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The auxin-induced transcriptome for etiolated Arabidopsis seedlings using a structure/function approach
John Pufky1, Yang Qiu, Mulpuri V Rao
1Paradigm Genetics, 108 Alexander Drive, Research Triangle Park, NC 27709-4528, USA.
Functional & Integrative Genomics
|December 3, 2003
Summary
This study reveals how auxin (indole-3-acetic acid) rapidly alters gene expression in Arabidopsis. Key transcription factors are quickly affected, with specific DNA motifs influencing gene regulation by various auxins.
Area of Science:
- Plant Biology
- Molecular Biology
- Genomics
Background:
- Auxins are crucial plant hormones regulating growth and development.
- Understanding auxin's mode of action requires analyzing its effects on gene expression.
Purpose of the Study:
- To investigate auxin-induced transcriptional changes in Arabidopsis.
- To identify genes and DNA motifs involved in auxin response.
Main Methods:
- Transcriptome analysis using microarrays (20426 genes) in Arabidopsis seedlings.
- Treatment with indole-3-acetic acid (IAA) and five other auxins.
- Promoter region analysis to identify DNA motifs.
Main Results:
- Low concentration IAA rapidly altered expression of 70 genes within 20 min.
- Gene expression predominantly increased after 40 min.
- Genes encoding transcription factors were rapidly induced.
- Specific DNA motifs (ARFAT, MYC, DC3) were identified in regulated gene promoters.
Conclusions:
- Auxin rapidly modulates gene expression, particularly affecting transcription factors.
- Distinct DNA motifs are associated with transient and sustained auxin responses.
- Abscisic acid and low-temperature responsive elements suggest cross-talk in auxin signaling.