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Lee S, Seo YE, Choi J, Yan X, Kim T, Choi D, Lee JH. Nucleolar actions in plant development and stress responses. PLANT, CELL & ENVIRONMENT 2024. [PMID: 39169813 DOI: 10.1111/pce.15099] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2024] [Revised: 08/09/2024] [Accepted: 08/10/2024] [Indexed: 08/23/2024]
Abstract
The nucleolus is conventionally acknowledged for its role in ribosomal RNA (rRNA) synthesis and ribosome biogenesis. Recent research has revealed its multifaceted involvement in plant biology, encompassing regulation of the cell cycle, development, and responses to environmental stresses. This comprehensive review explores the diverse roles of the nucleolus in plant growth and responses to environmental stresses. The introduction delves into its traditional functions in rRNA synthesis and potential participation in nuclear liquid-liquid phase separation. By examining the multifaceted roles of nucleolar proteins in plant development, we highlight the impacts of various nucleolar mutants on growth, development, and embryogenesis. Additionally, we reviewed the involvement of nucleoli in responses to abiotic and biotic stresses. Under abiotic stress conditions, the nucleolar structure undergoes morphological changes. In the context of biotic stress, the nucleolus emerges as a common target for effectors of pathogens for manipulation of host immunity to enhance pathogenicity. The detailed exploration of how pathogens interact with nucleoli and manipulate host responses provides valuable insights into plant stress responses as well as plant growth and development. Understanding these processes may pave the way for promising strategies to enhance crop resilience and mitigate the impact of biotic and abiotic stresses in agricultural systems.
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Affiliation(s)
- Soeui Lee
- Plant Immunity Research Center, Seoul National University, Seoul, South Korea
- Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul, South Korea
| | - Ye-Eun Seo
- Plant Immunity Research Center, Seoul National University, Seoul, South Korea
- Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul, South Korea
- Department of Agriculture, Forestry and Bioresources, College of Agriculture and Life Science, Plant Genomics and Breeding Institute, Seoul National University, Seoul, South Korea
| | - Jeen Choi
- Plant Immunity Research Center, Seoul National University, Seoul, South Korea
- Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul, South Korea
- Department of Agriculture, Forestry and Bioresources, College of Agriculture and Life Science, Plant Genomics and Breeding Institute, Seoul National University, Seoul, South Korea
| | - Xin Yan
- Plant Immunity Research Center, Seoul National University, Seoul, South Korea
- Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul, South Korea
- Department of Agriculture, Forestry and Bioresources, College of Agriculture and Life Science, Plant Genomics and Breeding Institute, Seoul National University, Seoul, South Korea
| | - Taewon Kim
- Plant Immunity Research Center, Seoul National University, Seoul, South Korea
- Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul, South Korea
- Department of Agriculture, Forestry and Bioresources, College of Agriculture and Life Science, Plant Genomics and Breeding Institute, Seoul National University, Seoul, South Korea
| | - Doil Choi
- Plant Immunity Research Center, Seoul National University, Seoul, South Korea
- Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul, South Korea
- Department of Agriculture, Forestry and Bioresources, College of Agriculture and Life Science, Plant Genomics and Breeding Institute, Seoul National University, Seoul, South Korea
| | - Joo Hyun Lee
- Plant Immunity Research Center, Seoul National University, Seoul, South Korea
- Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul, South Korea
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Yin L, Li L, Gao M, Qi Y, Xu L, Peng J. circMIRIAF aggravates myocardial ischemia-reperfusion injury via targeting miR-544/WDR12 axis. Redox Biol 2024; 73:103175. [PMID: 38795544 PMCID: PMC11140810 DOI: 10.1016/j.redox.2024.103175] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2024] [Revised: 04/26/2024] [Accepted: 04/29/2024] [Indexed: 05/28/2024] Open
Abstract
Exploring and discovering novel circRNAs is one of the ways to develop innovative drugs for the diagnosis and treatment of myocardial ischemia-reperfusion injury (MI/RI). In the work, some dysregulated circRNAs were found by microarray screening analysis in AC16 cells, and hsa_circRNA_104852 named circMIRIAF was screened, which was up-regulated in AC16 cells damaged by hypoxia-reoxygenation injury (H/RI). The comprehensive analysis of ceRNA network revealed the potential relationship of circMIRIAF/miR-544/WDR12. Then, the results of interaction research confirmed that circMIRIAF acted as sponge of miR-544 to positively regulate WDR12 protein expression. Further, the validation results indicate that miR-544 silencing increased the expression of WDR12, and WDR12 activated Notch1 signal to aggravate H/RI of AC16 cells and MI/RI of mice via regulating oxidative stress and inflammation. Furthermore, silencing circMIRIAF caused the decreased circMIRIAF levels and the increased miR-544 levels in cardiomyocytes, while excessive miR-544 inhibited WDR12 expression to alleviate the disorder. On the contrary, excessive circMIRIAF increased WDR12 expression by adsorbing miR-544 to exacerbate H/RI in AC16 cells. In addition, circMIRIAF siRNA reversed the aggravation of H/RI in cells caused by WDR12 overexpression. Overall, circMIRIAF can serve as a drug target or treating MI/RI, and circMIRIAF could sponge miR-544 and enhance WDR12 expression to aggravate MI/RI, which may provide a novel therapeutic strategy for MI/RI treatment.
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Affiliation(s)
- Lianhong Yin
- Department of Pharmaceutical Analysis, Dalian Medical University, Western 9 Lvshunnan Road, Dalian, 116044, China
| | - Lili Li
- College of Pharmacy, Anhui University of Chinese Medicine, Hefei, 230012, China
| | - Meng Gao
- Department of Pharmaceutical Analysis, Dalian Medical University, Western 9 Lvshunnan Road, Dalian, 116044, China
| | - Yan Qi
- Department of Pharmaceutical Analysis, Dalian Medical University, Western 9 Lvshunnan Road, Dalian, 116044, China
| | - Lina Xu
- Department of Pharmaceutical Analysis, Dalian Medical University, Western 9 Lvshunnan Road, Dalian, 116044, China.
| | - Jinyong Peng
- Department of Pharmaceutical Analysis, Dalian Medical University, Western 9 Lvshunnan Road, Dalian, 116044, China; College of Pharmacy, Hubei University of Chinese Medicine, Wuhan, 430065, China; Hubei Shizhen Laboratory, Wuhan, 430065, China.
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3
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Ji R, Zhang Z, Yang Z, Chen X, Yin T, Yang J. BOP1 contributes to the activation of autophagy in polycystic ovary syndrome via nucleolar stress response. Cell Mol Life Sci 2024; 81:101. [PMID: 38409361 PMCID: PMC10896891 DOI: 10.1007/s00018-023-05091-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2023] [Revised: 12/04/2023] [Accepted: 12/13/2023] [Indexed: 02/28/2024]
Abstract
Abnormal autophagy is one of the vital features in polycystic ovary syndrome (PCOS). However, the underlying molecular mechanisms remain unelucidated. In this study, we aimed to investigate whether Block of Proliferation 1 (BOP1) is involved in the onset of autophagy activation of granulosa cells in PCOS. Firstly, we found that BOP1 expression was significantly down-regulated in the ovaries of PCOS mice, which was associated with the development of PCOS. Next, local injection of lentiviral vectors in the ovary for the overexpression of BOP1 significantly alleviated the phenotypes of elevated androgens, disturbed estrous cycle, and abnormal follicular development in PCOS mice. Subsequently, we found that knockdown of BOP1 activated autophagy of granulosa cells in the in vitro experiments, whereas overexpression of BOP1 inhibited autophagy in both in vivo and in vitro models. Mechanistically, BOP1 knockdown triggered the nucleolus stress response, which caused RPL11 to be released from the nucleolus into the nucleoplasm and inhibited the E3 ubiquitination ligase of MDM2, thereby enhancing the stability of p53. Subsequently, P53 inhibited mTOR, thereby activating autophagy in granulosa cells. In addition, the mRNA level of BOP1 was negatively correlated with antral follicle count (AFC), body-mass index (BMI), serum androgen levels, and anti-Mullerian hormone (AMH) in patients with PCOS. In summary, our study demonstrates that BOP1 downregulation inhibits mTOR phosphorylation through activation of the p53-dependent nucleolus stress response, which subsequently contributes to aberrant autophagy in granulosa cells, revealing that BOP1 may be a key target for probing the mechanisms of PCOS.
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Affiliation(s)
- Rui Ji
- Reproductive Medical Center, Renmin Hospital of Wuhan University, Wuhan, China
- Hubei Clinic Research Center for Assisted Reproductive Technology and Embryonic Development, Wuhan, China
| | - Zhimo Zhang
- Reproductive Medical Center, Renmin Hospital of Wuhan University, Wuhan, China
- Hubei Clinic Research Center for Assisted Reproductive Technology and Embryonic Development, Wuhan, China
| | - Zhe Yang
- Reproductive Medical Center, Renmin Hospital of Wuhan University, Wuhan, China
- Hubei Clinic Research Center for Assisted Reproductive Technology and Embryonic Development, Wuhan, China
| | - Xin Chen
- Reproductive Medical Center, Renmin Hospital of Wuhan University, Wuhan, China
- Hubei Clinic Research Center for Assisted Reproductive Technology and Embryonic Development, Wuhan, China
| | - Tailang Yin
- Reproductive Medical Center, Renmin Hospital of Wuhan University, Wuhan, China.
- Hubei Clinic Research Center for Assisted Reproductive Technology and Embryonic Development, Wuhan, China.
| | - Jing Yang
- Reproductive Medical Center, Renmin Hospital of Wuhan University, Wuhan, China.
- Hubei Clinic Research Center for Assisted Reproductive Technology and Embryonic Development, Wuhan, China.
