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Alliance"],"accepted":{"date-parts":[[2024,12,19]]},"published-print":{"date-parts":[[2025,3]]},"abstract":"<jats:p>\n                    Pathogenic variants in cytochrome\n                    <jats:italic>c<\/jats:italic>\n                    oxidase assembly factor 5 (COA5), a proposed complex IV (CIV) assembly factor, have been shown to cause clinical mitochondrial disease with two siblings affected by neonatal hypertrophic cardiomyopathy manifesting a rare, homozygous\n                    <jats:italic>COA5<\/jats:italic>\n                    missense variant (NM_001008215.3: c.157G&gt;C, p.Ala53Pro). The most striking observation in the affected individuals was an isolated impairment in the early stage of mitochondrial CIV assembly. In this study, we report an unrelated family in whom we have identified the same\n                    <jats:italic>COA5<\/jats:italic>\n                    variant with patient-derived fibroblasts and skeletal muscle biopsies replicating an isolated CIV deficiency. A CRISPR\/Cas9-edited homozygous\n                    <jats:italic>COA5<\/jats:italic>\n                    knockout U2OS cell line with a similar biochemical profile was generated to interrogate the functional role of the human COA5 protein. Mitochondrial complexome profiling pinpointed a role of COA5 in early CIV assembly, more specifically, its involvement in the stage between MTCO1 maturation and the incorporation of MTCO2. We therefore propose that the COA5 protein plays an essential role in the biogenesis of MTCO2 and its integration into the early CIV assembly intermediate for downstream assembly of the functional holocomplex.\n                  <\/jats:p>","DOI":"10.26508\/lsa.202403013","type":"journal-article","created":{"date-parts":[[2025,1,8]],"date-time":"2025-01-08T11:45:12Z","timestamp":1736336712000},"page":"e202403013","update-policy":"https:\/\/doi.org\/10.26508\/lsa.crossmarkpolicy","source":"Crossref","is-referenced-by-count":6,"title":["COA5 has an essential role in the early stage of mitochondrial complex IV assembly"],"prefix":"10.26508","volume":"8","author":[{"given":"Jia Xin","family":"Tang","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/01kj2bm70","id-type":"ROR","asserted-by":"publisher"}],"name":"Mitochondrial Research Group, Translational and Clinical Research Institute, Faculty of Medical Sciences, Newcastle University","place":[", Newcastle upon Tyne, 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