1
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Avellino A, Peng CH, Lin MD. Cell Cycle Regulation by NF-YC in Drosophila Eye Imaginal Disc: Implications for Synchronization in the Non-Proliferative Region. Int J Mol Sci 2023; 24:12203. [PMID: 37569581 PMCID: PMC10418845 DOI: 10.3390/ijms241512203] [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: 07/02/2023] [Revised: 07/26/2023] [Accepted: 07/27/2023] [Indexed: 08/13/2023] Open
Abstract
Cell cycle progression during development is meticulously coordinated with differentiation. This is particularly evident in the Drosophila 3rd instar eye imaginal disc, where the cell cycle is synchronized and arrests at the G1 phase in the non-proliferative region (NPR), setting the stage for photoreceptor cell differentiation. Here, we identify the transcription factor Nuclear Factor-YC (NF-YC) as a crucial player in this finely tuned progression, elucidating its specific role in the synchronized movement of the morphogenetic furrow. Depletion of NF-YC leads to extended expression of Cyclin A (CycA) and Cyclin B (CycB) from the FMW to the NPR. Notably, NF-YC knockdown resulted in decreased expression of Eyes absent (Eya) but did not affect Decapentaplegic (Dpp) and Hedgehog (Hh). Our findings highlight the role of NF-YC in restricting the expression of CycA and CycB in the NPR, thereby facilitating cell-cycle synchronization. Moreover, we identify the transcriptional cofactor Eya as a downstream target of NF-YC, revealing a new regulatory pathway in Drosophila eye development. This study expands our understanding of NF-YC's role from cell cycle control to encompass developmental processes.
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Affiliation(s)
- Anthony Avellino
- Department of Molecular Biology and Human Genetics, Tzu Chi University, 701 Zhongyang Rd., Sec. 3, Hualien 97004, Taiwan;
| | - Chen-Huan Peng
- Department of Orthopedics, Hualien Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, 707 Zhongyang Rd., Sec. 3, Hualien 97002, Taiwan;
- School of Medicine, Tzu Chi University, 701 Zhongyang Rd., Sec. 3, Hualien 97004, Taiwan
| | - Ming-Der Lin
- Department of Molecular Biology and Human Genetics, Tzu Chi University, 701 Zhongyang Rd., Sec. 3, Hualien 97004, Taiwan;
- Institute of Medical Sciences, Tzu Chi University, 701 Zhongyang Rd., Sec. 3, Hualien 97004, Taiwan
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2
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Wan MSM, Muhammad R, Koliopoulos MG, Roumeliotis TI, Choudhary JS, Alfieri C. Mechanism of assembly, activation and lysine selection by the SIN3B histone deacetylase complex. Nat Commun 2023; 14:2556. [PMID: 37137925 PMCID: PMC10156912 DOI: 10.1038/s41467-023-38276-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2023] [Accepted: 04/22/2023] [Indexed: 05/05/2023] Open
Abstract
Lysine acetylation in histone tails is a key post-translational modification that controls transcription activation. Histone deacetylase complexes remove histone acetylation, thereby repressing transcription and regulating the transcriptional output of each gene. Although these complexes are drug targets and crucial regulators of organismal physiology, their structure and mechanisms of action are largely unclear. Here, we present the structure of a complete human SIN3B histone deacetylase holo-complex with and without a substrate mimic. Remarkably, SIN3B encircles the deacetylase and contacts its allosteric basic patch thereby stimulating catalysis. A SIN3B loop inserts into the catalytic tunnel, rearranges to accommodate the acetyl-lysine moiety, and stabilises the substrate for specific deacetylation, which is guided by a substrate receptor subunit. Our findings provide a model of specificity for a main transcriptional regulator conserved from yeast to human and a resource of protein-protein interactions for future drug designs.
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Affiliation(s)
- Mandy S M Wan
- Division of Structural Biology, Chester Beatty Laboratories, The Institute of Cancer Research, London, UK
| | - Reyhan Muhammad
- Division of Structural Biology, Chester Beatty Laboratories, The Institute of Cancer Research, London, UK
| | - Marios G Koliopoulos
- Division of Structural Biology, Chester Beatty Laboratories, The Institute of Cancer Research, London, UK
| | - Theodoros I Roumeliotis
- Functional Proteomics, Chester Beatty Laboratories, Cancer Biology Division, The Institute of Cancer Research, London, UK
| | - Jyoti S Choudhary
- Functional Proteomics, Chester Beatty Laboratories, Cancer Biology Division, The Institute of Cancer Research, London, UK
| | - Claudio Alfieri
- Division of Structural Biology, Chester Beatty Laboratories, The Institute of Cancer Research, London, UK.
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3
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Sumiya N. Cis-acting elements involved in the G2/M-phase-specific transcription of the cyclin B gene in the unicellular alga Cyanidioschyzon merolae. JOURNAL OF PLANT RESEARCH 2021; 134:1301-1310. [PMID: 34338916 DOI: 10.1007/s10265-021-01334-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2021] [Accepted: 07/20/2021] [Indexed: 06/13/2023]
Abstract
M-specific activator (MSA) cis-acting elements have been determined to be involved in the regulation of G2/M-phase-specific transcription in spermatophytes. In this study, the involvement of MSA-core elements in G2/M-phase-specific transcription was examined in the unicellular red alga Cyanidioschyzon merolae. In the C. merolae genome, MSA-core elements do not accumulate specifically in the upstream of mitosis-specific transcriptional genes. Mutations of the four MSA-core elements of the cyclin B gene, which encodes a central factor of the G2-to-M-phase transition, have resulted in the abolishment of transcription or permission of transcription even in the G1 phase. These results suggest that all four MSA-core elements located in the upstream region of cyclin B are involved in G2/M-phase-specific transcription in C. merolae; however, the nature of the involvement of MSA-core elements in G2/M-phase-specific transcription differed among the four elements. Thus, MSA-core-element-mediated G2/M-phase-specific transcription in C. merolae seems to be regulated by a complex mechanism.
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Affiliation(s)
- Nobuko Sumiya
- Department of Biology, Keio University, 4-1-1 Hiyoshi, Kohoku-ku, Yokohama, 223-8521, Japan.
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4
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Chen J. NF-Y is critical for the proper growth of zebrafish embryonic heart and its cardiomyocyte proliferation. Genesis 2021; 59:e23408. [PMID: 33417743 DOI: 10.1002/dvg.23408] [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: 03/06/2020] [Revised: 12/27/2020] [Accepted: 12/29/2020] [Indexed: 11/06/2022]
Abstract
The ubiquitous NF-Y gene regulates the expression of different genes in various signaling pathways. However, the function of NF-Y in zebrafish heart development is largely unknown. Previously we identified a same group of cell cycle related gene cluster (CCRG) was downregulated in the embryonic hearts with impeded growth due to various stresses. The promoter regions of these CCRG genes shared a most common motif for NF-Y. Chromatin immunoprecipitation experiment demonstrated that the binding of NF-Y to its motif was real on the CCRG candidate gene promoters. Knockdown of embryonic NF-Y by morpholinos led to a small heart, mimicking the abnormal heart phenotype caused by other stresses. In parallel the expression of certain CCRG candidate genes was reduced in the NF-Y A morphant hearts exposed to malignant environments. Absence of NF-Y A also led to undermine cardiomyocyte proliferation and hence less total number of caridomyocytes per heart. Trans-AM Elisa experiment also found that in the presence of the stresses such as TCDD and TNNT2 MO, the binding capacity of NF-Y A subunit to its core motif was reduced. We conclude that NF-Y sustains proper cardiomyocyte proliferation in the heart, thus it plays a positive role in promoting early zebrafish heart growth.
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Affiliation(s)
- Jing Chen
- Provincial University Key Laboratory of Cellular Stress Response and Metabolic Regulation, College of Life Sciences, Fujian Normal University, Fuzhou, China
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5
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Lim S, Shparberg RA, Coorssen JR, O’Connor MD. Application of the RBBP9 Serine Hydrolase Inhibitor, ML114, Decouples Human Pluripotent Stem Cell Proliferation and Differentiation. Int J Mol Sci 2020; 21:ijms21238983. [PMID: 33256189 PMCID: PMC7730578 DOI: 10.3390/ijms21238983] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2020] [Revised: 11/13/2020] [Accepted: 11/20/2020] [Indexed: 12/14/2022] Open
Abstract
Retinoblastoma binding protein 9 (RBBP9) is required for maintaining the expression of both pluripotency and cell cycle genes in human pluripotent stem cells (hPSCs). An siRNA-based study from our group showed it does so by influencing cell cycle progression through the RB/E2F pathway. In non-pluripotent cells, RBBP9 is also known to have serine hydrolase (SH) activity, acting on currently undefined target proteins. The role of RBBP9 SH activity in hPSCs, and during normal development, is currently unknown. To begin assessing whether RBBP9 SH activity might contribute to hPSC maintenance, hPSCs were treated with ML114—a selective chemical inhibitor of RBBP9 SH activity. Stem cells treated with ML114 showed significantly reduced population growth rate, colony size and progression through the cell cycle, with no observable change in cell morphology or decrease in pluripotency antigen expression—suggesting no initiation of hPSC differentiation. Consistent with this, hPSCs treated with ML114 retained the capacity for tri-lineage differentiation, as seen through teratoma formation. Subsequent microarray and Western blot analyses of ML114-treated hPSCs suggest the nuclear transcription factor Y subunit A (NFYA) may be a candidate effector of RBBP9 SH activity in hPSCs. These data support a role for RBBP9 in regulating hPSC proliferation independent of differentiation, whereby inhibition of RBBP9 SH activity de-couples decreased hPSC proliferation from initiation of differentiation.
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Affiliation(s)
- Seakcheng Lim
- School of Medicine, Western Sydney University, Campbelltown NSW 2560, Australia; (S.L.); (R.A.S.)
| | - Rachel A. Shparberg
- School of Medicine, Western Sydney University, Campbelltown NSW 2560, Australia; (S.L.); (R.A.S.)
| | - Jens R. Coorssen
- Departments of Health Sciences and Biological Sciences, Faculties of Applied Health Sciences and Mathematics & Science, Brock University, St. Catharines, ON L2S 3A1, Canada;
| | - Michael D. O’Connor
- School of Medicine, Western Sydney University, Campbelltown NSW 2560, Australia; (S.L.); (R.A.S.)
