NADH coenzyme Q reductase (complex I) deficiency: Heterogeneity in phenotype and biochemical findings

被引:52
作者
Pitkanen, S
Feigenbaum, A
Laframboise, R
Robinson, BH
机构
[1] HOSP SICK CHILDREN,RES INST,TORONTO,ON M5G 1X8,CANADA
[2] UNIV TORONTO,DEPT PEDIAT,TORONTO,ON,CANADA
[3] UNIV TORONTO,DEPT BIOCHEM,TORONTO,ON,CANADA
[4] UNIV LAVAL,CTR HOSP,ST FOY,PQ G1K 7P4,CANADA
关键词
D O I
10.1007/BF01799845
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
Twelve patient cell lines with biochemically proven complex I deficiency were compared for clinical presentation and outcome, together with their sensitivity to galactose and menadione toxicity. Each patient had elevated lactate to pyruvate ratios demonstrable in fibroblast cultures. Each patient also had decreased rotenone-sensitive NADH-cytochrome c reductase (complexes I and III) with normal succinate cytochrome c reductase (complexes II and III) and cytochrome oxidase (complex IV) activity in cultured skin fibroblasts, indicating a deficient NADH-coenzyme Q reductase (complex I) activity. The patients fell into five categories: severe neonatal lactic acidosis; Leigh disease; cardiomyopathy and cataracts; hepatopathy and tubulopathy; and mild symptoms with lactic acidaemia. Cell lines from 4 out of the 12 patients were susceptible to both galactose and menadione toxicity and 3 of these also displayed low levels of ATP synthesis in digitonin-permeabilized skin fibroblasts from a number of substrates. This study highlights the heterogeneity of complex I deficiency at the clinical and biochemical level.
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页码:675 / 686
页数:12
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