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Wintjes LTM, Kava M, van den Brandt FA, van den Brand MAM, Lapina O, Bliksrud YT, Kulseth MA, Amundsen SS, Selberg TR, Ybema-Antoine M, Tutakhel OAZ, Greed L, Thorburn DR, Tangeraas T, Balasubramaniam S, Rodenburg RJT. A novel variant in COX16 causes cytochrome c oxidase deficiency, severe fatal neonatal lactic acidosis, encephalopathy, cardiomyopathy, and liver dysfunction. Hum Mutat 2020; 42:135-141. [PMID: 33169484 PMCID: PMC7898715 DOI: 10.1002/humu.24137] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2020] [Revised: 10/26/2020] [Accepted: 11/02/2020] [Indexed: 01/28/2023]
Abstract
COX16 is involved in the biogenesis of cytochrome-c-oxidase (complex IV), the terminal complex of the mitochondrial respiratory chain. We present the first report of two unrelated patients with the homozygous nonsense variant c.244C>T(p. Arg82*) in COX16 with hypertrophic cardiomyopathy, encephalopathy and severe fatal lactic acidosis, and isolated complex IV deficiency. The absence of COX16 protein expression leads to a complete loss of the holo-complex IV, as detected by Western blot in patient fibroblasts. Lentiviral transduction of patient fibroblasts with wild-type COX16 complementary DNA rescued complex IV biosynthesis. We hypothesize that COX16 could play a role in the copper delivery route of the COX2 module as part of the complex IV assembly. Our data provide clear evidence for the pathogenicity of the COX16 variant as a cause for the observed clinical features and the isolated complex IV deficiency in these two patients and that COX16 deficiency is a cause for mitochondrial disease.
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Affiliation(s)
- Liesbeth T M Wintjes
- Department of Laboratory Medicine, Translational Metabolic Laboratory, Radboud Centre for Mitochondrial Medicine, Radboudumc, Nijmegen, The Netherlands
| | - Maina Kava
- Department of Neurology, Perth Children's Hospital, Perth, Western Australia, Australia.,School of Pediatrics and Child Health, University of Western Australia, Perth, Western Australia, Australia
| | - Frans A van den Brandt
- Department of Laboratory Medicine, Translational Metabolic Laboratory, Radboud Centre for Mitochondrial Medicine, Radboudumc, Nijmegen, The Netherlands
| | - Mariël A M van den Brand
- Department of Pediatrics, Radboud Centre for Mitochondrial Medicine, Radboudumc, Nijmegen, The Netherlands
| | - Oksana Lapina
- Department for Radiology and Nuclear Medicine, Oslo University Hospital, Oslo, Norway
| | - Yngve T Bliksrud
- Norwegian National Unit for Diagnostics of Congenital Metabolic Disorders, Department of Medical Biochemistry, Oslo University Hospital, Oslo, Norway
| | - Mari A Kulseth
- Department of Medical Genetics, Oslo University Hospital, Oslo, Norway
| | - Silja S Amundsen
- Department of Medical Genetics, Oslo University Hospital, Oslo, Norway
| | - Terje R Selberg
- Department of Pediatrics, Ostfold Hospital Trust, Kalnes, Norway
| | - Marion Ybema-Antoine
- Department of Pediatrics, Radboud Centre for Mitochondrial Medicine, Radboudumc, Nijmegen, The Netherlands
| | - Omar A Z Tutakhel
- Department of Laboratory Medicine, Translational Metabolic Laboratory, Radboud Centre for Mitochondrial Medicine, Radboudumc, Nijmegen, The Netherlands
| | - Lawrence Greed
- Department of Clinical Biochemistry, PathWest, Perth, Western Australia, Australia
| | - David R Thorburn
- Murdoch Children's Research Institute and Victorian Clinical Genetics Services, Royal Children's Hospital, Melbourne, Victoria, Australia.,Department of Pediatrics, University of Melbourne, Melbourne, Victoria, Australia
| | - Trine Tangeraas
- Norwegian National Unit for Newborn Screening, Division of Pediatric and Adolescent Medicine, Oslo University Hospital, Oslo, Norway
| | - Shanti Balasubramaniam
- Western Sydney Genetics Program, The Children's Hospital at Westmead, Sydney, New South Wales, Australia
| | - Richard J T Rodenburg
- Department of Laboratory Medicine, Translational Metabolic Laboratory, Radboud Centre for Mitochondrial Medicine, Radboudumc, Nijmegen, The Netherlands.,Department of Pediatrics, Radboud Centre for Mitochondrial Medicine, Radboudumc, Nijmegen, The Netherlands
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