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Zakrzewska-Placzek M, Golisz-Mocydlarz A, Krzyszton M, Piotrowska J, Lichocka M, Kufel J. The nucleolar protein NOL12 is required for processing of large ribosomal subunit rRNA precursors in Arabidopsis. BMC PLANT BIOLOGY 2023; 23:538. [PMID: 37919659 PMCID: PMC10623804 DOI: 10.1186/s12870-023-04561-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2023] [Accepted: 10/26/2023] [Indexed: 11/04/2023]
Abstract
BACKGROUND NOL12 5'-3' exoribonucleases, conserved among eukaryotes, play important roles in pre-rRNA processing, ribosome assembly and export. The most well-described yeast counterpart, Rrp17, is required for maturation of 5.8 and 25S rRNAs, whereas human hNOL12 is crucial for the separation of the large (LSU) and small (SSU) ribosome subunit rRNA precursors. RESULTS In this study we demonstrate that plant AtNOL12 is also involved in rRNA biogenesis, specifically in the processing of the LSU rRNA precursor, 27S pre-rRNA. Importantly, the absence of AtNOL12 alters the expression of many ribosomal protein and ribosome biogenesis genes. These changes could potentially exacerbate rRNA biogenesis defects, or, conversely, they might stem from the disturbed ribosome assembly caused by delayed pre-rRNA processing. Moreover, exposure of the nol12 mutant to stress factors, including heat and pathogen Pseudomonas syringae, enhances the observed molecular phenotypes, linking pre-rRNA processing to stress response pathways. The aberrant rRNA processing, dependent on AtNOL12, could impact ribosome function, as suggested by improved mutant resistance to ribosome-targeting antibiotics. CONCLUSION Despite extensive studies, the pre-rRNA processing pathway in plants remains insufficiently characterized. Our investigation reveals the involvement of AtNOL12 in the maturation of rRNA precursors, correlating this process to stress response in Arabidopsis. These findings contribute to a more comprehensive understanding of plant ribosome biogenesis.
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Affiliation(s)
- Monika Zakrzewska-Placzek
- Institute of Genetics and Biotechnology, Faculty of Biology, University of Warsaw, Pawinskiego 5a, Warsaw, 02-106, Poland.
| | - Anna Golisz-Mocydlarz
- Institute of Genetics and Biotechnology, Faculty of Biology, University of Warsaw, Pawinskiego 5a, Warsaw, 02-106, Poland
| | - Michal Krzyszton
- Laboratory of Seeds Molecular Biology, Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Pawinskiego 5a, Warsaw, 02-106, Poland
| | - Justyna Piotrowska
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Pawinskiego 5a, Warsaw, 02-106, Poland
| | - Malgorzata Lichocka
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Pawinskiego 5a, Warsaw, 02-106, Poland
| | - Joanna Kufel
- Institute of Genetics and Biotechnology, Faculty of Biology, University of Warsaw, Pawinskiego 5a, Warsaw, 02-106, Poland.
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Wu R, Teng X, Song Q, Chen S, Wang L, Liao J, Zou C. Single-cell RNA sequencing reveals sexual diversity in the human bladder and its prospective impacts on bladder cancer and urinary tract infection. BMC Med Genomics 2023; 16:122. [PMID: 37277784 DOI: 10.1186/s12920-023-01535-6] [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: 01/26/2023] [Accepted: 05/09/2023] [Indexed: 06/07/2023] Open
Abstract
BACKGROUND Some bladder-related diseases, such as bladder urinary tract infection (UTI) and bladder cancer (BCa), have significant six differences in incidence and prognosis. However, the molecular mechanisms underlying these sex differences are still not fully understood. Understanding the sex-biased differences in gene expression in normal bladder cells can help resolve these problems. METHODS We first collected published single-cell RNA sequencing (scRNA-seq) data of normal human bladders from females and males to map the bladder transcriptomic landscape. Then, Gene Ontology (GO) analysis and gene set enrichment analysis (GSEA) were used to determine the significant pathways that changed in the specific cell populations. The Monocle2 package was performed to reconstruct the differentiation trajectories of fibroblasts. In addition, the scMetabolism package was used to analyze the metabolic activity at the single-cell level, and the SCENIC package was used to analyze the regulatory network. RESULTS In total, 27,437 cells passed stringent quality control, and eight main cell types in human bladder were identified according to classical markers. Sex-based differential gene expression profiles were mainly observed in human bladder urothelial cells, fibroblasts, B cells, and T cells. We found that urothelial cells in males demonstrated a higher growth rate. Moreover, female fibroblasts produced more extracellular matrix, including seven collagen genes that may mediate BCa progression. Furthermore, the results showed that B cells in female bladders exhibited more B-cell activated signals and a higher expression of immunoglobulin genes. We also found that T cells in female bladders exhibited more T-cell activated signals. These different biological functions and properties of these cell populations may correlate with sex differences in UTI and BCa, and result in different disease processes and outcomes. CONCLUSIONS Our study provides reasonable insights for further studies of sex-based physiological and pathological disparities in the human bladder, which will contribute to the understanding of epidemiological differences in UTI and BCa.
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Affiliation(s)
- Ribao Wu
- Center for Translational Medicine, Key Laboratory of Longevity and Aging-related Diseases of Chinese Ministry of Education, Institute of Neuroscience and Guangxi Key Laboratory of Brain Science, School of Basic Medical Sciences, Guangxi Medical University, Nanning, Guangxi, China
| | - Xiahong Teng
- School of International Education, Guangxi Medical University, Nanning, Guangxi, China
| | - Qiong Song
- Center for Translational Medicine, Key Laboratory of Longevity and Aging-related Diseases of Chinese Ministry of Education, Institute of Neuroscience and Guangxi Key Laboratory of Brain Science, School of Basic Medical Sciences, Guangxi Medical University, Nanning, Guangxi, China
| | - Shuai Chen
- Center for Translational Medicine, Key Laboratory of Longevity and Aging-related Diseases of Chinese Ministry of Education, Institute of Neuroscience and Guangxi Key Laboratory of Brain Science, School of Basic Medical Sciences, Guangxi Medical University, Nanning, Guangxi, China
| | - Lihui Wang
- Center for Translational Medicine, Key Laboratory of Longevity and Aging-related Diseases of Chinese Ministry of Education, Institute of Neuroscience and Guangxi Key Laboratory of Brain Science, School of Basic Medical Sciences, Guangxi Medical University, Nanning, Guangxi, China
| | - Jinling Liao
- Center for Genomic and Personalized Medicine, Guangxi Medical University, Nanning, Guangxi, China
| | - Chunlin Zou
- Center for Translational Medicine, Key Laboratory of Longevity and Aging-related Diseases of Chinese Ministry of Education, Institute of Neuroscience and Guangxi Key Laboratory of Brain Science, School of Basic Medical Sciences, Guangxi Medical University, Nanning, Guangxi, China.
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Choi I, Jeon Y, Pai HS. Brix protein APPAN plays a role in ribosomal RNA processing in Arabidopsis. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2023; 333:111721. [PMID: 37146691 DOI: 10.1016/j.plantsci.2023.111721] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2022] [Revised: 04/24/2023] [Accepted: 04/25/2023] [Indexed: 05/07/2023]
Abstract
Arabidopsis APPAN is a Brix family protein that is homologous to yeast Ssf1/Ssf2 and PPan in higher eukaryotes. A previous study, mostly based on physiological experiments, revealed that APPAN plays an essential role in female gametogenesis in plants. Here, we investigated cellular functions of APPAN, which could be the molecular basis for developmental defects in snail1/appan mutants. Virus-induced gene silencing (VIGS) of APPAN in Arabidopsis resulted in abnormal shoot apices, leading to defective inflorescences and malformed flowers and leaves. APPAN is localized in the nucleolus and co-sedimented mainly with 60S ribosome subunit. RNA gel blot analyses showed overaccumulation of processing intermediates, particularly 35S and P-A3, and the sequences were confirmed by circular RT-PCR. These results suggested that silencing of APPAN causes defective pre-rRNA processing. Metabolic rRNA labeling showed that APPAN depletion mainly reduced 25S rRNA synthesis. Consistently, based on the ribosome profiling, the levels of 60S/80S ribosomes were significantly reduced. Finally, APPAN deficiency caused nucleolar stress with abnormal nucleolar morphology and translocation of nucleolar proteins into the nucleoplasm. Collectively, these results suggest that APPAN plays a crucial role in plant rRNA processing and ribosome biogenesis, and its depletion disrupts plant growth and development.
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Affiliation(s)
- Ilyeong Choi
- Department of Systems Biology, Yonsei University, Seoul 03722, Korea.
| | - Young Jeon
- Department of Systems Biology, Yonsei University, Seoul 03722, Korea; Laboratory of Veterinary Toxicology, College of Veterinary Medicine, Seoul National University, Seoul 08826, Korea.
| | - Hyun-Sook Pai
- Department of Systems Biology, Yonsei University, Seoul 03722, Korea.