- Molecular Medicine Research Group, Western Sydney University, Campbelltown NSW 2560, Australia
- Correspondence:
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6
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Chen HH, Liu YL, Liu XY, Zhang JL, Xu HJ. Functional Analysis of Nuclear Factor Y in the Wing-Dimorphic Brown Planthopper, Nilaparvata lugens (Hemiptera: Delphacidae). Front Genet 2020; 11:585320. [PMID: 33240330 PMCID: PMC7670041 DOI: 10.3389/fgene.2020.585320] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2020] [Accepted: 10/12/2020] [Indexed: 11/15/2022] Open
Abstract
Nuclear factor Y (NF-Y) is a heterotrimeric transcription factor with the ability to bind to a CCAAT box in nearly all eukaryotes. However, the function of NF-Y in the life-history traits of insects is unclear. Here, we identified three NF-Y subunits, NlNF-YA, NlNF-YB, and NlNF-YC, in the wing-dimorphic brown planthopper (BPH), Nilaparvata lugens. Spatio-temporal analysis indicated that NlNF-YA, NlNF-YB, and NlNF-YC distributed extensively in various body parts of fourth-instar nymphs, and were highly expressed at the egg stage. RNA interference (RNAi)-mediated silencing showed that knockdown of NlNF-YA, NlNF-YB, or NlNF-YC in third-instar nymphs significantly extended the fifth-instar duration, and decreased nymph-adult molting rate. The addition of 20-hydroxyecdysone could specifically rescue the defect in adult molting caused by NlNF-YARNAi, indicating that NlNF-Y might modulate the ecdysone signaling pathway in the BPH. In addition, NlNF-YARNAi, NlNF-YBRNAi, or NlNF-YCRNAi led to small and moderately malformed forewings and hindwings, and impaired the normal assembly of indirect flight muscles. Adult BPHs treated with NlNF-YARNAi, NlNF-YBRNAi, or NlNF-YCRNAi produced fewer eggs, and eggs laid by these BPHs had arrested embryogenesis. These findings deepen our understanding of NF-Y function in hemipteran insects.
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Affiliation(s)
- Hao-Hao Chen
- Institute of Insect Sciences, Zhejiang University, Hangzhou, China
| | - Yi-Lai Liu
- Institute of Insect Sciences, Zhejiang University, Hangzhou, China
| | - Xin-Yang Liu
- Institute of Insect Sciences, Zhejiang University, Hangzhou, China
| | - Jin-Li Zhang
- Institute of Insect Sciences, Zhejiang University, Hangzhou, China
| | - Hai-Jun Xu
- Institute of Insect Sciences, Zhejiang University, Hangzhou, China.,Ministry of Agriculture Key Laboratory of Molecular Biology of Crop Pathogens and Insect Pests, Zhejiang University, Hangzhou, China.,State Key Laboratory of Rice Biology, Zhejiang University, Hangzhou, China
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7
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Chiang CY, Hsu KD, Lin YY, Hsieh CW, Liu JM, Lu TY, Cheng KC. The Antiproliferation Activity of Ganoderma formosanum Extracts on Prostate Cancer Cells. MYCOBIOLOGY 2020; 48:219-227. [PMID: 37970558 PMCID: PMC10635139 DOI: 10.1080/12298093.2020.1746064] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/02/2019] [Revised: 03/12/2020] [Accepted: 03/15/2020] [Indexed: 11/17/2023]
Abstract
Androgen-independent prostate cancer accounts for mortality in the world. In this study, various extracts of a medical fungus dubbed Ganoderma formosanum were screened for inhibition of DU145 cells, an androgen-independent prostate cancer cell line. Results demonstrated that both hexane (GF-EH) and butanol (GF-EB) fraction of G. formosanum ethanol extract inhibited DU145 cell viability in a dose-dependent manner. GF-EH induced cell-cycle arrest in G1 phase of DU145 cells via downregulation of cyclin E2 protein expression. In addition, GF-EB triggered extrinsic apoptosis of DU145 cells by activating caspase 3 gene expression resulting in programed cell death. Above all, both GF-EH and GF-EB show lower toxicity to normal human fibroblast cell line compared to DU145 cell, implying that they possess specific drug action on cancer cells. This study provides a molecular basis of G. formosanum extract as a potential ingredient for treatment of androgen-independent prostate cancer.
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Affiliation(s)
- Cheng-Yen Chiang
- Division of Urology, Department of Surgery, Taoyuan General Hospital, Ministry of Health and Welfare, Taoyuan City, Taiwan
| | - Kai-Di Hsu
- Institute of Biotechnology, National Taiwan University, Taipei, Taiwan
| | - Yen-Yi Lin
- Institute of Biotechnology, National Taiwan University, Taipei, Taiwan
| | - Chang-Wei Hsieh
- Department of Food Science and Biotechnology, National Chung Hsing University, Taichung, Taiwan
| | - Jui-Ming Liu
- Division of Urology, Department of Surgery, Taoyuan General Hospital, Ministry of Health and Welfare, Taoyuan City, Taiwan
| | - Tze-Ying Lu
- Department of Internal Medicine, Taipei Medical University–Shuang Ho Hospital, New Taipei City, Taiwan
| | - Kuan-Chen Cheng
- Institute of Biotechnology, National Taiwan University, Taipei, Taiwan
- Graduate Institute of Food Science Technology, National Taiwan University, Taipei, Taiwan
- Department of Medical Research, China Medical University Hospital, China. Medical University, Taichung, Taiwan
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8
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Belluti S, Semeghini V, Basile V, Rigillo G, Salsi V, Genovese F, Dolfini D, Imbriano C. An autoregulatory loop controls the expression of the transcription factor NF-Y. BIOCHIMICA ET BIOPHYSICA ACTA-GENE REGULATORY MECHANISMS 2018; 1861:509-518. [DOI: 10.1016/j.bbagrm.2018.02.008] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2017] [Revised: 02/14/2018] [Accepted: 02/27/2018] [Indexed: 12/16/2022]
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9
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Cicchillitti L, Manni I, Mancone C, Regazzo G, Spagnuolo M, Alonzi T, Carlomosti F, Dell'Anna ML, Dell'Omo G, Picardo M, Ciana P, Capogrossi MC, Tripodi M, Magenta A, Rizzo MG, Gurtner A, Piaggio G. The laminA/NF-Y protein complex reveals an unknown transcriptional mechanism on cell proliferation. Oncotarget 2018; 8:2628-2646. [PMID: 27793050 PMCID: PMC5356829 DOI: 10.18632/oncotarget.12914] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2016] [Accepted: 10/10/2016] [Indexed: 12/02/2022] Open
Abstract
Lamin A is a component of the nuclear matrix that also controls proliferation by largely unknown mechanisms. NF-Y is a ubiquitous protein involved in cell proliferation composed of three subunits (-YA -YB -YC) all required for the DNA binding and transactivation activity. To get clues on new NF-Y partner(s) we performed a mass spectrometry screening of proteins that co-precipitate with the regulatory subunit of the complex, NF-YA. By this screening we identified lamin A as a novel putative NF-Y interactor. Co-immunoprecipitation experiments and confocal analysis confirmed the interaction between the two endogenous proteins. Interestingly, this association occurs on euchromatin regions, too. ChIP experiments demonstrate lamin A enrichment in several promoter regions of cell cycle related genes in a NF-Y dependent manner. Gain and loss of function experiments reveal that lamin A counteracts NF-Y transcriptional activity. Taking advantage of a recently generated transgenic reporter mouse, called MITO-Luc, in which an NF-Y–dependent promoter controls luciferase expression, we demonstrate that lamin A counteracts NF-Y transcriptional activity not only in culture cells but also in living animals. Altogether, our data demonstrate the occurrence of lamin A/NF-Y interaction and suggest a possible role of this protein complex in regulation of NF-Y function in cell proliferation.
