Spliceosomal protein U1A is involved in alternative splicing and salt stress tolerance in Arabidopsis thaliana.

Abstract:

:Soil salinity is a significant threat to sustainable agricultural production worldwide. Plants must adjust their developmental and physiological processes to cope with salt stress. Although the capacity for adaptation ultimately depends on the genome, the exceptional versatility in gene regulation provided by the spliceosome-mediated alternative splicing (AS) is essential in these adaptive processes. However, the functions of the spliceosome in plant stress responses are poorly understood. Here, we report the in-depth characterization of a U1 spliceosomal protein, AtU1A, in controlling AS of pre-mRNAs under salt stress and salt stress tolerance in Arabidopsis thaliana. The atu1a mutant was hypersensitive to salt stress and accumulated more reactive oxygen species (ROS) than the wild-type under salt stress. RNA-seq analysis revealed that AtU1A regulates AS of many genes, presumably through modulating recognition of 5' splice sites. We showed that AtU1A is associated with the pre-mRNA of the ROS detoxification-related gene ACO1 and is necessary for the regulation of ACO1 AS. ACO1 is important for salt tolerance because ectopic expression of ACO1 in the atu1a mutant can partially rescue its salt hypersensitive phenotype. Our findings highlight the critical role of AtU1A as a regulator of pre-mRNA processing and salt tolerance in plants.

journal_name

Nucleic Acids Res

journal_title

Nucleic acids research

authors

Gu J,Xia Z,Luo Y,Jiang X,Qian B,Xie H,Zhu JK,Xiong L,Zhu J,Wang ZY

doi

10.1093/nar/gkx1229

subject

Has Abstract

pub_date

2018-02-28 00:00:00

pages

1777-1792

issue

4

eissn

0305-1048

issn

1362-4962

pii

4708260

journal_volume

46

pub_type

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