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Daware A, Malik A, Srivastava R, Das D, Ellur RK, Singh AK, Tyagi AK, Parida SK. Rice Pangenome Genotyping Array: an efficient genotyping solution for pangenome-based accelerated genetic improvement in rice. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2023; 113:26-46. [PMID: 36377929 DOI: 10.1111/tpj.16028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2022] [Revised: 10/13/2022] [Accepted: 10/29/2022] [Indexed: 06/16/2023]
Abstract
The advent of the pangenome era has unraveled previously unknown genetic variation existing within diverse crop plants, including rice. This untapped genetic variation is believed to account for a major portion of phenotypic variation existing in crop plants. However, the use of conventional single reference-guided genotyping often fails to capture a large portion of this genetic variation leading to a reference bias. This makes it difficult to identify and utilize novel population/cultivar-specific genes for crop improvement. Thus, we developed a Rice Pangenome Genotyping Array (RPGA) harboring probes assaying 80K single-nucleotide polymorphisms (SNPs) and presence-absence variants spanning the entire 3K rice pangenome. This array provides a simple, user-friendly and cost-effective (60-80 USD per sample) solution for rapid pangenome-based genotyping in rice. The genome-wide association study (GWAS) conducted using RPGA-SNP genotyping data of a rice diversity panel detected a total of 42 loci, including previously known as well as novel genomic loci regulating grain size/weight traits in rice. Eight of these identified trait-associated loci (dispensable loci) could not be detected with conventional single reference genome-based GWAS. A WD repeat-containing PROTEIN 12 gene underlying one of such dispensable locus on chromosome 7 (qLWR7) along with other non-dispensable loci were subsequently detected using high-resolution quantitative trait loci mapping confirming authenticity of RPGA-led GWAS. This demonstrates the potential of RPGA-based genotyping to overcome reference bias. The application of RPGA-based genotyping for population structure analysis, hybridity testing, ultra-high-density genetic map construction and chromosome-level genome assembly, and marker-assisted selection was also demonstrated. A web application (http://www.rpgaweb.com) was further developed to provide an easy to use platform for the imputation of RPGA-based genotyping data using 3K rice reference panel and subsequent GWAS.
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Affiliation(s)
- Anurag Daware
- National Institute of Plant Genome Research (NIPGR), Aruna Asaf Ali Marg, New Delhi, 110067, India
| | - Ankit Malik
- Division of Genetics, Rice Section, Indian Agricultural Research Institute (IARI), New Delhi, 110012, India
| | - Rishi Srivastava
- National Institute of Plant Genome Research (NIPGR), Aruna Asaf Ali Marg, New Delhi, 110067, India
| | - Durdam Das
- National Institute of Plant Genome Research (NIPGR), Aruna Asaf Ali Marg, New Delhi, 110067, India
| | - Ranjith K Ellur
- Division of Genetics, Rice Section, Indian Agricultural Research Institute (IARI), New Delhi, 110012, India
| | - Ashok K Singh
- Division of Genetics, Rice Section, Indian Agricultural Research Institute (IARI), New Delhi, 110012, India
| | - Akhilesh K Tyagi
- National Institute of Plant Genome Research (NIPGR), Aruna Asaf Ali Marg, New Delhi, 110067, India
- Interdisciplinary Centre for Plant Genomics and Department of Plant Molecular Biology, University of Delhi South Campus, New Delhi, 110021, India
| | - Swarup K Parida
- National Institute of Plant Genome Research (NIPGR), Aruna Asaf Ali Marg, New Delhi, 110067, India
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Wang Y, Sun Z, Wang L, Chen L, Ma L, Lv J, Qiao K, Fan S, Ma Q. GhBOP1 as a Key Factor of Ribosomal Biogenesis: Development of Wrinkled Leaves in Upland Cotton. Int J Mol Sci 2022; 23:ijms23179942. [PMID: 36077339 PMCID: PMC9456263 DOI: 10.3390/ijms23179942] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2022] [Revised: 08/25/2022] [Accepted: 08/29/2022] [Indexed: 11/16/2022] Open
Abstract
Block of proliferation 1 (BOP1) is a key protein that helps in the maturation of ribosomes and promotes the progression of the cell cycle. However, its role in the leaf morphogenesis of cotton remains unknown. Herein, we report and study the function of GhBOP1 isolated from Gossypium hirsutum. The sequence alignment revealed that BOP1 protein was highly conserved among different species. The yeast two-hybrid experiments, bimolecular fluorescence complementation, and luciferase complementation techniques revealed that GhBOP1 interact with GhPES and GhWDR12. Subcellular localization experiments revealed that GhBOP1, GhPES and GhWDR12 were localized at the nucleolus. Suppression of GhBOP1 transcripts resulted in the uneven bending of leaf margins and the presence of young wrinkled leaves by virus-induced gene silencing assay. Abnormal palisade arrangements and the presence of large upper epidermal cells were observed in the paraffin sections of the wrinkled leaves. Meanwhile, a jasmonic acid-related gene, GhOPR3, expression was increased. In addition, a negative effect was exerted on the cell cycle and the downregulation of the auxin-related genes was also observed. These results suggest that GhBOP1 plays a critical role in the development of wrinkled cotton leaves, and the process is potentially modulated through phytohormone signaling.
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Affiliation(s)
- Yanwen Wang
- State Key Laboratory of Cotton Biology, Institute of Cotton Research of Chinese Academy of Agricultural Sciences, Anyang 455099, China
| | - Zhimao Sun
- College of Life Sciences, Shaanxi Normal University, Xi’an 710062, China
| | - Long Wang
- State Key Laboratory of Cotton Biology, Institute of Cotton Research of Chinese Academy of Agricultural Sciences, Anyang 455099, China
| | - Lingling Chen
- State Key Laboratory of Cotton Biology, Institute of Cotton Research of Chinese Academy of Agricultural Sciences, Anyang 455099, China
| | - Lina Ma
- State Key Laboratory of Cotton Biology, Institute of Cotton Research of Chinese Academy of Agricultural Sciences, Anyang 455099, China
| | - Jiaoyan Lv
- State Key Laboratory of Cotton Biology, Institute of Cotton Research of Chinese Academy of Agricultural Sciences, Anyang 455099, China
| | - Kaikai Qiao
- State Key Laboratory of Cotton Biology, Institute of Cotton Research of Chinese Academy of Agricultural Sciences, Anyang 455099, China
| | - Shuli Fan
- State Key Laboratory of Cotton Biology, Institute of Cotton Research of Chinese Academy of Agricultural Sciences, Anyang 455099, China
- Hainan Yazhou Bay Seed Lab, Sanya 572000, China
- National Nanfan Research Institute (Sanya), Chinese Academy of Agricultural Sciences, Sanya 572000, China
- Correspondence: (S.F.); (Q.M.)
| | - Qifeng Ma
- State Key Laboratory of Cotton Biology, Institute of Cotton Research of Chinese Academy of Agricultural Sciences, Anyang 455099, China
- Correspondence: (S.F.); (Q.M.)
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Mi L, Qi Q, Ran H, Chen L, Li D, Xiao D, Wu J, Cai Y, Zhang S, Li Y, Li B, Xie J, Huang H, Li T, Zhou T, Li A, Qi J, Li F, Man J. Suppression of Ribosome Biogenesis by Targeting WD Repeat Domain 12 (WDR12) Inhibits Glioma Stem-Like Cell Growth. Front Oncol 2021; 11:751792. [PMID: 34868955 PMCID: PMC8633585 DOI: 10.3389/fonc.2021.751792] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2021] [Accepted: 10/26/2021] [Indexed: 01/05/2023] Open
Abstract
Glioma stem-like cells (GSCs) are a subset of tumor cells that initiate malignant growth and promote the therapeutic resistance of glioblastoma, the most lethal primary brain tumor. Ribosome biogenesis is an essential cellular process to maintain cell growth, but its regulatory mechanism in GSCs remains largely unknown. Here, we show that WD repeat domain 12 (WDR12), a component of the Pes1-Bop1 complex (PeBoW), is required for ribosome biogenesis in GSCs. WDR12 is preferentially expressed in GSCs compared to non-stem tumor cells and normal brain cells. High levels of WDR12 are associated with glioblastoma progression and poor prognosis. Silencing WDR12 results in the degradation of PeBoW complex components and prevents the maturation of 28S rRNA, thereby inhibiting ribosome biogenesis in GSCs. Subsequently, WDR12 depletion compromises GSC proliferation, inhibits GSC-derived orthotopic tumor growth, and extends animal survival. Together, our results suggest that WDR12 is crucial for ribosome biogenesis in GSCs, and is thus a potential target for GSC-directed therapy of glioblastoma.
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Affiliation(s)
- Lanjuan Mi
- State Key Laboratory of Proteomics, National Center of Biomedical Analysis, Beijing, China
| | - Qinghui Qi
- State Key Laboratory of Proteomics, National Center of Biomedical Analysis, Beijing, China
| | - Haowen Ran
- State Key Laboratory of Proteomics, National Center of Biomedical Analysis, Beijing, China
| | - Lishu Chen
- State Key Laboratory of Proteomics, National Center of Biomedical Analysis, Beijing, China
| | - Da Li
- State Key Laboratory of Proteomics, National Center of Biomedical Analysis, Beijing, China
| | - Dake Xiao
- State Key Laboratory of Proteomics, National Center of Biomedical Analysis, Beijing, China
| | - Jiaqi Wu
- State Key Laboratory of Proteomics, National Center of Biomedical Analysis, Beijing, China
| | - Yan Cai
- State Key Laboratory of Proteomics, National Center of Biomedical Analysis, Beijing, China
| | - Songyang Zhang
- State Key Laboratory of Proteomics, National Center of Biomedical Analysis, Beijing, China
| | - Yuanyuan Li
- State Key Laboratory of Proteomics, National Center of Biomedical Analysis, Beijing, China
| | - Bohan Li
- Department of Neurosurgery, Beijing Fengtai Hospital, Beijing, China
| | - Jiong Xie
- Department of Neurosurgery, Beijing Fengtai Hospital, Beijing, China
| | - Haohao Huang
- Department of Neurosurgery, General Hospital of Central Theater Command of Chinese People's Liberation Army, Wuhan, China
| | - Tao Li
- State Key Laboratory of Proteomics, National Center of Biomedical Analysis, Beijing, China
| | - Tao Zhou
- State Key Laboratory of Proteomics, National Center of Biomedical Analysis, Beijing, China
| | - Ailing Li
- State Key Laboratory of Proteomics, National Center of Biomedical Analysis, Beijing, China
| | - Ji Qi
- Department of Neurosurgery, Beijing Fengtai Hospital, Beijing, China
| | - Fangye Li
- Department of Neurosurgery, First Medical Center of PLA General Hospital, Beijing, China
| | - Jianghong Man
- State Key Laboratory of Proteomics, National Center of Biomedical Analysis, Beijing, China
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In Leishmania major, the Homolog of the Oncogene PES1 May Play a Critical Role in Parasite Infectivity. Int J Mol Sci 2021; 22:ijms222212592. [PMID: 34830469 PMCID: PMC8618447 DOI: 10.3390/ijms222212592] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Revised: 11/14/2021] [Accepted: 11/15/2021] [Indexed: 01/09/2023] Open
Abstract
Leishmaniasis is a neglected tropical disease caused by Leishmania spp. The improvement of existing treatments and the discovery of new drugs remain ones of the major goals in control and eradication of this disease. From the parasite genome, we have identified the homologue of the human oncogene PES1 in Leishmania major (LmjPES). It has been demonstrated that PES1 is involved in several processes such as ribosome biogenesis, cell proliferation and genetic transcription. Our phylogenetic studies showed that LmjPES encodes a highly conserved protein containing three main domains: PES N-terminus (shared with proteins involved in ribosomal biogenesis), BRCT (found in proteins related to DNA repair processes) and MAEBL-type domain (C-terminus, related to erythrocyte invasion in apicomplexan). This gene showed its highest expression level in metacyclic promastigotes, the infective forms; by fluorescence microscopy assay, we demonstrated the nuclear localization of LmjPES protein. After generating mutant parasites overexpressing LmjPES, we observed that these clones displayed a dramatic increase in the ratio of cell infection within macrophages. Furthermore, BALB/c mice infected with these transgenic parasites exhibited higher footpad inflammation compared to those inoculated with non-overexpressing parasites.