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Affiliation(s)
- Lucia Cicchillitti
- Department of Research, Advanced Diagnostics and Technological Innovation, SAFU Unit, Translational Research Area, Regina Elena National Cancer Institute, 00144 Rome, Italy
| | - Isabella Manni
- Department of Research, Advanced Diagnostics and Technological Innovation, SAFU Unit, Translational Research Area, Regina Elena National Cancer Institute, 00144 Rome, Italy
| | - Carmine Mancone
- National Institute for Infectious Diseases L. Spallanzani, IRCCS, Department of Epidemiology and Preclinical Research, 00149 Rome, Italy.,Department of Cellular Biotechnologies and Haematology, Istituto Pasteur Italia, Fondazione Cenci Bolognetti, Sapienza University of Rome, 00161 Rome, Italy
| | - Giulia Regazzo
- Department of Research, Advanced Diagnostics and Technological Innovation, Genomic and Epigenetic Unit, Translational Research Area, Regina Elena National Cancer Institute, Rome, Italy
| | - Manuela Spagnuolo
- Department of Research, Advanced Diagnostics and Technological Innovation, Genomic and Epigenetic Unit, Translational Research Area, Regina Elena National Cancer Institute, Rome, Italy
| | - Tonino Alonzi
- National Institute for Infectious Diseases L. Spallanzani, IRCCS, Department of Epidemiology and Preclinical Research, 00149 Rome, Italy
| | - Fabrizio Carlomosti
- Fondazione Luigi Maria Monti, Istituto Dermopatico dell'Immacolata-IRCCS, Laboratorio di Patologia Vascolare, 00167 Rome, Italy
| | - Maria Lucia Dell'Anna
- Cutaneous Physiopathology and Integrated Center of Metabolomics Research, San Gallicano Dermatologic Institute, IRCCS, 00144 Rome, Italy
| | - Giulia Dell'Omo
- Department of Oncology and Hemato-Oncology and Department of Pharmacological and Biomolecular Sciences, University of Milan, 20133 Milan, Italy
| | - Mauro Picardo
- Cutaneous Physiopathology and Integrated Center of Metabolomics Research, San Gallicano Dermatologic Institute, IRCCS, Via Elio Chianesi 53, 00144, Rome, Italy
| | - Paolo Ciana
- Center of Excellence on Neurodegenerative Diseases, Department of Oncology and Hemato-Oncology, University of Milan, 20133 Milan, Italy
| | - Maurizio C Capogrossi
- Fondazione Luigi Maria Monti, Istituto Dermopatico dell'Immacolata-IRCCS, Laboratorio di Patologia Vascolare, Via dei Monti di Creta 104, Rome 00167, Italy Rome, Italy
| | - Marco Tripodi
- National Institute for Infectious Diseases L. Spallanzani, IRCCS, Department of Epidemiology and Preclinical Research, 00149 Rome, Italy.,Department of Cellular Biotechnologies and Haematology, Istituto Pasteur Italia, Fondazione Cenci Bolognetti, Sapienza University of Rome, 00161 Rome, Italy
| | - Alessandra Magenta
- Fondazione Luigi Maria Monti, Istituto Dermopatico dell'Immacolata-IRCCS, Laboratorio di Patologia Vascolare, Via dei Monti di Creta 104, Rome 00167, Italy Rome, Italy
| | - Maria Giulia Rizzo
- Department of Research, Advanced Diagnostics and Technological Innovation, Genomic and Epigenetic Unit, Translational Research Area, Regina Elena National Cancer Institute, Rome, Italy
| | - Aymone Gurtner
- Department of Research, Advanced Diagnostics and Technological Innovation, SAFU Unit, Translational Research Area, Regina Elena National Cancer Institute, 00144 Rome, Italy
| | - Giulia Piaggio
- Department of Research, Advanced Diagnostics and Technological Innovation, SAFU Unit, Translational Research Area, Regina Elena National Cancer Institute, 00144 Rome, Italy
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10
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Fischer M, Müller GA. Cell cycle transcription control: DREAM/MuvB and RB-E2F complexes. Crit Rev Biochem Mol Biol 2017; 52:638-662. [PMID: 28799433 DOI: 10.1080/10409238.2017.1360836] [Citation(s) in RCA: 150] [Impact Index Per Article: 21.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The precise timing of cell cycle gene expression is critical for the control of cell proliferation; de-regulation of this timing promotes the formation of cancer and leads to defects during differentiation and development. Entry into and progression through S phase requires expression of genes coding for proteins that function in DNA replication. Expression of a distinct set of genes is essential to pass through mitosis and cytokinesis. Expression of these groups of cell cycle-dependent genes is regulated by the RB pocket protein family, the E2F transcription factor family, and MuvB complexes together with B-MYB and FOXM1. Distinct combinations of these transcription factors promote the transcription of the two major groups of cell cycle genes that are maximally expressed either in S phase (G1/S) or in mitosis (G2/M). In this review, we discuss recent work that has started to uncover the molecular mechanisms controlling the precisely timed expression of these genes at specific cell cycle phases, as well as the repression of the genes when a cell exits the cell cycle.
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Affiliation(s)
- Martin Fischer
- a Molecular Oncology, Medical School, University of Leipzig , Leipzig , Germany.,b Department of Medical Oncology , Dana-Farber Cancer Institute , Boston , MA , USA.,c Department of Medicine, Brigham and Women's Hospital , Harvard Medical School , Boston , MA , USA
| | - Gerd A Müller
- a Molecular Oncology, Medical School, University of Leipzig , Leipzig , Germany
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11
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Gurtner A, Manni I, Piaggio G. NF-Y in cancer: Impact on cell transformation of a gene essential for proliferation. BIOCHIMICA ET BIOPHYSICA ACTA-GENE REGULATORY MECHANISMS 2016; 1860:604-616. [PMID: 27939755 DOI: 10.1016/j.bbagrm.2016.12.005] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/26/2016] [Revised: 11/30/2016] [Accepted: 12/05/2016] [Indexed: 12/17/2022]
Abstract
NF-Y is a ubiquitous heterotrimeric transcription factor with a binding affinity for the CCAAT consensus motif, one of the most common cis-acting element in the promoter and enhancer regions of eukaryote genes in direct (CCAAT) or reverse (ATTGG) orientation. NF-Y consists of three subunits, NF-YA, the regulatory subunit of the trimer, NF-YB, and NF-YC, all required for CCAAT binding. Growing evidence in cells and animal models support the notion that NF-Y, driving transcription of a plethora of cell cycle regulatory genes, is a key player in the regulation of proliferation. Proper control of cellular growth is critical for cancer prevention and uncontrolled proliferation is a hallmark of cancer cells. Indeed, during cell transformation aberrant molecular pathways disrupt mechanisms controlling proliferation and many growth regulatory genes are altered in tumors. Here, we review bioinformatics, molecular and functional evidence indicating the involvement of the cell cycle regulator NF-Y in cancer-associated pathways. This article is part of a Special Issue entitled: Nuclear Factor Y in Development and Disease, edited by Prof. Roberto Mantovani.
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Affiliation(s)
- Aymone Gurtner
- Department of Research, Advanced Diagnostics and Technological Innovation, UOSD SAFU, Regina Elena National Cancer Institute, Via Elio Chianesi 53, 00144, Rome, Italy
| | - Isabella Manni
- Department of Research, Advanced Diagnostics and Technological Innovation, UOSD SAFU, Regina Elena National Cancer Institute, Via Elio Chianesi 53, 00144, Rome, Italy
| | - Giulia Piaggio
- Department of Research, Advanced Diagnostics and Technological Innovation, UOSD SAFU, Regina Elena National Cancer Institute, Via Elio Chianesi 53, 00144, Rome, Italy.
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12
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Zhu A, Chen M, Zhang X, Storey KB. Gene structure, expression, and DNA methylation characteristics of sea cucumber cyclin B gene during aestivation. Gene 2016; 594:82-88. [PMID: 27601256 DOI: 10.1016/j.gene.2016.09.006] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2016] [Revised: 07/30/2016] [Accepted: 09/02/2016] [Indexed: 10/21/2022]
Abstract
The sea cucumber, Apostichopus japonicus, is a good model for studying environmentally-induced aestivation by a marine invertebrate. One of the central requirements of aestivation is the repression of energy-expensive cellular processes such as cell cycle progression. The present study identified the gene structure of the cell cycle regulator, cyclin B, and detected the expression levels of this gene over three stages of the annual aestivation-arousal cycle. Furthermore, the DNA methylation characteristics of cyclin B were analyzed in non-aestivation and deep-aestivation stages of sea cucumbers. We found that the cyclin B promoter contains a CpG island, three CCAAT-boxes and three cell cycle gene homology regions (CHRs). Application of qRT-PCR analysis showed significant downregulation of cyclin B transcript levels during deep-aestivation in comparison with non-aestivation in both intestine and longitudinal muscle, and these returned to basal levels after arousal from aestivation. Methylation analysis of the cyclin B core promoter revealed that its methylation level showed significant differences between non-aestivation and deep-aestivation stages (p<0.05) and interestingly, a positive correlation between Cyclin B transcripts expression and methylation levels of the core promoter was also observed. Our findings suggest that cell cycle progression may be reversibly arrested during aestivation as indicated by the changes in cyclin B expression levels and we propose that DNA methylation is one of the regulatory mechanisms involved in cyclin B transcriptional variation.
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Affiliation(s)
- Aijun Zhu
- Fisheries College, Ocean University of China, Qingdao, PR China; The Key Laboratory of Mariculture, Ministry of Education, Ocean University of China, Qingdao, PR China
| | - Muyan Chen
- Fisheries College, Ocean University of China, Qingdao, PR China; The Key Laboratory of Mariculture, Ministry of Education, Ocean University of China, Qingdao, PR China.
| | - Xiumei Zhang
- Fisheries College, Ocean University of China, Qingdao, PR China; The Key Laboratory of Mariculture, Ministry of Education, Ocean University of China, Qingdao, PR China
| | - Kenneth B Storey
- Institute of Biochemistry, Carleton University, 1125 Colonel By Drive, Ottawa, ON K1S 5B6, Canada
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13
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NF-YB Regulates Spermatogonial Stem Cell Self-Renewal and Proliferation in the Planarian Schmidtea mediterranea. PLoS Genet 2016; 12:e1006109. [PMID: 27304889 PMCID: PMC4909293 DOI: 10.1371/journal.pgen.1006109] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2015] [Accepted: 05/16/2016] [Indexed: 12/21/2022] Open
Abstract
Gametes are the source and carrier of genetic information, essential for the propagation of all sexually reproducing organisms. Male gametes are derived from a progenitor stem cell population called spermatogonial stem cells (SSCs). SSCs give rise to male gametes through the coordination of two essential processes: self-renewal to produce more SSCs, and differentiation to produce mature sperm. Disruption of this equilibrium can lead to excessive proliferation of SSCs, causing tumorigenesis, or can result in aberrant differentiation, leading to infertility. Little is known about how SSCs achieve the fine balance between self-renewal and differentiation, which is necessary for their remarkable output and developmental potential. To understand the mechanisms of SSC maintenance, we examine the planarian homolog of Nuclear Factor Y-B (NF-YB), which is required for the maintenance of early planarian male germ cells. Here, we demonstrate that NF-YB plays a role in the self-renewal and proliferation of planarian SSCs, but not in their specification or differentiation. Furthermore, we characterize members of the NF-Y complex in Schistosoma mansoni, a parasitic flatworm related to the free-living planarian. We find that the function of NF-YB in regulating male germ cell proliferation is conserved in schistosomes. This finding is especially significant because fecundity is the cause of pathogenesis of S. mansoni. Our findings can help elucidate the complex relationship between self-renewal and differentiation of SSCs, and may also have implications for understanding and controlling schistosomiasis.
