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)

A rare case of progressive bilateral ptosis with dysphagia in a 70-year-old man is presented. There were similar symptoms in other members of the family. The patient was diagnosed as having oculopharyngeal muscular dystrophy, a rare autosomal dominant disorder involving progressive muscular dystrophy, one of the chronic external ophthalmoplegic syndromes. There had been slowly progressive bilateral ptosis and there was almost no levator palpebra muscular activity left, resulting in extreme head tilt. A sling suspension operation for the ptotic lids, using autogenous fascia lata, was successful. Oculopharyngeal muscular dystrophy is essentially a myogenic disorder. Affected muscles are usually those of the pharynx, causing dysphagia, and the levator palpebra muscles. Rarely are other skeletal muscles involved. The sling operation gives direct support to the dystrophic malfunctioning levator muscles by using the frontalis muscles to raise the ptotic lids, thus improving visual ability.
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PMID:[Oculopharyngeal muscular dystrophy]. 238 59

Oculopharyngeal muscular dystrophy is a localized or restricted variety of muscular dystrophy, characterized by bilateral ptosis, myopathic facies, external ophthalmoplegia and dysphagia. A patient with this unusual myopathy is described and detailed esophageal motility studies are presented that provide conclusive evidence of both striated and smooth muscle involvement.Because these unusual localized forms of muscular dystrophy exist and may be of late onset, previous rigid concepts concerning the dystrophies should be discarded.
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PMID:Late-onset muscle dystrophy: oculopharyngoesophageal variety. 594 Mar 25

Oculopharyngeal muscular dystrophy (OPMD) is a late-onset autosomal dominant muscular dystrophy which presents typically after the age of 50 with progressive eyelid drooping and an increasing difficulty in swallowing. Though OPMD has a world-wide incidence, it is more common in the French Canadian population. We have identified a homogeneous group of families and studied 166 polymorphic markers as part of a genome search before establishing linkage to chromosome 14. We determined that the OPMD locus maps to a less than 5 cM region of chromosome 14q11.2-q13. The maximum two-point lod score in three French Canadian families of 14.73 (theta = 0.03) was obtained for an intronic cardiac beta myosin heavy chain gene (MYH7) marker. The regional localization for the OPMD locus raises the intriguing possibility that either the cardiac alpha or beta myosin heavy chain genes may play a role in this disease.
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PMID:The oculopharyngeal muscular dystrophy locus maps to the region of the cardiac alpha and beta myosin heavy chain genes on chromosome 14q11.2-q13. 779 98

Oculopharyngeal muscular dystrophy (OPMD) is a late onset autosomal dominant muscular dystrophy with a high prevalence in the French Canadian population. We report linkage analysis with 7 chromosome 14q polymorphic markers in 11 large French Canadian families. An observed recombination in one family establishes D14S283 as the new centromeric flanking marker, therefore reducing the previously reported candidate interval from 5cM to 2cM. The highest two-point LOD score was 26.05 at theta = 0.01 for MYH7.1. Multipoint analysis suggested that the OPMD genes lies within a 1.5cM region around D14S990. This study of large French Canadian families underlines the great power of this population to fine map disease genes.
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PMID:Using the full power of linkage analysis in 11 French Canadian families to fine map the oculopharyngeal muscular dystrophy gene. 939 20

Oculopharyngeal muscular dystrophy (OPMD) is a late adult onset, autosomal dominant muscular dystrophy characterized by ptosis and dysphagia. The OPMD gene has been localized to chromosome 14q11.2-q13 in French-Canadian pedigrees. We report 2 non-French-Canadian families with OPMD. Affected ancestors were immigrants to the United States from Italy and Normandy. The Norman pedigree does not share the French-Canadian haplotype. OPMD appears to be a heterogeneous disorder with similar phenotypes, but probably with different gene loci.
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PMID:Oculopharyngeal muscular dystrophy: non-French-Canadian pedigrees. 958 41

Oculopharyngeal muscular dystrophy (OPMD) is an autosomal dominant muscular dystrophy characterized by late onset ptosis, proximal muscle weakness and swallowing difficulties. This disease has been recently linked to chromosome 14q11.2-q13 in French-Canadian pedigrees. We studied three unrelated American families with OPMD of Hispanic descent and our results indicate that in this ethnic group, this disease also maps to chromosome 14q11.2-q13 (marker MYH7.24; Zmax = 3.98; theta max = 0). These results represent an independent demonstration of disease linkage in a second distinct ethnic group. Furthermore, our analysis demonstrates a unique haplotype that is shared by affected individuals from all three families suggesting a founder effect for OPMD in this population. Meiotic recombinants and radiation hybrid mapping permit the narrowing of the critical region to 1 Mb which will facilitate positional cloning of the OPMD disease gene.
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PMID:Genetic mapping and haplotype analysis of oculopharyngeal muscular dystrophy. 960 50

