Role of MPK4 in pathogen-associated molecular pattern-triggered alternative splicing in Arabidopsis
KAUST DepartmentBiological and Environmental Science and Engineering (BESE) Division
Center for Desert Agriculture
DARWIN21, Biological and Environmental Sciences and Engineering Division, King AbdullahUniversity of Science and Technology (KAUST), Thuwal, Saudi Arabia.
Red Sea Research Center (RSRC)
Permanent link to this recordhttp://hdl.handle.net/10754/630774
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AbstractAlternative splicing (AS) of pre-mRNAs in plants is an important mechanism of gene regulation in environmental stress tolerance but plant signals involved are essentially unknown. Pathogen-associated molecular pattern (PAMP)-triggered immunity (PTI) is mediated by mitogen-activated protein kinases and the majority of PTI defense genes are regulated by MPK3, MPK4 and MPK6. These responses have been mainly analyzed at the transcriptional level, however many splicing factors are direct targets of MAPKs. Here, we studied alternative splicing induced by the PAMP flagellin in Arabidopsis. We identified 506 PAMP-induced differentially alternatively spliced (DAS) genes. Importantly, of the 506 PAMP-induced DAS genes, only 89 overlap with the set of 1950 PAMP-induced differentially expressed genes (DEG), indicating that transcriptome analysis does not identify most DAS events. Global DAS analysis of mpk3, mpk4, and mpk6 mutants in the absence of PAMP treatment showed no major splicing changes. However, in contrast to MPK3 and MPK6, MPK4 was found to be a key regulator of PAMP-induced DAS events as the AS of a number of splicing factors and immunity-related protein kinases is affected, such as the calcium-dependent protein kinase CPK28, the cysteine-rich receptor like kinases CRK13 and CRK29 or the FLS2 co-receptor SERK4/BKK1. Although MPK4 is guarded by SUMM2 and consequently, the mpk4 dwarf and DEG phenotypes are suppressed in mpk4 summ2 mutants, MPK4-dependent DAS is not suppressed by SUMM2, supporting the notion that PAMP-triggered MPK4 activation mediates regulation of alternative splicing.
CitationBazin, J., Mariappan, K., Jiang, Y., Blein, T., Voelz, R., Crespi, M., & Hirt, H. (2020). Role of MPK4 in pathogen-associated molecular pattern-triggered alternative splicing in Arabidopsis. PLOS Pathogens, 16(4), e1008401. doi:10.1371/journal.ppat.1008401
SponsorsThis publication is based upon work supported by the King Abdullah University of Science and Technology (KAUST) to Prof. Heribert Hirt No. BAS/1/1062-01-01. This work was supported by grants of The King Abdullah University of Science and Technology (KAUST) International Program OCRF-2014-CRG4 to Prof Heribert Hirt and Dr. Martin Crespi. Dr Martin Crespi benefits from the support of Saclay Plant Sciences-SPS (ANR-17-EUR-0007). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
PublisherPublic Library of Science (PLoS)
Except where otherwise noted, this item's license is described as This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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