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Benatti P, Belluti S, Miotto B, Neusiedler J, Dolfini D, Drac M, Basile V, Schwob E, Mantovani R, Blow JJ, Imbriano C. Direct non transcriptional role of NF-Y in DNA replication. BIOCHIMICA ET BIOPHYSICA ACTA 2016; 1863:673-85. [PMID: 26732297 DOI: 10.1016/j.bbamcr.2015.12.019] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2015] [Revised: 12/06/2015] [Accepted: 12/23/2015] [Indexed: 11/30/2022]
Abstract
NF-Y is a heterotrimeric transcription factor, which plays a pioneer role in the transcriptional control of promoters containing the CCAAT-box, among which genes involved in cell cycle regulation, apoptosis and DNA damage response. The knock-down of the sequence-specific subunit NF-YA triggers defects in S-phase progression, which lead to apoptotic cell death. Here, we report that NF-Y has a critical function in DNA replication progression, independent from its transcriptional activity. NF-YA colocalizes with early DNA replication factories, its depletion affects the loading of replisome proteins to DNA, among which Cdc45, and delays the passage from early to middle-late S phase. Molecular combing experiments are consistent with a role for NF-Y in the control of fork progression. Finally, we unambiguously demonstrate a direct non-transcriptional role of NF-Y in the overall efficiency of DNA replication, specifically in the DNA elongation process, using a Xenopus cell-free system. Our findings broaden the activity of NF-Y on a DNA metabolism other than transcription, supporting the existence of specific TFs required for proper and efficient DNA replication.
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Affiliation(s)
- Paolo Benatti
- Dipartimento di Scienze della Vita, Università di Modena e Reggio Emilia, via Campi 213/D, 41125 Modena, Italy
| | - Silvia Belluti
- Dipartimento di Scienze della Vita, Università di Modena e Reggio Emilia, via Campi 213/D, 41125 Modena, Italy; College of Life Sciences, University of Dundee, Dundee DD1 5EH, United Kingdom
| | - Benoit Miotto
- INSERM, U1016, Institut Cochin, Paris, France; CNRS, UMR8104, Paris, France; Université Paris Descartes, Sorbonne Paris Cité, Paris, France
| | - Julia Neusiedler
- College of Life Sciences, University of Dundee, Dundee DD1 5EH, United Kingdom
| | - Diletta Dolfini
- Dipartimento di Bioscienze, Università degli Studi di Milano, via Celoria 26, 20133 Milano, Italy
| | - Marjorie Drac
- Institute of Molecular Genetics, CNRS UMR5535 & Université Montpellier, 1919 route de Mende, 34293 Montpellier cedex 5, France
| | - Valentina Basile
- Dipartimento di Scienze della Vita, Università di Modena e Reggio Emilia, via Campi 213/D, 41125 Modena, Italy
| | - Etienne Schwob
- Institute of Molecular Genetics, CNRS UMR5535 & Université Montpellier, 1919 route de Mende, 34293 Montpellier cedex 5, France
| | - Roberto Mantovani
- Dipartimento di Bioscienze, Università degli Studi di Milano, via Celoria 26, 20133 Milano, Italy
| | - J Julian Blow
- College of Life Sciences, University of Dundee, Dundee DD1 5EH, United Kingdom
| | - Carol Imbriano
- Dipartimento di Scienze della Vita, Università di Modena e Reggio Emilia, via Campi 213/D, 41125 Modena, Italy.
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Basile V, Baruffaldi F, Dolfini D, Belluti S, Benatti P, Ricci L, Artusi V, Tagliafico E, Mantovani R, Molinari S, Imbriano C. NF-YA splice variants have different roles on muscle differentiation. BIOCHIMICA ET BIOPHYSICA ACTA-GENE REGULATORY MECHANISMS 2016; 1859:627-38. [PMID: 26921500 DOI: 10.1016/j.bbagrm.2016.02.011] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2015] [Revised: 02/17/2016] [Accepted: 02/18/2016] [Indexed: 11/19/2022]
Abstract
The heterotrimeric CCAAT-binding factor NF-Y controls the expression of a multitude of genes involved in cell cycle progression. NF-YA is present in two alternatively spliced isoforms, NF-YAs and NF-YAl, differing in 28 aminoacids in the N-terminal Q-rich activation domain. NF-YAs has been identified as a regulator of stemness and proliferation in mouse embryonic cells (mESCs) and human hematopoietic stem cells (hHSCs), whereas the role of NF-YAl is not clear. In the muscle system, NF-YA expression is observed in proliferating cells, but barely detectable in terminally differentiated cells in vitro and adult skeletal muscle in vivo. Here, we show that NF-YA inactivation in mouse myoblasts impairs both proliferation and differentiation. The overexpression of the two NF-YA isoforms differentially affects myoblasts fate: NF-YAs enhance cell proliferation, while NF-YAl boosts differentiation. The molecular mechanisms were investigated by expression profilings, detailing the opposite programs of the two isoforms. Bioinformatic analysis of the regulated promoters failed to detect a significant presence of CCAAT boxes in the regulated genes. NF-YAl activates directly Mef2D, Six genes, and p57kip2 (Cdkn1c), and indirectly the myogenic regulatory factors (MRFs). Specifically, Cdkn1c activation is induced by NF-Y binding to its CCAAT promoter and by reducing the expression of the lncRNA Kcnq1ot1, a negative regulator of Cdkn1c transcription. Overall, our results indicate that NF-YA alternative splicing is an influential muscle cell determinant, through direct regulation of selected cell cycle blocking genes, and, directly and indirectly, of muscle-specific transcription factors.
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Affiliation(s)
- Valentina Basile
- Dipartimento di Scienze della Vita, Università degli Studi di Modena e Reggio Emilia, Via Campi 213/D e Via Campi 287, Modena, Italy
| | - Fiorenza Baruffaldi
- Dipartimento di Scienze della Vita, Università degli Studi di Modena e Reggio Emilia, Via Campi 213/D, 41125 Modena, Italy
| | - Diletta Dolfini
- Dipartimento di Bioscienze, Università degli Studi di Milano, Via Celoria 26, 20133 Milano, Italy
| | - Silvia Belluti
- Dipartimento di Scienze della Vita, Università degli Studi di Modena e Reggio Emilia, Via Campi 213/D e Via Campi 287, Modena, Italy
| | - Paolo Benatti
- Dipartimento di Scienze della Vita, Università degli Studi di Modena e Reggio Emilia, Via Campi 213/D e Via Campi 287, Modena, Italy
| | - Laura Ricci
- Dipartimento di Scienze della Vita, Università degli Studi di Modena e Reggio Emilia, Via Campi 213/D e Via Campi 287, Modena, Italy
| | - Valentina Artusi
- Centro di Ricerche Genomiche, Dipartimento di Scienze della Vita, Università degli Studi di Modena e Reggio Emilia, Via Campi 287, 41125 Modena, Italy
| | - Enrico Tagliafico
- Centro di Ricerche Genomiche, Dipartimento di Scienze della Vita, Università degli Studi di Modena e Reggio Emilia, Via Campi 287, 41125 Modena, Italy
| | - Roberto Mantovani
- Dipartimento di Bioscienze, Università degli Studi di Milano, Via Celoria 26, 20133 Milano, Italy
| | - Susanna Molinari
- Dipartimento di Scienze della Vita, Università degli Studi di Modena e Reggio Emilia, Via Campi 213/D, 41125 Modena, Italy.
| | - Carol Imbriano
- Dipartimento di Scienze della Vita, Università degli Studi di Modena e Reggio Emilia, Via Campi 213/D e Via Campi 287, Modena, Italy.
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Lei CY, Wang W, Zhu YT, Fang WY, Tan WL. The decrease of cyclin B2 expression inhibits invasion and metastasis of bladder cancer. Urol Oncol 2015; 34:237.e1-10. [PMID: 26706119 DOI: 10.1016/j.urolonc.2015.11.011] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2015] [Revised: 07/04/2015] [Accepted: 11/14/2015] [Indexed: 11/29/2022]
Abstract
OBJECTIVE It has been shown that cyclin B2 is commonly overexpressed in many malignant tumors. This study aimed to investigate the potential role of cyclin B2 in bladder cancer. METHOD AND MATERIAL Fixed tissues for immunohistochemistry and fresh tissues for western blotting and quantitative real-time polymerase chain reaction assay were randomly selected from Nanfang hospital. Normal bladder urothelial cell and bladder cancer cell lines was stored in our laboratory, the bladder cancer cells were transfected to develop bladder cancer cell clones expressing decreased cyclin B2 levels, the clones were used for cell growth and metastasis experiments in vitro and in vivo. RESULTS Western blot and immunohistochemical analysis both showed that the cyclin B2 protein expression was higher in bladder urothelial carcinoma than in normal bladder mucosa, especially in invasive cancer. Real-time polymerase chain reaction showed that the cyclin B2 messenger RNA expression exhibited the same trend. Results of cell lines experiments also showed higher cyclin B2 expression in cancer cells. In vitro tests the decrease of cyclin B2 expression that had little effect on cell growth and cell cycling according to the MTT assay and the Edu assay, whereas in the Boyden chamber transwell assay, the cyclin B2 low-expressing clones significantly inhibits the cells׳ invasion and metastatic abilities. This result was consistent with the scratch-wound assay result showing that the target clone needed more time for healing the wound. The in vivo experiment in nude mice produced similar results, the lung and liver target cell metastasis nodules were smaller and less than those of the negative control by the hepatic subcapsular injection assay, and the mice of the target clone group has longer survival time in no intervention observed test. CONCLUSION These results indicate that the cyclin B2 was overexpressed in bladder cancer, and the down-regulation of cyclin B2 expression in bladder cancer greatly inhibits the cell׳s invasion and metastatic abilities, and it prolonged the survival time of nude mice in vivo.
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Affiliation(s)
- Cheng-yong Lei
- Department of Urology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong Province, China
| | - Wei Wang
- Department of Pathology, General Hospital of Guangzhou Military Command of PLA, Guangzhou, Guangdong Province, China
| | - Yong-tong Zhu
- Department of Obstetrics and Gynecology, Center for Reproductive Medicine, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong Province, China
| | - Wei-yi Fang
- Cancer Center, Hospital of Integrated Chinese and Western Medicine, Southern Medical University, Guangzhou, Guangdong Province, China
| | - Wan-long Tan
- Department of Urology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong Province, China.
