Abstract
Gene expression is an extensively controlled process that occurs at various levels, transcription being one of the most crucial. It depends on a variety of interactions mediated by the core promoter region, sequence specific DNA binding proteins and their cognate promoter elements. Promoters comprise cis regulatory elements, clusters of short sequences that provide binding sites for transcription factors. According to PLACE database, there are 469 cis regulatory elements present in plants. The ACGT core sequence has been established as a functionally important cis element in several promoters that respond to different stimuli like light, anaerobiosis, jasmonic acid and hormones such as salicylic acid, abscisic acid and auxin.
Highlights
Gene expression is an extensively controlled process that occurs at various levels, transcription being one of the most crucial
Using gene expression databases we observed trends suggesting that co occuring ACGT elements are responsible for gene regulation in response to exogenous stress
Another study from our group in Arabidopsis thaliana indicated that two copies of ACGT elements separated by 5 nucleotides gave the highest activation of the reporter gene which imparted salicylic acid inducibility
Summary
Gene expression is an extensively controlled process that occurs at various levels, transcription being one of the most crucial. We did comparative genomic analysis of four different plant genomes. Results indicated that certain spacer lengths are preferred over others that suggests that these lengths might be involved in vital physiological processes.
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