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https://www.readbyqxmd.com/read/28214532/smn1-functions-as-a-novel-inhibitor-for-traf6-mediated-nf-%C3%AE%C2%BAb-signaling
#1
Eun Kyung Kim, Eui-Ju Choi
Survival motor neuron (SMN) is a 38-kDa protein, whose deficiency in humans develops spinal muscular atrophy (SMA), an autosomal recessive neurodegenerative disease with muscular atrophy due to motor neuron death in the spinal cord. We now report that SMN prevents the activation of TRAF6 and IκB kinase (IKK) and thereby negatively regulates the NF-κB signaling processes. SMN physically interacted with TRAF6 and with each component of the IKK complex, IKK-α, IKK-β, and IKK-γ in BV2 microglia cells. Moreover, SMN1 inhibited the E3 ubiquitin ligase activity of TRAF6 as well as the kinase activity of IKK...
February 15, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28202949/clinical-diversity-caused-by-novel-ighmbp2-variants
#2
Jun-Hui Yuan, Akihiro Hashiguchi, Akiko Yoshimura, Hiroshi Yaguchi, Koji Tsuzaki, Azusa Ikeda, Kenji Wada-Isoe, Masahiro Ando, Tomonori Nakamura, Yujiro Higuchi, Yu Hiramatsu, Yuji Okamoto, Hiroshi Takashima
Immunoglobulin helicase μ-binding protein 2 (IGHMBP2) gene is responsible for Charcot-Marie-Tooth disease (CMT) type 2S and spinal muscular atrophy with respiratory distress type 1 (SMARD1). From June 2014 to December 2015, we collected 408 cases, who referred to our genetic laboratory for genetic analysis, suspected with CMT disease or other inherited peripheral neuropathies (IPNs) on the basis of clinical manifestations and electrophysiological studies. Mutation screening was performed using Ion AmpliSeq Custom Panels, which comprise 72 disease-causing or candidate genes of IPNs...
February 16, 2017: Journal of Human Genetics
https://www.readbyqxmd.com/read/28199839/the-survival-of-motor-neuron-protein-acts-as-a-molecular-chaperone-for-mrnp-assembly
#3
Paul G Donlin-Asp, Claudia Fallini, Jazmin Campos, Ching-Chieh Chou, Megan E Merritt, Han C Phan, Gary J Bassell, Wilfried Rossoll
Spinal muscular atrophy (SMA) is a motor neuron disease caused by reduced levels of the survival of motor neuron (SMN) protein. SMN is part of a multiprotein complex that facilitates the assembly of spliceosomal small nuclear ribonucleoproteins (snRNPs). SMN has also been found to associate with mRNA-binding proteins, but the nature of this association was unknown. Here, we have employed a combination of biochemical and advanced imaging methods to demonstrate that SMN promotes the molecular interaction between IMP1 protein and the 3' UTR zipcode region of β-actin mRNA, leading to assembly of messenger ribonucleoprotein (mRNP) complexes that associate with the cytoskeleton to facilitate trafficking...
February 14, 2017: Cell Reports
https://www.readbyqxmd.com/read/28196890/dync1h1-mutations-associated-with-neurological-diseases-compromise-processivity-of-dynein-dynactin-cargo-adaptor-complexes
#4
Ha Thi Hoang, Max A Schlager, Andrew P Carter, Simon L Bullock
Mutations in the human DYNC1H1 gene are associated with neurological diseases. DYNC1H1 encodes the heavy chain of cytoplasmic dynein-1, a 1.4-MDa motor complex that traffics organelles, vesicles, and macromolecules toward microtubule minus ends. The effects of the DYNC1H1 mutations on dynein motility, and consequently their links to neuropathology, are not understood. Here, we address this issue using a recombinant expression system for human dynein coupled to single-molecule resolution in vitro motility assays...
