Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0026850 (muscular dystrophy)
 5,870 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Fukuyama-type congenital muscular dystrophy (FCMD), Walker-Warburg syndrome (WWS), and muscle-eye-brain (MEB) disease are clinically similar autosomal recessive disorders characterized by congenital muscular dystrophy, cobblestone lissencephaly, and eye anomalies. Among them, WWS is the most severe syndrome. Causative genes for FCMD (Fukutin), WWS (POMT1), and MEB (POMGnT1) have been identified. The vast majority of Japanese FCMD patients carry at least one copy of an ancestral founder insertion mutation. Patients homozygous for this insertion show a milder phenotype than do compound heterozygotes, carrying the insertion in combination with a missense or nonsense mutation on the other allele. No Japanese FCMD patients have been identified with nonfounder mutations on both alleles. A Turkish boy with characteristics of WWS was detected to have a homozygous nonsense mutation in exon 5 of Fukutin. This is the first case worldwide in which a Fukutin mutation has been found outside the Japanese population. Later, another Turkish boy with WWS phenotype was found to have a homozygous nonsense mutation in exon 4 of Fukutin. These two Turkish boys represent the most severe end of the phenotypic spectrum of Fukutin mutations. The Japanese FCMD patients carrying at least one copy of a founder mutation in the noncoding region may produce a lower level of mature Fukutin than normal and generate a relatively mild FCMD phenotype. The homozygous nonsense mutations within the coding region identified in Turkish patients are predicted to cause a total loss of fukutin activity and are likely to produce a more severe phenotype which closely resembles WWS.
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PMID:Phenotypic spectrum of Fukutinopathy: most severe phenotype of Fukutinopathy. 1883 83

Hypoglycosylation and reduced laminin-binding activity of alpha-dystroglycan are common characteristics of dystroglycanopathy, which is a group of congenital and limb-girdle muscular dystrophies. Fukuyama-type congenital muscular dystrophy (FCMD), caused by a mutation in the fukutin gene, is a severe form of dystroglycanopathy. A retrotransposal insertion in fukutin is seen in almost all cases of FCMD. To better understand the molecular pathogenesis of dystroglycanopathies and to explore therapeutic strategies, we generated knock-in mice carrying the retrotransposal insertion in the mouse fukutin ortholog. Knock-in mice exhibited hypoglycosylated alpha-dystroglycan; however, no signs of muscular dystrophy were observed. More sensitive methods detected minor levels of intact alpha-dystroglycan, and solid-phase assays determined laminin binding levels to be approximately 50% of normal. In contrast, intact alpha-dystroglycan is undetectable in the dystrophic Large(myd) mouse, and laminin-binding activity is markedly reduced. These data indicate that a small amount of intact alpha-dystroglycan is sufficient to maintain muscle cell integrity in knock-in mice, suggesting that the treatment of dystroglycanopathies might not require the full recovery of glycosylation. To examine whether glycosylation defects can be restored in vivo, we performed mouse gene transfer experiments. Transfer of fukutin into knock-in mice restored glycosylation of alpha-dystroglycan. In addition, transfer of LARGE produced laminin-binding forms of alpha-dystroglycan in both knock-in mice and the POMGnT1 mutant mouse, which is another model of dystroglycanopathy. Overall, these data suggest that even partial restoration of alpha-dystroglycan glycosylation and laminin-binding activity by replacing or augmenting glycosylation-related genes might effectively deter dystroglycanopathy progression and thus provide therapeutic benefits.
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PMID:Residual laminin-binding activity and enhanced dystroglycan glycosylation by LARGE in novel model mice to dystroglycanopathy. 1901 26

In the last few years, muscular dystrophies due to reduced glycosylation of alpha-dystroglycan (ADG) have emerged as a common group of conditions, now referred to as dystroglycanopathies. Mutations in six genes (POMT1, POMT2, POMGnT1, Fukutin, FKRP and LARGE) have so far been identified in patients with a dystroglycanopathy. Allelic mutations in each of these genes can result in a wide spectrum of clinical conditions, ranging from severe congenital onset with associated structural brain malformations (Walker Warburg syndrome; muscle-eye-brain disease; Fukuyama muscular dystrophy; congenital muscular dystrophy type 1D) to a relatively milder congenital variant with no brain involvement (congenital muscular dystrophy type 1C), and to limb-girdle muscular dystrophy (LGMD) type 2 variants with onset in childhood or adult life (LGMD2I, LGMD2L, and LGMD2N). ADG is a peripheral membrane protein that undergoes multiple and complex glycosylation steps to regulate its ability to effectively interact with extracellular matrix proteins, such as laminin, agrin, and perlecan. Although the precise composition of the glycans present on ADG are not known, it has been demonstrated that the forced overexpression of LARGE, or its paralog LARGE2, is capable of increasing the glycosylation of ADG in normal cells. In addition, its overexpression is capable of restoring dystroglycan glycosylation and laminin binding properties in primary cell cultures of patients affected by different genetically defined dystroglycanopathy variants. These observations suggest that there could be a role for therapeutic strategies to overcome the glycosylation defect in these conditions via the overexpression of LARGE.
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PMID:Muscular dystrophies due to glycosylation defects. 1901 16

