RRC ID 51445
Author Navarro-González C, Moukadiri I, Villarroya M, López-Pascual E, Tuck S, Armengod ME.
Title Mutations in the Caenorhabditis elegans orthologs of human genes required for mitochondrial tRNA modification cause similar electron transport chain defects but different nuclear responses.
Journal PLoS Genet
Abstract Several oxidative phosphorylation (OXPHOS) diseases are caused by defects in the post-transcriptional modification of mitochondrial tRNAs (mt-tRNAs). Mutations in MTO1 or GTPBP3 impair the modification of the wobble uridine at position 5 of the pyrimidine ring and cause heart failure. Mutations in TRMU affect modification at position 2 and cause liver disease. Presently, the molecular basis of the diseases and why mutations in the different genes lead to such different clinical symptoms is poorly understood. Here we use Caenorhabditis elegans as a model organism to investigate how defects in the TRMU, GTPBP3 and MTO1 orthologues (designated as mttu-1, mtcu-1, and mtcu-2, respectively) exert their effects. We found that whereas the inactivation of each C. elegans gene is associated with a mild OXPHOS dysfunction, mutations in mtcu-1 or mtcu-2 cause changes in the expression of metabolic and mitochondrial stress response genes that are quite different from those caused by mttu-1 mutations. Our data suggest that retrograde signaling promotes defect-specific metabolic reprogramming, which is able to rescue the OXPHOS dysfunction in the single mutants by stimulating the oxidative tricarboxylic acid cycle flux through complex II. This adaptive response, however, appears to be associated with a biological cost since the single mutant worms exhibit thermosensitivity and decreased fertility and, in the case of mttu-1, longer reproductive cycle. Notably, mttu-1 worms also exhibit increased lifespan. We further show that mtcu-1; mttu-1 and mtcu-2; mttu-1 double mutants display severe growth defects and sterility. The animal models presented here support the idea that the pathological states in humans may initially develop not as a direct consequence of a bioenergetic defect, but from the cell's maladaptive response to the hypomodification status of mt-tRNAs. Our work highlights the important association of the defect-specific metabolic rewiring with the pathological phenotype, which must be taken into consideration in exploring specific therapeutic interventions.
Volume 13(7)
Pages e1006921
Published 2017-7-1
DOI 10.1371/journal.pgen.1006921
PMID 28732077
PMC PMC5544249
MeSH Animals Caenorhabditis elegans / genetics Caenorhabditis elegans Proteins / genetics* Carrier Proteins / genetics* Cell Nucleolus / genetics Disease Models, Animal Electron Transport / genetics GTP-Binding Proteins / genetics* Gene Expression / genetics Humans Mitochondria / genetics* Mitochondria / metabolism Mitochondrial Diseases / genetics* Mitochondrial Diseases / metabolism Mitochondrial Proteins / genetics* Mutation Oxidative Phosphorylation RNA, Transfer / genetics Signal Transduction / genetics tRNA Methyltransferases / genetics*
IF 5.175
Times Cited 3
C.elegans tm3160 tm5041