February 14, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28193854/gene-activation-of-smn-by-selective-disruption-of-lncrna-mediated-recruitment-of-prc2-for-the-treatment-of-spinal-muscular-atrophy
#5
Caroline J Woo, Verena K Maier, Roshni Davey, James Brennan, Guangde Li, John Brothers, Brian Schwartz, Susana Gordo, Anne Kasper, Trevor R Okamoto, Hans E Johansson, Berhan Mandefro, Dhruv Sareen, Peter Bialek, B Nelson Chau, Balkrishen Bhat, David Bullough, James Barsoum
Spinal muscular atrophy (SMA) is a neurodegenerative disease characterized by progressive motor neuron loss and caused by mutations in SMN1 (Survival Motor Neuron 1). The disease severity inversely correlates with the copy number of SMN2, a duplicated gene that is nearly identical to SMN1. We have delineated a mechanism of transcriptional regulation in the SMN2 locus. A previously uncharacterized long noncoding RNA (lncRNA), SMN-antisense 1 (SMN-AS1), represses SMN2 expression by recruiting the Polycomb Repressive Complex 2 (PRC2) to its locus...
February 13, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28193117/exome-sequencing-identifies-de-novo-dync1h1-mutations-associated-with-distal-spinal-muscular-atrophy-and-malformations-of-cortical-development
#6
Yulin Chen, Yufei Xu, Guoqiang Li, Niu Li, Tingting Yu, Ru-En Yao, Xiumin Wang, Yiping Shen, Jian Wang
Exome sequencing has become a formidable tool for identifying potential de novo variants in causative genes of human diseases, such as neurodegenerative disorders. This article describes a 16-month-old girl with spinal muscular atrophy with lower extremity predominance and a 13-month-old girl with malformations of cortical development. Exome sequencing identified a novel de novo heterozygous missense mutation c.3395G>A (p.Gly1132Glu) and a previously reported de novo heterozygous missense mutation c.10151G>A (p...
March 2017: Journal of Child Neurology
https://www.readbyqxmd.com/read/28192393/nusinersen-an-antisense-oligonucleotide-drug-for-spinal-muscular-atrophy
#7
David R Corey
No abstract text is available yet for this article.
February 13, 2017: Nature Neuroscience
https://www.readbyqxmd.com/read/28182029/very-severe-spinal-muscular-atrophy-type-0
#8
Suleiman Al Dakhoul
This case report describes a rare phenotype of very severe spinal muscular atrophy (SMA) in a newborn who presented with reduced fetal movements in utero and significant respiratory distress at birth. The patient was homozygously deleted for exon 7 and exon 8 of the survival motor neuron gene 1. Very severe SMA should be considered in the differential diagnosis of respiratory distress at birth, and more research should be dedicated to investigate the genetic determinants of its widely variable phenotypes.
January 2017: Avicenna Journal of Medicine
https://www.readbyqxmd.com/read/28178525/single-cell-analysis-of-smn-reveals-its-broader-role-in-neuromuscular-disease
#9
Natalia Rodriguez-Muela, Nadia K Litterman, Erika M Norabuena, Jesse L Mull, Maria José Galazo, Chicheng Sun, Shi-Yan Ng, Nina R Makhortova, Andrew White, Maureen M Lynes, Wendy K Chung, Lance S Davidow, Jeffrey D Macklis, Lee L Rubin
The mechanism underlying selective motor neuron (MN) death remains an essential question in the MN disease field. The MN disease spinal muscular atrophy (SMA) is attributable to reduced levels of the ubiquitous protein SMN. Here, we report that SMN levels are widely variable in MNs within a single genetic background and that this heterogeneity is seen not only in SMA MNs but also in MNs derived from controls and amyotrophic lateral sclerosis (ALS) patients. Furthermore, cells with low SMN are more susceptible to cell death...
February 7, 2017: Cell Reports
https://www.readbyqxmd.com/read/28178250/spinal-muscular-atrophy-approval-boosts-antisense-drugs
#10
Elie Dolgin
No abstract text is available yet for this article.
February 8, 2017: Nature Biotechnology
https://www.readbyqxmd.com/read/28173138/synaptotagmin-2-and-1-linked-to-neurotransmission-impairment-and-vulnerability-in-spinal-muscular-atrophy
#11
Rocío Tejero, Mario Lopez-Manzaneda, Saravanan Arumugam, Lucía Tabares
No abstract text is available yet for this article.
