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By analyzing mitochondrial morphology we uncovered that mutations within the <jats:italic>HADHA<\/jats:italic> or the <jats:italic>ACADVL<\/jats:italic> gene not only affect fatty acid oxidation, but also cause significant changes in the DNM1L\/MFN2 ratio leading to the significant accumulation of truncated and punctate mitochondria in contrast to network-like mitochondrial morphology in controls. These striking morphological abnormalities correlate with changes in OXPHOS, an imbalance in ROS levels, reduced mitochondrial respiration, reduced growth rates and significantly increased glucose uptake per cell, suggesting that <jats:italic>HADHA<\/jats:italic> and <jats:italic>ACADVL<\/jats:italic> mutations shift cellular energy household into glycolysis. Experiments using the NOX2-specific inhibitor Phox-I2 suggest that NOX2 is activated by accumulating long-chain fatty acids and generates ROS, which in turn changes mitochondrial morphology and activity. We thereby provide novel insights into the cellular energy household of cells from LCHADD\/VLCADD patients and demonstrate for the first time a connection between fatty acid metabolism, mitochondrial morphology and ROS in patients with these rare genetic disorders.<\/jats:p>","DOI":"10.1038\/s41598-018-21519-2","type":"journal-article","created":{"date-parts":[[2018,2,13]],"date-time":"2018-02-13T11:49:20Z","timestamp":1518522560000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":35,"title":["Very long-\/ and long Chain-3-Hydroxy Acyl CoA Dehydrogenase Deficiency correlates with deregulation of the mitochondrial fusion\/fission machinery"],"prefix":"10.1038","volume":"8","author":[{"given":"Judith","family":"Hagenbuchner","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sabine","family":"Scholl-Buergi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Daniela","family":"Karall","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michael J.","family":"Ausserlechner","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2018,2,19]]},"reference":[{"key":"21519_CR1","doi-asserted-by":"publisher","first-page":"52","DOI":"10.1016\/S0140-6736(89)90300-0","volume":"2","author":"RJ Wanders","year":"1989","unstructured":"Wanders, R. 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