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. 2000 Jun;155(2):777–783. doi: 10.1093/genetics/155.2.777

Replicative advantage and tissue-specific segregation of RR mitochondrial DNA between C57BL/6 and RR heteroplasmic mice.

K Takeda 1, S Takahashi 1, A Onishi 1, H Hanada 1, H Imai 1
PMCID: PMC1461126  PMID: 10835398

Abstract

To investigate the interactions between mtDNA and nuclear genomes, we produced heteroplasmic maternal lineages by transferring the cytoplasts between the embryos of two mouse strains, C57BL/6 (B6) and RR. A total of 43 different nucleotides exist in the displacement-loop (D-loop) region of mtDNA between B6 and RR. Heteroplasmic embryos were reconstructed by electrofusion using a blastomere from a two-cell stage embryo of one strain and an enucleated blastomere from a two-cell stage embryo of the other strain. Equivalent volumes of both types of mtDNAs were detected in blastocyst stage embryos. However, the mtDNA from the RR strain became biased in the progeny, regardless of the source of the nuclear genome. The RR mtDNA population was very high in most of the tissues examined but was relatively low in the brain and the heart. An age-related increase of RR mtDNA was also observed in the blood. The RR mtDNAs in the reconstructed embryos and in the embryos collected from heteroplasmic mice showed a different segregation pattern during early embryonic development. These results suggest that the RR mtDNA has a replicative advantage over B6 mtDNA during embryonic development and differentiation, regardless of the type of nuclear genome.

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Selected References

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