Chlamydomonas chloroplasts can use short dispersed repeats and multiple pathways to repair a double-strand break in the genome.

@article{Odom2008ChlamydomonasCC,
  title={Chlamydomonas chloroplasts can use short dispersed repeats and multiple pathways to repair a double-strand break in the genome.},
  author={O. W. Odom and Kwang-Hyun Baek and Radhika N Dani and David L. Herrin},
  journal={The Plant journal : for cell and molecular biology},
  year={2008},
  volume={53 5},
  pages={842-53}
}
Certain group I introns insert into intronless DNA via an endonuclease that creates a double-strand break (DSB). There are two models for intron homing in phage: synthesis-dependent strand annealing (SDSA) and double-strand break repair (DSBR). The Cr.psbA4 intron homes efficiently from a plasmid into the chloroplast psbA gene in Chlamydomonas, but little is known about the mechanism. Analysis of co-transformants selected using a spectinomycin-resistant 16S gene (16S(spec)) provided evidence… CONTINUE READING
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