Abstract
Short, specific DNA sequences called as Autonomously Replicating Sequence (ARS) elements function as plasmid as well as chromosomal replication origins in yeasts. As compared to ARSs, different chromosomal origins vary greatly in their efficiency and timing of replication probably due to their wider chromosomal context. The two Schizosaccharomyces pombe ARS elements, ars727 and ars2004, represent two extremities in their chromosomal origin activity – ars727 is inactive and late replicating, while ars2004 is a highly active, early-firing origin. To determine the effect of chromosomal context on the activity of these ARS elements, we have cloned them with their extended chromosomal context as well as in the context of each other in both orientations and analysed their replication efficiency by ARS and plasmid stability assays. We found that these ARS elements retain their origin activity in their extended/altered context. However, deletion of a 133-bp region of the previously reported ars727-associated late replication enforcing element (LRE) caused advancement in replication timing of the resulting plasmid. These results confirm the role of LRE in directing plasmid replication timing and suggest that the plasmid origin efficiency of ars2004 or ars727 remains unaltered by the extended chromosomal context.
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Acknowledgments
The authors are grateful to MM Panicker, NCBS, Bangalore, Rajiva Raman, BHU, Varanasi, and S Ganesh, BSBE, IIT, Kanpur, for extending laboratory support to carry out part of the work. This work was supported by CSIR research grants #38(1075)/03/EMRII & #38(1233)/09/EMRII to DDD. VPT is a recipient of a senior research fellowship from ICMR, New Delhi.
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Corresponding editor: Anand Kumar Bachhawat
[Pratihar AS, Tripathi VP, Yadav MP and Dubey DD 2015 Chromosomal context and replication properties of ARS plasmids in Schizosaccharomyces pombe. J. Biosci.] DOI 10.1007/s12038-015-9572-y
Supplementary materials pertaining to this article are available on the Journal of Biosciences Website at http://www.ias.ac.in/jbiosci/dec2015/supp/Pratihar.pdf
Aditya S Pratihar and Vishnu P Tripathi contributed equally to this work.
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Pratihar, A.S., Tripathi, V.P., Yadav, M.P. et al. Chromosomal context and replication properties of ARS plasmids in Schizosaccharomyces pombe . J Biosci 40, 845–853 (2015). https://doi.org/10.1007/s12038-015-9572-y
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DOI: https://doi.org/10.1007/s12038-015-9572-y