Deep Conservation of cis-Element Variants Regulating Plant Hormonal Responses

Michal Lieberman-Lazarovich, Chen Yahav, Alon Israeli, Idan Efroni

Research output: Contribution to journalArticlepeer-review

33 Scopus citations


Phytohormones regulate many aspects of plant life by activating transcription factors (TFs) that bind sequence-specific response elements (REs) in regulatory regions of target genes. Despite their short length, REs are degenerate, with a core of just 3 to 4 bp. This degeneracy is paradoxical, as it reduces specificity and REs are extremely common in the genome. To study whether RE degeneracy might serve a biological function, we developed an algorithm for the detection of regulatory sequence conservation and applied it to phytohormone REs in 45 angiosperms. Surprisingly, we found that specific RE variants are highly conserved in core hormone response genes. Experimental evidence showed that specific variants act to regulate the magnitude and spatial profile of hormonal response in Arabidopsis (Arabidopsis thaliana) and tomato (Solanum lycopersicum). Our results suggest that hormone-regulated TFs bind a spectrum of REs, each coding for a distinct transcriptional response profile. Our approach has implications for precise genome editing and for rational promoter design.

Original languageAmerican English
Pages (from-to)2559-2572
Number of pages14
JournalPlant Cell
Issue number11
StatePublished - 1 Nov 2019

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Publisher Copyright:
© 2019 American Society of Plant Biologists. All rights reserved.


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