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PLoS Genet. 2014 Mar 6;10(3):e1004169. doi: 10.1371/journal.pgen.1004169. eCollection 2014 Mar.

GC-rich DNA elements enable replication origin activity in the methylotrophic yeast Pichia pastoris.

Author information

1
Department of Genome Sciences, University of Washington, Seattle, Washington, United States of America.
2
Department of Molecular Genetics, University of Toronto, Toronto, Canada; Department of Pharmaceutical Sciences, University of Toronto, Toronto, Canada.
3
Department of Molecular Genetics, University of Toronto, Toronto, Canada; Donnelly Centre, University of Toronto, Toronto, Canada.

Abstract

The well-studied DNA replication origins of the model budding and fission yeasts are A/T-rich elements. However, unlike their yeast counterparts, both plant and metazoan origins are G/C-rich and are associated with transcription start sites. Here we show that an industrially important methylotrophic budding yeast, Pichia pastoris, simultaneously employs at least two types of replication origins--a G/C-rich type associated with transcription start sites and an A/T-rich type more reminiscent of typical budding and fission yeast origins. We used a suite of massively parallel sequencing tools to map and dissect P. pastoris origins comprehensively, to measure their replication dynamics, and to assay the global positioning of nucleosomes across the genome. Our results suggest that some functional overlap exists between promoter sequences and G/C-rich replication origins in P. pastoris and imply an evolutionary bifurcation of the modes of replication initiation.

PMID:
24603708
PMCID:
PMC3945215
DOI:
10.1371/journal.pgen.1004169
[Indexed for MEDLINE]
Free PMC Article
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