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Motif detection in Arabidopsis: correlation with gene expression data
Chintalapati Janaki1, Rajendra R Joshi
1Bioinformatics Team, Scientific and Engineering Computing Group, Centre for Development of Advanced Computing, Pune University Campus, Ganeshkhind, Pune 411007, India.
In Silico Biology
|April 27, 2004
Summary
Researchers identified ten motifs in Arabidopsis diurnal rhythm genes, with five linked to light responsiveness. One motif, GGCCCA, clustered genes related to glycine-rich proteins and dehydrogenase/oxidoreductase families, aiding understanding of gene co-expression.
Area of Science:
- Plant molecular biology
- Genomics
- Bioinformatics
Background:
- Genes with similar expression patterns often share regulatory mechanisms controlled by transcription factors binding to cis-regulatory elements.
- Identifying these elements is crucial for understanding gene co-expression.
Purpose of the Study:
- To detect motifs in the upstream regions of Arabidopsis genes involved in diurnal rhythms.
- To correlate gene expression data with sequence information.
- To investigate the presence of identified motifs in circadian-regulated, dark-induced, and light-induced genes.
Main Methods:
- Motif detection in upstream gene regions.
- Comparison of detected motifs against existing transcription factor databases.
- Significance testing using random gene sets.
- Self-Organizing Map (SOM) clustering of gene expression profiles based on motif presence.
Main Results:
- Ten motifs were identified in the upstream regions of diurnal rhythm genes.
- Five of these motifs are known light-responsive elements.
- The motif GGCCCA was found conserved in 62 genes.
- SOM clustering revealed two main gene groups: glycine-rich proteins and dehydrogenase/oxidoreductase families.
Conclusions:
- Motif discovery in upstream regions provides insights into gene regulation in diurnal cycles.
- The GGCCCA motif is associated with specific gene families involved in plant responses.
- This study enhances understanding of cis-regulatory elements and gene co-expression in Arabidopsis.