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J Inherit Metab Dis. 2012 Jan;35(1):125-31. doi: 10.1007/s10545-011-9348-y. Epub 2011 May 24.

Combined OXPHOS complex I and IV defect, due to mutated complex I assembly factor C20ORF7.

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Monique and Jacques Roboh Department of Genetic Research, Hadassah, Hebrew University Medical Center, POB 1200, 91120 Jerusalem, Israel.


Defects of the mitochondrial oxidative phosphorylation (OXPHOS) system are frequent causes of neurological disorders in children. Linkage analysis and DNA sequencing identified a new founder p.G250V substitution in the C20ORF7 complex I chaperone in five Ashkenazi Jewish patients from two families with a combined OXPHOS complex I and IV defect presenting with Leigh's syndrome in infancy. Complementation with the wild type gene restored complex I, but only partially complex IV activity. Although the pathogenic mechanism remains elusive, a C20ORF7 defect should be considered not only in isolated complex I deficiency, but also in combination with decreased complex IV. Given the significant 1:290 carrier rate for the p.G250V mutation among Ashkenazi Jews, this mutation should be screened in all Ashkenazi patients with Leigh's syndrome prior to muscle biopsy.

[Indexed for MEDLINE]

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