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Mojsin M, Topalovic V, Marjanovic Vicentic J, Stevanovic M. Transcription factor NF-Y inhibits cell growth and decreases SOX2 expression in human embryonal carcinoma cell line NT2/D1. BIOCHEMISTRY (MOSCOW) 2015; 80:202-7. [PMID: 25756534 DOI: 10.1134/s0006297915020066] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Transcription factor NF-Y belongs to the embryonic stem cell transcription factor circuitry due to its role in the regulation of cell proliferation. We investigated the role of NF-Y in pluripotency maintenance using NT2/D1 cells as one of the best-characterized human embryonal carcinoma cell line. We investigated the efficiency of protein transduction and analyzed the effects of forced expression of short isoform of NF-Y A-subunit (NF-YAs) on NT2/D1 cell growth and expression of SOX2. We found that protein transduction is an efficient method for NF-Y overexpression in NT2/D1 cells. Next, we analyzed the effect of NF-YAs overexpression on NT2/D1 cell viability and detected significant reduction in cell growth. The negative effect of NF-YAs overexpression on NT2/D1 cell pluripotency maintenance was confirmed by the decrease in the level of the pluripotency marker SOX2. Finally, we checked the p53 status and determined that the NF-Y-induced inhibition of NT2/D1 cell growth is p53-independent.
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Affiliation(s)
- M Mojsin
- Institute of Molecular Genetics and Genetic Engineering, University of Belgrade, Belgrade, 11010, Serbia.
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18
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Jiang X, Nevins JR, Shats I, Chi JT. E2F1-Mediated Induction of NFYB Attenuates Apoptosis via Joint Regulation of a Pro-Survival Transcriptional Program. PLoS One 2015; 10:e0127951. [PMID: 26039627 PMCID: PMC4454684 DOI: 10.1371/journal.pone.0127951] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2014] [Accepted: 04/22/2015] [Indexed: 11/18/2022] Open
Abstract
The E2F1 transcription factor regulates cell proliferation and apoptosis through the control of a considerable variety of target genes. Previous work has detailed the role of other transcription factors in mediating the specificity of E2F function. Here we identify the NF-YB transcription factor as a novel direct E2F1 target. Genome-wide expression analysis of the effects of NFYB knockdown on E2F1-mediated transcription identified a large group of genes that are co-regulated by E2F1 and NFYB. We also provide evidence that knockdown of NFYB enhances E2F1-induced apoptosis, suggesting a pro-survival function of the NFYB/E2F1 joint transcriptional program. Bioinformatic analysis suggests that deregulation of these NFY-dependent E2F1 target genes might play a role in sarcomagenesis as well as drug resistance.
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Affiliation(s)
- Xiaolei Jiang
- Duke Center for Genomic and Computational Biology, Duke University, Durham, North Carolina, United States of America
- Department of Molecular Genetics and Microbiology, Duke University, Durham, North Carolina, United States of America
| | - Joseph Roy Nevins
- Department of Molecular Genetics and Microbiology, Duke University, Durham, North Carolina, United States of America
| | - Igor Shats
- Duke Center for Genomic and Computational Biology, Duke University, Durham, North Carolina, United States of America
- Department of Biomedical Engineering, Duke University Medical Center, Durham, North Carolina, United States of America
- * E-mail: (JTC); (IS)
| | - Jen-Tsan Chi
- Duke Center for Genomic and Computational Biology, Duke University, Durham, North Carolina, United States of America
- Department of Molecular Genetics and Microbiology, Duke University, Durham, North Carolina, United States of America
- * E-mail: (JTC); (IS)
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19
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Shi Z, Chiang CI, Labhart P, Zhao Y, Yang J, Mistretta TA, Henning SJ, Maity SN, Mori-Akiyama Y. Context-specific role of SOX9 in NF-Y mediated gene regulation in colorectal cancer cells. Nucleic Acids Res 2015; 43:6257-69. [PMID: 26040697 PMCID: PMC4513854 DOI: 10.1093/nar/gkv568] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2014] [Accepted: 05/19/2015] [Indexed: 11/18/2022] Open
Abstract
Roles for SOX9 have been extensively studied in development and particular emphasis has been placed on SOX9 roles in cell lineage determination in a number of discrete tissues. Aberrant expression of SOX9 in many cancers, including colorectal cancer, suggests roles in these diseases as well and recent studies have suggested tissue- and context-specific roles of SOX9. Our genome wide approach by chromatin immunoprecipitation sequencing (ChIP-seq) in human colorectal cancer cells identified a number of physiological targets of SOX9, including ubiquitously expressed cell cycle regulatory genes, such as CCNB1 and CCNB2, CDK1, and TOP2A. These novel high affinity-SOX9 binding peaks precisely overlapped with binding sites for histone-fold NF-Y transcription factor. Furthermore, our data showed that SOX9 is recruited by NF-Y to these promoters of cell cycle regulatory genes and that SOX9 is critical for the full function of NF-Y in activation of the cell cycle genes. Mutagenesis analysis and invitro binding assays provided additional evidence to show that SOX9 affinity is through NF-Y and that SOX9 DNA binding domain is not necessary for SOX9 affinity to those target genes. Collectively, our results reveal possibly a context-dependent, non-classical regulatory role for SOX9.
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Affiliation(s)
- Zhongcheng Shi
- Department of Pathology & Immunology, Baylor College of Medicine, Texas Children's Hospital, 1102 Bates Street, Suite FC 830.27, Houston, TX 77030-2399, USA
| | - Chi-I Chiang
- Department of Pathology & Immunology, Baylor College of Medicine, Texas Children's Hospital, 1102 Bates Street, Suite FC 830.27, Houston, TX 77030-2399, USA
| | - Paul Labhart
- Active Motif, 1914 Palomar Oaks Way, Suite 150, Carlsbad, CA 92008, USA
| | - Yanling Zhao
- Department of Pediatrics, Baylor College of Medicine, Texas Children's Cancer Center, Houston, TX 77030-2399, USA
| | - Jianhua Yang
- Department of Pediatrics, Baylor College of Medicine, Texas Children's Cancer Center, Houston, TX 77030-2399, USA
| | - Toni-Ann Mistretta
- Department of Pathology & Immunology, Baylor College of Medicine, Texas Children's Hospital, 1102 Bates Street, Suite FC 830.27, Houston, TX 77030-2399, USA
| | - Susan J Henning
- Department of Medicine, Cell Biology & Physiology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-7032, USA
| | - Sankar N Maity
- Department of Genitourinary Medical Oncology-Research, Division of Cancer Medicine, University of Texas M. D. Anderson Cancer Center, Houston, TX 77030, USA
| | - Yuko Mori-Akiyama
- Department of Pathology & Immunology, Baylor College of Medicine, Texas Children's Hospital, 1102 Bates Street, Suite FC 830.27, Houston, TX 77030-2399, USA
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iRegulon: from a gene list to a gene regulatory network using large motif and track collections. PLoS Comput Biol 2014; 10:e1003731. [PMID: 25058159 PMCID: PMC4109854 DOI: 10.1371/journal.pcbi.1003731] [Citation(s) in RCA: 608] [Impact Index Per Article: 60.8] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2014] [Accepted: 05/27/2014] [Indexed: 01/17/2023] Open
Abstract
Identifying master regulators of biological processes and mapping their downstream gene networks are key challenges in systems biology. We developed a computational method, called iRegulon, to reverse-engineer the transcriptional regulatory network underlying a co-expressed gene set using cis-regulatory sequence analysis. iRegulon implements a genome-wide ranking-and-recovery approach to detect enriched transcription factor motifs and their optimal sets of direct targets. We increase the accuracy of network inference by using very large motif collections of up to ten thousand position weight matrices collected from various species, and linking these to candidate human TFs via a motif2TF procedure. We validate iRegulon on gene sets derived from ENCODE ChIP-seq data with increasing levels of noise, and we compare iRegulon with existing motif discovery methods. Next, we use iRegulon on more challenging types of gene lists, including microRNA target sets, protein-protein interaction networks, and genetic perturbation data. In particular, we over-activate p53 in breast cancer cells, followed by RNA-seq and ChIP-seq, and could identify an extensive up-regulated network controlled directly by p53. Similarly we map a repressive network with no indication of direct p53 regulation but rather an indirect effect via E2F and NFY. Finally, we generalize our computational framework to include regulatory tracks such as ChIP-seq data and show how motif and track discovery can be combined to map functional regulatory interactions among co-expressed genes. iRegulon is available as a Cytoscape plugin from http://iregulon.aertslab.org. Gene regulatory networks control developmental, homeostatic, and disease processes by governing precise levels and spatio-temporal patterns of gene expression. Determining their topology can provide mechanistic insight into these processes. Gene regulatory networks consist of interactions between transcription factors and their direct target genes. Each regulatory interaction represents the binding of the transcription factor to a specific DNA binding site near its target gene. Here we present a computational method, called iRegulon, to identify master regulators and direct target genes in a human gene signature, i.e. a set of co-expressed genes. iRegulon relies on the analysis of the regulatory sequences around each gene in the gene set to detect enriched TF motifs or ChIP-seq peaks, using databases of nearly 10.000 TF motifs and 1000 ChIP-seq data sets or “tracks”. Next, it associates enriched motifs and tracks with candidate transcription factors and determines the optimal subset of direct target genes. We validate iRegulon on ENCODE data, and use it in combination with RNA-seq and ChIP-seq data to map a p53 downstream network with new predicted co-factors and targets. iRegulon is available as a Cytoscape plugin, supporting human, mouse, and Drosophila genes, and provides access to hundreds of cancer-related TF-target subnetworks or “regulons”.
