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Rodriguez Gallo MC, Uhrig RG. Phosphorylation mediated regulation of RNA splicing in plants. FRONTIERS IN PLANT SCIENCE 2023; 14:1249057. [PMID: 37780493 PMCID: PMC10539000 DOI: 10.3389/fpls.2023.1249057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/28/2023] [Accepted: 08/22/2023] [Indexed: 10/03/2023]
Abstract
For the past two decades, the study of alternative splicing (AS) and its involvement in plant development and stress response has grown in popularity. Only recently however, has the focus shifted to the study of how AS regulation (or lack-thereof) affects downstream mRNA and protein landscapes and how these AS regulatory events impact plant development and stress tolerance. In humans, protein phosphorylation represents one of the predominant mechanisms by which AS is regulated and thus the protein kinases governing these phosphorylation events are of interest for further study. Large-scale phosphoproteomic studies in plants have consistently found that RNA splicing-related proteins are extensively phosphorylated, however, the signaling pathways involved in AS regulation have not been resolved. In this mini-review, we summarize our current knowledge of the three major splicing-related protein kinase families in plants that are suggested to mediate AS phospho-regulation and draw comparisons to their metazoan orthologs. We also summarize and contextualize the phosphorylation events identified as occurring on splicing-related protein families to illustrate the high degree to which splicing-related proteins are modified, placing a new focus on elucidating the impacts of AS at the protein and PTM-level.
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Affiliation(s)
| | - R. Glen Uhrig
- University of Alberta, Department of Biological Sciences, Edmonton, AB, Canada
- University of Alberta, Department of Biochemistry, Edmonton, AB, Canada
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Chang J, Yan S, Geng Z, Wang Z. Inhibition of splicing factors SF3A3 and SRSF5 contributes to As 3+/Se 4+ combination-mediated proliferation suppression and apoptosis induction in acute promyelocytic leukemia cells. Arch Biochem Biophys 2023; 743:109677. [PMID: 37356608 DOI: 10.1016/j.abb.2023.109677] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Revised: 05/28/2023] [Accepted: 06/22/2023] [Indexed: 06/27/2023]
Abstract
The low-dose combination of Arsenite (As3+) and selenite (Se4+) has the advantages of lower biological toxicity and better curative effects for acute promyelocytic leukemia (APL) therapy. However, the underlying mechanisms remain unclear. Here, based on the fact that the combination of 2 μM A3+ plus 4 μM Se4+ possessed a stronger anti-leukemic effect on APL cell line NB4 as compared with each individual, we employed iTRAQ-based quantitative proteomics to identify a total of 58 proteins that were differentially expressed after treatment with As3+/Se4+ combination rather than As3+ or Se4+ alone, the majority of which were involved in spliceosome pathway. Among them, eight proteins stood out by virtue of their splicing function and significant changes. They were validated as being decreased in mRNA and protein levels under As3+/Se4+ combination treatment. Further functional studies showed that only knockdown of two splicing factors, SF3A3 and SRSF5, suppressed the growth of NB4 cells. The reduction of SF3A3 was found to cause G1/S cell cycle arrest, which resulted in proliferation inhibition. Moreover, SRSF5 downregulation induced cell apoptosis through the activation of caspase-3. Taken together, these findings indicate that SF3A3 and SRSF5 function as pro-leukemic factors and can be potential novel therapeutic targets for APL.
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Affiliation(s)
- Jiayin Chang
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210023, PR China
| | - Shihai Yan
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210023, PR China
| | - Zhirong Geng
- College of Pharmacy, Nanjing University of Chinese Medicine, Nanjing, 210046, PR China.
| | - Zhilin Wang
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210023, PR China.
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Bai R, Chen D, Xiong H, Song H, Wang T, Yang X, Tang J, Feng Y, Li J, Li F. SPAG6 c.900 T>C affects boar semen quality and blood-testis barrier function by creating a new splice acceptor site. Anim Genet 2023. [PMID: 37211688 DOI: 10.1111/age.13330] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2022] [Revised: 03/16/2023] [Accepted: 04/28/2023] [Indexed: 05/23/2023]
Abstract
Sperm associated antigen 6 (SPAG6) acts as a scaffolding protein in the center of the flagellar axoneme and has an impact on the maturation of the motility of mammalian sperm flagella and the maintenance of sperm structure. In our previous research, SPAG6 c.900 T>C in exon 7 and exon 7 skipped transcript was identified by analyzing RNA-seq data of testicular tissues from 60 day (sexually immature) and 180 day (sexually mature) Large White boars. Herein, we found porcine SPAG6 c.900 T>C to be associated with semen quality traits in Duroc, Large White and Landrace pigs. SPAG6 c.900 C can generate a new splice acceptor site, inhibit the occurrence of SPAG6 exon 7 skipping to a certain extent, thereby promote the growth of Sertoli cells and maintain the normal blood-testis barrier function. This study provides new insights into the molecular regulation of spermatogenesis and a new genetic marker for the improvement of semen quality in pigs.
