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Plant Organelle Genome Replication

1
Department of Microbiology & Molecular Biology, Brigham Young University, Provo, UT 84602, USA
2
Agricultural Biotechnology Division, National Institute for Biotechnology & Genetic Engineering, Jhang Road, Faisalabad, Punjab 44000, Pakistan
*
Author to whom correspondence should be addressed.
Current address: United States Department of Agriculture, 975 Warson Rd, St. Louis, Mo 63132, USA.
Plants 2019, 8(10), 358; https://doi.org/10.3390/plants8100358
Received: 13 August 2019 / Revised: 14 September 2019 / Accepted: 18 September 2019 / Published: 21 September 2019
(This article belongs to the Special Issue Plant Organelle DNA Maintenance)
Mitochondria and chloroplasts perform essential functions in respiration, ATP production, and photosynthesis, and both organelles contain genomes that encode only some of the proteins that are required for these functions. The proteins and mechanisms for organelle DNA replication are very similar to bacterial or phage systems. The minimal replisome may consist of DNA polymerase, a primase/helicase, and a single-stranded DNA binding protein (SSB), similar to that found in bacteriophage T7. In Arabidopsis, there are two genes for organellar DNA polymerases and multiple potential genes for SSB, but there is only one known primase/helicase protein to date. Genome copy number varies widely between type and age of plant tissues. Replication mechanisms are only poorly understood at present, and may involve multiple processes, including recombination-dependent replication (RDR) in plant mitochondria and perhaps also in chloroplasts. There are still important questions remaining as to how the genomes are maintained in new organelles, and how genome copy number is determined. This review summarizes our current understanding of these processes. View Full-Text
Keywords: DNA replication; recombination-dependent replication (RDR); plant mitochondrial DNA; chloroplast DNA; DNA repair DNA replication; recombination-dependent replication (RDR); plant mitochondrial DNA; chloroplast DNA; DNA repair
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Morley, S.A.; Ahmad, N.; Nielsen, B.L. Plant Organelle Genome Replication. Plants 2019, 8, 358.

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