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Di Carlo S, Politano G, Savino A, Benso A. A systematic analysis of a mi-RNA inter-pathway regulatory motif. J Clin Bioinforma 2013; 3:20. [PMID: 24152805 PMCID: PMC3875894 DOI: 10.1186/2043-9113-3-20] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2013] [Accepted: 10/16/2013] [Indexed: 12/23/2022] Open
Abstract
BACKGROUND The continuing discovery of new types and functions of small non-coding RNAs is suggesting the presence of regulatory mechanisms far more complex than the ones currently used to study and design Gene Regulatory Networks. Just focusing on the roles of micro RNAs (miRNAs), they have been found to be part of several intra-pathway regulatory motifs. However, inter-pathway regulatory mechanisms have been often neglected and require further investigation. RESULTS In this paper we present the result of a systems biology study aimed at analyzing a high-level inter-pathway regulatory motif called Pathway Protection Loop, not previously described, in which miRNAs seem to play a crucial role in the successful behavior and activation of a pathway. Through the automatic analysis of a large set of public available databases, we found statistical evidence that this inter-pathway regulatory motif is very common in several classes of KEGG Homo Sapiens pathways and concurs in creating a complex regulatory network involving several pathways connected by this specific motif. The role of this motif seems also confirmed by a deeper review of other research activities on selected representative pathways. CONCLUSIONS Although previous studies suggested transcriptional regulation mechanism at the pathway level such as the Pathway Protection Loop, a high-level analysis like the one proposed in this paper is still missing. The understanding of higher-level regulatory motifs could, as instance, lead to new approaches in the identification of therapeutic targets because it could unveil new and "indirect" paths to activate or silence a target pathway. However, a lot of work still needs to be done to better uncover this high-level inter-pathway regulation including enlarging the analysis to other small non-coding RNA molecules.
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Affiliation(s)
- Stefano Di Carlo
- Department of Control and Computer Engineering, Politecnico di Torino, Torino, IT, Italy
| | - Gianfranco Politano
- Department of Control and Computer Engineering, Politecnico di Torino, Torino, IT, Italy
| | - Alessandro Savino
- Consorzio Interuniversitario Nazionale per l'Informatica, Verres (AO), IT, Italy
| | - Alfredo Benso
- Department of Control and Computer Engineering, Politecnico di Torino, Torino, IT, Italy.,Consorzio Interuniversitario Nazionale per l'Informatica, Verres (AO), IT, Italy
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22
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Chen J. Impaired cardiovascular function caused by different stressors elicits a common pathological and transcriptional response in zebrafish embryos. Zebrafish 2013; 10:389-400. [PMID: 23837677 DOI: 10.1089/zeb.2013.0875] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
Zebrafish embryos have been widely used to study the genes and processes needed for normal vertebrate heart development. We recently observed that exposure to 2,3,7,8-tetra-chlorodibenzo-p-dioxin (TCDD) or retinoic acid (RA) produces very similar signs of heart failure in developing zebrafish via divergent molecular pathways. The fact that diverse stressors and mutations cause severe pericardial edema and circulatory collapse in developing zebrafish has been largely unexplored. We hypothesized that unrelated chemicals can trigger a common pathological response leading to the same end-stage heart failure. To test this hypothesis, we compared the effects of TCDD, RA, carbaryl, valproic acid, and morpholino oligonucleotide (MO) knockdown of TBX5 on the developing heart in zebrafish embryos. These model stressors have all been previously reported to affect zebrafish heart development, and elicited very similar signs of embryonic heart failure. Microarray analysis showed that one cluster of 92 transcripts affected by these different treatments was significantly downregulated by all treatments. This gene cluster is composed of transcripts required for chromosome assembly, DNA replication, and cell cycle progression. We refer to this cluster as the cell cycle gene cluster (CCGC). Immunohistochemistry revealed that downregulation of the CCGC precedes a halt in cardiomyocyte proliferation in the hearts of zebrafish exposed to any of the treatments. Previous work has shown that the initial response to TCDD is a decrease in cardiac output. Since this precedes the signs of edema, heart failure, and fall in CCGC expression, we postulated that any factor that decreases cardiac output will produce the same syndrome of heart failure responses. To test this, we used MO knockdown of cardiac troponin T2 (TNNT2) to specifically block contractility. The TNNT2-MO produced exactly the same signs of cardiotoxicity as the other treatments, including downregulation of the signature CCGC. Our results indicate that agents altering cardiac output can have amplified consequences during specific periods in development.
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Affiliation(s)
- Jing Chen
- Institute of Life Sciences, Fujian Normal University, Fuzhou, Fujian, China.
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Garipov A, Li H, Bitler BG, Thapa RJ, Balachandran S, Zhang R. NF-YA underlies EZH2 upregulation and is essential for proliferation of human epithelial ovarian cancer cells. Mol Cancer Res 2013; 11:360-9. [PMID: 23360797 DOI: 10.1158/1541-7786.mcr-12-0661] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Epithelial ovarian cancer (EOC) accounts for the most gynecologic malignancy-associated deaths in the United States. Enhancer of zeste homolog 2 (EZH2), which silences gene expression through generating trimethylation on lysine 27 residue of histone H3 (H3K27Me3), is often overexpressed in EOCs and has been suggested as a therapeutic target. However, the mechanism underlying EZH2 overexpression in EOCs is unknown. Here, we show that EZH2 is upregulated at the transcription level, and two CCAAT boxes in the proximal regions of the human EZH2 gene promoter are critical for its transcription in EOC cells. Indeed, NF-YA, the regulatory subunit of the CCAAT-binding transcription factor NF-Y, is expressed at higher levels in human EOCs than in primary human ovarian surface epithelial (HOSE) cells. In addition, there is a positive correlation between expression of NF-YA and EZH2 in EOCs. Notably, high NF-YA expression predicts shorter overall survival in patients with EOCs. The association of NF-YA with the promoter of the human EZH2 gene is enhanced in human EOC cells compared with primary HOSE cells. Significantly, knockdown of NF-YA downregulates EZH2, decreases H3K27Me3 levels, and suppresses the growth of human EOC cells both in vitro and in a xenograft mouse model. Notably, NF-YA knockdown induces apoptosis of EOC cells and ectopic EZH2 expression partially rescues apoptosis induced by NF-YA knockdown. Together, these data reveal that NF-Y is a key regulator of EZH2 expression and is required for EOC cell proliferation, thus representing a novel target for developing EOC therapeutics.
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Affiliation(s)
- Azat Garipov
- The Wistar Institute, Fox Chase Cancer Center, Philadelphia, Pennsylvania, Philadelphia, PA 19104, USA
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Nakayama Y, Yamaguchi N. Role of cyclin B1 levels in DNA damage and DNA damage-induced senescence. INTERNATIONAL REVIEW OF CELL AND MOLECULAR BIOLOGY 2013; 305:303-37. [PMID: 23890385 DOI: 10.1016/b978-0-12-407695-2.00007-x] [Citation(s) in RCA: 71] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The cyclin B1-Cdk1 complex is a key regulator of mitotic entry. A large number of proteins are phosphorylated by the cyclin B1-Cdk1 complex prior to mitotic entry. Regulation of the mitotic events is linked to the control of the activity of the cyclin B1-Cdk1 complex to make cells enter mitosis, arrest at G2-phase, or skip mitosis. The roles of cyclin B1 levels in DNA damage are described. The ATM/ATR pathway acts as a molecular switch for regulating cell fates, flipping between cell death via progress into mitosis and polyploidization via sustained G2 arrest upon DNA damage, where cyclin B1 degradation is important for inducing polyploidization. The decrease in cyclin B1 levels that is induced by DNA damage leads to polyploidization in DNA damage-induced senescence. A useful method for monitoring the expression level of cyclin B1 throughout cell cycle progression in living cells is also presented.
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Affiliation(s)
- Yuji Nakayama
- Department of Biochemistry & Molecular Biology, Kyoto Pharmaceutical University, Kyoto, Japan.
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25
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Quaas M, Müller GA, Engeland K. p53 can repress transcription of cell cycle genes through a p21(WAF1/CIP1)-dependent switch from MMB to DREAM protein complex binding at CHR promoter elements. Cell Cycle 2012. [PMID: 23187802 PMCID: PMC3562311 DOI: 10.4161/cc.22917] [Citation(s) in RCA: 83] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
The tumor suppressor p53 plays an important role in cell cycle arrest by downregulating transcription. Many genes repressed by p53 code for proteins with functions in G₂/M. A large portion of these genes is controlled by cell cycle-dependent elements (CDE) and cell cycle genes homology regions (CHR) in their promoters. Cyclin B2 is an example of such a gene, with a function at the transition from G₂ to mitosis. We find that p53-dependent downregulation of cyclin B2 promoter activity is dependent on an intact CHR element. In the presence of high levels of p53 or p21WAF1/CIP1, protein binding to the CHR switches from MMB to DREAM complex by shifting MuvB core-associated proteins from B-Myb to E2F4/DP1/p130. The results suggest a model for p53-dependent transcriptional repression by which p53 directly activates p21WAF1/CIP1. The inhibitor then prevents further phosphorylation of p130 by cyclin-dependent kinases. The presence of hypophosphorylated pocket proteins shifts the equilibrium for complex formation from MMB to DREAM. In the case of promoters that do not hold CDE or E2F elements, binding of DREAM and MMB solely relies on a CHR site. Thus, p53 can repress target genes indirectly through CHR elements.
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Affiliation(s)
- Marianne Quaas
- Department of Molecular Oncology, Medical School, University of Leipzig, Leipzig, Germany
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26
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Goeman F, Manni I, Artuso S, Ramachandran B, Toietta G, Bossi G, Rando G, Cencioni C, Germoni S, Straino S, Capogrossi MC, Bacchetti S, Maggi A, Sacchi A, Ciana P, Piaggio G. Molecular imaging of nuclear factor-Y transcriptional activity maps proliferation sites in live animals. Mol Biol Cell 2012; 23:1467-74. [PMID: 22379106 PMCID: PMC3327325 DOI: 10.1091/mbc.e12-01-0039] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
Abstract
The activity of the nuclear factor-Y (NF-Y) transcription factor is restricted to proliferating cells in vitro. We engineered transgenic mice that enabled bioluminescence imaging of NF-Y activity in every area of the body. We visualized areas of proliferation, and we highlight for the first time a role of NF-Y activity in hepatocyte proliferation during liver regeneration. In vivo imaging involving the use of genetically engineered animals is an innovative powerful tool for the noninvasive assessment of the molecular and cellular events that are often targets of therapy. On the basis of the knowledge that the activity of the nuclear factor-Y (NF-Y) transcription factor is restricted in vitro to proliferating cells, we have generated a transgenic reporter mouse, called MITO-Luc (for mitosis-luciferase), in which an NF-Y–dependent promoter controls luciferase expression. In these mice, bioluminescence imaging of NF-Y activity visualizes areas of physiological cell proliferation and regeneration during response to injury. Using this tool, we highlight for the first time a role of NF-Y activity on hepatocyte proliferation during liver regeneration. MITO-Luc reporter mice should facilitate investigations into the involvement of genes in cell proliferation and provide a useful model for studying aberrant proliferation in disease pathogenesis. They should be also useful in the development of new anti/proproliferative drugs and assessment of their efficacy and side effects on nontarget tissues.