Fukuyama congenital muscular dystrophy (FCMD) is frequent in Japan, due to a founder mutation of the fukutin gene (FKTN). Outside Japan, FKTN mutations have only been reported in a few patients with a wide spectrum of phenotypes from Walker-Warburg syndrome to limb-girdle muscular dystrophy (LGMD2M). We studied four new Caucasian patients from three unrelated families. All showed raised serum CK initially isolated in one case and muscular dystrophy. Immunohistochemical studies and haplotype analysis led us to search for mutations in FKTN. Two patients (two sisters) presented with congenital muscular dystrophy, mental retardation, and posterior fossa malformation including cysts, and brain atrophy at Brain MRI. The other two patients had normal intelligence and brain MRI. Sequencing of the FKTN gene identified three previously described mutations and two novel missense mutations. Outside Japan, fukutinopathies are associated with a large spectrum of phenotypes from isolated hyperCKaemia to severe CMD, showing a clear overlap with that of FKRP.
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PMID:Four Caucasian patients with mutations in the fukutin gene and variable clinical phenotype. 1917 78

This article presents a comprehensive review of large and highly diverse superfamily of nucleotidyltransferase fold proteins by providing a global picture about their evolutionary history, sequence-structure diversity and fulfilled functional roles. Using top-of-the-line homology detection method combined with transitive searches and fold recognition, we revised the realm of these superfamily in numerous databases of catalogued protein families and structures, and identified 10 new families of nucleotidyltransferase fold. These families include hundreds of previously uncharacterized and various poorly annotated proteins such as Fukutin/LICD, NFAT, FAM46, Mab-21 and NRAP. Some of these proteins seem to play novel important roles, not observed before for this superfamily, such as regulation of gene expression or choline incorporation into cell membrane. Importantly, within newly detected families we identified 25 novel superfamily members in human genome. Among these newly assigned members are proteins known to be involved in congenital muscular dystrophy, neurological diseases and retinal pigmentosa what sheds some new light on the molecular background of these genetic disorders. Twelve of new human nucleotidyltransferase fold proteins belong to Mab-21 family known to be involved in organogenesis and development. The determination of specific biological functions of these newly detected proteins remains a challenging task.
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PMID:Comprehensive classification of nucleotidyltransferase fold proteins: identification of novel families and their representatives in human. 1983 6

Fukuyama-type congenital muscular dystrophy (FCMD) is an autosomal recessive disorder, characterized by severe muscular dystrophy associated with brain malformation. FCMD is the second most common form of muscular dystrophy and one of the most common autosomal recessive diseases among the Japanese population; however, no typical FCMD cases have been reported in any other population. In this study, we report on the first identification of a Chinese FCMD patient; our findings are supported by clinical, histological, and magnetic resonance imaging (MRI) evidence, as well as fukutin gene mutational analyses. The patient presented with neonatal hypotonia, seizures, and delayed motor and speech development. Additional testing revealed cerebral and cerebellar gyrus abnormalities with white matter signal intensity changes, elevated serum creatine kinase (CK) levels, and dystrophic skeletal muscle with alpha-dystroglycan hypoglycosylation, and normal beta-dystroglycan and merosin expression. Genetic analysis of the fukutin gene showed one copy with a Japanese founder 3-kilobase (kb) retrotransposal insertion in the 3'-non-coding region and the other copy with a known c.139C>T mutation. This is the first FCMD case reported in the Chinese population and the first case in which the 3-kb insertion has been found outside of the Japanese population. This report emphasizes the importance of considering the fukutin founder mutation for diagnostic purposes outside of Japan.
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PMID:Fukutin gene retrotransposal insertion in a non-Japanese Fukuyama congenital muscular dystrophy (FCMD) patient. 1984 1