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BOP1 Used as a Novel Prognostic Marker and Correlated with Tumor Microenvironment in Pan-Cancer. JOURNAL OF ONCOLOGY 2021; 2021:3603030. [PMID: 34603446 PMCID: PMC8481050 DOI: 10.1155/2021/3603030] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/02/2021] [Revised: 08/24/2021] [Accepted: 09/04/2021] [Indexed: 01/18/2023]
Abstract
Previous studies have indicated the important role of block of proliferation 1 (BOP1) in the progression of several malignant tumors; no comprehensive pan-cancer analysis of BOP1 has been performed. Here, we aim to systematically identify the expression, prognostic value, and potential immunological functions of BOP1 in 33 malignancies. We obtained the gene expression data and clinical information from multiple public databases to assess the expression level and prognostic value of BOP1 in 33 cancers. We also analyzed the relationship between BOP1 expression and DNA methylation, tumor microenvironment (TME), microsatellite instability (MSI), tumor mutational burden (TMB), and immune checkpoints. Moreover, we conducted gene set enrichment analysis (GSEA) to investigate the biological function and signal transduction pathways of BOP1 in different types of tumors. Finally, we validated the expression of BOP1 in lung cancer cell line and detected the influence of BOP1 on lung cancer cell migration and the expression of epithelial-mesenchymal transition- (EMT-) related genes. Collectively, our findings elucidated that BOP1 has the potential to be a promising molecular prognostic biomarker for predicting poor survival in various malignant tumors, as well as a cancer-promoting gene involved in tumorigenesis and tumor immunity.
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Bassal M, Abukhalaf M, Majovsky P, Thieme D, Herr T, Ayash M, Tabassum N, Al Shweiki MR, Proksch C, Hmedat A, Ziegler J, Lee J, Neumann S, Hoehenwarter W. Reshaping of the Arabidopsis thaliana Proteome Landscape and Co-regulation of Proteins in Development and Immunity. MOLECULAR PLANT 2020; 13:1709-1732. [PMID: 33007468 DOI: 10.1016/j.molp.2020.09.024] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2020] [Revised: 08/21/2020] [Accepted: 09/25/2020] [Indexed: 05/21/2023]
Abstract
Proteome remodeling is a fundamental adaptive response, and proteins in complexes and functionally related proteins are often co-expressed. Using a deep sampling strategy we define core proteomes of Arabidopsis thaliana tissues with around 10 000 proteins per tissue, and absolutely quantify (copy numbers per cell) nearly 16 000 proteins throughout the plant lifecycle. A proteome-wide survey of global post-translational modification revealed amino acid exchanges pointing to potential conservation of translational infidelity in eukaryotes. Correlation analysis of protein abundance uncovered potentially new tissue- and age-specific roles of entire signaling modules regulating transcription in photosynthesis, seed development, and senescence and abscission. Among others, the data suggest a potential function of RD26 and other NAC transcription factors in seed development related to desiccation tolerance as well as a possible function of cysteine-rich receptor-like kinases (CRKs) as ROS sensors in senescence. All of the components of ribosome biogenesis factor (RBF) complexes were found to be co-expressed in a tissue- and age-specific manner, indicating functional promiscuity in the assembly of these less-studied protein complexes in Arabidopsis.Furthermore, we characterized detailed proteome remodeling in basal immunity by treating Arabidopsis seeldings with flg22. Through simultaneously monitoring phytohormone and transcript changes upon flg22 treatment, we obtained strong evidence of suppression of jasmonate (JA) and JA-isoleucine (JA-Ile) levels by deconjugation and hydroxylation by IAA-ALA RESISTANT3 (IAR3) and JASMONATE-INDUCED OXYGENASE 2 (JOX2), respectively, under the control of JASMONATE INSENSITIVE 1 (MYC2), suggesting an unrecognized role of a new JA regulatory switch in pattern-triggered immunity. Taken together, the datasets generated in this study present extensive coverage of the Arabidopsis proteome in various biological scenarios, providing a rich resource available to the whole plant science community.
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Affiliation(s)
- Mona Bassal
- Leibniz Institute of Plant Biochemistry, Biochemistry of Plant Interactions Department, Proteome Biology of Plant Interactions Research Group, Weinberg 3, Halle/Saale D-06120, Germany
| | - Mohammad Abukhalaf
- Leibniz Institute of Plant Biochemistry, Biochemistry of Plant Interactions Department, Proteome Biology of Plant Interactions Research Group, Weinberg 3, Halle/Saale D-06120, Germany
| | - Petra Majovsky
- Leibniz Institute of Plant Biochemistry, Biochemistry of Plant Interactions Department, Proteome Biology of Plant Interactions Research Group, Weinberg 3, Halle/Saale D-06120, Germany
| | - Domenika Thieme
- Leibniz Institute of Plant Biochemistry, Biochemistry of Plant Interactions Department, Proteome Biology of Plant Interactions Research Group, Weinberg 3, Halle/Saale D-06120, Germany
| | - Tobias Herr
- Leibniz Institute of Plant Biochemistry, Biochemistry of Plant Interactions Department, Proteome Biology of Plant Interactions Research Group, Weinberg 3, Halle/Saale D-06120, Germany
| | - Mohamed Ayash
- Leibniz Institute of Plant Biochemistry, Biochemistry of Plant Interactions Department, Proteome Biology of Plant Interactions Research Group, Weinberg 3, Halle/Saale D-06120, Germany
| | - Naheed Tabassum
- Leibniz Institute of Plant Biochemistry, Biochemistry of Plant Interactions Department, Proteome Biology of Plant Interactions Research Group, Weinberg 3, Halle/Saale D-06120, Germany
| | - Mhd Rami Al Shweiki
- Leibniz Institute of Plant Biochemistry, Biochemistry of Plant Interactions Department, Proteome Biology of Plant Interactions Research Group, Weinberg 3, Halle/Saale D-06120, Germany
| | - Carsten Proksch
- Leibniz Institute of Plant Biochemistry, Biochemistry of Plant Interactions Department, Proteome Biology of Plant Interactions Research Group, Weinberg 3, Halle/Saale D-06120, Germany
| | - Ali Hmedat
- Leibniz Institute of Plant Biochemistry, Biochemistry of Plant Interactions Department, Proteome Biology of Plant Interactions Research Group, Weinberg 3, Halle/Saale D-06120, Germany
| | - Jörg Ziegler
- Leibniz Institute of Plant Biochemistry, Biochemistry of Plant Interactions Department, Proteome Biology of Plant Interactions Research Group, Weinberg 3, Halle/Saale D-06120, Germany
| | - Justin Lee
- Leibniz Institute of Plant Biochemistry, Biochemistry of Plant Interactions Department, Proteome Biology of Plant Interactions Research Group, Weinberg 3, Halle/Saale D-06120, Germany
| | - Steffen Neumann
- Leibniz Institute of Plant Biochemistry, Biochemistry of Plant Interactions Department, Proteome Biology of Plant Interactions Research Group, Weinberg 3, Halle/Saale D-06120, Germany
| | - Wolfgang Hoehenwarter
- Leibniz Institute of Plant Biochemistry, Biochemistry of Plant Interactions Department, Proteome Biology of Plant Interactions Research Group, Weinberg 3, Halle/Saale D-06120, Germany.
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Determining the Clinical Value and Critical Pathway of GTPBP4 in Lung Adenocarcinoma Using a Bioinformatics Strategy: A Study Based on Datasets from The Cancer Genome Atlas. BIOMED RESEARCH INTERNATIONAL 2020; 2020:5171242. [PMID: 33134380 PMCID: PMC7593728 DOI: 10.1155/2020/5171242] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/04/2020] [Revised: 08/17/2020] [Accepted: 08/24/2020] [Indexed: 01/16/2023]
Abstract
Lung cancer is the leading cause of cancer-related death worldwide, and the most common histologic subtype is lung adenocarcinoma (LUAD). Due to the significant mortality and morbidity rates among patients with LUAD, the identification of novel biomarkers to guide diagnosis, prognosis, and therapy is urgent. Guanosine triphosphate-binding protein 4 (GTPBP4) has been found to be associated with tumorigenesis in recent years, but the underlying molecular mechanism remains to be elucidated. In the present study, we demonstrate that GTPBP4 is significantly overexpressed in LUAD primary tumors. A total of 55 genes were identified as potential targets of GTPBP4. GO enrichment analysis identified the top 25 pathways among these target genes, among which, ribosome biogenesis was shown to be the most central. Each target gene demonstrated strong and complex interactions with other genes. Of the potential target genes, 12 abnormally expressed candidates were associated with survival probability and correlated with GTPBP4 expression. These findings suggest that GTPBP4 is associated with LUAD progression. Finally, we highlight the importance of the role of GTPBP4 in LUAD in vitro. GTPBP4 knockdown in LUAD cells inhibited proliferation and metastasis, promoted apoptosis, and enhanced sensitivity to TP. Overall, we conclude that GTPBP4 may be considered as a potential biomarker of LUAD.
