Mutations in MTFMT underlie a human disorder of formylation causing impaired mitochondrial translation

Elena Tucker, Steven Hershman, Caroline Kohrer, Casey Belcher-Timme, Jinal Patel, Olga Goldberger, John Christodoulou, Jonathon Silberstein, Matthew McKenzie, Michael Ryan, Alison Compton, Jacob Jaffe, Steven Carr, Sarah Calvo, Uttam RajBhandary, David Thorburn, Vamsi Mootha

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    99 Citations (Scopus)

    Abstract

    The metazoan mitochondrial translation machinery is unusual in having a single tRNA(Met) that fulfills the dual role of the initiator and elongator tRNA(Met). A portion of the Met-tRNA(Met) pool is formylated by mitochondrial methionyl-tRNA formyltransferase (MTFMT) to generate N-formylmethionine-tRNA(Met) (fMet-tRNA(met)), which is used for translation initiation; however, the requirement of formylation for initiation in human mitochondria is still under debate. Using targeted sequencing of the mtDNA and nuclear exons encoding the mitochondrial proteome (MitoExome), we identified compound heterozygous mutations in MTFMT in two unrelated children presenting with Leigh syndrome and combined OXPHOS deficiency. Patient fibroblasts exhibit severe defects in mitochondrial translation that can be rescued by exogenous expression of MTFMT. Furthermore, patient fibroblasts have dramatically reduced fMet-tRNA(Met) levels and an abnormal formylation profile of mitochondrially translated COX1. Our findings demonstrate that MTFMT is critical for efficient human mitochondrial translation and reveal a human disorder of Met-tRNA(Met) formylation.
    Original languageEnglish
    Pages (from-to)428 - 434
    Number of pages7
    JournalCell Metabolism
    Volume14
    Issue number3
    DOIs
    Publication statusPublished - 2011

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