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Affiliation(s)
- Frauke Goeman
- Experimental Oncology Department, Istituto Regina Elena, 00158 Rome, Italy
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27
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Abstract
HSC function depends on the tight control of proliferation and the balance between self-renewal and differentiation. Here, we report that the trimeric transcription factor NF-Y is critical for the survival of cycling, but not quiescent HSCs. With the use of a conditional knockout mouse model, we demonstrate that NF-Ya deletion creates an accumulation of HSCs in G(2)/M and prompts apoptosis, causing hematopoietic failure and death of the animal. These defects are accompanied by the dysregulation of multiple genes that influence cell cycle control (cyclin b1 and p21), apoptosis (Bcl-2), and self-renewal (HoxB4, Notch1, Bmi-1) and are independent of p53. Our results identify NF-Y as a pivotal upstream participant in a regulatory network necessary for the preservation of cycling HSCs.
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28
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Müller GA, Quaas M, Schümann M, Krause E, Padi M, Fischer M, Litovchick L, DeCaprio JA, Engeland K. The CHR promoter element controls cell cycle-dependent gene transcription and binds the DREAM and MMB complexes. Nucleic Acids Res 2011; 40:1561-78. [PMID: 22064854 PMCID: PMC3287175 DOI: 10.1093/nar/gkr793] [Citation(s) in RCA: 84] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Cell cycle-dependent gene expression is often controlled on the transcriptional level. Genes like cyclin B, CDC2 and CDC25C are regulated by cell cycle-dependent element (CDE) and cell cycle genes homology region (CHR) promoter elements mainly through repression in G(0)/G(1). It had been suggested that E2F4 binding to CDE sites is central to transcriptional regulation. However, some promoters are only controlled by a CHR. We identify the DREAM complex binding to the CHR of mouse and human cyclin B2 promoters in G(0). Association of DREAM and cell cycle-dependent regulation is abrogated when the CHR is mutated. Although E2f4 is part of the complex, a CDE is not essential but can enhance binding of DREAM. We show that the CHR element is not only necessary for repression of gene transcription in G(0)/G(1), but also for activation in S, G(2) and M phases. In proliferating cells, the B-myb-containing MMB complex binds the CHR of both promoters independently of the CDE. Bioinformatic analyses identify many genes which contain conserved CHR elements in promoters binding the DREAM complex. With Ube2c as an example from that screen, we show that inverse CHR sites are functional promoter elements that can bind DREAM and MMB. Our findings indicate that the CHR is central to DREAM/MMB-dependent transcriptional control during the cell cycle.
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Affiliation(s)
- Gerd A Müller
- Molecular Oncology, Medical School, University of Leipzig, Semmelweisstrasse 14, 04103 Leipzig, Germany
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29
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van der Watt PJ, Leaner VD. The nuclear exporter, Crm1, is regulated by NFY and Sp1 in cancer cells and repressed by p53 in response to DNA damage. BIOCHIMICA ET BIOPHYSICA ACTA 2011; 1809:316-26. [PMID: 21683812 DOI: 10.1016/j.bbagrm.2011.05.017] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2011] [Revised: 05/20/2011] [Accepted: 05/27/2011] [Indexed: 01/19/2023]
Abstract
The nuclear exporter protein, Crm1, plays a key role in normal cell functioning, mediating the nucleo-cytoplasmic transport of cargo proteins. Elevated Crm1 expression has recently been identified in various tumours; however, the mechanisms driving its expression have not been investigated to date. In this study we identified the Crm1 promoter and factors associated with its elevated expression and with its repression under conditions of DNA damage. The -1405 to +99 Crm1 promoter region was found to be significantly more active in cancer and transformed cells compared to normal, and the -175 to +99 region identified as responsible for the differential activity. Mutation of two CCAAT boxes and a GC box within this region significantly diminished Crm1 promoter activity and ChIP analysis revealed binding of NFY and Sp1 to these sites, with increased binding in transformed and cancer cells. In addition, p53 was found to repress Crm1 promoter activity, after induction with doxorubicin, with p53 siRNA blocking the effect. Crm1 promoter constructs with mutated CCAAT boxes were significantly less responsive to p53 repression, and in vivo binding of NFY to the CCAAT boxes was diminished upon p53 binding, suggesting that p53 mediates repression of the Crm1 promoter via interfering with NFY. This was confirmed using NFY knock-down cells, in which Crm1 promoter activity was significantly less responsive to p53. In vitro EMSAs revealed that NFY and p53 bind the CCAAT boxes as a single complex under conditions of DNA damage. In summary, this study is a first to analyse Crm1 promoter regulation and reveals NFY and Sp1 as contributors to Crm1 overexpression in cancer. In addition, this study reveals that Crm1 transcription is inhibited by DNA damage and that the mechanism of inhibition involves p53 interfering with NFY function.
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Affiliation(s)
- Pauline J van der Watt
- Institute of Infectious Disease and Molecular Medicine, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa
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30
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Benatti P, Dolfini D, Viganò A, Ravo M, Weisz A, Imbriano C. Specific inhibition of NF-Y subunits triggers different cell proliferation defects. Nucleic Acids Res 2011; 39:5356-68. [PMID: 21415014 PMCID: PMC3141247 DOI: 10.1093/nar/gkr128] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Regulated gene expression is essential for a proper progression through the cell cycle. The transcription factor NF-Y has a fundamental function in transcriptional regulation of cell cycle genes, particularly of G2/M genes. In order to investigate common and distinct functions of NF-Y subunits in cell cycle regulation, NF-YA, NF-YB and NF-YC have been silenced by shRNAs in HCT116 cells. NF-YA loss led to a delay in S-phase progression, DNA damage and apoptosis: we showed the activation of the replication checkpoint, through the recruitment of Δp53 and of the replication proteins PCNA and Mcm7 to chromatin. Differently, NF-YB depletion impaired cells from exiting G2/M, but did not interfere with S-phase progression. Gene expression analysis of NF-YA and NF-YB inactivated cells highlighted a common set of hit genes, as well as a plethora of uncommon genes, unveiling a different effect of NF-Y subunits loss on NF-Y binding to its target genes. Chromatin extracts and ChIP analysis showed that NF-YA depletion was more effective than NF-YB in hitting NF-Y recruitment to CCAAT-promoters. Our data suggest a critical role of NF-Y expression, highlighting that the lack of the single subunits are differently perceived by the cells, which activate diverse cell cycle blocks and signaling pathways.
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Affiliation(s)
- Paolo Benatti
- Dipartimento di Biologia, Università di Modena e Reggio Emilia, via Campi 213/D, 41125 Modena, Italy
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31
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Gurtner A, Fuschi P, Martelli F, Manni I, Artuso S, Simonte G, Ambrosino V, Antonini A, Folgiero V, Falcioni R, Sacchi A, Piaggio G. Transcription factor NF-Y induces apoptosis in cells expressing wild-type p53 through E2F1 upregulation and p53 activation. Cancer Res 2010; 70:9711-20. [PMID: 20952509 DOI: 10.1158/0008-5472.can-10-0721] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The CCAAT-binding transcription factor NF-Y plays a central role in regulating cellular proliferation by controlling the expression of genes required for cell-cycle progression such as cyclin A, cyclin B1, cyclin B2, cdc25A, cdc25C, and cdk1. Here we show that unrestricted NF-Y activity leads to apoptosis in an E2F1- and wild-type p53 (wtp53)-dependent manner. Unrestricted NF-Y activity induced an increase in E2F1 mRNA and protein levels. Furthermore, NF-Y directly bound the E2F1 promoter and this correlated with the appearance of open chromatin marks. The ability of NF-Y to induce apoptosis was impaired in cells lacking E2F1 and wtp53. Moreover, NF-Y overexpression elicited phosphorylation of wt p53Ser18 in an E2F1-dependent manner. Our findings establish that NF-Y acts upstream of E2F1 in p53-mediated apoptosis.
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Affiliation(s)
- Aymone Gurtner
- Experimental Oncology Department, Istituto Regina Elena, IRCCS, Rome, Italy
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32
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Wang W, Li Q, Bagchi IC, Bagchi MK. The CCAAT/enhancer binding protein beta is a critical regulator of steroid-induced mitotic expansion of uterine stromal cells during decidualization. Endocrinology 2010; 151:3929-40. [PMID: 20501671 PMCID: PMC2940513 DOI: 10.1210/en.2009-1437] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
During early pregnancy, the concerted actions of the maternal steroid hormones, estrogen and progesterone, promote a unique process known as decidualization, which involves extensive proliferation and differentiation of uterine stromal cells. The molecular pathways underlying this hormonally induced cellular transformation, an essential prerequisite for embryo implantation, remain poorly understood. We previously identified CCAAT/enhancer binding protein beta (C/EBPbeta) as a target of steroid regulation in the uterus. Uteri of mice lacking C/EBPbeta failed to undergo decidualization. In the present study, analyses of C/EBPbeta-null uteri indicated that loss of this factor leads to a block in stromal cell proliferation in response to a decidual stimulation. The mutant stromal cells entered S phase of the cell cycle and completed DNA synthesis but were unable to execute mitosis. Further analysis revealed that C/EBPbeta facilitates the transition of these cells into mitosis by binding directly to the cyclin B2 promoter to regulate its expression. The expression of cdc25C, a phosphatase that maintains the active state of the cyclin B-cyclin-dependent kinase complex during mitosis, is also strongly suppressed in C/EBPbeta-null stromal cells. Furthermore, the expression of the tumor suppressor p53 and the cell cycle inhibitors p21 and p27 was markedly elevated in C/EBPbeta-null stromal cells before the mitotic phase, uncovering additional mechanisms by which C/EBPbeta controls G2 to M transition. Collectively, these results revealed that C/EBPbeta mediates the effects of steroid hormones during decidualization by modulating the expression of multiple key cell cycle regulatory factors that control the G2 to M transition of the proliferating uterine stromal cells.