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Choi I, Jeon Y, Yoo Y, Cho HS, Pai HS. The in vivo functions of ARPF2 and ARRS1 in ribosomal RNA processing and ribosome biogenesis in Arabidopsis. JOURNAL OF EXPERIMENTAL BOTANY 2020; 71:2596-2611. [PMID: 32275312 DOI: 10.1093/jxb/eraa019] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2019] [Accepted: 04/08/2020] [Indexed: 06/11/2023]
Abstract
Yeast Rpf2 plays a critical role in the incorporation of 5S rRNA into pre-ribosomes by forming a binary complex with Rrs1. The protein characteristics and overexpression phenotypes of Arabidopsis Ribosome Production Factor 2 (ARPF2) and Arabidopsis Regulator of Ribosome Synthesis 1 (ARRS1) have been previously studied. Here, we analyze loss-of-function phenotypes of ARPF2 and ARRS1 using virus-induced gene silencing to determine their functions in pre-rRNA processing and ribosome biogenesis. ARPF2 silencing in Arabidopsis led to pleiotropic developmental defects. RNA gel blot analysis and circular reverse transcription-PCR revealed that ARPF2 depletion delayed pre-rRNA processing, resulting in the accumulation of multiple processing intermediates. ARPF2 fractionated primarily with the 60S ribosomal subunit. Metabolic rRNA labeling and ribosome profiling suggested that ARPF2 deficiency mainly affected 25S rRNA synthesis and 60S ribosome biogenesis. ARPF2 and ARRS1 formed the complex that interacted with the 60S ribosomal proteins RPL5 and RPL11. ARRS1 silencing resulted in growth defects, accumulation of processing intermediates, and ribosome profiling similar to those of ARPF2-silenced plants. Moreover, depletion of ARPF2 and ARRS1 caused nucleolar stress. ARPF2-deficient plants excessively accumulated anthocyanin and reactive oxygen species. Collectively, these results suggest that the ARPF2-ARRS1 complex plays a crucial role in plant growth and development by modulating ribosome biogenesis.
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Affiliation(s)
- Ilyeong Choi
- Department of Systems Biology, Yonsei University, Seoul, Korea
| | - Young Jeon
- Department of Systems Biology, Yonsei University, Seoul, Korea
| | - Youngki Yoo
- Department of Systems Biology, Yonsei University, Seoul, Korea
| | - Hyun-Soo Cho
- Department of Systems Biology, Yonsei University, Seoul, Korea
| | - Hyun-Sook Pai
- Department of Systems Biology, Yonsei University, Seoul, Korea
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15
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Li JL, Chen C, Chen W, Zhao LF, Xu XK, Li Y, Yuan HY, Lin JR, Pan JP, Jin BL, Li FC. Integrative genomic analyses identify WDR12 as a novel oncogene involved in glioblastoma. J Cell Physiol 2020; 235:7344-7355. [PMID: 32180229 DOI: 10.1002/jcp.29635] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2019] [Accepted: 01/09/2020] [Indexed: 01/16/2023]
Abstract
Glioblastoma (GBM) is the most malignant primary brain tumor in adults. Due to its invasive nature, it cannot be thoroughly eliminated. WD repeat domain 12 (WDR12) processes the 32S precursor rRNA but cannot affect the synthesis of the 45S/47S primary transcript. In this study, we found that WDR12 is highly expressed in GBM according to the analysis results of mRNA expression by The Cancer Genome Atlas database. The high expression level of WDR12 is dramatically related to shorter overall survival and reduced disease-free survival. Next, we knocked down WDR12 and found that knockdown of WDR12 promoted the apoptosis and inhibited the proliferation by cell biology experiments. Differential expression genes in gene-chip revealed that WDR12 knockdown mainly inhibited cell cycle. Finally, we also found that WDR12 is associated with PLK1 and EZH2 in cell proliferation of GBM. Resumptively, this report showed a possible evidence that WDR12 drove malignant behavior of GBM, whose expression may present a neoteric independent prognostic biomarker in GBM.
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Affiliation(s)
- Jun-Liang Li
- Department of Neurosurgery, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, China.,Department of Neurosurgery, Guangzhou Women and Children's Medical Center, Guangzhou, China.,Guangdong Provincial Key Laboratory of Research in Structural Birth Defect Disease, Guangzhou Women and Children's Medical Center, Guangzhou, China
| | - Cheng Chen
- Department of Neurosurgery, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, China.,Department of Neurosurgery, Guangzhou Women and Children's Medical Center, Guangzhou, China.,Guangdong Provincial Key Laboratory of Research in Structural Birth Defect Disease, Guangzhou Women and Children's Medical Center, Guangzhou, China
| | - Wei Chen
- Department of Neurosurgery, Guangzhou Women and Children's Medical Center, Guangzhou, China.,Guangdong Provincial Key Laboratory of Research in Structural Birth Defect Disease, Guangzhou Women and Children's Medical Center, Guangzhou, China
| | - Ling-Feng Zhao
- Department of Neurosurgery, Guangzhou Women and Children's Medical Center, Guangzhou, China.,Guangdong Provincial Key Laboratory of Research in Structural Birth Defect Disease, Guangzhou Women and Children's Medical Center, Guangzhou, China
| | - Xin-Ke Xu
- Department of Neurosurgery, Guangzhou Women and Children's Medical Center, Guangzhou, China.,Guangdong Provincial Key Laboratory of Research in Structural Birth Defect Disease, Guangzhou Women and Children's Medical Center, Guangzhou, China
| | - Yang Li
- Department of Neurosurgery, Guangzhou Women and Children's Medical Center, Guangzhou, China.,Guangdong Provincial Key Laboratory of Research in Structural Birth Defect Disease, Guangzhou Women and Children's Medical Center, Guangzhou, China
| | - Hong-Yao Yuan
- Department of Neurosurgery, Guangzhou Women and Children's Medical Center, Guangzhou, China.,Guangdong Provincial Key Laboratory of Research in Structural Birth Defect Disease, Guangzhou Women and Children's Medical Center, Guangzhou, China
| | - Jin-Rong Lin
- Department of Neurosurgery, Guangzhou Women and Children's Medical Center, Guangzhou, China.,Guangdong Provincial Key Laboratory of Research in Structural Birth Defect Disease, Guangzhou Women and Children's Medical Center, Guangzhou, China
| | - Jun-Ping Pan
- Department of Neurosurgery, Guangzhou Women and Children's Medical Center, Guangzhou, China.,Guangdong Provincial Key Laboratory of Research in Structural Birth Defect Disease, Guangzhou Women and Children's Medical Center, Guangzhou, China
| | - Bi-Lian Jin
- Department of Neurosurgery, Guangzhou Women and Children's Medical Center, Guangzhou, China.,Guangdong Provincial Key Laboratory of Research in Structural Birth Defect Disease, Guangzhou Women and Children's Medical Center, Guangzhou, China
| | - Fang-Cheng Li
- Department of Neurosurgery, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, China.,Department of Neurosurgery, Guangzhou Women and Children's Medical Center, Guangzhou, China.,Guangdong Provincial Key Laboratory of Research in Structural Birth Defect Disease, Guangzhou Women and Children's Medical Center, Guangzhou, China
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16
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Sáez-Vásquez J, Delseny M. Ribosome Biogenesis in Plants: From Functional 45S Ribosomal DNA Organization to Ribosome Assembly Factors. THE PLANT CELL 2019; 31:1945-1967. [PMID: 31239391 PMCID: PMC6751116 DOI: 10.1105/tpc.18.00874] [Citation(s) in RCA: 93] [Impact Index Per Article: 18.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2018] [Revised: 05/28/2019] [Accepted: 06/25/2019] [Indexed: 05/11/2023]
Abstract
The transcription of 18S, 5.8S, and 18S rRNA genes (45S rDNA), cotranscriptional processing of pre-rRNA, and assembly of mature rRNA with ribosomal proteins are the linchpins of ribosome biogenesis. In yeast (Saccharomyces cerevisiae) and animal cells, hundreds of pre-rRNA processing factors have been identified and their involvement in ribosome assembly determined. These studies, together with structural analyses, have yielded comprehensive models of the pre-40S and pre-60S ribosome subunits as well as the largest cotranscriptionally assembled preribosome particle: the 90S/small subunit processome. Here, we present the current knowledge of the functional organization of 45S rDNA, pre-rRNA transcription, rRNA processing activities, and ribosome assembly factors in plants, focusing on data from Arabidopsis (Arabidopsis thaliana). Based on yeast and mammalian cell studies, we describe the ribonucleoprotein complexes and RNA-associated activities and discuss how they might specifically affect the production of 40S and 60S subunits. Finally, we review recent findings concerning pre-rRNA processing pathways and a novel mechanism involved in a ribosome stress response in plants.
