Counting mtDNA molecules in Phaseolus vulgaris: sublimons are constantly produced by recombination via short repeats and undergo rigorous selection during substoichiometric shifting

Counting mtDNA molecules in Phaseolus vulgaris: sublimons are constantly produced by... Sublimons are substoichiometric DNA molecules which are generated by recombinations across short repeats, located in main mitochondrial genome of plants. Since short repeats are believed to recombine irreversibly and to be usually inactive, it is unknown how substoichiometric sequences are maintained. Occasionally, sublimons are amplified during substoichiometric shifting (SSS) and take the role of the main genome. Using the Phaseolus vulgaris system, we have addressed the questions concerning accumulation of sublimons, the role of recombination in their maintenance and selective amplification during SSS. We found that sublimons accompanied by parental recombination sequences were maintained by constant recombination across a short 314-bp repeat. The abundance of these sublimons was three orders of magnitude higher than accumulation of those which could not be maintained by recombination because their parental forms were absent from the main genome. As expected for active recombination, two recombination-derived sublimons were equimolar and so were their parental forms. One parental and one substoichiometric form shared the A/C polymorphism indicating their frequent inter-conversion. Only the C variant of the sublimon was amplified during substoichiometric shift implying strong selection of DNA molecules operating during SSS. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Plant Molecular Biology Springer Journals

Counting mtDNA molecules in Phaseolus vulgaris: sublimons are constantly produced by recombination via short repeats and undergo rigorous selection during substoichiometric shifting

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Publisher
Springer Journals
Copyright
Copyright © 2009 by Springer Science+Business Media B.V.
Subject
Life Sciences; Plant Pathology; Biochemistry, general; Plant Sciences
ISSN
0167-4412
eISSN
1573-5028
D.O.I.
10.1007/s11103-009-9488-8
Publisher site
See Article on Publisher Site

Abstract

Sublimons are substoichiometric DNA molecules which are generated by recombinations across short repeats, located in main mitochondrial genome of plants. Since short repeats are believed to recombine irreversibly and to be usually inactive, it is unknown how substoichiometric sequences are maintained. Occasionally, sublimons are amplified during substoichiometric shifting (SSS) and take the role of the main genome. Using the Phaseolus vulgaris system, we have addressed the questions concerning accumulation of sublimons, the role of recombination in their maintenance and selective amplification during SSS. We found that sublimons accompanied by parental recombination sequences were maintained by constant recombination across a short 314-bp repeat. The abundance of these sublimons was three orders of magnitude higher than accumulation of those which could not be maintained by recombination because their parental forms were absent from the main genome. As expected for active recombination, two recombination-derived sublimons were equimolar and so were their parental forms. One parental and one substoichiometric form shared the A/C polymorphism indicating their frequent inter-conversion. Only the C variant of the sublimon was amplified during substoichiometric shift implying strong selection of DNA molecules operating during SSS.

Journal

Plant Molecular BiologySpringer Journals

Published: Apr 22, 2009

References

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