Biochemical and molecular analysis of cytochrome c oxidase deficiency in Leigh's syndrome.

Abstract:

:We studied three patients with Leigh's syndrome (LS) and cytochrome c oxidase (COX) deficiency. Biochemical studies in brain, muscle, heart, liver, kidney, and fibroblasts disclosed a generalized COX deficiency. Kinetic studies of COX activity in brain mitochondria showed a low Vmax and a normal Km for reduced cytochrome c. Immunologic studies showed decrease of all COX subunits studied, without a specific defect of any one of them. Southern blot analysis excluded large deletions of mitochondrial DNA (mtDNA) but revealed a generalized increase in mtDNA quantity. Although Northern blot analysis showed no alteration in the 12 COX subunit mRNAs studied, two of three patients showed a decreased steady state rate of COX transcription in brain. COX deficiency in LS thus appears to be related to a decreased amount of otherwise normal COX holoenzyme.

journal_name

Neurology

journal_title

Neurology

authors

Lombes A,Nakase H,Tritschler HJ,Kadenbach B,Bonilla E,DeVivo DC,Schon EA,DiMauro S

doi

10.1212/wnl.41.4.491

subject

Has Abstract

pub_date

1991-04-01 00:00:00

pages

491-8

issue

4

eissn

0028-3878

issn

1526-632X

journal_volume

41

pub_type

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