Involvement of mitochondrial-targeted RecA in the repair of mitochondrial DNA in the moss, Physcomitrella patens

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概要

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• Homologous recombination is a universal process that contributes to genetic diversity and genomic integrity. Bacterial-type RecA generally exists in all bacteria and plays a crucial role in homologous recombination. Although RecA homologues also exist in plant mitochondria, there have been few reports about the in vivo functions of these homologues. We identified a recA gene orthologue (named PprecA1) in a cDNA library of the moss, Physcomitrella patens. N-terminal fusion of the putative organellar targeting sequence of PpRecA1 to GFP caused a targeting of PpRecA1 to mitochondria. PprecA1 partially complemented the effects of a DNA damaging agent in an Escherichia coli recA deficient strain. Additionally, the expression of PprecA1 was induced by treating the plants with DNA damaging agents. Disruption of PprecA1 by targeted replacement resulted lower rate of the recovery of the mitochondrial DNA from methyl methan sulfonate damage. This is the first report about the characteristics of a null mutant of bacterial-type recA gene in plant. The data suggest that PprecA1 participates in the repair of mitochondrial DNA in P. patens.

• 日本遺伝学会の論文
• 2007-02-25

著者

• Hasebe Mitsuyasu

  National Institute For Basic Biology

• Fujita Tomomichi

  Department Of Biological Sciences Faculty Of Science Hokkaido University

• Sekine Yasuhiko

  Department Of Life Science College Of Science Rikkyo (st. Paul's) University

• Inouye Takayuki

  Department Of Life Science College Of Science Rikkyo (st. Paul's) University

• Odahara Masaki

  Department Of Life Science College Of Science Rikkyo (st. Paul's) University

• FUJITA Tomomichi

  National Institute for Basic Biology

• Odahara Masaki

  Department Of Life Science College Of Science Rikkyou University

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