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Distinct expression patterns of natural antisense transcripts in Arabidopsis
Stefan R Henz1, Jason S Cumbie, Kristin D Kasschau
1Max Planck Institute for Developmental Biology, Department of Molecular Biology, Tuebingen, Germany.
Plant Physiology
|May 15, 2007
Summary
Overlapping natural antisense transcripts (cis-NATs) in Arabidopsis show a trend toward anticorrelated expression. However, evidence for widespread small RNA-mediated regulation of cis-NATs remains limited in this study.
Area of Science:
- Genomics
- Molecular Biology
- Plant Science
Background:
- Overlapping cis-natural antisense transcripts (cis-NATs) can form regulatory circuits involving small RNAs.
- Antagonistic expression, where cis-NATs show anticorrelated expression patterns, is a known but not fully understood phenomenon.
Purpose of the Study:
- To investigate the frequency and characteristics of anticorrelated expression in Arabidopsis cis-NAT pairs.
- To determine if small RNA-mediated silencing is a significant mechanism driving cis-NAT regulation in Arabidopsis.
Main Methods:
- Analysis of global expression profiles for Arabidopsis cis-NAT pairs and neighboring genes.
- Examination of small RNA sequencing data and RNA-silencing mutants.
- Correlation analysis of gene expression patterns and overlap features.
Main Results:
- Arabidopsis cis-NAT pairs exhibit significantly lower pairwise Pearson correlation coefficients compared to non-overlapping genes.
- A small number of cis-NAT pairs display statistically significant anticorrelated expression.
- Overlapping regions of cis-NATs are enriched for small RNA loci, but cis-NAT expression is not disproportionately affected in silencing mutants.
Conclusions:
- A trend toward anticorrelated expression exists for Arabidopsis cis-NAT pairs.
- Current data do not strongly support small RNA-mediated silencing as the primary driver of this anticorrelated expression for most cis-NATs.
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