Genetic mapping studies on crops suggest that agronomic traits can be controlled by gene–distal intergenic loci. Despite the biological importance and the potential agronomic utility of these loci, they remain virtually uncharacterized in all crop species to date. Here, we provide genetic, epigenomic and functional molecular evidence to support the widespread existence of gene–distal (hereafter, distal) loci that act as long-range transcriptional cis-regulatory elements (CREs) in the maize genome. Such loci are enriched for euchromatic features that suggest their regulatory functions. Chromatin loops link together putative CREs with genes and recapitulate genetic interactions. Putative CREs also display elevated transcriptional enhancer activities, as measured by self-transcribing active regulatory region sequencing. These results provide functional support for the widespread existence of CREs that act over large genomic distances to control gene expression.
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The data generated from this study has been uploaded to the Gene Expression Omnibus database and can be retrieved through accession number GSE120304. Additionally, the data from this study can be viewed interactively on the publicly accessible epigenome browser http://epigenome.genetics.uga.edu/PlantEpigenome/. The STARR-seq plasmid sequence and additional information can be found at Addgene, deposit number 117379 (https://www.addgene.org/117379/).
The code used for analyses can be accessed at https://github.com/schmitzlab/Widespread-Long-range-Cis-Regulatory-Elements-in-the-Maize-Genome/.
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This work was funded by the National Science Foundation (NSF) grant no. IOS-1546867 to R.J.S. and X.Z.; grant no. NSF IOS-1238142 to X.Z and M.J.S.; and grant no. NSF IOS-1456950 and NSF IOS-1546873 to A.G. F.J. and R.J.S. acknowledge support from the Technical University of Munich–Institute for Advanced Study funded by the German Excellent Initiative and the European Seventh Framework Programme under grant agreement no. 291763. F.J. is also supported by the SFB/Sonderforschungsbereich924 of the Deutsche Forschungsgemeinschaft. R.J.S. is a Pew Scholar in the Biomedical Sciences, supported by The Pew Charitable Trusts. M.C.-T. acknowledges support from the Impuls-und Vernetzungsfonds of the Helmholtz-Gemeinschaft (grant no. VH-NG-1219). J.Z. and his team is supported by the Programme for Guangdong Introducing Innovative and Entrepreneurial Teams (grant no. 2016ZT06S172). This work was supported in part by the National Institutes of Health Pathway to Independence Award no. K99/R00 GM127671 (M.J.R.) and the US Public Health Service Award (R01) no. GM035463 (V.G.C.) from the National Institutes of Health. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health.
R.J.S. and X.Z. are cofounders of REquest Genomics, LLC, a company that provides epigenomics services.
Peer review information Nature Plants thanks Dao-Xiu Zhou and the other, anonymous, reviewer(s) for their contribution to the peer review of this work.
Publisher’s note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
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Ricci, W.A., Lu, Z., Ji, L. et al. Widespread long-range cis-regulatory elements in the maize genome. Nat. Plants 5, 1237–1249 (2019) doi:10.1038/s41477-019-0547-0