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Heat stress-related Exon skip governs Serine/Arginine-rich Splicing Factor SR45a variants underlying plant heat tolerance in Arabidopsis

ABSTRACT: Heat stress seriously affects the plant development and growth. Increasing evidence points to RNA splicing as co-transcriptional regulations linking heat stresses in plants. However, the mechanism of how heat stress trigger and affect alternative splicing (AS) events through crucial splicing factors is still not clear. Here, we discovered a heat stress-enhancing AS suppression involved in splicing factor SR45a function, whereby SR45a modulates automatic self regulation by strengthen the full length mRNA processing together with CBP20. A SR45a intron splicing–dependent luciferase transgenic line was generated to monitor the intron 4 splicing events. We determined that luciferase activity increases upon heat treatment due to the intron remove, which inhibits the production of SR45a splicing variants. Loss functions of SR45a rendered plants more sensitive to heat stress, whereas overexpresion full length SR45a expression enhanced their tolerance. Full length SR45a is Essential for heat-responsive gene expression and splicing. Interestingly, SR45a modulate self-splicing regulation through branch point recognition together with CBP20. Genetic and molecular experiments identified the CBP20 is a positive regulator under heat stress. In addition, we demonstrate that HSFA2 affects the transcriptional levels of SR45a to act upsteam of SR45a by directly binding SR45a promoter. Our research highlights the heat-responsive self-splicing regulation of SR45a as a novel feedback to enhance plant stress tolerance.

ORGANISM(S): Arabidopsis thaliana

PROVIDER: GSE248817 | GEO | 2024/11/30

REPOSITORIES: GEO

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Project description:gene expression was measured in control and heat resistance selected adult female flies before and at 8 time points after heat stress for 1h @ 36 degrees Abstract The availability of full genome sequences has allowed the construction of microarrays, with which screening of the full genome for changes in gene expression is possible. This method can provide a wealth of information about biology at the level of gene expression and is a powerful method to identify genes and pathways involved in various processes. In this study, we report a detailed analysis of the full heat stress response in Drosophila melanogaster females, using whole genome gene expression arrays (Affymetrix Inc, Santa Clara, CA, USA). The study focuses on up- as well as downregulation of genes from just before and at 8 time points after an application of short heat hardening (368C for 1 hour). The expression changes were followed up to 64 hours after the heat stress, using 4 biological replicates. This study describes in detail the dramatic change in gene expression over time induced by a short-term heat treatment. We found both known stress responding genes and new candidate genes, and processes to be involved in the stress response. We identified 3 main groups of stress responsive genes that were early–upregulated, early– downregulated, and late–upregulated, respectively, among 1222 differentially expressed genes in the data set. Comparisons with stress sensitive genes identified by studies of responses to other types of stress allow the discussion of heat-specific and general stress responses in Drosophila. Several unexpected features were revealed by this analysis, which suggests that novel pathways and mechanisms are involved in the responses to heat stress and to stress in general. The majority of stress responsive genes identified in this and other studies were downregulated, and the degree of overlap among downregulated genes was relatively high, whereas genes responding by upregulation to heat and other stress factors were more specific to the stress applied or to the conditions of the particular study. As an expected exception, heat shock genes were generally found to be upregulated by stress in general. Keywords: Time series

Project description:Gene expression was measured in control and heat resistance selected adult female flies before and at 8 time points after heat stress for 1h @ 36 degrees,Abstract The availability of full genome sequences has allowed the construction of microarrays, with which screening,of the full genome for changes in gene expression is possible. This method can provide a wealth of information about,biology at the level of gene expression and is a powerful method to identify genes and pathways involved in various,processes. In this study, we report a detailed analysis of the full heat stress response in Drosophila melanogaster,females, using whole genome gene expression arrays (Affymetrix Inc, Santa Clara, CA, USA). The study focuses on,up- as well as downregulation of genes from just before and at 8 time points after an application of short heat hardening,(368C for 1 hour). The expression changes were followed up to 64 hours after the heat stress, using 4 biological,replicates. This study describes in detail the dramatic change in gene expression over time induced by a short-term,heat treatment. We found both known stress responding genes and new candidate genes, and processes to be involved,in the stress response. We identified 3 main groups of stress responsive genes that were earlyâ??upregulated, earlyâ??,downregulated, and lateâ??upregulated, respectively, among 1222 differentially expressed genes in the data set. Comparisons,with stress sensitive genes identified by studies of responses to other types of stress allow the discussion of,heat-specific and general stress responses in Drosophila. Several unexpected features were revealed by this analysis,,which suggests that novel pathways and mechanisms are involved in the responses to heat stress and to stress in,general. The majority of stress responsive genes identified in this and other studies were downregulated, and the,degree of overlap among downregulated genes was relatively high, whereas genes responding by upregulation to heat,and other stress factors were more specific to the stress applied or to the conditions of the particular study. As an,expected exception, heat shock genes were generally found to be upregulated by stress in general.

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Heat stress-related Exon skip governs Serine/Arginine-rich Splicing Factor SR45a variants underlying plant heat tolerance in Arabidopsis

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