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Transcription factor ABI 3 auto‐activates its own expression during dehydration stress response
Author(s) -
Bedi Sonia,
Nag Chaudhuri Ronita
Publication year - 2018
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1002/1873-3468.13194
Subject(s) - transcription factor , biology , transcription (linguistics) , histone , promoter , abscisic acid , arabidopsis , response element , genetics , microbiology and biotechnology , gene expression , gene , mutant , linguistics , philosophy
The transcription factor abscisic acid insensitive 3 ( ABI 3) has recently been shown to mediate the dehydration stress response in nonseed and seed plants by regulation of several downstream genes. Here, we show how ABI 3 autoregulates its transcription in response to dehydration stress signalling. Autoactivation is primarily through the Sph/ RY element CATGCA present at the promoter region of ABI 3. Along with other known cis ‐elements found at the ABI 3 promoter, CATGCA remains occluded by nucleosomes during transcription repression. The nucleosomes tend to reposit during active transcription and are associated with several histone modifications, such as H3K9 and K27 acetylations and H3K4 trimethylation. This work thus, reveals the genetic and epigenetic essentials required for expression of the ABI 3 gene, a crucial factor regulating dehydration stress signalling in Arabidopsis thaliana .