title: Expression of Rattus norvegicus mtDNA in Mus musculus cells results in multiple respiratory chain defects.
abstract: The production of in vitro and in vivo models of mitochondrial DNA (mtDNA) defects is currently limited by a lack of characterized mouse cell mtDNA mutants that may be expected to model human mitochondrial diseases. Here we describe the creation of transmitochondrial mouse (Mus musculus) cells repopulated with mtDNA from different murid species (xenomitochondrial cybrids). The closely related Mus spretus mtDNA is readily maintained when introduced into M. musculus mtDNA-less (rho(0)) cells, and the resulting cybrids have normal oxidative phosphorylation (OXPHOS). When the more distantly related Rattus norvegicus mtDNA is transferred to the mouse nuclear background the mtDNA is replicated, transcribed, and translated efficiently. However, function of several OXPHOS complexes that depend on the coordinated assembly of nuclear and mtDNA-encoded proteins is impaired. Complex I activity in the Rattus xenocybrid was 46% of the control mean; complex III was 37%, and complex IV was 78%. These defects combined to restrict maximal respiration to 12-31% of the control and M. spretus xenocybrids, as measured polarographically using isolated cybrid mitochondria. These defects are distinct to those previously reported for human/primate xenocybrids. It should be possible to produce other mouse xenocybrid constructs with less severe OXPHOS phenotypes, to model human mtDNA diseases.
authors.affiliation: Mutation Research Centre and the University of Melbourne, Department of Medicine, St. Vincent's Hospital, 41 Victoria Parade, Fitzroy 3065 Melbourne, Australia.
authors.forename: M
authors.initials: M
authors.lastname: McKenzie
authors.forename: I
authors.initials: I
authors.lastname: Trounce
mesh_terms: D000818:Animals; D015139:Blotting, Southern; D002460:Cell Line; D002467:Cell Nucleus / Q000378:metabolism; D004272:DNA, Mitochondrial / Q000378:metabolism*; D004579:Electron Transport / Q000235:genetics* / Q000502:physiology*; D005838:Genotype; D006801:Humans; D006822:Hybrid Cells; D019344:Lactic Acid / Q000378:metabolism; D051379:Mice; D008810:Mice, Inbred C57BL; D008808:Mice, Inbred CBA; D010085:Oxidative Phosphorylation; D010802:Phylogeny; D014176:Protein Biosynthesis; D051381:Rats; D017422:Sequence Analysis, DNA; D013045:Species Specificity; D013997:Time Factors
chemical_list: D004272:DNA, Mitochondrial; D019344:Lactic Acid