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Chromatin spatial organization of wild type and mutant peanuts reveals high-resolution genomic architecture and interaction alterations

Zhang, X., Pandey, M.K., Wang, J., Zhao, K., Ma, X., Li, Z., Zhao, K., Gong, F., Guo, B., Varshney, R.K.ORCID: 0000-0002-4562-9131 and Yin, D. (2021) Chromatin spatial organization of wild type and mutant peanuts reveals high-resolution genomic architecture and interaction alterations. Genome Biology, 22 (1). Art. 315.

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Abstract

Background

Three-dimensional (3D) chromatin organization provides a critical foundation to investigate gene expression regulation and cellular homeostasis.

Results

Here, we present the first 3D genome architecture maps in wild type and mutant allotetraploid peanut lines, which illustrate A/B compartments, topologically associated domains (TADs), and widespread chromatin interactions. Most peanut chromosomal arms (52.3%) have active regions (A compartments) with relatively high gene density and high transcriptional levels. About 2.0% of chromosomal regions switch from inactive to active (B-to-A) in the mutant line, harboring 58 differentially expressed genes enriched in flavonoid biosynthesis and circadian rhythm functions. The mutant peanut line shows a higher number of genome-wide cis-interactions than its wild-type. The present study reveals a new TAD in the mutant line that generates different chromatin loops and harbors a specific upstream AP2EREBP-binding motif which might upregulate the expression of the GA2ox gene and decrease active gibberellin (GA) content, presumably making the mutant plant dwarf.

Conclusions

Our findings will shed new light on the relationship between 3D chromatin architecture and transcriptional regulation in plants.

Item Type: Journal Article
Murdoch Affiliation(s): Centre for Crop and Food Innovation
Food Futures Institute
Western Australian State Agricultural Biotechnology Centre
Publisher: BioMed Central
Copyright: © 2021 The Authors.
URI: http://researchrepository.murdoch.edu.au/id/eprint/62948
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