November 1, 2016: Human Molecular Genetics
https://www.readbyqxmd.com/read/28172892/effect-of-genetic-background-on-the-phenotype-of-the-smn2b-mouse-model-of-spinal-muscular-atrophy
#12
Mehdi Eshraghi, Emily McFall, Sabrina Gibeault, Rashmi Kothary
No abstract text is available yet for this article.
October 15, 2016: Human Molecular Genetics
https://www.readbyqxmd.com/read/28163542/presumed-isotretinoin-induced-extraocular-myopathy
#13
Md Shahid Alam, Swati Agarwal
Isotretinoin a synthetic analogue of vitamin A is primarily used for cystic acne not responding to conventional treatment. Several ocular side effects including blurring of vision, decreased dark adaptation, corneal opacities and meibomian gland atrophy have been reported with prolonged use of isotretinoin. There have been reports of muscular damage caused by isotretinoin. Extra ocular myopathy as an adverse effect of long term used of isotretinoin has never been mentioned in literature. We report a case of a young male who presented to us with complaints of diplopia after using isotretinoin for a prolonged period...
October 2016: Journal of Pharmacology & Pharmacotherapeutics
https://www.readbyqxmd.com/read/28162243/seasonal-morphophysiological-variations-in-the-prostatic-complex-of-the-tarabul-s-gerbil-gerbillus-tarabuli
#14
Arezki Kheddache, Elara N'tima Moudilou, Yamina Zatra, Naouel Aknoun-Sail, Zaina Amirat, Jean-Marie Exbrayat, Farida Khammar
Gerbillus tarabuli is a nocturnal Saharan rodent which has an annual reproductive cycle characterized by the reproductive activity in spring and a long phase of sexual quiescence in other seasons. We describe the morphology and hormonal regulation of the prostatic complex of this rodent in the two periods, based on anatomical, histological, morphometric, and immunohistochemical analyses. The organisation of this prostatic complex is similar to that reported for Meriones unguiculatus, but different from the prostate of Psammomys obesus, the rat, and the mouse...
January 19, 2017: Tissue & Cell
https://www.readbyqxmd.com/read/28161391/spinal-muscular-atrophy-factors-that-modulate-motor-neurone-vulnerability
#15
REVIEW
Wen-Yo Tu, Julie E Simpson, J Robin Highley, Paul R Heath
Spinal muscular atrophy (SMA), a leading genetic cause of infant death, is a neurodegenerative disease characterised by the selective loss of particular groups of motor neurones in the anterior horn of the spinal cord with concomitant muscle weakness. To date, no effective treatment is available, however, there are ongoing clinical trials are in place which promise much for the future. However, there remains an ongoing problem in trying to link a single gene loss to motor neurone degeneration. Fortunately, given successful disease models that have been established and intensive studies on SMN functions in the past ten years, we are fast approaching the stage of identifying the underlying mechanisms of SMA pathogenesis Here we discuss potential disease modifying factors on motor neurone vulnerability, in the belief that these factors give insight into the pathological mechanisms of SMA and therefore possible therapeutic targets...
February 1, 2017: Neurobiology of Disease
https://www.readbyqxmd.com/read/28159932/modeling-the-differential-phenotypes-of-spinal-muscular-atrophy-with-high-yield-generation-of-motor-neurons-from-human-induced-pluripotent-stem-cells
#16
Xiang Lin, Jin-Jing Li, Wen-Jing Qian, Qi-Jie Zhang, Zhong-Feng Wang, Ying-Qian Lu, En-Lin Dong, Jin He, Ning Wang, Li-Xiang Ma, Wan-Jin Chen
Spinal muscular atrophy (SMA) is a devastating motor neuron disease caused by mutations of the survival motor neuron 1 (SMN1) gene. SMN2, a paralogous gene to SMN1, can partially compensate for the loss of SMN1. On the basis of age at onset, highest motor function and SMN2 copy numbers, childhood-onset SMA can be divided into three types (SMA I-III). An inverse correlation was observed between SMN2 copies and the differential phenotypes of SMA. Interestingly, this correlation is not always absolute. Using SMA induced pluripotent stem cells (iPSCs), we found that the SMN was significantly decreased in both SMA III and SMA I iPSCs derived postmitotic motor neurons (pMNs) and γ-aminobutyric acid (GABA) neurons...
