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Inter-mitochondrial complementation: Mitochondria-specific system preventing mice from expression of disease phenotypes by mutant mtDNA

Abstract

Here we investigated the pathogenesis of deletion mutant mitochondrial (mt)DNA by generating mice with mutant mtDNA carrying a 4696-basepair deletion (ΔmtDNA4696), and by using cytochrome c oxidase (COX) electron micrographs to identify COX activity at the individual mitochondrial level. All mitochondria in tissues with ΔmtDNA4696 showed normal COX activity until ΔmtDNA4696 accumulated predominantly; this prevented mice from expressing disease phenotypes. Moreover, we did not observe coexistence of COX-positive and -negative mitochondria within single cells. These results indicate the occurrence of inter-mitochondrial complementation through exchange of genetic contents between exogenously introduced mitochondria with ΔmtDNA4696 and host mitochondria with normal mtDNA. This complementation shows a mitochondria-specific mechanism for avoiding expression of deletion-mutant mtDNA, and opens the possibility of a gene therapy in which mitochondria possessing full-length DNA are introduced.

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Figure 1: Characterization of ΔmtDNA4696 in somatic cybrids.
Figure 2: Distribution of ΔmtDNA4696, a partially duplicated mtDNA and wild-type mtDNA in skeletal muscle, heart and kidney of mouse-0, -57 and -87, which respectively possessed 0%, 57% and 87% ΔmtDNA4696 in their tails.
Figure 3: Pathogenesis of ΔmtDNA4696 in skeletal muscles from mouse-0, -57 and -87.
Figure 4: Pathogenesis of ΔmtDNA4696 in hearts from mouse-0, -57 and -87.
Figure 5: Pathogenesis of ΔmtDNA4696 in kidneys from mouse-0, -57 and -87.
Figure 6: Effect of coexistence of similiar amounts of COX and COX+ mitochondria within the same cells.

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Acknowledgements

This work was supported by a grant for a Research Fellowship from the Japan Society for Promotion of Science for Young Scientists (to K.N., K.I. and K.I.); by a grant for the Hayashi project of TARA, University of Tsukuba; by Grants-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology of Japan (to J.-I.H.); and by Health Sciences Research Grants for Research on Brain Science from the Ministry of Health and Welfare of Japan (to J.-I.H, I.N. and Y.-i.G.).

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Correspondence to Jun-Ichi Hayashi.

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Nakada, K., Inoue, K., Ono, T. et al. Inter-mitochondrial complementation: Mitochondria-specific system preventing mice from expression of disease phenotypes by mutant mtDNA. Nat Med 7, 934–940 (2001). https://doi.org/10.1038/90976

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