phosphofructokinase/asthenia

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Juvenile-onset permanent weakness in muscle phosphofructokinase deficiency.

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We describe a 41-year-old Moroccan woman with phosphofructokinase (PFK) deficiency who presented slowly progressive muscular weakness since childhood, without rhabdomyolysis episode or hemolytic anemia. Deltoid biopsy revealed massive glycogen storage in the majority of muscle fibers and

Late-onset muscular weakness in phosphofructokinase deficiency due to exon 5/intron 5 junction point mutation: a unique disorder or the natural course of this glycolytic disorder?

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Late-onset muscle weakness is rare in glycolytic disorders. There are two reports in the literature of phosphofructokinase (PFK)-deficient Ashkenazi Jews with severe vacuolar myopathy manifesting in late adulthood. The genetic abnormality in these patients is unknown. We report a third patient with

Late-onset muscle weakness in partial phosphofructokinase deficiency: a unique myopathy with vacuoles, abnormal mitochondria, and absence of the common exon 5/intron 5 junction point mutation.

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Three patients (ages 51, 59, and 79) from two generations of an Ashkenazi Jewish family had partial (33% activity) phosphofructokinase (PFK) deficiency that presented with fixed muscle weakness after the age of 50 years. MR spectroscopy revealed accumulation of phosphomonoesters during exercise.

[Exercise-induced muscular weakness, myalgia and contractures. II. Casuistic contribution].

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Two sisters with exercise-induced myalgias, muscular weakness and contractures are reported. Neurologic and psychiatric findings were normal, nor did electromyography, serum enzymes and ischemic forearm exercise test reveal specific findings. Under the light microscope multiple muscle fibers

Muscle phosphofructokinase deficiency: abnormal polysaccharide in a case of late-onset myopathy.

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A 61-year-old woman with muscle phosphofructokinase (PFK) deficiency had mild limb weakness all her life but no cramps or myoglobinuria. For 5 years the limb weakness progressed. In muscle, PFK activity was 1% of normal and glycogen concentration was elevated (2.13%). By light microscopy, a minor

Coexistence of diabetes and phosphofructokinase deficiency.

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OBJECTIVE To report the first case of coexisting diabetes mellitus and phosphofructokinase deficiency. METHODS We describe a 50-year-old woman who had a history of diabetes mellitus, muscle weakness, and mild hemolysis. Phosphofructokinase deficiency was diagnosed with use of the ischemic forearm

Muscle phosphofructokinase deficiency with neonatal seizures and nonprogressive course.

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Muscle phosphofructokinase deficiency is known to cause childhood-onset exercise intolerance, muscle cramps, and myoglobinuria. Rarely, phosphofructokinase deficiency manifests in infancy as congenital myopathy and arthrogryposis with fatal outcome. Here, the authors report the case of a 2-year-old

Late-onset muscle phosphofructokinase deficiency.

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A 75-year-old man had a 10-year history of slowly progressive limb weakness without cramps or myoglobinuria. Clinical, morphologic, and biochemical studies showed muscle phosphofructokinase (PFK) deficiency. Erythrocyte PFK activity in his asymptomatic daughter was 63% of normal, compatible with a

Hemolysis caused by phosphofructokinase deficiency in English springer spaniels: seven cases (1983-1986).

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Seven English Springer Spaniels (6 adult males and 1 female) with chronic hemolysis and sporadic intravascular hemolytic crises were determined to have a deficiency in erythrocyte phosphofructokinase (PFK) activity, a key regulatory enzyme of anaerobic glycolysis. Intermittent severe pigmenturia

Phosphofructokinase deficiency: recent advances in molecular biology.

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Phosphofructokinase (PFK) plays a major role in glycolysis. Deficiency of PFK-M is characterized by muscle weakness due to fuel crisis in exercising muscles. To elucidate the gene defect of PFK-deficient patients, we have cloned and determined the complete structure and transcription mechanism of

First description of phosphofructokinase deficiency in spain: identification of a novel homozygous missense mutation in the PFKM gene.

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Phosphofructokinase deficiency is a very rare autosomal recessive disorder, which belongs to group of rare inborn errors of metabolism called glycogen storage disease. Here we report on a new mutation in the phosphofructokinase (PFK) gene PFKM identified in a 65-years-old woman who suffered from

Fatal familial infantile glycogen storage disease: multisystem phosphofructokinase deficiency.

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An infant girl of consanguinous Bedouin parents suffered from fatal early onset of progressive generalized muscle weakness. Her older brother suffered from similar weakness and cardiomyopathy, which led to his death at the age of 21 months. A muscle biopsy performed on the propositus at the age of 9

Increase in glucose 1,6-bisphosphate levels, activation of phosphofructokinase and phosphoglucomutase, and inhibition of glucose 1,6-bisphosphatase in muscle induced by trifluoperazine.

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Injection of trifluoperazine (TFP) to rats induced a significant rise in the level of glucose 1,6-bisphosphate (Glc-1,6-P2) in muscle. This increase in Glc-1,6-P2, the potent activator of phosphofructokinase and phosphoglucomutase, was accompanied by a marked activation of both enzymes, when assayed

Characterization of the enzymatic defect in late-onset muscle phosphofructokinase deficiency. New subtype of glycogen storage disease type VII.

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Human phosphofructokinase (PFK) exists in tetrameric isozymic forms, at least in vitro. Muscle and liver contain homotetramers M4 and L4, respectively, whereas red cells contain five isozymes composed of M (muscle) and L (liver) type subunits, i.e., M4, M3L, M2L2, and ML3, and L4. Homozygous

Altered allosteric regulation of muscle 6-phosphofructokinase causes Tarui disease.

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Tarui disease is a glycogen storage disease (GSD VII) and characterized by exercise intolerance with muscle weakness and cramping, mild myopathy, myoglobinuria and compensated hemolysis. It is caused by mutations in the muscle 6-phosphofructokinase (Pfk). Pfk is an oligomeric, allosteric enzyme

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