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Affiliation(s)
- Julio Sáez-Vásquez
- CNRS, Laboratoire Génome et Développement des Plantes, UMR 5096, 66860 Perpignan, France, and Universite Perpignan Via Domitia, Laboratoire Génome et Développement des Plantes, UMR 5096, F-66860 Perpignan, France
| | - Michel Delseny
- CNRS, Laboratoire Génome et Développement des Plantes, UMR 5096, 66860 Perpignan, France, and Universite Perpignan Via Domitia, Laboratoire Génome et Développement des Plantes, UMR 5096, F-66860 Perpignan, France
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17
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Palm D, Streit D, Shanmugam T, Weis BL, Ruprecht M, Simm S, Schleiff E. Plant-specific ribosome biogenesis factors in Arabidopsis thaliana with essential function in rRNA processing. Nucleic Acids Res 2019; 47:1880-1895. [PMID: 30576513 PMCID: PMC6393314 DOI: 10.1093/nar/gky1261] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2018] [Revised: 12/04/2018] [Accepted: 12/18/2018] [Indexed: 12/22/2022] Open
Abstract
rRNA processing and assembly of ribosomal proteins during maturation of ribosomes involve many ribosome biogenesis factors (RBFs). Recent studies identified differences in the set of RBFs in humans and yeast, and the existence of plant-specific RBFs has been proposed as well. To identify such plant-specific RBFs, we characterized T-DNA insertion mutants of 15 Arabidopsis thaliana genes encoding nuclear proteins with nucleotide binding properties that are not orthologues to yeast or human RBFs. Mutants of nine genes show an altered rRNA processing ranging from inhibition of initial 35S pre-rRNA cleavage to final maturation events like the 6S pre-rRNA processing. These phenotypes led to their annotation as 'involved in rRNA processing' - IRP. The irp mutants are either lethal or show developmental and stress related phenotypes. We identified IRPs for maturation of the plant-specific precursor 5'-5.8S and one affecting the pathway with ITS2 first cleavage of the 35S pre-rRNA transcript. Moreover, we realized that 5'-5.8S processing is essential, while a mutant causing 6S accumulation shows only a weak phenotype. Thus, we demonstrate the importance of the maturation of the plant-specific precursor 5'-5.8S for plant development as well as the occurrence of an ITS2 first cleavage pathway in fast dividing tissues.
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Affiliation(s)
- Denise Palm
- Institute for Molecular Biosciences, Goethe University Frankfurt, Max von Laue Str. 9, D-60438 Frankfurt, Germany
| | - Deniz Streit
- Institute for Molecular Biosciences, Goethe University Frankfurt, Max von Laue Str. 9, D-60438 Frankfurt, Germany
| | - Thiruvenkadam Shanmugam
- Institute for Molecular Biosciences, Goethe University Frankfurt, Max von Laue Str. 9, D-60438 Frankfurt, Germany
| | - Benjamin L Weis
- Institute for Molecular Biosciences, Goethe University Frankfurt, Max von Laue Str. 9, D-60438 Frankfurt, Germany
| | - Maike Ruprecht
- Institute for Molecular Biosciences, Goethe University Frankfurt, Max von Laue Str. 9, D-60438 Frankfurt, Germany
| | - Stefan Simm
- Institute for Molecular Biosciences, Goethe University Frankfurt, Max von Laue Str. 9, D-60438 Frankfurt, Germany
- Frankfurt Institute for Advanced Studies, D-60438 Frankfurt, Germany
| | - Enrico Schleiff
- Institute for Molecular Biosciences, Goethe University Frankfurt, Max von Laue Str. 9, D-60438 Frankfurt, Germany
- Frankfurt Institute for Advanced Studies, D-60438 Frankfurt, Germany
- Buchmann Institute for Molecular Life Sciences, Goethe University Frankfurt, D-60438 Frankfurt, Germany
- To whom correspondence should be addressed. Tel: +49 69 798 29285; Fax: +49 69 798 29286;
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Abnormal Ribosome Biogenesis Partly Induced p53-Dependent Aortic Medial Smooth Muscle Cell Apoptosis and Oxidative Stress. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2019; 2019:7064319. [PMID: 31210846 PMCID: PMC6532287 DOI: 10.1155/2019/7064319] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/17/2018] [Revised: 03/30/2019] [Accepted: 04/14/2019] [Indexed: 12/19/2022]
Abstract
Ribosome biogenesis is a crucial biological process related to cell proliferation, redox balance, and muscle contractility. Aortic smooth muscle cells (ASMCs) show inhibition of proliferation and apoptosis, along with high levels of oxidative stress in aortic dissection (AD). Theoretically, ribosome biogenesis should be enhanced in the ASMCs at its proliferative state but suppressed during apoptosis and oxidative stress. However, the exact status and role of ribosome biogenesis in AD are unknown. We therefore analyzed the expression levels of BOP1, a component of the PeBoW complex which is crucial to ribosome biogenesis, in AD patients and a murine AD model and its influence on the ASMCs. BOP1 was downregulated in the aortic tissues of AD patients compared to healthy donors. In addition, overexpression of BOP1 in human aortic smooth muscle cells (HASMCs) inhibited apoptosis and accumulation of p53 under hypoxic conditions, while knockdown of BOP1 decreased the protein synthesis rate and motility of HASMCs. The RNA polymerase I inhibitor cx-5461 induced apoptosis, ROS production, and proliferative inhibition in the HASMCs, which was partly attenuated by p53 knockout. Furthermore, cx-5461 aggravated the severity of AD in vivo, but a p53-/- background extended the life-span and lowered AD incidence in the mice. Taken together, decreased ribosome biogenesis in ASMCs resulting in p53-dependent proliferative inhibition, oxidative stress, and apoptosis is one of the underlying mechanisms of AD.
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Li PC, Li K, Wang J, Zhao CZ, Zhao SZ, Hou L, Xia H, Ma CL, Wang XJ. The AAA-ATPase MIDASIN 1 Functions in Ribosome Biogenesis and Is Essential for Embryo and Root Development. PLANT PHYSIOLOGY 2019; 180:289-304. [PMID: 30755475 PMCID: PMC6501072 DOI: 10.1104/pp.18.01225] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2018] [Accepted: 01/30/2019] [Indexed: 05/04/2023]
Abstract
Ribosome biogenesis is an orchestrated process that relies on many assembly factors. The AAA-ATPase Midasin 1 (Mdn1) functions as a ribosome assembly factor in yeast (Saccharomyces cerevisiae), but the roles of MDN1 in Arabidopsis (Arabidopsis thaliana) are poorly understood. Here, we showed that the Arabidopsis null mutant of MDN1 is embryo-lethal. Using the weak mutant mdn1-1, which maintains viability, we found that MDN1 is critical for the regular pattern of auxin maxima in the globular embryo and functions in root meristem maintenance. By detecting the subcellular distribution of ribosome proteins, we noted that mdn1-1 impairs nuclear export of the pre-60S ribosomal particle. The processing of ribosomal precusor RNAs, including 35S, 27SB, and 20S, is also affected in this mutant. MDN1 physically interacts with PESCADILLO2 (PES2), an essential assembly factor of the 60S ribosome, and the observed mislocalization of PES2 in mdn1-1 further implied that MDN1 plays an indispensable role in 60S ribosome biogenesis. Therefore, the observed hypersensitivity of mdn1-1 to a eukaryotic translation inhibitor and high-sugar conditions might be associated with the defect in ribosome biogenesis. Overall, this work establishes a role of Arabidopsis MDN1 in ribosome biogenesis, which agrees with its roles in embryogenesis and root development.
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Affiliation(s)
- Peng-Cheng Li
- Biotechnology Research Center, Shandong Academy of Agricultural Sciences, Shandong Provincial Key Laboratory of Crop Genetic Improvement, Ecology and Physiology, Jinan 250100, PR China
| | - Ke Li
- College of Life Science, Shandong University, Qingdao 266237, PR China
| | - Juan Wang
- College of Life Sciences, Shandong Normal University, Jinan 250014, PR China
| | - Chuan-Zhi Zhao
- Biotechnology Research Center, Shandong Academy of Agricultural Sciences, Shandong Provincial Key Laboratory of Crop Genetic Improvement, Ecology and Physiology, Jinan 250100, PR China
| | - Shu-Zhen Zhao
- Biotechnology Research Center, Shandong Academy of Agricultural Sciences, Shandong Provincial Key Laboratory of Crop Genetic Improvement, Ecology and Physiology, Jinan 250100, PR China
| | - Lei Hou
- Biotechnology Research Center, Shandong Academy of Agricultural Sciences, Shandong Provincial Key Laboratory of Crop Genetic Improvement, Ecology and Physiology, Jinan 250100, PR China
| | - Han Xia
- Biotechnology Research Center, Shandong Academy of Agricultural Sciences, Shandong Provincial Key Laboratory of Crop Genetic Improvement, Ecology and Physiology, Jinan 250100, PR China
| | - Chang-Le Ma
- College of Life Sciences, Shandong Normal University, Jinan 250014, PR China
| | - Xing-Jun Wang
- Biotechnology Research Center, Shandong Academy of Agricultural Sciences, Shandong Provincial Key Laboratory of Crop Genetic Improvement, Ecology and Physiology, Jinan 250100, PR China
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Hayashi K, Matsunaga S. Heat and chilling stress induce nucleolus morphological changes. JOURNAL OF PLANT RESEARCH 2019; 132:395-403. [PMID: 30847615 PMCID: PMC7198650 DOI: 10.1007/s10265-019-01096-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2018] [Accepted: 02/12/2019] [Indexed: 05/20/2023]
Abstract
The nucleolus, where components of the ribosome are constructed, is known to play an important role in various stress responses in animals. However, little is known about the role of the plant nucleolus under environmental stresses such as heat and chilling stress. In this study, we analyzed nucleolus morphology by determining the distribution of newly synthesized rRNAs with an analog of uridine, 5-ethynyl uridine (EU). When EU was incorporated into the root of the Arabidopsis thaliana, EU signals were strongly localized in the nucleolus. The results of the short-term incorporation of EU implied that there is no compartmentation among the processes of transcription, processing, and construction of rRNAs. Nevertheless, under heat and chilling stress, EU was not incorporated into the center of the nucleolus. Morphological analyses using whole rRNA staining and differential interference contrast observations revealed speckled and round structures in the center of the nucleolus under heat and chilling stress, respectively.
