The DEAD-box RNA helicase SHI2 functions in repression of salt-inducible genes and regulation of cold-inducible gene splicing

Journal of Experimental Botany - Tập 71 Số 4 - Trang 1598-1613 - 2020
Bangshing Wang1, Haoxi Chai1, Yingli Zhong2, Yun Shen1, Wannian Yang3, Junping Chen4, Zhanguo Xin4, Huazhong Shi1,3
1Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, TX USA
2College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha, Hunan, China
3School of Life Sciences, Central China Normal University, Wuhan, China
4Plant Stress and Germplasm Development Unit, USDA-ARS, Lubbock, TX, USA

Tóm tắt

Abstract Gene regulation is central for growth, development, and adaptation to environmental changes in all living organisms. Many genes are induced by environmental cues, and the expression of these inducible genes is often repressed under normal conditions. Here, we show that the SHINY2 (SHI2) gene is important for repressing salt-inducible genes and also plays a role in cold response. The shi2 mutant displayed hypersensitivity to cold, abscisic acid (ABA), and LiCl. Map-based cloning demonstrates that SHI2 encodes a DEAD- (Asp-Glu-Ala-Asp) box RNA helicase with similarity to a yeast splicing factor. Transcriptomic analysis of the shi2 mutant in response to cold revealed that the shi2 mutation decreased the number of cold-responsive genes and the magnitude of their response, and resulted in the mis-splicing of some cold-responsive genes. Under salt stress, however, the shi2 mutation increased the number of salt-responsive genes but had a negligible effect on mRNA splicing. Our results suggest that SHI2 is a component in a ready-for-transcription repressor complex important for gene repression under normal conditions, and for gene activation and transcription under stress conditions. In addition, SHI2 also serves as a splicing factor required for proper splicing of cold-responsive genes and affects 5' capping and polyadenylation site selection.

Từ khóa


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