Arabidopsis DNA Replication Initiates in Intergenic, AT-rich Open Chromatin

Wheeler, E., Brooks, A.M., Concia, L., Vera, D., Wear, E. E., LeBlanc, C., Ramu, U., Vaughn, M. W., Bass, H., Martienssen, R. A., Thompson, W.F., Hanley-Bowdoin, L. (March 2020) Arabidopsis DNA Replication Initiates in Intergenic, AT-rich Open Chromatin. Plant Physiology. ISSN 0032-0889 (Public Dataset)

DOI: 10.1104/pp.19.01520


The selection and firing of DNA replication origins play key roles in ensuring that eukaryotes accurately replicate their genomes. This process is not well documented in plants due in large measure to difficulties in working with plant systems. We developed a new functional assay to label and map very early replicating loci that must, by definition, include at least a subset of replication origins. Arabidopsis thaliana cells were briefly labeled with 5-ethynyl-2'-deoxy-uridine, and nuclei were subjected to two-parameter flow sorting. We identified more than 5500 loci as initiation regions (IRs), the first regions to replicate in very early S phase. These were classified as strong or weak IRs based on the strength of their replication signals. Strong initiation regions were evenly spaced along chromosomal arms and depleted in centromeres, while weak initiation regions were enriched in centromeric regions. IRs are AT-rich sequences flanked by more GC-rich regions and located predominantly in intergenic regions. Nuclease sensitivity assays indicated that IRs are associated with accessible chromatin. Based on these observations, initiation of plant DNA replication shows some similarity to, but is also distinct from, initiation in other well-studied eukaryotic systems.

Item Type: Paper
Subjects: organism description > plant > Arabidopsis
bioinformatics > genomics and proteomics > genetics & nucleic acid processing > DNA, RNA structure, function, modification > DNA replication
bioinformatics > genomics and proteomics > genetics & nucleic acid processing > protein structure, function, modification > protein types > origin recognition complex
organism description > plant
CSHL Authors:
Communities: CSHL labs > Martienssen lab
CSHL Cancer Center Program > Gene Regulation and Inheritance Program
Depositing User: Adrian Gomez
Date: 23 March 2020
Date Deposited: 02 Apr 2020 17:10
Last Modified: 29 Jun 2021 17:56
PMCID: PMC7210620
Related URLs:
Dataset ID:

Actions (login required)

Administrator's edit/view item Administrator's edit/view item
CSHL HomeAbout CSHLResearchEducationNews & FeaturesCampus & Public EventsCareersGiving