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Affiliation(s)
- Kohma Hayashi
- Department of Applied Biological Science Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba, 278-8510, Japan
| | - Sachihiro Matsunaga
- Department of Applied Biological Science Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba, 278-8510, Japan.
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21
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Fonseca S, Rubio V. Arabidopsis CRL4 Complexes: Surveying Chromatin States and Gene Expression. FRONTIERS IN PLANT SCIENCE 2019; 10:1095. [PMID: 31608079 PMCID: PMC6761389 DOI: 10.3389/fpls.2019.01095] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2019] [Accepted: 08/09/2019] [Indexed: 05/10/2023]
Abstract
CULLIN4 (CUL4) RING ligase (CRL4) complexes contain a CUL4 scaffold protein, associated to RBX1 and to DDB1 proteins and have traditionally been associated to protein degradation events. Through DDB1, these complexes can associate with numerous DCAF proteins, which directly interact with specific targets promoting their ubiquitination and subsequent degradation by the proteasome. A characteristic feature of the majority of DCAF proteins that associate with DDB1 is the presence of the DWD motif. DWD-containing proteins sum up to 85 in the plant model species Arabidopsis. In the last decade, numerous Arabidopsis DWD proteins have been studied and their molecular functions uncovered. Independently of whether their association with CRL4 has been confirmed or not, DWD proteins are often found as components of additional multimeric protein complexes that play key roles in essential nuclear events. For most of them, the significance of their complex partnership is still unexplored. Here, we summarize recent findings involving both confirmed and putative CRL4-associated DCAF proteins in regulating nuclei architecture remodelling, DNA damage repair, histone post-translational modification, mRNA processing and export, and ribosome biogenesis, that definitely have an impact in gene expression and de novo protein synthesis. We hypothesized that, by maintaining accurate levels of regulatory proteins through targeted degradation and transcriptional control, CRL4 complexes help to surveil nuclear processes essential for plant development and survival.
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Ni J, Shah FA, Liu W, Wang Q, Wang D, Zhao W, Lu W, Huang S, Fu S, Wu L. Comparative transcriptome analysis reveals the regulatory networks of cytokinin in promoting the floral feminization in the oil plant Sapium sebiferum. BMC PLANT BIOLOGY 2018; 18:96. [PMID: 29848288 PMCID: PMC5975670 DOI: 10.1186/s12870-018-1314-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2018] [Accepted: 05/18/2018] [Indexed: 05/06/2023]
Abstract
BACKGROUND Sapium sebiferum, whose seeds contain high level of fatty acids, has been considered as one of the most important oil plants. However, the high male to female flower ratio limited the seed yield improvement and its industrial potentials. Thus, the study of the sex determination in S. sebiferum is of significant importance in increasing the seed yield. RESULTS In this study, we demonstrated that in S. sebiferum, cytokinin (CK) had strong feminization effects on the floral development. Exogenous application with 6-benzylaminopurine (6-BA) or thidiazuron (TDZ) significantly induced the development of female flowers and increased the fruit number. Interestingly, the feminization effects of cytokinin were also detected on the androecious genotype of S. sebiferum which only produce male flowers. To further investigate the mechanism underlying the role of cytokinin in the flower development and sex differentiation, we performed the comparative transcriptome analysis of the floral buds of the androecious plants subjected to 6-BA. The results showed that there were separately 129, 352 and 642 genes differentially expressed at 6 h, 12 h and 24 h after 6-BA treatment. Functional analysis of the differentially expressed genes (DEGs) showed that many genes are related to the hormonal biosynthesis and signaling, nutrients translocation and cell cycle. Moreover, there were twenty one flowering-related genes identified to be differentially regulated by 6-BA treatment. Specifically, the gynoecium development-related genes SPATULA (SPT), KANADI 2 (KAN2), JAGGED (JAG) and Cytochrome P450 78A9 (CYP79A9) were significantly up-regulated, whereas the expression of PISTILLATA (PI), TATA Box Associated Factor II 59 (TAFII59) and MYB Domain Protein 108 (MYB108) that were important for male organ development was down-regulated in response to 6-BA treatment, demonstrating that cytokinin could directly target the floral organ identity genes to regulate the flower sex. CONCLUSIONS Our work demonstrated that cytokinin is a potential regulator in female flower development in S. sebiferum. The transcriptome analysis of the floral sex transition from androecious to monoecious in response to cytokinin treatment on the androecious S. sebiferum provided valuable information related to the mechanism of sex determination in the perennial woody plants.
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Affiliation(s)
- Jun Ni
- Key laboratory of high magnetic field and Ion beam physical biology,Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, Anhui 230031 China
| | - Faheem Afzal Shah
- School of Forestry and Landscape Architecture, Anhui Agricultural University, Hefei, Anhui China
| | - Wenbo Liu
- Key laboratory of high magnetic field and Ion beam physical biology,Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, Anhui 230031 China
| | - Qiaojian Wang
- School of Forestry and Landscape Architecture, Anhui Agricultural University, Hefei, Anhui China
| | - Dongdong Wang
- School of Forestry and Landscape Architecture, Anhui Agricultural University, Hefei, Anhui China
| | - Weiwei Zhao
- Key laboratory of high magnetic field and Ion beam physical biology,Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, Anhui 230031 China
| | - Weili Lu
- Key laboratory of high magnetic field and Ion beam physical biology,Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, Anhui 230031 China
| | - Shengwei Huang
- Key laboratory of high magnetic field and Ion beam physical biology,Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, Anhui 230031 China
| | - Songling Fu
- School of Forestry and Landscape Architecture, Anhui Agricultural University, Hefei, Anhui China
| | - Lifang Wu
- Key laboratory of high magnetic field and Ion beam physical biology,Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, Anhui 230031 China
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Macovei A, Faè M, Biggiogera M, de Sousa Araújo S, Carbonera D, Balestrazzi A. Ultrastructural and Molecular Analyses Reveal Enhanced Nucleolar Activity in Medicago truncatula Cells Overexpressing the MtTdp2α Gene. FRONTIERS IN PLANT SCIENCE 2018; 9:596. [PMID: 29868059 PMCID: PMC5958304 DOI: 10.3389/fpls.2018.00596] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2017] [Accepted: 04/16/2018] [Indexed: 05/15/2023]
Abstract
The role of tyrosyl-DNA phosphodiesterase 2 (Tdp2) involved in the repair of 5'-end-blocking DNA lesions is still poorly explored in plants. To gain novel insights, Medicago truncatula suspension cultures overexpressing the MtTdp2α gene (Tdp2α-13C and Tdp2α-28 lines, respectively) and a control (CTRL) line carrying the empty vector were investigated. Transmission electron microscopy (TEM) revealed enlarged nucleoli (up to 44% expansion of the area, compared to CTRL), the presence of nucleolar vacuoles, increased frequency of multinucleolate cells (up to 4.3-fold compared to CTRL) and reduced number of ring-shaped nucleoli in Tdp2α-13C and Tdp2α-28 lines. Ultrastructural data suggesting for enhanced nucleolar activity in MtTdp2α-overexpressing lines were integrated with results from bromouridine incorporation. The latter revealed an increase of labeled transcripts in both Tdp2α-13C and Tdp2α-28 cells, within the nucleolus and in the extra-nucleolar region. MtTdp2α-overexpressing cells showed tolerance to etoposide, a selective inhibitor of DNA topoisomerase II, as evidenced by DNA diffusion assay. TEM analysis revealed etoposide-induced rearrangements within the nucleolus, resembling the nucleolar caps observed in animal cells under transcription impairment. Based on these findings it is evident that MtTdp2α-overexpression enhances nucleolar activity in plant cells.
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Affiliation(s)
- Anca Macovei
- Department of Biology and Biotechnology ‘L. Spallanzani’, Pavia, Italy
| | - Matteo Faè
- Department of Biology and Biotechnology ‘L. Spallanzani’, Pavia, Italy
| | - Marco Biggiogera
- Department of Biology and Biotechnology ‘L. Spallanzani’, Pavia, Italy
| | - Susana de Sousa Araújo
- Instituto de Technologia Quìmica e Biologica António Xavier, Universidade Nova de Lisboa, Lisbon, Portugal
| | - Daniela Carbonera
- Department of Biology and Biotechnology ‘L. Spallanzani’, Pavia, Italy
| | - Alma Balestrazzi
- Department of Biology and Biotechnology ‘L. Spallanzani’, Pavia, Italy
- *Correspondence: Alma Balestrazzi,
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Jeon Y, Ahn HK, Kang YW, Pai HS. Functional characterization of chloroplast-targeted RbgA GTPase in higher plants. PLANT MOLECULAR BIOLOGY 2017; 95:463-479. [PMID: 29038916 DOI: 10.1007/s11103-017-0664-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2017] [Accepted: 10/01/2017] [Indexed: 06/07/2023]
Abstract
KEY MESSAGE Plant RbgA GTPase is targeted to chloroplasts and co-fractionated with chloroplast ribosomes, and plays a role in chloroplast rRNA processing and/or ribosome biogenesis. Ribosome Biogenesis GTPase A (RbgA) homologs are evolutionarily conserved GTPases that are widely distributed in both prokaryotes and eukaryotes. In this study, we investigated functions of chloroplast-targeted RbgA. Nicotiana benthamiana RbgA (NbRbgA) and Arabidopsis thaliana RbgA (AtRbgA) contained a conserved GTP-binding domain and a plant-specific C-terminal domain. NbRbgA and AtRbgA were mainly localized in chloroplasts, and possessed GTPase activity. Since Arabidopsis rbgA null mutants exhibited an embryonic lethal phenotype, virus-induced gene silencing (VIGS) of NbRbgA was performed in N. benthamiana. NbRbgA VIGS resulted in a leaf-yellowing phenotype caused by disrupted chloroplast development. NbRbgA was mainly co-fractionated with 50S/70S ribosomes and interacted with the chloroplast ribosomal proteins cpRPL6 and cpRPL35. NbRbgA deficiency lowered the levels of mature 23S and 16S rRNAs in chloroplasts and caused processing defects. Sucrose density gradient sedimentation revealed that NbRbgA-deficient chloroplasts contained reduced levels of mature 23S and 16S rRNAs and diverse plastid-encoded mRNAs in the polysomal fractions, suggesting decreased protein translation activity in the chloroplasts. Interestingly, NbRbgA protein was highly unstable under high light stress, suggesting its possible involvement in the control of chloroplast ribosome biogenesis under environmental stresses. Collectively, these results suggest a role for RbgA GTPase in chloroplast rRNA processing/ribosome biogenesis, affecting chloroplast protein translation in higher plants.
