Journal article

OXA1L mutations cause mitochondrial encephalopathy and a combined oxidative phosphorylation defect.

Kyle Thompson, Nicole Mai, Monika Oláhová, Filippo Scialó, Luke E Formosa, David A Stroud, Madeleine Garrett, Nichola Z Lax, Fiona M Robertson, Cristina Jou, Andres Nascimento, Carlos Ortez, Cecilia Jimenez-Mallebrera, Steven A Hardy, Langping He, Garry K Brown, Paula Marttinen, Robert McFarland, Alberto Sanz, Brendan J Battersby Show all

EMBO Mol Med | Published : 2018


OXA1, the mitochondrial member of the YidC/Alb3/Oxa1 membrane protein insertase family, is required for the assembly of oxidative phosphorylation complexes IV and V in yeast. However, depletion of human OXA1 (OXA1L) was previously reported to impair assembly of complexes I and V only. We report a patient presenting with severe encephalopathy, hypotonia and developmental delay who died at 5 years showing complex IV deficiency in skeletal muscle. Whole exome sequencing identified biallelic OXA1L variants (c.500_507dup, p.(Ser170Glnfs*18) and c.620G>T, p.(Cys207Phe)) that segregated with disease. Patient muscle and fibroblasts showed decreased OXA1L and subunits of complexes IV and V. Crucially..

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