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Josef Finsterer, Sinda Zarrouk-Mahjoub
No abstract text is available yet for this article.
September 28, 2016: International Journal of Cardiology
Anthony Blaeser, Hiroyuki Awano, Bo Wu, Qi-Long Lu
Mutations in the gene for fukutin-related protein represent a subset of muscular dystrophies known as dystroglycanopathies characterized by loss of functionally-glycosylated-alpha-dystroglycan and a wide range of dystrophic phenotypes. Mice generated by our lab containing the P448L mutation in the fukutin-related protein gene demonstrate the dystrophic phenotype similar to that of LGMD2I. Here we examined the morphology of the heart and diaphragm, focusing on pathology of diaphragm and cardiac function of the mutant mice for up to 12 months...
2016: PloS One
Joseph W Maricelli, Qi L Lu, David C Lin, Buel D Rodgers
Limb-girdle muscular dystrophy type 2i (LGMD2i) affects thousands of lives with shortened life expectancy mainly due to cardiac and respiratory problems and difficulty with ambulation significantly compromising quality of life. Limited studies have noted impaired gait in patients and animal models of different muscular dystrophies, but not in animal models of LGMD2i. Our goal, therefore, was to quantify gait metrics in the fukutin-related protein P448L mutant (P448L) mouse, a recently developed model for LGMD2i...
2016: PloS One
Eisuke Amiya, Hiroyuki Morita, Masaru Hatano, Daisuke Nitta, Yumiko Hosoya, Hisataka Maki, Yoshihiro Motozawa, Naoko Sato, Hiroyuki Ishiura, Satoe Numakura, Yukako Shintani, Koichiro Kinugawa, Norifumi Takeda, Jun Shimizu, Shoji Tsuji, Issei Komuro
No abstract text is available yet for this article.
November 1, 2016: International Journal of Cardiology
Elizabeth Keramaris, Pei J Lu, Jason Tucker, Qi L Lu
INTRODUCTION: Mutations in the Fukutin related protein (FKRP) gene are characterized by a lack of functionally glycosylated α-dystroglycan (F-α-DG) in muscles. A small number of fibers retain the capacity to produce strong IIH6 reactive glycosylated-α-DG (g-α-DG) in muscles of both FKRP mutant animals and patients. METHODS: We examined the expression of g-α-DG in limb, diaphragm, and cardiac muscles of newborn FKRP mutants and LARGE(myd) mice with IIH6 antibody...
August 12, 2016: Muscle & Nerve
Naoyuki Kuwabara, Hiroshi Manya, Takeyuki Yamada, Hiroaki Tateno, Motoi Kanagawa, Kazuhiro Kobayashi, Keiko Akasaka-Manya, Yuriko Hirose, Mamoru Mizuno, Mitsunori Ikeguchi, Tatsushi Toda, Jun Hirabayashi, Toshiya Senda, Tamao Endo, Ryuichi Kato
The dystrophin glycoprotein complex, which connects the cell membrane to the basement membrane, is essential for a variety of biological events, including maintenance of muscle integrity. An O-mannose-type GalNAc-β1,3-GlcNAc-β1,4-(phosphate-6)-Man structure of α-dystroglycan (α-DG), a subunit of the complex that is anchored to the cell membrane, interacts directly with laminin in the basement membrane. Reduced glycosylation of α-DG is linked to some types of inherited muscular dystrophy; consistent with this relationship, many disease-related mutations have been detected in genes involved in O-mannosyl glycan synthesis...
August 16, 2016: Proceedings of the National Academy of Sciences of the United States of America
Xiaona Fu, Haipo Yang, Cuijie Wei, Hui Jiao, Shuo Wang, Yanling Yang, Chunxi Han, Xiru Wu, Hui Xiong
Mutations in the fukutin-related protein (FKRP) gene have been associated with dystroglycanopathies, which are common in Europe but rare in Asia. Our study aimed to retrospectively analyze and characterize the clinical, myopathological and genetic features of 12 Chinese patients with FKRP mutations. Three patients were diagnosed with congenital muscular dystrophy type 1C (MDC1C) and nine patients were diagnosed with limb girdle muscular dystrophy type 2I (LGMD2I). Three muscle biopsy specimens had dystrophic changes and reduced glycosylated α-dystroglycan staining, and two showed reduced expression of laminin α2...
July 21, 2016: Journal of Human Genetics
Steven J Foltz, Junna Luan, Jarrod A Call, Ankit Patel, Kristen B Peissig, Marisa J Fortunato, Aaron M Beedle
BACKGROUND: Secondary dystroglycanopathies are a subset of muscular dystrophy caused by abnormal glycosylation of α-dystroglycan (αDG). Loss of αDG functional glycosylation prevents it from binding to laminin and other extracellular matrix receptors, causing muscular dystrophy. Mutations in a number of genes, including FKTN (fukutin), disrupt αDG glycosylation. METHODS: We analyzed conditional Fktn knockout (Fktn KO) muscle for levels of mTOR signaling pathway proteins by Western blot...
