Journal
FUNGAL BIOLOGY
Volume 116, Issue 8, Pages 919-931Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.funbio.2012.06.003
Keywords
DNA polymerase encoding; circular plasmids; mtDNA replication; Plasmid-like elements; Retroplasmids
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Funding
- USDA [95-37303-1785]
- Michigan Agriculture Experiment Station [MICL01662]
- Sigma Xi fellowship
- A.L. Rogers award
- Natural Sciences and Engineering Research Council of Canada
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The in vivo conformation and replication intermediates of fungal circular mitochondrial plasmids and plasmid-like mitochondrial element (plMEs) were analyzed by two-dimensional gel electrophoresis and electron microscopy. Plasmids with circular restriction maps exist predominantly as circular molecules and were found to replicate by rolling circle mechanisms. However, the reverse transcriptase-encoding Mauriceville plasmid of Neurospora crassa was observed to replicate by two possible mechanisms: one that is consistent with a reverse transcriptase-mediated process and a second one might involve rolling circle DNA replication. Like the mtDNA-derived plasmid-like elements of N. crassa (Hausner et al. 2006a, b), a plasmid-like element of Cryphonectria parasitica (plME-C9), which consists predominantly of a 1.4 kb nucleotide sequence different from mitochondrial DNA, also was found to replicate by a rolling circle mechanism. Although the techniques used in this study were not suited for the establishment of the in vivo conformation and mode of replication of the mtDNAs of Neurospora or Cryphonectria, we surmise that the rolling circle mechanism might be the predominant mode of DNA replication in fungal mitochondria. (C) 2012 The British Mycological Society. Published by Elsevier Ltd. All rights reserved.
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