January 31, 2017: Oncotarget
https://www.readbyqxmd.com/read/28152480/securinine-enhances-smn2-exon-7-inclusion-in-spinal-muscular-atrophy-cells
#17
Yu-Chia Chen, Jan-Gowth Chang, Ting-Yuan Liu, Yuh-Jyh Jong, Wei-Lin Cheng, Chung-Yee Yuo
Spinal muscular atrophy (SMA) is an autosomal recessive disease characterized by the degeneration of motor neurons in the spinal cord, leading to muscular atrophy. SMA is caused by deletions or mutations in the survival motor neuron gene (SMN1) on chromosome 5q13. A second copy of the SMN gene (SMN2) also exists on chromosome 5, and both genes can produce functional protein. However, due to alternative splicing of the exon 7, the majority of SMN protein produced by SMN2 is truncated and unable to compensate for the loss of SMN1...
January 30, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28145444/motor-neuron-disease-sparing-of-oligodendrocytes-in-a-mouse-model-of-spinal-muscular-atrophy
#18
Heather Wood
No abstract text is available yet for this article.
February 1, 2017: Nature Reviews. Neurology
https://www.readbyqxmd.com/read/28132687/neurocalcin-delta-suppression-protects-against-spinal-muscular-atrophy-in-humans-and-across-species-by-restoring-impaired-endocytosis
#19
Markus Riessland, Anna Kaczmarek, Svenja Schneider, Kathryn J Swoboda, Heiko Löhr, Cathleen Bradler, Vanessa Grysko, Maria Dimitriadi, Seyyedmohsen Hosseinibarkooie, Laura Torres-Benito, Miriam Peters, Aaradhita Upadhyay, Nasim Biglari, Sandra Kröber, Irmgard Hölker, Lutz Garbes, Christian Gilissen, Alexander Hoischen, Gudrun Nürnberg, Peter Nürnberg, Michael Walter, Frank Rigo, C Frank Bennett, Min Jeong Kye, Anne C Hart, Matthias Hammerschmidt, Peter Kloppenburg, Brunhilde Wirth
Homozygous SMN1 loss causes spinal muscular atrophy (SMA), the most common lethal genetic childhood motor neuron disease. SMN1 encodes SMN, a ubiquitous housekeeping protein, which makes the primarily motor neuron-specific phenotype rather unexpected. SMA-affected individuals harbor low SMN expression from one to six SMN2 copies, which is insufficient to functionally compensate for SMN1 loss. However, rarely individuals with homozygous absence of SMN1 and only three to four SMN2 copies are fully asymptomatic, suggesting protection through genetic modifier(s)...
February 2, 2017: American Journal of Human Genetics
https://www.readbyqxmd.com/read/28131694/neer-award-2016-reduced-muscle-degeneration-and-decreased-fatty-infiltration-after-rotator-cuff-tear-in-a-poly-adp-ribose-polymerase-1-parp-1-knock-out-mouse-model
#20
Michael B Kuenzler, Katja Nuss, Agnieszka Karol, Michael O Schär, Michael Hottiger, Sumit Raniga, David Kenkel, Brigitte von Rechenberg, Matthias A Zumstein
BACKGROUND: Disturbed muscular architecture, atrophy, and fatty infiltration remain irreversible in chronic rotator cuff tears even after repair. Poly (adenosine 5'-diphosphate-ribose) polymerase 1 (PARP-1) is a key regulator of inflammation, apoptosis, muscle atrophy, muscle regeneration, and adipocyte development. We hypothesized that the absence of PARP-1 would lead to a reduction in damage to the muscle subsequent to combined tenotomy and neurectomy in a PARP-1 knockout (KO) mouse model...
January 25, 2017: Journal of Shoulder and Elbow Surgery
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