2016: Skeletal Muscle
Isabelle Gerin, Benoît Ury, Isabelle Breloy, Céline Bouchet-Seraphin, Jennifer Bolsée, Mathias Halbout, Julie Graff, Didier Vertommen, Giulio G Muccioli, Nathalie Seta, Jean-Marie Cuisset, Ivana Dabaj, Susana Quijano-Roy, Ammi Grahn, Emile Van Schaftingen, Guido T Bommer
Mutations in genes required for the glycosylation of α-dystroglycan lead to muscle and brain diseases known as dystroglycanopathies. However, the precise structure and biogenesis of the assembled glycan are not completely understood. Here we report that three enzymes mutated in dystroglycanopathies can collaborate to attach ribitol phosphate onto α-dystroglycan. Specifically, we demonstrate that isoprenoid synthase domain-containing protein (ISPD) synthesizes CDP-ribitol, present in muscle, and that both recombinant fukutin (FKTN) and fukutin-related protein (FKRP) can transfer a ribitol phosphate group from CDP-ribitol to α-dystroglycan...
2016: Nature Communications
Inna Inashkina, Eriks Jankevics, Janis Stavusis, Inta Vasiljeva, Kristine Viksne, Ieva Micule, Jurgis Strautmanis, Maruta S Naudina, Loreta Cimbalistiene, Vaidutis Kucinskas, Astrida Krumina, Algirdas Utkus, Birute Burnyte, Ausra Matuleviciene, Baiba Lace
BACKGROUND: Limb-girdle muscular dystrophies are characterized by predominant involvement of the shoulder and pelvic girdle and trunk muscle groups. Currently, there are 31 genes implicated in the different forms of limb-girdle muscular dystrophies, which exhibit similar phenotypes and clinical overlap; therefore, advanced molecular techniques are required to achieve differential diagnosis. METHODS: We investigated 26 patients from Latvia and 34 patients from Lithuania with clinical symptoms of limb-girdle muscular dystrophies, along with 565 healthy unrelated controls from general and ethnic populations using our developed test kit based on the Illumina VeraCode GoldenGate genotyping platform, Ion AmpliSeq Inherited Disease Panel and direct sequencing of mutations in calpain 3 (CAPN3), anoctamin 5 (ANO5) and fukutin related protein (FKRP) genes...
2016: BMC Musculoskeletal Disorders
Bo Wu, Sapana N Shah, Peijuan Lu, Stephanie M Richardson, Lauren E Bollinger, Anthony Blaeser, Kyle L Madden, Yubo Sun, Taylor M Luckie, Michael D Cox, Susan Sparks, Amy D Harper, Qi Long Lu
Fukutin-related protein-muscular dystrophy is characterized by defects in glycosylation of α-dystroglycan with variable clinical phenotypes, most commonly as limb-girdle muscular dystrophy 2I. There is no effective therapy available. Glucocorticoid steroids have become the standard treatment for Duchenne and other muscular dystrophies with serious adverse effects, including excessive weight gain, immune suppression, and bone loss. Bisphosphonates have been used to treat Duchenne muscular dystrophy for prevention of osteoporosis...
June 2016: American Journal of Pathology
Motoi Kanagawa, Kazuhiro Kobayashi, Michiko Tajiri, Hiroshi Manya, Atsushi Kuga, Yoshiki Yamaguchi, Keiko Akasaka-Manya, Jun-ichi Furukawa, Mamoru Mizuno, Hiroko Kawakami, Yasuro Shinohara, Yoshinao Wada, Tamao Endo, Tatsushi Toda
Glycosylation is an essential post-translational modification that underlies many biological processes and diseases. α-dystroglycan (α-DG) is a receptor for matrix and synaptic proteins that causes muscular dystrophy and lissencephaly upon its abnormal glycosylation (α-dystroglycanopathies). Here we identify the glycan unit ribitol 5-phosphate (Rbo5P), a phosphoric ester of pentose alcohol, in α-DG. Rbo5P forms a tandem repeat and functions as a scaffold for the formation of the ligand-binding moiety. We show that enzyme activities of three major α-dystroglycanopathy-causing proteins are involved in the synthesis of tandem Rbo5P...
March 8, 2016: Cell Reports
Keiko Ishigaki
Fukuyama congenital muscular dystrophy (FCMD), the second most common muscular dystrophy in the Japanese population, is an autosomal recessive disorder caused by mutations in the fukutin (FKTN) gene. The main features of FCMD are a combination of infantile-onset hypotonia, generalized muscle weakness, eye abnormalities and central nervous system involvement with mental retardation and seizures associated with cortical migration defects. The FKTN gene product is thought to be necessary for maintaining migrating neurons in an immature state during migration, and for supporting migration via α-dystroglycan in the central nervous system...
