Gene/Protein Disease Symptom Drug Enzyme Compound
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We report a 46-year-old female who presented progressive ophthalmoplegia and limb weakness. She was well until the age of 15 years when there was an onset of bilateral deafness. She became completely deaf by 20 years of age. She noted an onset of weakness in her legs when she was 27-years-old and of ptosis at 34 years of age. She was admitted to our hospital when she was 41-years-old. Neurological examination revealed near total ophthalmoplegia, bilateral ptosis, dysphagia, generalized muscle atrophy and weakness of approximately 4/5 degree, facial grimacing, athetotic movements in four limbs. Laboratory examinations revealed increase in blood lactate and pyruvate levels and diffuse low density change in the cerebral white matter in CT scans. She was thought to have a mitochondrial encephalomyopathy. She was discharged for follow-up, but her clinical course was that of a relentless deterioration. She was readmitted to our service in December 1989. She showed further progress in her weakness and muscle atrophy. Otherwise neurological examination was essentially similar to the previous one. Her cranial CT scans showed low density changes in striatum, thalamus and midbrain in addition to the white matter. Enzyme activities of the electron transport complexes revealed a moderate decrease in the succinatecytochrome c reductase activity, and the Southern blot analysis of mtDNA revealed multiple deletions in mitochondrial genomes. Two months after her admission, she developed bronchopneumonia, and expired on March 13th, 1990. Post-mortem examination revealed diffuse pallor of myeline in the cerebral white matter in K-B staining. A marked neuronal loss and gliosis were observed in putamen bilaterally. Skeletal muscles showed typical changes of mitochondrial myopathies with ragged-red fibers in Gomori-Trichrome staining, and crystalline inclusion bodies by electron microscopic observations. Some neurogenic atrophies were also seen. Oculomotor nuclei appeared intact. It was thought that she had an incomplete form of Kearns-Sayre syndrome. The patient was discussed in a neurological CPC of the departments of Neurology and Pathology of Juntendo University School of Medicine.
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PMID:[Forty-six-year-old woman with progressive external ophthalmoplegia and limb weakness]. 847 58

The RSH/Smith-Lemli-Opitz syndrome (RSH/SLOS) is an autosomal recessive multiple congenital anomaly/mental retardation syndrome caused by an inborn error of cholesterol biosynthesis. The RSH/SLOS phenotypic spectrum is broad; however, typical features include microcephaly, ptosis, a small upturned nose, micrognathia, postaxial polydactaly, second and third toe syndactaly, genital anomalies, growth failure, and mental retardation. RSH/SLOS is due to a deficiency of the 3beta-hydroxysterol Delta(7)-reductase, which catalyzes the reduction of 7-dehydrocholesterol (7-DHC) to cholesterol. This inborn error of cholesterol biosynthesis results in elevated serum and tissue 7-DHC levels. The 3beta-hydroxysterol Delta(7)-reductase gene (DHCR7) maps to chromosome 11q12-13, and to date 66 different mutations of this gene have been identified in RSH/SLOS patients. Identification of the biochemical basis of RSH/SLOS has led to development of therapeutic regimens based on dietary cholesterol supplementation and has increased our understanding of the role cholesterol plays during embryonic development.
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PMID:RSH/Smith-Lemli-Opitz syndrome: a multiple congenital anomaly/mental retardation syndrome due to an inborn error of cholesterol biosynthesis. 1100 7

Smith-Lemli-Opitz syndrome (SLOS) is an autosomal recessive disorder of cholesterol biosynthesis. It is caused by mutations in the gene encoding the enzyme 7-dehydrocholesterol Delta7-reductase (DHCR7), which catalyzes the final step in cholesterol biosynthesis, usually resulting in cholesterol deficiency. We report a 3.5-year-old girl who has cognition in the low average range and normal behavior, but in whom molecular studies identified two missense mutations in DHCR7: V326L and F284L. She was born at term following an uncomplicated pregnancy and delivery, and presented at 12 days of age with poor feeding, abdominal distention, and jaundice. Colonic biopsy was consistent with Hirschsprung disease. On physical examination she had mild ptosis, a long philtrum, mild micrognathia, a short, upturned nose, and subtle 2,3 syndactyly. Her 7-dehydrocholesterol (7-DHC) level was markedly elevated at 8.7 mg/dl (normal 0.10 +/- 0.05), and her cholesterol level was normal at 61 mg/dl (normal for newborn period 50-80 mg/dl). Karyotype analysis was normal, 46,XX. Breast milk feeding was initiated and continued for 18 months. Cholesterol supplementation was implemented at 100 mg/kg/day at 3 months, which resulted in increased cholesterol levels and reduced dehydrocholesterol levels. Neuropsychological testing has shown functioning in the low average range, between the 14th and 18th centiles when compared to peers. This is markedly higher than most children with SLOS. She has no behavioral problems. MRI and MRS testing of the brain revealed no structural abnormalities. This is in contrast to a recently reported case by Prasad et al. [2002: Am J Med Genet 108:64-68] with a mild phenotype, behavioral problems, and abnormal MRI, who is compound heterozygote for both a null and missense mutation. Our case suggests that patients with severe feeding disorders with or without Hirschprung disease and postnatal onset microcephaly may warrant screening for SLOS.
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PMID:Normal cognition and behavior in a Smith-Lemli-Opitz syndrome patient who presented with Hirschsprung disease. 1455 55

Pelvic and perineal striated muscles are relevant for reproduction and micturition in female mammals. Damage to these muscles is associated with pelvic organ prolapse and stress urinary incontinence. The fiber type composition of skeletal muscle influences the susceptibility for damage and/or regeneration. The aim of the present study was to determine the fiber type composition of a perineal muscle, the bulbospongiosus, and a pelvic muscle, the pubococcygeus. Both muscles were harvested from adult female rabbits (8-10 months old). NADH-TR (nicotinamide adenine dinucleotide tetrazolium reductase) histochemistry was undertaken to identify oxidative and glycolytic muscle fibers. Alkaline (pH 9.4) ATP-ase (actomyosin adenosine triphosphatase) histochemistry was used to classify type I, type IIb or type IIa/IId muscle fibers. Results showed that the content of glycolytic fibers in the bulbospongiosus muscle was higher than that of oxidative fibers. Meanwhile, the opposite was true for the pubococcygeus. In the bulbospongiosus muscle, the content of type IIb muscle fibers was higher than that of type I, but was similar to that of type IIa/IId. In contrast, the content of each fiber type was similar in the pubococcygeus muscle. The relative proportion of fibers in bulbospongiosus and pubococcygeus muscles is consistent with their function during voiding and storage phases of micturition.
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PMID:Fiber type characterization of striated muscles related to micturition in female rabbits. 2423 Nov 56