Active 5′ splice sites regulate the biogenesis efficiency of Arabidopsis microRNAs derived from intron-containing genes

Katarzyna Knop, Agata Stepien, Maria Barciszewska-Pacak, Michal Taube, Dawid Bielewicz, Michal Michalak, J.W. Borst, Artur Jarmolowski, Zofia Szweykowska-Kulinska*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

23 Citations (Scopus)

Abstract

Arabidopsis, miR402 that is encoded within the first intron of a protein-coding gene At1g77230, is induced by heat stress. Its upregulation correlates with splicing inhibition and intronic proximal polyA site selection. It suggests that miR402 is not processed from an intron, but rather from a shorter transcript after selection of the proximal polyA site within this intron. Recently, introns and active 5′ splice sites (5′ss’) have been shown to stimulate the accumulation of miRNAs encoded within the first exons of intron-containing MIR genes. In contrast, we have observed the opposite effect of splicing inhibition on intronic miR402 production. Transient expression experiments performed in tobacco leaves revealed a significant accumulation of the intronic mature miR402 when the 5′ss of the miR402-hosting intron was inactivated. In contrast, when the miR402 stem-loop structure was moved into the first exon, mutation of the first-intron 5′ss resulted in a decrease in the miRNA level. Thus, the 5′ss controls the efficiency of miRNA biogenesis. We also show that the SERRATE protein (a key component of the plant microprocessor) colocalizes and interacts with several U1 snRNP auxiliary proteins. We postulate that SERRATE-spliceosome connections have a direct effect on miRNA maturation.
Original languageEnglish
Pages (from-to)2757-2775
JournalNucleic acids research
Volume45
Issue number5
Early online date5 Oct 2016
DOIs
Publication statusPublished - 17 Mar 2017

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