February 2016: Brain and Nerve, Shinkei Kenkyū No Shinpo
Rajat Lahoria, Margherita Milone
BACKGROUND: Rhabdomyolysis is a potentially life threatening condition of various etiology. The association between rhabdomyolysis and muscular dystrophies is under-recognized in clinical practice. OBJECTIVE: To identify muscular dystrophies presenting with rhabdomyolysis at onset or as predominant feature. METHODS: We retrospectively reviewed clinical and laboratory data of patients with a genetically confirmed muscular dystrophy in whom rhabdomyolysis was the presenting or main clinical manifestation...
February 15, 2016: Journal of the Neurological Sciences
J Svahn, N Streichenberger, O Benveniste, R Menassa, L Michel, H Fayolle, P Petiot
Necrotizing myopathies can be encountered in various conditions as acquired myopathies (toxic or autoimmune) or muscular dystrophies. We report a twenty-year-old Caucasian woman who presented with clinical findings suggestive of an inflammatory myopathy: subacute onset of lower limb muscle weakness, myalgia, weight loss and absence of family history. The serum creatine kinase level was elevated at 4738 IU/L (normal range, 25-175 IU/L). Muscle biopsy was consistent with necrotizing myopathy. The patient showed significant clinical improvement following corticosteroid, azathioprine and intravenous immunoglobulin treatments...
November 2015: Neuromuscular Disorders: NMD
Takatoshi Sato, Terumi Murakami, Kumiko Ishiguro, Minobu Shichiji, Kayoko Saito, Makiko Osawa, Satoru Nagata, Keiko Ishigaki
BACKGROUND: Fukuyama congenital muscular dystrophy (FCMD), characterized by intellectual impairment associated with cortical migration defects, is an autosomal recessive disorder caused by mutation in the fukutin gene. It is the second most common type of muscular dystrophy in Japan. Respiratory dysfunction, along with cardiomyopathy, can be life-threatening in patients with advanced-stage FCMD. However, few reports have focused on this issue. METHODS: We retrospectively studied respiratory dysfunction and therapeutic management in 48 genetically diagnosed FCMD patients (mean age 11...
March 2016: Brain & Development
Tatsushi Toda
Fukuyama congenital muscular dystrophy(FCMD) is a second common childhood muscular dystrophy in Japan. All FCMD patients have ancestral insertion of the SVA retrotransposal element into fukutin. We show that aberrant mRNA splicing induced by SVA exon-trapping caused FCMD. Introduction of 3 cocktailed antisense oligonucleotides(AONs) targeting around these splice sites prevented pathogenic splicing in FCMD patient cells and model mice, and normalized protein production and functions of Fukutin as well as O-glycosylation of α-dystroglycan...
August 2015: Nihon Rinsho. Japanese Journal of Clinical Medicine
Htoo Zarni Oo, Kazuhiro Sentani, Shoichiro Mukai, Takuya Hattori, Shunsuke Shinmei, Keisuke Goto, Naoya Sakamoto, Yutaka Naito, Katsuhiro Anami, Pharm Thi Binh Trang, Kazuyoshi Yanagihara, Naohide Oue, Wataru Yasui
BACKGROUND: Gastric cancer (GC) is the fifth commonest malignancy worldwide and still one of the leading causes of cancer-related death. The aim of this study was to identify a novel prognostic marker or therapeutic target for GC. METHODS: We analyzed candidate genes from our previous Escherichia coli ampicillin secretion trap (CAST) libraries in detail, and focused on the FKTN gene because it was overexpressed in both GC cell line CAST libraries, MKN-1 and MKN-45...
April 2016: Gastric Cancer
Hiroyuki Awano, Anthony Blaeser, Elizabeth Keramaris, Lei Xu, Jason Tucker, Bo Wu, Pei Lu, Qi L Lu
Mutations in fukutin-related protein (FKRP) gene are characterized with lack of functionally glycosylated α-dystroglycan (F-α-DG). Surprisingly, a few muscle fibers express strong F-α-DG. Herein, we investigated the restoration of F-α-DG in the FKRP mutant muscles and showed that the restoration of glycosylation is associated with muscle regeneration and dependent on the expression of both like-glycosyltransferase (LARGE) and partially functional FKRP. F-α-DG in the regenerating fibers reaches up to normal levels and lasts for >4 weeks, but no up-regulation of the LARGE and FKRP is detected during the regeneration process...
July 2015: American Journal of Pathology
Haipo Yang, Kazuhiro Kobayashi, Shuo Wang, Hui Jiao, Jiangxi Xiao, Tatsushi Toda, Xiru Wu, Hui Xiong
PURPOSE: Fukuyama congenital muscular dystrophy (FCMD) is a congenital muscular dystrophy rarely reported outside Japan. Here, we report three patients with Fukuyama congenital muscular dystrophy (FCMD) in China who shared a similar clinical phenotype and 3-kb insertion in the FKTN 3' untranslated region. METHODS: Immunofluorescence staining was undertaken on muscle biopsies from three patients using alpha dystroglycan antibody (IIH6). Genomic DNA from patients and parents was extracted from peripheral blood leukocytes...
October 2015: Brain & Development
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