: A national cohort of 107 patients ≥5 years diagnosed with congenital myopathy were prospectively assessed clinically, histologically, and genetically. RESULTS: Twenty-five patients were excluded because of atypical features or alternative etiologies...
April 2017: Neurology. Genetics
https://www.readbyqxmd.com/read/28337097/neuromuscular-disease-mimicking-myasthenia-gravis-in-a-nigerian-female-adolescent-could-this-be-nemaline-rod-disease
#14
O A Oyinlade, I A Lagunju, B E Adebayo
BACKGROUND: Nemaline rod disease is a congenital myopathy, presentation of which may mimic myasthenia gravis. METHOD: We report a suspected case of nemaline rod disease in a female adolescent who presented with features similar to myasthenia gravis but failed to respond effectively to its conventional management. She had features of respiratory failure and cardiomyopathy. RESULTS: Patient had a turbulent clinical course and finally succumbed to illness on the fifth day of admission...
December 2016: Annals of Ibadan Postgraduate Medicine
https://www.readbyqxmd.com/read/28268051/distal-myopathy-with-adssl1-mutations-in-korean-patients
#15
Hyung Jun Park, Ha Young Shin, Sungjun Kim, Se Hoon Kim, Yunbeom Lee, Jung Hwan Lee, Ji-Man Hong, Seung Min Kim, Kee Duk Park, Byung-Ok Choi, Ji Hyun Lee, Young-Chul Choi
To understand the characteristics of ADSSL1 myopathy, we investigated the clinical manifestation in Korean patients with ADSSL1 mutations. We developed a targeted panel of 16 distal-myopathy genes and recruited a total of 12 patients with genetically undetermined distal myopathy. We found four (33%) with ADSSL1 mutations and one (8%) with GNE mutations. ADSSL1 mutations consisted of c.910G>A, c.1048delA and c.1220T>C mutations. Patients with ADSSL1 mutations demonstrated distal muscle weakness in adolescence, followed by quadriceps muscle weakness in the early 30s...
May 2017: Neuromuscular Disorders: NMD
https://www.readbyqxmd.com/read/28256693/-communication-and-language-problems-in-children-with-nemaline-myopathy
#16
J F Cervera-Merida, I Villa-Garcia, A Ygual-Fernandez
INTRODUCTION: Nemaline myopathy is a rare disease with an incidence of 1 in every 50,000 live births. It is the most prevalent of the congenital myopathies, a heterogeneous set of neuromuscular disorders present at birth or manifesting at a very early age, which affect the skeletal muscles and give rise to weakness, hypotonia and psychomotor retardation, although cognitive development remains normal. AIM: To review the studies conducted to date on the communication difficulties and dysphagia of children with nemaline myopathy and their possible management based on speech therapy...
February 24, 2017: Revista de Neurologia
https://www.readbyqxmd.com/read/28220527/recessive-mypn-mutations-cause-cap-myopathy-with-occasional-nemaline-rods
#17
Xavière Lornage, Edoardo Malfatti, Chrystel Chéraud, Raphaël Schneider, Valérie Biancalana, Jean-Marie Cuisset, Matteo Garibaldi, Bruno Eymard, Michel Fardeau, Anne Boland, Jean-François Deleuze, Julie Thompson, Robert-Yves Carlier, Johann Böhm, Norma B Romero, Jocelyn Laporte
Congenital myopathies are phenotypically and genetically heterogeneous. We describe homozygous truncating mutations in MYPN in 2 unrelated families with a slowly progressive congenital cap myopathy. MYPN encodes the Z-line protein myopalladin implicated in sarcomere integrity. Functional experiments demonstrate that the mutations lead to mRNA defects and to a strong reduction in full-length protein expression. Myopalladin signals accumulate in the caps together with alpha-actinin. Dominant MYPN mutations were previously reported in cardiomyopathies...
March 2017: Annals of Neurology
https://www.readbyqxmd.com/read/28182120/sagging-eye-syndrome-or-nemaline-rod-myopathy-divergence-insufficiency-with-levator-dehiscence-as-an-overlapping-symptom-between-two-diagnoses
#18
Stephanie S L Cheung, Larissa K Ghadiali, Thomas H Brannagan Iii, Gul Moonis, Phyllis L Faust, Jeffrey G Odel
A 78-year-old woman complained of gradual, painless onset of horizontal binocular diplopia associated with progressive axial weakness. Physical examination revealed esotropia that was greater at distance than at near vision, bilateral levator dehiscence, and normal abducting saccadic speeds. Given the age of the patient and compatible clinical findings, the diagnosis of Sagging Eye Syndrome (SES) was made. However, further work-up with a muscle biopsy suggested Sporadic Late-Onset Nemaline Myopathy (SLONM) as the cause of her progressive muscle weakness...
2017: Case Reports in Ophthalmological Medicine
https://www.readbyqxmd.com/read/28134641/craniofacial-manifestations-in-severe-nemaline-myopathy
#19
Yunfeng Xue, Pilar L Magoulas, John O Wirthlin, Edward P Buchanan
Nemaline myopathy (NM) is a rare congenital muscular disease characterized by the presence of rod (nemaline) bodies visualized on muscle biopsy. The disease is genetically and clinically heterogeneous, and the age of onset can vary from neonate to adult. Patients typically present initially with diffuse muscle weakness and hypotonia. The disease also afflicts facial musculature and can cause anomalous facial growth and development. The authors report a patient of early onset NM with significant craniofacial abnormalities...
January 27, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28017374/biallelic-mutations-in-mypn-encoding-myopalladin-are-associated-with-childhood-onset-slowly-progressive-nemaline-myopathy
#20
Satoko Miyatake, Satomi Mitsuhashi, Yukiko K Hayashi, Enkhsaikhan Purevjav, Atsuko Nishikawa, Eriko Koshimizu, Mikiya Suzuki, Kana Yatabe, Yuzo Tanaka, Katsuhisa Ogata, Satoshi Kuru, Masaaki Shiina, Yoshinori Tsurusaki, Mitsuko Nakashima, Takeshi Mizuguchi, Noriko Miyake, Hirotomo Saitsu, Kazuhiro Ogata, Mitsuru Kawai, Jeffrey Towbin, Ikuya Nonaka, Ichizo Nishino, Naomichi Matsumoto
Nemaline myopathy (NM) is a common form of congenital nondystrophic skeletal muscle disease characterized by muscular weakness of proximal dominance, hypotonia, and respiratory insufficiency but typically not cardiac dysfunction. Wide variation in severity has been reported. Intranuclear rod myopathy is a subtype of NM in which rod-like bodies are seen in the nucleus, and it often manifests as a severe phenotype. Although ten mutant genes are currently known to be associated with NM, only ACTA1 is associated with intranuclear rod myopathy...
January 5, 2017: American Journal of Human Genetics
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