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The incomplete annotation of mitochondrial proteins highlights the need for a comprehensive gene inventory, particularly for Oxidative Phosphorylation (OXPHOS). To address this, we developed a CRISPR\/Cas9 loss-of-function library targeting nuclear-encoded mitochondrial genes and conducted galactose-based screenings to identify novel regulators of mitochondrial function. Our study generates a gene catalog essential for mitochondrial metabolism and maps a dynamic network of mitochondrial pathways, focusing on OXPHOS complexes. Computational analysis identifies RTN4IP1 and ECHS1 as key OXPHOS genes linked to mitochondrial diseases in humans. RTN4IP1 is found to be crucial for mitochondrial respiration, with complexome profiling revealing its role as an assembly factor required for the complete assembly of complex I. Furthermore, we discovered that ECHS1 controls oxidative metabolism independently of its canonical function in fatty acid oxidation. Its deletion impairs branched-chain amino acids (BCAA) catabolism, disrupting lipoic acid-dependent enzymes such as pyruvate dehydrogenase (PDH). This deleterious phenotype can be rescued by restricting valine intake or catabolism in ECHS1-deficient cells.<\/jats:p>","DOI":"10.1038\/s44319-025-00459-9","type":"journal-article","created":{"date-parts":[[2025,4,29]],"date-time":"2025-04-29T04:29:46Z","timestamp":1745900986000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Time-resolved mitochondrial screen identifies regulatory components of oxidative metabolism"],"prefix":"10.1038","volume":"26","author":[{"given":"Marcos","family":"Zamora-Dorta","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sara","family":"Laine-Men\u00e9ndez","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0401-7590","authenticated-orcid":false,"given":"David","family":"Abia","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9560-2957","authenticated-orcid":false,"given":"Pilar","family":"Gonz\u00e1lez-Garc\u00eda","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3355-0298","authenticated-orcid":false,"given":"Luis C","family":"L\u00f3pez","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0001-3432-595X","authenticated-orcid":false,"given":"Paula","family":"Fern\u00e1ndez-Montes","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Enrique","family":"Calvo","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1461-5092","authenticated-orcid":false,"given":"Jes\u00fas","family":"V\u00e1zquez","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3671-2961","authenticated-orcid":false,"given":"Jos\u00e9 Antonio","family":"Enr\u00edquez","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6836-7023","authenticated-orcid":false,"given":"Eduardo","family":"Balsa","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2025,4,29]]},"reference":[{"key":"459_CR1","doi-asserted-by":"crossref","DOI":"10.1186\/s13059-018-1536-8","volume":"19","author":"B Abu-Jamous","year":"2018","unstructured":"Abu-Jamous B, Kelly S (2018) Clust: automatic extraction of optimal co-expressed gene clusters from gene expression data. 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