Complete elimination of maternal mitochondrial DNA during meiosis resulting in the paternal inheritance of the mitochondrial genome in Chlamydomonas species |
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Authors: | H Aoyama Y Hagiwara O Misumi T Kuroiwa S Nakamura |
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Institution: | (1) Laboratory of Cell and Functional Biology, Faculty of Science, University of the Ryukyus, Nishihara, Okinawa;(2) Department of Life Science, College of Science, Rikkyo University, Nishi-Ikebukuro, Tokyo |
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Abstract: | Summary. The non-Mendelian inheritance of organellar DNA is common in most plants and animals. In the isogamous green alga Chlamydomonas species, progeny inherit chloroplast genes from the maternal parent, as paternal chloroplast genes are selectively eliminated
in young zygotes. Mitochondrial genes are inherited from the paternal parent. Analogically, maternal mitochondrial DNA (mtDNA)
is thought to be selectively eliminated. Nevertheless, it is unclear when this selective elimination occurs. Here, we examined
the behaviors of maternal and paternal mtDNAs by various methods during the period between the beginning of zygote formation
and zoospore formation. First, we observed the behavior of the organelle nucleoids of living cells by specifically staining
DNA with the fluorochrome SYBR Green I and staining mitochondria with 3,3′-dihexyloxacarbocyanine iodide. We also examined
the fate of mtDNA of male and female parental origin by real-time PCR, nested PCR with single zygotes, and fluorescence in
situ hybridization analysis. The mtDNA of maternal origin was completely eliminated before the first cell nuclear division,
probably just before mtDNA synthesis, during meiosis. Therefore, the progeny inherit the remaining paternal mtDNA. We suggest
that the complete elimination of maternal mtDNA during meiosis is the primary cause of paternal mitochondrial inheritance.
Correspondence and reprints: Laboratory of Cell and Functional Biology, Faculty of Science, University of the Ryukyus, Nishihara,
Okinawa 901-0213, Japan. |
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Keywords: | : Mitochondrial DNA Paternal inheritance Nested polymerase chain reaction Chlamydomonas spp |
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