The Fukuyama type congenital muscular dystrophy (FCMD) is a rare autosomal recessive disorder characterized by cranial, cerebellar and ocular malformations and congenital muscular dystrophy. Hyperekplexia is characterized by transient, generalized rigidity in response to unexpected loud noises or sudden tactile stimulation. Herein, we report an infant who had typical clinical features of FCMD with hyperekplexia. Our purpose is to draw attention to this first report of concomitant FCMD and hyperekplexia.
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PMID:Hyperekplexia in a neonate: a novel finding in Fukuyama type congenital muscular dystrophy. 1985 35

Various muscular dystrophies are associated with the defective glycosylation of alpha-dystroglycan and are known to result from mutations in genes encoding glycosyltransferases. Fukutin-related protein (FKRP) was identified as a homolog of fukutin, the defective protein in Fukuyama-type congenital muscular dystrophy (FCMD), that is thought to function as a glycosyltransferase. Mutations in FKRP have been linked to a variety of phenotypes including Walker-Warburg syndrome (WWS), limb girdle muscular dystrophy (LGMD) 2I and congenital muscular dystrophy 1C (MDC1C). Zebrafish are a useful animal model to reveal the mechanism of these diseases caused by mutations in FKRP gene. Downregulating FKRP expression in zebrafish by two different morpholinos resulted in embryos which had developmental defects similar to those observed in human muscular dystrophies associated with mutations in FKRP. The FKRP morphants showed phenotypes involving alterations in somitic structure and muscle fiber organization, as well as defects in developing eye morphology. Additionally, they were found to have a reduction in alpha-dystroglycan glycosylation and a shortened myofiber length. Moreover, co-injection of fish or human FKRP mRNA along with the morpholino restored normal development, alpha-dystroglycan glycosylation and laminin binding activity of alpha-dystroglycan in the morphants. Co-injection of the human FKRP mRNA containing causative mutations found in human patients of WWS, MDC1C and LGMD2I could not restore their phenotypes significantly. Interestingly, these morphant fish having human FKRP mutations showed a wide phenotypic range similar to that seen in humans.
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PMID:Zebrafish models for human FKRP muscular dystrophies. 1995 19

Fukuyama type congenital muscular dystrophy (FCMD) is an autosomal recessive disease, exhibiting muscular dystrophy, and central nervous system (CNS) and ocular malformations. It is included in alpha-dystroglycanopathy, a group of muscular dystrophy showing reduced glycosylation of alpha-dystroglycan. alpha-Dystroglycan is one of the components of dystrophin-glycoprotein complex linking extracellular and intracellular proteins. The sugar chains of alpha-dystroglycan are receptors for extracellular matrix proteins such as laminin. Fukutin, a gene responsible for FCMD, is presumably related to the glycosylation of alpha-dystroglycan like other causative genes of alpha-dystroglycanopathy. The CNS lesion of FCMD is characterized by cobblestone lissencephaly, associated with decreased glycosylation of alpha-dystroglycan in the glia limitans where the basement membrane is formed. Astrocytes whose endfeet form the glia limitans seem to be greatly involved in the genesis of the CNS lesion. Fukutin is probably necessary for astrocytic function. Other components of the CNS may also need fukutin, such as migration and synaptic function in neurons. However, roles of fukutin in oligodendroglia, microglia, leptomeninges and capillaries are unknown at present. Fukutin is expressed in various somatic organs as well, and appears to work differently between epithelial cells and astrocytes. In the molecular level, since the dystrophin-glycoprotein complex is linked to cell signaling pathways involving c-src and c-jun, fukutin may be able to affect cell proliferation/survival. Fukutin was localized in the nucleus on cancer cell lines. With the consideration that mutations of fukutin give rise to wide spectrum of the clinical phenotype, more unknown functions of fukutin besides the glycosylation of alpha-dystroglycan can be suggested. Trials for novel treatments including gene therapy are in progress in muscular dystrophies. Toward effective therapies with minimal side effects, precise evaluation of the pathomechanism of FCMD and the function of fukutin would be required.
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PMID:Functions of fukutin, a gene responsible for Fukuyama type congenital muscular dystrophy, in neuromuscular system and other somatic organs. 2051 31

Fukuyama-type congenital muscular dystrophy (FCMD) is characterized by congenital muscular dystrophy and associated with neuropathological anomalies. However, the issue of whether the radiological findings of white-matter lesions represent delayed myelination, demyelination or other problems remains controversial. We present serial radiological findings, including MR spectroscopy (MRS), in a child with FCMD. These findings indicate a correlation between the imaging abnormalities and the choline/creatine ratio, suggesting the possible usefulness of MRS in addition to MRI for following FCMD patients.
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PMID:Developmental changes of radiological findings in Fukuyama-type congenital muscular dystrophy. 2057 91


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