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Genome-wide Analysis Uncovers Regulation of Long Intergenic Noncoding RNAs in Arabidopsis

Overview
Journal Plant Cell
Specialties Biology
Cell Biology
Date 2012 Nov 9
PMID 23136377
Citations 341
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Abstract

Long intergenic noncoding RNAs (lincRNAs) transcribed from intergenic regions of yeast and animal genomes play important roles in key biological processes. Yet, plant lincRNAs remain poorly characterized and how lincRNA biogenesis is regulated is unclear. Using a reproducibility-based bioinformatics strategy to analyze 200 Arabidopsis thaliana transcriptome data sets, we identified 13,230 intergenic transcripts of which 6480 can be classified as lincRNAs. Expression of 2708 lincRNAs was detected by RNA sequencing experiments. Transcriptome profiling by custom microarrays revealed that the majority of these lincRNAs are expressed at a level between those of mRNAs and precursors of miRNAs. A subset of lincRNA genes shows organ-specific expression, whereas others are responsive to biotic and/or abiotic stresses. Further analysis of transcriptome data in 11 mutants uncovered SERRATE, CAP BINDING PROTEIN20 (CBP20), and CBP80 as regulators of lincRNA expression and biogenesis. RT-PCR experiments confirmed these three proteins are also needed for splicing of a small group of intron-containing lincRNAs.

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