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Affiliation(s)
- Young Jeon
- Department of Systems Biology, Yonsei University, Seoul, 03722, South Korea
| | - Hee-Kyung Ahn
- Department of Systems Biology, Yonsei University, Seoul, 03722, South Korea
| | - Yong Won Kang
- R&D Center, Morechem Co., Ltd., Yongin, Gyeonggi-do, 16954, South Korea
| | - Hyun-Sook Pai
- Department of Systems Biology, Yonsei University, Seoul, 03722, South Korea.
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Moraleva A, Magoulas C, Polzikov M, Hacot S, Mertani HC, Diaz JJ, Zatsepina O. Involvement of the specific nucleolar protein SURF6 in regulation of proliferation and ribosome biogenesis in mouse NIH/3T3 fibroblasts. Cell Cycle 2017; 16:1979-1991. [PMID: 28873013 DOI: 10.1080/15384101.2017.1371880] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
The nucleolar proteins which link cell proliferation to ribosome biogenesis are regarded to be potentially oncogenic. Here, in order to examine the involvement of an evolutionary conserved nucleolar protein SURF6/Rrp14 in proliferation and ribosome biogenesis in mammalian cells, we established stably transfected mouse NIH/3T3 fibroblasts capable of conditional overexpression of the protein. Cell proliferation was monitored in real-time, and various cell cycle parameters were quantified based on flow cytometry, Br-dU-labeling and conventional microscopy data. We show that overexpression of SURF6 accelerates cell proliferation and promotes transition through all cell cycle phases. The most prominent SURF6 pro-proliferative effects include a significant reduction of the population doubling time, from 19.8 ± 0.7 to 16.2 ± 0.5 hours (t-test, p < 0.001), and of the length of cell division cycle, from 17.6 ± 0.6 to 14.0 ± 0.4 hours (t-test, p < 0.001). The later was due to the shortening of all cell cycle phases but the length of G1 period was reduced most, from 5.7 ± 0.4 to 3.8 ± 0.3 hours, or by ∼30%, (t-test, p < 0.05). By Northern blots and qRT-PCR, we further showed that the acceleration of cell proliferation was concomitant with an accumulation of rRNA species along both ribosomal subunit maturation pathways. It is evident, therefore, that like the yeast homologue Rrp14, mammalian SURF6 is involved in various steps of rRNA processing during ribosome biogenesis. We concluded that SURF6 is a novel positive regulator of proliferation and G1/S transition in mammals, implicating that SURF6 is a potential oncogenic protein, which can be further studied as a putative target in anti-cancer therapy.
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Affiliation(s)
- Anastasiia Moraleva
- a Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences , Moscow , Russian Federation
| | - Charalambos Magoulas
- b Centre for Investigative and Diagnostic Oncology, Department of Natural Sciences, School of Science and Technology , Middlesex University , London , United Kingdom
| | - Mikhail Polzikov
- a Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences , Moscow , Russian Federation
| | - Sabine Hacot
- c Centre de Recherche en Cancérologie de Lyon, UMR INSERM 1052-CNRS 5286, Centre Léon Bérard , Université Claude Bernard Lyon I, Université de Lyon , Lyon , France
| | - Hichem C Mertani
- c Centre de Recherche en Cancérologie de Lyon, UMR INSERM 1052-CNRS 5286, Centre Léon Bérard , Université Claude Bernard Lyon I, Université de Lyon , Lyon , France
| | - Jean-Jacques Diaz
- c Centre de Recherche en Cancérologie de Lyon, UMR INSERM 1052-CNRS 5286, Centre Léon Bérard , Université Claude Bernard Lyon I, Université de Lyon , Lyon , France
| | - Olga Zatsepina
- a Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences , Moscow , Russian Federation.,c Centre de Recherche en Cancérologie de Lyon, UMR INSERM 1052-CNRS 5286, Centre Léon Bérard , Université Claude Bernard Lyon I, Université de Lyon , Lyon , France
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Zhao H, Lü S, Xiong L. AtLSG1-2 Regulates Leaf Growth by Affecting Cell Proliferation and the Onset of Endoreduplication and Synergistically Interacts with AtNMD3 during Cell Proliferation Process. FRONTIERS IN PLANT SCIENCE 2017; 8:337. [PMID: 28344588 PMCID: PMC5344897 DOI: 10.3389/fpls.2017.00337] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/10/2016] [Accepted: 02/27/2017] [Indexed: 06/06/2023]
Abstract
AtLSG1-2 is a circularly permuted GTPase required for ribosome biogenesis and recently shown to be involved in early leaf development, although it was unclear how AtLSG1-2 affects leaf growth. Here, we found that atlsg1-2 mutants had reduced leaf size as a result of decreased cell size and cell number. Leaf kinematic analysis and CYCB1;1::GUS expression pattern in atlsg1-2 mutant indicated that loss of function of AtLSG1-2 delays the transition from cell division to cell expansion. Decreases in ploidy levels and trichome branch number suggest that AtLSG1-2 deficiency suppresses endoreduplication. Real-time PCR analysis showed that genes specifically expressed in the proliferation stage were highly expressed and those involved in endoreduplication were differentially regulated. LSG1 is known to mediate the recruitment of nucleocytoplasmic shuttling protein NMD3 back to the nucleus in yeast, yet their relationship was unclear in plants. Our genetic analysis revealed that the atlsg1 atnmd3 double mutant displayed enhanced phenotypes as compared with the respective single mutant and that AtLSG1-2 and AtNMD3 synergistically affect the cell proliferation process.
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Affiliation(s)
- Huayan Zhao
- Applied Biotechnology Center, Wuhan Institute of BioengineeringWuhan, China
- Division of Biological and Environmental Sciences and Engineering, King Abdullah University of Science and TechnologyThuwal, Saudi Arabia
| | - Shiyou Lü
- Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture, Wuhan Botanical Garden, Chinese Academy of SciencesWuhan, China
| | - Liming Xiong
- Division of Biological and Environmental Sciences and Engineering, King Abdullah University of Science and TechnologyThuwal, Saudi Arabia
- Department of Horticulture Sciences, Texas A&M University, College StationTX, USA
- Texas A&M Agrilife Research Center, DallasTX, USA
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Liu Y, Zhou Q, Zhou D, Huang C, Meng X, Li J. Secreted frizzled-related protein 2-mediated cancer events: Friend or foe? Pharmacol Rep 2017; 69:403-408. [PMID: 28273499 DOI: 10.1016/j.pharep.2017.01.001] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2016] [Revised: 12/22/2016] [Accepted: 01/09/2017] [Indexed: 01/04/2023]
Abstract
Secreted frizzled-related protein (SFRP)2, an identified member of the SFRPs family of molecules, is often methylated in human cancers and its down-regulation is closely related to Wnt signaling activity and tumor progression. Although the blocker of the Wnt signaling has not been fully used in clinical trial, interest has been further enhanced by the realization of SFRPs' potential as targets to modulate Wnt signaling and cancer cell growth. Emerging evidence showed that SFRP2 was an anti-oncogene, however, a steady flow of research has indicated that it may also have tumor promotion effects in some cancer types. Furthermore, SFRP2 methylation was shown to accelerate cancer cell invasion and growth in tumor progression. In this review, we define recent understanding of the diverse roles of SFRP2 in tumorigenesis, and it might promote the development of novel drugs for curing cancer by targeting SFRP2.
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Affiliation(s)
- Yanhui Liu
- School of Pharmacy, Anhui Key Laboratory of Bioactivity of Natural Products, Anhui Medical University, Hefei 230032, China; Anhui Institute of Innovative Drugs, Hefei 230032, China
| | - Qun Zhou
- School of Pharmacy, Anhui Key Laboratory of Bioactivity of Natural Products, Anhui Medical University, Hefei 230032, China; Anhui Institute of Innovative Drugs, Hefei 230032, China
| | - Dexi Zhou
- School of Pharmacy, Anhui Key Laboratory of Bioactivity of Natural Products, Anhui Medical University, Hefei 230032, China; Anhui Institute of Innovative Drugs, Hefei 230032, China
| | - Cheng Huang
- School of Pharmacy, Anhui Key Laboratory of Bioactivity of Natural Products, Anhui Medical University, Hefei 230032, China; Anhui Institute of Innovative Drugs, Hefei 230032, China
| | - Xiaoming Meng
- School of Pharmacy, Anhui Key Laboratory of Bioactivity of Natural Products, Anhui Medical University, Hefei 230032, China; Anhui Institute of Innovative Drugs, Hefei 230032, China
| | - Jun Li
- School of Pharmacy, Anhui Key Laboratory of Bioactivity of Natural Products, Anhui Medical University, Hefei 230032, China; Anhui Institute of Innovative Drugs, Hefei 230032, China.
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