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Alternative splicing at NAGNAG acceptors in Arabidopsis thaliana SR and SR-related protein-coding genes

Journal Article · · BMC Genomics
 [1];  [2];  [3];  [4];  [4];  [3];  [2];  [4]
  1. Leibniz Institute for Age Research – Fritz Lipmann Institute, Jena (Germany); DOE/OSTI
  2. Leibniz Institute for Age Research – Fritz Lipmann Institute, Jena (Germany)
  3. Albert-Ludwigs-Univ. Freiburg (Germany). Inst. of Computer Science, Bioinformatics Group
  4. Colorado State Univ., Fort Collins, CO (United States). Dept. of Biology and Program in Molecular Plant Biology
Several recent studies indicate that alternative splicing in Arabidopsis and other plants is a common mechanism for post-transcriptional modulation of gene expression. However, few analyses have been done so far to elucidate the functional relevance of alternative splicing in higher plants. Representing a frequent and universal subtle alternative splicing event among eukaryotes, alternative splicing at NAGNAG acceptors contributes to transcriptome diversity and therefore, proteome plasticity. Alternatively spliced NAGNAG acceptors are overrepresented in genes coding for proteins with RNA-recognition motifs (RRMs). As SR proteins, a family of RRMcontaining important splicing factors, are known to be extensively alternatively spliced in Arabidopsis, we analyzed alternative splicing at NAGNAG acceptors in SR and SR-related genes. In a comprehensive analysis of the Arabidopsis thaliana genome, we identified 6,772 introns that exhibit a NAGNAG acceptor motif. Alternative splicing at these acceptors was assessed using available EST data, complemented by a sequence-based prediction method. Of the 36 identified introns within 30 SR and SR-related protein-coding genes that have a NAGNAG acceptor, we selected 15 candidates for an experimental analysis of alternative splicing under several conditions. We provide experimental evidence for 8 of these candidates being alternatively spliced. Quantifying the ratio of NAGNAG-derived splice variants under several conditions, we found organ-specific splicing ratios in adult plants and changes in seedlings of different ages. Splicing ratio changes were observed in response to heat shock and most strikingly, cold shock. Interestingly, the patterns of differential splicing ratios are similar for all analyzed genes. NAGNAG acceptors frequently occur in the Arabidopsis genome and are particularly prevalent in SR and SR-related protein-coding genes. A lack of extensive EST coverage can be compensated by using the proposed sequence-based method to predict alternative splicing at these acceptors. Our findings indicate that the differential effects on NAGNAG alternative splicing in SR and SR-related genes are organ- and condition-specific rather than gene-specific.
Research Organization:
Colorado State Univ., Fort Collins, CO (United States)
Sponsoring Organization:
Deutsche Forschungsgemeinschaft (DFG); Federal Ministry of Education and Research (BMBF); USDOE Office of Science (SC), Biological and Environmental Research (BER). Biological Systems Science Division
Grant/Contract Number:
FG02-04ER15556
OSTI ID:
1626462
Journal Information:
BMC Genomics, Journal Name: BMC Genomics Journal Issue: 1 Vol. 9; ISSN 1471-2164
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English

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Accurate prediction of NAGNAG alternative splicing journal April 2009
Comparative analysis indicates that alternative splicing in plants has a limited role in functional expansion of the proteome journal January 2009
Sequence features involved in the mechanism of 3' splice junction wobbling journal May 2010
Identification and characterization of NAGNAG alternative splicing in the moss Physcomitrella patens journal April 2010
CoSpliceNet: a framework for co-splicing network inference from transcriptomics data journal October 2016
BaRTv1.0: an improved barley reference transcript dataset to determine accurate changes in the barley transcriptome using RNA-seq journal December 2019
Alternative Splicing of RNA Triplets Is Often Regulated and Accelerates Proteome Evolution journal January 2012
A Subtle Alternative Splicing Event Gives Rise to a Widely Expressed Human RNase k Isoform journal May 2014
Deciphering the Plant Splicing Code: Experimental and Computational Approaches for Predicting Alternative Splicing and Splicing Regulatory Elements journal January 2012
Analysis of pollen-specific alternative splicing in Arabidopsis thaliana via semi-quantitative PCR posted_content March 2015
nagnag: Identification and quantification of NAGNAG alternative splicing using RNA-Seq data journal May 2015
Physiological state co-regulates thousands of mammalian mRNA splicing events at tandem splice sites and alternative exons journal July 2014
BaRTv1.0: an improved barley reference transcript dataset to determine accurate changes in the barley transcriptome using RNA-seq posted_content May 2019
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