Abstract
A retrospective, multicenter study of 180 children with cytochrome c oxidase (COX) deficiency analyzed the clinical features, prognosis, and molecular bases of the COX deficiency. Clinical symptoms including failure to thrive, encephalopathy, hypotony, Leigh syndrome, cardiac involvement, and hepatopathy appeared in most patients early after birth or in early childhood. Two thirds of all children died. Biochemical examination revealed an isolated COX deficiency in 101 children and COX deficiency combined with disturbances of other respiratory chain complexes in 79 children. Blood and cerebrospinal fluid lactate increased in 85% and 81% of examined cases, respectively. Pathogenic mutations in mitochondrial or nuclear DNA were established in 75 patients. Mutations in surfeit locus protein 1 gene (SURF1) were found in 47 children with Leigh syndrome; 2bp deletion 845-846delCT was found in 89% of independent alleles. Mutations in a mitochondrial copper-binding protein (SCO2) gene were found in nine children with encephalomyopathy and/or cardiomyopathy; all of them were homozygotes or heterozygotes for 1541G>A mutation. Different mitochondrial DNA (mtDNA) deletion or depletion were found in nine children, mtDNA mutation 3243A>G in six, mtDNA mutation 8363G>A in two children with Leigh syndrome and mtDNA mutations 8344A>G, and 9205-9206delTA in one child each. COX deficiency represents a heterogeneous group of diseases with unfavorable prognosis. Marked prevalence of two nuclear DNA mutations (845-846delCT in the SURF1 gene and 1541G>A in the SCO2 gene) associated with COX deficiency in a Slavonic population suggests the existence of regional differences in the genetic basis of COX deficiency.
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Abbreviations
- COX:
-
cytochrome c oxidase
- CS:
-
citrate synthase
- mtDNA:
-
mitochondrial deoxyribonucleic acid
- SCO2:
-
a mitochondrial copper-binding protein
- SURF1:
-
surfeit locus protein 1
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Supported by the European Community's Sixth Framework Programme for Research, Priority 1 “Life Sciences, Genomics and Biotechnology for Health” (LSHM-CT-2004-503116), IGA NE/8065-3, GACŘ 303/03/0749, MSM 0021620806, 1M6837805002, and PERFECT GLG1-CT-2002-90358.
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Böhm, M., Pronicka, E., Karczmarewicz, E. et al. Retrospective, Multicentric Study of 180 Children with Cytochrome c Oxidase Deficiency. Pediatr Res 59, 21–26 (2006). https://doi.org/10.1203/01.pdr.0000190572.68191.13
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DOI: https://doi.org/10.1203/01.pdr.0000190572.68191.13
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