Oculopharyngeal muscular dystrophy (OPMD) is a late-onset autosomal dominant muscular dystrophy that results from small expansions of a polyalanine tract in the PABPN1 gene. Intranuclear inclusions are the pathological hallmark of OPMD. The mechanism by which protein aggregation in OPMD might relate to a toxic gain-of-function has so far remained elusive. Whether protein aggregates themselves are pathogenic or are the consequence of an unidentified underlying molecular mechanism is still unclear. Here, we report that protein aggregation in a cell model of OPMD directly impaires the function of the ubiquitin-proteasome pathway (UPP) as well as molecular chaperone functions. The proteasome inhibitor lactacystin causes significant increase of protein aggregation and toxicity. Moreover, overexpression of molecular chaperones (HSP40 and HSP70) suppressed protein aggregation and toxicity. We also provide evidence that mPABPN1-ala17 protein aggregation proportionally correlates with toxicity. Furthermore, we show that co-expression of chaperones in our OPMD cell model increases the solubility of mPABPN1-ala17 and transfected cell survival rate. Our studies suggest that molecular regulators of polyalanine protein solubility and degradation may provide insights into new mechanisms in OPMD pathogenesis. Further analysis of the cellular and molecular mechanisms by which UPP and molecular chaperones influence the degradation of misfolded proteins could provide novel concepts and targets for the treatment and understanding of the pathogenesis of OPMD and neurodegenerative diseases.
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PMID:Involvement of the ubiquitin-proteasome pathway and molecular chaperones in oculopharyngeal muscular dystrophy. 1294 20

The dominant oculo-pharyngeal muscular dystrophy mutation consists of an expanded (GCN)(12-17) in the coding region of the PolyA Binding Protein Nuclear 1 gene. A founder effect has been demonstrated in Canadian and Bukhara Jewish populations with relatively high prevalence of this disease. Since the oculo-pharyngeal muscular dystrophy prevalence was remarkably high in Southern Uruguay, a founder effect was hypothesized. To identify the ancestral haplotype we determined the (GCN) repeat number and the variants of four intragenic SNPs in Uruguayan OPMD families and a control sample. All families carrying the mutation (GCG)(11)(GCA)(3)(GCG) shared a common ancestral haplotype and the age of the mutation was estimated in 37-53 generations by a composite likelihood method. One family carrying the (GCG)(9)(GCA)(3)(GCG) allele had a different haplotype. The genealogical and molecular data suggested that the common ancestors were Canary Islands' settlers that arrived in Uruguay in the XIX century.
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PMID:(GCG)11 founder mutation in the PABPN1 gene of OPMD Uruguayan families. 1569 41

Oculopharyngeal muscular dystrophy (OPMD) is an autosomal dominant form of late-onset muscular dystrophy. Ptosis (droopy eyelids) and dysphagia (difficulty swallowing) are the most common presenting symptoms. The purpose of this phenomenological study was to describe the experience of living with OPMD. Purposeful sampling was used to recruit individuals with genetically confirmed OPMD who displayed ptosis and dysphagia, were 40 years or older, English speaking, and were willing to consent to the tape-recording of the interviews. An unstructured interview format was used to solicit the participants' perspectives of living with droopy eyelids, difficulty swallowing, and a genetic disorder. The interviews were audiotaped and transcribed verbatim. Colaizzi's Method was used to analyze the data, which identified five comprehensive themes. The themes that emerged describing the experience of living with OPMD were "Adjusting to Change", "Managing Misconceptions", "Seeking Normality", "Facing the Future", and "Informing Children". The information derived from this study will assist nurses to identify the burdens of living with OPMD and to intervene appropriately early in the course of the disease.
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PMID:Living with oculopharyngeal muscular dystrophy: a phenomenological study. 1843 80

Trinucleotide repeat expansions have been associated with many neurodegenerative diseases, developmental disorders and muscular dystrophies. Among those triplet repeat expansions, polyalanine tract elongations are associated with early developmental abnormalities with the exception of OPMD, a late onset muscular dystrophy. This review presents an overview of recent advances on the molecular mechanisms underlying the group of polyalanine diseases and provides insights into the pathological impact of polyalanine tract expansion on protein dysfunction. While hydrophobic polyalanine tracts in the normal range are considered to be flexible spacers that confer stability and flexibility to the protein three-dimensional conformation, expanded polyalanine repeats are thought to destabilize the native conformation of the protein and alter protein levels and activity. Protein dysfunction following polyalanine expansion has been reported to cause transcriptional dysregulation which may delay early developmental processes or induce cytotoxicity in polyalanine disease models.
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PMID:Molecular mechanisms underlying polyalanine diseases. 1926 23


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