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Title: Target specificity amongst canonical nuclear poly(A) polymerases in plants modulates organ growth and pathogen response      
keywords:
Transcriptome or Gene expression
ID:
PRJNA211863
description:
Polyadenylation of pre-mRNAs is critical for efficient nuclear export, stability and translation of the mature mRNAs, and thus for gene expression. The bulk of pre-mRNAs are processed by canonical nuclear poly(A) polymerase (PAPS). Both vertebrate and higher-plant genomes encode more than one isoform of this enzyme, and these are co-expressed in different tissues. However, in neither case is it known whether the isoforms fulfil different functions or polyadenylate distinct subsets of pre-mRNAs. Here we show that the three canonical nuclear PAPS isoforms in Arabidopsis are functionally specialized due to their evolutionarily divergent C-terminal domains. A strong loss-of-function mutation in PAPS1 causes a male gametophytic defect, while a weak allele leads to reduced leaf growth that results in part from a constitutive pathogen response. By contrast, plants lacking both PAPS2 and PAPS4 function are viable with wild-type leaf growth. Polyadenylation of SMALL AUXIN UP RNA (SAUR) mRNAs depends specifically on PAPS1 function. The resulting reduction in SAUR activity in paps1 mutants contributes to their reduced leaf growth, providing a causal link between polyadenylation of specific pre-mRNAs by a particular PAPS isoform and plant growth. This suggests the existence of an additional layer of regulation in plant and possibly vertebrate gene expression, where the relative activities of canonical nuclear PAPS isoforms control de novo synthesized poly(A)-tail length and hence expression of specific subsets of mRNAs. Overall design: Comparing inflorescences and seedlings from paps1-1 mutants and WT. 4 biological replicates for each genotype and tissue.
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landingpage: http://www.ncbi.nlm.nih.gov/bioproject/PRJNA211863
authentication:
none
authorization:
none
ID:
pmid:23918356
name:
Arabidopsis thaliana
ncbiID:
ncbitax:3702
abbreviation:
NCBI
homePage: http://www.ncbi.nlm.nih.gov
ID:
SCR:006472
name:
National Center for Biotechnology Information
homePage: http://www.ncbi.nlm.nih.gov/bioproject
ID:
SCR:004801
name:
NCBI BioProject