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Affiliation(s)
- Rong Bai
- Key Laboratory of Pig Genetics and Breeding of Ministry of Agriculture and Key Laboratory of Agricultural Animal Genetics, Breeding and Reproduction of Ministry of Education, Huazhong Agricultural University, Wuhan, China
| | - Dake Chen
- Key Laboratory of Pig Genetics and Breeding of Ministry of Agriculture and Key Laboratory of Agricultural Animal Genetics, Breeding and Reproduction of Ministry of Education, Huazhong Agricultural University, Wuhan, China
| | - Hao Xiong
- Key Laboratory of Pig Genetics and Breeding of Ministry of Agriculture and Key Laboratory of Agricultural Animal Genetics, Breeding and Reproduction of Ministry of Education, Huazhong Agricultural University, Wuhan, China
| | - Huibin Song
- Key Laboratory of Pig Genetics and Breeding of Ministry of Agriculture and Key Laboratory of Agricultural Animal Genetics, Breeding and Reproduction of Ministry of Education, Huazhong Agricultural University, Wuhan, China
| | - Tiansu Wang
- Key Laboratory of Pig Genetics and Breeding of Ministry of Agriculture and Key Laboratory of Agricultural Animal Genetics, Breeding and Reproduction of Ministry of Education, Huazhong Agricultural University, Wuhan, China
| | - Xinpeng Yang
- Key Laboratory of Pig Genetics and Breeding of Ministry of Agriculture and Key Laboratory of Agricultural Animal Genetics, Breeding and Reproduction of Ministry of Education, Huazhong Agricultural University, Wuhan, China
| | - Jinhua Tang
- Key Laboratory of Pig Genetics and Breeding of Ministry of Agriculture and Key Laboratory of Agricultural Animal Genetics, Breeding and Reproduction of Ministry of Education, Huazhong Agricultural University, Wuhan, China
| | - Yue Feng
- Key Laboratory of Pig Genetics and Breeding of Ministry of Agriculture and Key Laboratory of Agricultural Animal Genetics, Breeding and Reproduction of Ministry of Education, Huazhong Agricultural University, Wuhan, China
| | - Jialian Li
- Key Laboratory of Pig Genetics and Breeding of Ministry of Agriculture and Key Laboratory of Agricultural Animal Genetics, Breeding and Reproduction of Ministry of Education, Huazhong Agricultural University, Wuhan, China
| | - Fenge Li
- Key Laboratory of Pig Genetics and Breeding of Ministry of Agriculture and Key Laboratory of Agricultural Animal Genetics, Breeding and Reproduction of Ministry of Education, Huazhong Agricultural University, Wuhan, China
- The Cooperative Innovation Center for Sustainable Pig Production, Wuhan, China
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SRSF10 stabilizes CDC25A by triggering exon 6 skipping to promote hepatocarcinogenesis. JOURNAL OF EXPERIMENTAL & CLINICAL CANCER RESEARCH : CR 2022; 41:353. [PMID: 36539837 PMCID: PMC9764681 DOI: 10.1186/s13046-022-02558-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/13/2022] [Accepted: 12/02/2022] [Indexed: 12/24/2022]
Abstract
BACKGROUND Alternative splicing (AS) events are extensively involved in the progression of diverse tumors, but how serine/arginine-rich splicing Factor 10 (SRSF10) behaves in hepatocellular carcinoma (HCC) has not been sufficiently studied. We aimed to determine SRSF10 associated AS mechanisms and their effects on HCC progression. METHODS The expression of SRSF10 in HCC tissues was examined, and the in vitro and in vivo functions of SRSF10 were investigated. The downstream AS targets were screened using RNA sequencing. The interaction between SRSF10 protein and exclusion of cell division cycle 25 A (CDC25A) mRNA was identified using RNA immunoprecipitation and crosslinking immunoprecipitation q-PCR. The effects of SRSF10 on CDC25A posttranslational modification, subcellular distribution, and protein stability were verified through coimmunoprecipitation, immunofluorescence, and western blotting. RESULTS SRSF10 was enriched in HCC tissues and facilitated HCC proliferation, cell cycle, and invasion. RNA sequencing showed that SRSF10 promotes exon 6 exclusion of CDC25A pre-mRNA splicing. As a crucial cell cycle mediator, the exon-skipped isoform CDC25A(△E6) was identified to be stabilized and retained in the nucleus due to the deletion of two ubiquitination (Lys150, Lys169) sites in exon 6. The stabilized isoform CDC25A(△E6) derived from AS had stronger cell cycle effects on HCC tumorigenesis, and playing a more significant role than the commonly expressed longer variant CDC25A(L). Interestingly, SRSF10 activated the carcinogenesis role of CDC25A through Ser178 dephosphorylation to cause nuclear retention. Moreover, CDC25A(△E6) was verified to be indispensable for SRSF10 to promote HCC development in vitro and in vivo. CONCLUSIONS We reveal a regulatory pattern whereby SRSF10 contributes to a large proportion of stabilized CDC25A(△E6) production, which is indispensable for SRSF10 to promote HCC development. Our findings uncover AS mechanisms such as CDC25A that might serve as potential therapeutic targets to treat HCC.
