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• W4382912246 abstract "Mitochondrial Complex I assembly (MCIA) is a multi-step process that necessitates the involvement of a variety of assembly factors and chaperones to ensure that the final active enzyme is correctly assembled. The role of the assembly factor evolutionarily conserved signalling intermediate in the toll (ECSIT) pathway was studied across various murine tissues to determine its role in this process and how this varied between tissues of varying energetic demands. We hypothesized that many of the known functions of ECSIT were unhindered by the introduction of an ENU-induced mutation, while its role in Complex I assembly was affected on a tissue-specific basis.Here, we describe a mutation in the MCIA factor ECSIT that reveals tissue-specific requirements for ECSIT in Complex I assembly. MCIA is a multi-step process dependent on assembly factors that organize and arrange the individual subunits, allowing for their incorporation into the complete enzyme complex. We have identified an ENU-induced mutation in ECSIT (N209I) that exhibits a profound effect on Complex I component expression and assembly in heart tissue, resulting in hypertrophic cardiomyopathy in the absence of other phenotypes. The dysfunction of Complex I appears to be cardiac specific, leading to a loss of mitochondrial output as measured by Seahorse extracellular flux and various biochemical assays in heart tissue, while mitochondria from other tissues were unaffected.These data suggest that the mechanisms underlying Complex I assembly and activity may have tissue-specific elements tailored to the specific demands of cells and tissues. Our data suggest that tissues with high-energy demands, such as the heart, may utilize assembly factors in different ways to low-energy tissues in order to improve mitochondrial output. These data have implications for the diagnosis and treatment of various disorders of mitochondrial function as well as cardiac hypertrophy with no identifiable underlying genetic cause." @default.
• W4382912246 created "2023-07-03" @default.
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• W4382912246 date "2023-07-03" @default.
• W4382912246 modified "2023-10-18" @default.
• W4382912246 title "Tissue-specific differences in the assembly of mitochondrial Complex I are revealed by a novel ENU mutation in ECSIT" @default.
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• W4382912246 doi "https://doi.org/10.1093/cvr/cvad101" @default.
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