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Yamada M, Suzuki K, Tanabe N, Suzuki T, Nishizawa-Yokoi A, Shigeoka S, Yoshimura K. An oligonucleotide/oligosaccharide-binding-fold protein enhances the alternative splicing event producing thylakoid membrane-bound ascorbate peroxidase in Nicotiana tabacum. G3 (BETHESDA, MD.) 2022; 12:jkac169. [PMID: 35788847 PMCID: PMC9434269 DOI: 10.1093/g3journal/jkac169] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Accepted: 07/04/2022] [Indexed: 11/26/2022]
Abstract
The stromal and thylakoid membrane-bound ascorbate peroxidase isoforms are produced by the alternative splicing event of the 3'-terminal region of the APXII gene in spinach (Spinacia oleracea) and tobacco (Nicotiana tabacum), but not in Arabidopsis (Arabidopsis thaliana). However, all alternative splicing variants were detected in APXII gene-transformed Arabidopsis, indicating the occurrence of its regulatory mechanisms in Arabidopsis. The efficiency of this alternative splicing event in producing thylakoid membrane-bound ascorbate peroxidase mRNA is regulated by a splicing regulatory cis element, but trans splicing regulatory factor(s) for alternative splicing remain unclear. To identify this factor, we conducted a forward genetic screen using Arabidopsis in combination with a luciferase reporter system to evaluate the alternative splicing efficiency of thylakoid membrane-bound ascorbate peroxidase mRNA production. We isolated 9 mutant lines that showed low efficiency of the AS in producing thylakoid membrane-bound ascorbate peroxidase mRNA compared with that in the control plants. From one mutant [APXII alternative splicing inhibition (apsi1)], the causal gene responsible for the phenotype, AT5G38890 (oligonucleotide/oligosaccharide-binding-fold protein, APSI1), was identified. The levels of thylakoid membrane-bound ascorbate peroxidase mRNA from the transformed APXII gene decreased and increased in APSI1 knockout and APSI1-overexpressing plants, respectively. APSI1 was localized to the nucleus and specifically bound to the splicing regulatory cis element sequence. Tobacco plants that disrupted the closest homologs of APSI1 showed low levels of endogenous thylakoid membrane-bound ascorbate peroxidase mRNA. These results indicate that APSI1 is an enhancing component of the alternative splicing event of APXII.
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Affiliation(s)
- Masato Yamada
- Department of Food and Nutritional Science, College of Bioscience and Biotechnology, Chubu University, Kasugai, Aichi 487-8501, Japan
| | - Kanako Suzuki
- Department of Food and Nutritional Science, College of Bioscience and Biotechnology, Chubu University, Kasugai, Aichi 487-8501, Japan
| | - Noriaki Tanabe
- Department of Advanced Bioscience, Faculty of Agriculture, Kindai University, Nara 631-8505, Japan
| | - Takamasa Suzuki
- Department of Biological Chemistry, College of Bioscience and Biotechnology, Chubu University, Kasugai, Aichi 487-8501, Japan
| | - Ayako Nishizawa-Yokoi
- Institute of Agrobiological Sciences, National Agriculture and Food Research Organization, Tsukuba, Ibaraki 305-8604, Japan
| | - Shigeru Shigeoka
- Experimental Farm, Kindai University, Arita, Wakayama 643-0004, Japan
| | - Kazuya Yoshimura
- Department of Food and Nutritional Science, College of Bioscience and Biotechnology, Chubu University, Kasugai, Aichi 487-8501, Japan
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tRNA modifications and their potential roles in pancreatic cancer. Arch Biochem Biophys 2021; 714:109083. [PMID: 34785212 DOI: 10.1016/j.abb.2021.109083] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2021] [Revised: 11/05/2021] [Accepted: 11/06/2021] [Indexed: 12/23/2022]
Abstract
Since the breakthrough discovery of N6-methyladenosine (m6A), the field of RNA epitranscriptomics has attracted increasing interest in the biological sciences. Transfer RNAs (tRNAs) are extensively modified, and various modifications play a crucial role in the formation and stability of tRNA, which is universally required for accurate and efficient functioning of tRNA. Abnormal tRNA modification can lead to tRNA degradation or specific cleavage of tRNA into fragmented derivatives, thus affecting the translation process and frequently accompanying a variety of human diseases. Increasing evidence suggests that tRNA modification pathways are also misregulated in human cancers. In this review, we summarize tRNA modifications and their biological functions, describe the type and frequency of tRNA modification alterations in cancer, and highlight variations in tRNA-modifying enzymes and the multiple functions that they regulate in different types of cancers. Furthermore, the current implications and the potential role of tRNA modifications in the progression of pancreatic cancer are discussed. Collectively, this review describes recent advances in tRNA modification in cancers and its potential significance in pancreatic cancer. Further study of the mechanism of tRNA modifications in pancreatic cancer may provide possibilities for therapies targeting enzymes responsible for regulating tRNA modifications in pancreatic cancer.
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