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Affiliation(s)
- Wei Wang
- Department of Molecular and Integrative Physiology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
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33
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Wu T, Zhang X, Huang X, Yang Y, Hua X. Regulation of cyclin B2 expression and cell cycle G2/m transition by menin. J Biol Chem 2010; 285:18291-300. [PMID: 20404349 DOI: 10.1074/jbc.m110.106575] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Multiple endocrine neoplasia type 1 (MEN1) results from mutations in tumor suppressor gene Men1, which encodes nuclear protein menin. Menin up-regulates certain cyclin-dependent kinase inhibitors through increasing histone H3 lysine 4 (H3K4) methylation and inhibits G(0)/G(1) to S phase transition. However, little is known as to whether menin controls G(2)/M-phase transition, another important cell cycle checkpoint. Here, we show that menin expression delays G(2)/M phase transition and reduces expression of Ccnb2 (encoding cyclin B2). Menin associates with the promoter of Ccnb2 and reduces histone H3 acetylation, a positive chromatin marker for gene transcription, at the Ccnb2 locus. Moreover, Men1 ablation leads to an increase in cyclin B2 expression, histone H3 acetylation at the Ccnb2 locus, and G(2)/M transition. In contrast, knockdown of cyclin B2 diminishes the number of cells at M phase and reduces cell proliferation. Furthermore, menin interferes with binding of certain positive transcriptional regulators, such as nuclear factor Y (NF-Y), E2 factors (E2Fs), and histone acetyltransferase CREB (cAMP-response element-binding protein)-binding protein (CBP) to the Ccnb2 locus. Notably, MEN1 disease-related mutations, A242V and L22R, abrogate the ability of menin to repress cyclin B2 expression and G(2)/M transition. Both of the mutants fail to reduce the acetylated level of the Ccnb2 locus. Together, these results suggest that menin-mediated repression of cyclin B2 is crucial for inhibiting G(2)/M transition and cell proliferation through a previously unrecognized molecular mechanism for menin-induced suppression of MEN1 tumorigenesis.
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Affiliation(s)
- Ting Wu
- Department of Biomedical Sciences, School of Life Science,Medical College, Xiamen University, Xiamen 361005, China
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34
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Müller GA, Engeland K. The central role of CDE/CHR promoter elements in the regulation of cell cycle-dependent gene transcription. FEBS J 2009; 277:877-93. [PMID: 20015071 DOI: 10.1111/j.1742-4658.2009.07508.x] [Citation(s) in RCA: 98] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The cell cycle-dependent element (CDE) and the cell cycle genes homology region (CHR) control the transcription of genes with maximum expression in G(2) phase and in mitosis. Promoters of these genes are repressed by proteins binding to CDE/CHR elements in G(0) and G(1) phases. Relief from repression begins in S phase and continues into G(2) phase and mitosis. Generally, CDE sites are located four nucleotides upstream of CHR elements in TATA-less promoters of genes such as Cdc25C, Cdc2 and cyclin A. However, expression of some other genes, such as human cyclin B1 and cyclin B2, has been shown to be controlled only by a CHR lacking a functional CDE. To date, it is not fully understood which proteins bind to and control CDE/CHR-containing promoters. Recently, components of the DREAM complex were shown to be involved in CDE/CHR-dependent transcriptional regulation. In addition, the expression of genes regulated by CDE/CHR elements is mostly achieved through CCAAT-boxes, which bind heterotrimeric NF-Y proteins as well as the histone acetyltransferase p300. Importantly, many CDE/CHR promoters are downregulated by the tumor suppressor p53. In this review, we define criteria for CDE/CHR-regulated promoters and propose to distinguish two classes of CDE/CHR-regulated genes. The regulation through transcription factors potentially binding to the CDE/CHR is discussed, and recently discovered links to central pathways regulated by E2F, the pRB family and p53 are highlighted.
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Affiliation(s)
- Gerd A Müller
- Molecular Oncology, Department of Obstetrics and Gynecology, University of Leipzig, Germany
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35
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Węsierska-Gądek J, Kryštof V. Selective Cyclin-Dependent Kinase Inhibitors Discriminating between Cell Cycle and Transcriptional Kinases. Ann N Y Acad Sci 2009; 1171:228-41. [DOI: 10.1111/j.1749-6632.2009.04726.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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36
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Haupt S, di Agostino S, Mizrahi I, Alsheich-Bartok O, Voorhoeve M, Damalas A, Blandino G, Haupt Y. Promyelocytic leukemia protein is required for gain of function by mutant p53. Cancer Res 2009; 69:4818-26. [PMID: 19487292 DOI: 10.1158/0008-5472.can-08-4010] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Mutations in the p53 tumor suppressor are the most common genetic events in human cancer. These mutations not only result in a loss of wild-type p53 activity, but can also lead to a gain of new oncogenic properties. Understanding how these gained functions are regulated is in its infancy. In this study, we show that the promyelocytic leukemia (PML) protein is an important regulator of mutant p53. We show that PML interacts with mutant p53. Importantly, PML enhances the transcriptional activity of mutant p53. Unexpectedly, PML is required for the proliferation and colony formation of cancer cells bearing mutant p53. Down-regulation of PML expression inhibits the growth of mutant p53-expressing cancer cells, predominantly by promoting cell cycle arrest. Our results suggest that the tumor suppression function of PML depends on the status of p53. In the context of mutant p53, PML enhances its cancer-promoting activities.
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Affiliation(s)
- Sue Haupt
- Research Division, The Peter MacCallum Cancer Centre, East Melbourne, Victoria, Australia.
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37
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De Martino I, Visone R, Wierinckx A, Palmieri D, Ferraro A, Cappabianca P, Chiappetta G, Forzati F, Lombardi G, Colao A, Trouillas J, Fedele M, Fusco A. HMGA proteins up-regulate CCNB2 gene in mouse and human pituitary adenomas. Cancer Res 2009; 69:1844-50. [PMID: 19223528 DOI: 10.1158/0008-5472.can-08-4133] [Citation(s) in RCA: 92] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The high mobility group As (HMGAs) belong to a family of nonhistone nuclear proteins that orchestrate the assembly of nucleoprotein complexes. Through a complex network of protein-DNA and protein-protein interaction, they play important roles in gene transcription, recombination, and chromatin structure. This protein family is involved, through different mechanisms, in both benign and malignant neoplasias. We have recently reported that transgenic mice carrying the Hmga1 or Hmga2 genes under transcriptional control of the cytomegalovirus promoter develop pituitary adenomas secreting prolactin and growth hormone. We have shown that the mechanism of the HMGA2-induced pituitary adenoma is based on the increased E2F1 activity. The expression profile of mouse normal pituitary glands and adenomas induced in HMGA transgenic mice revealed an increased expression of the ccnb2 gene, coding for the cyclin B2 protein, in the neoplastic tissues compared with the normal pituitary gland. Here, we show, by electrophoretic mobility shift assay and chromatin immunoprecipitation, a direct binding of HMGA proteins to the promoter of ccnb2 gene, whereas luciferase assays showed that HMGAs are able to up-regulate ccnb2 promoter activity. Finally, we report an increased CCNB2 expression in human pituitary adenomas of different histotypes that is directly correlated with HMGA1 and HMGA2 expression. Because cyclin B2 is involved in the regulation of the cell cycle, these results taken together indicate that HMGA-induced cyclin B2 overexpression gives an important contribution to experimental and human pituitary tumorigenesis.
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Affiliation(s)
- Ivana De Martino
- Istituto di Endocrinologia ed Oncologia Sperimentale del Consiglio Nazionale delle Ricerche c/o Dipartimento di Biologia e Patologia Cellulare e Molecolare, Facoltà di Medicina e Chirurgia di Napoli, Italy
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38
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Sahoo D, Dill DL, Gentles AJ, Tibshirani R, Plevritis SK. Boolean implication networks derived from large scale, whole genome microarray datasets. Genome Biol 2008; 9:R157. [PMID: 18973690 PMCID: PMC2760884 DOI: 10.1186/gb-2008-9-10-r157] [Citation(s) in RCA: 80] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2008] [Revised: 09/06/2008] [Accepted: 10/30/2008] [Indexed: 11/23/2022] Open
Abstract
A method for analysis of microarray data is presented that extracts statistically significant Boolean implication relationships between pairs of genes. We describe a method for extracting Boolean implications (if-then relationships) in very large amounts of gene expression microarray data. A meta-analysis of data from thousands of microarrays for humans, mice, and fruit flies finds millions of implication relationships between genes that would be missed by other methods. These relationships capture gender differences, tissue differences, development, and differentiation. New relationships are discovered that are preserved across all three species.
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Affiliation(s)
- Debashis Sahoo
- Department of Computer Science, Stanford University, Stanford, CA 94305, USA
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39
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Manni I, Caretti G, Artuso S, Gurtner A, Emiliozzi V, Sacchi A, Mantovani R, Piaggio G. Posttranslational regulation of NF-YA modulates NF-Y transcriptional activity. Mol Biol Cell 2008; 19:5203-13. [PMID: 18815279 DOI: 10.1091/mbc.e08-03-0295] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
NF-Y binds to CCAAT motifs in the promoter region of a variety of genes involved in cell cycle progression. The NF-Y complex comprises three subunits, NF-YA, -YB, and -YC, all required for DNA binding. Expression of NF-YA fluctuates during the cell cycle and is down-regulated in postmitotic cells, indicating its role as the regulatory subunit of the complex. Control of NF-YA accumulation is posttranscriptional, NF-YA mRNA being relatively constant. Here we show that the levels of NF-YA protein are regulated posttranslationally by ubiquitylation and acetylation. A NF-YA protein carrying four mutated lysines in the C-terminal domain is more stable than the wild-type form, indicating that these lysines are ubiquitylated Two of the lysines are acetylated in vitro by p300, suggesting a competition between ubiquitylation and acetylation of overlapping residues. Interestingly, overexpression of a degradation-resistant NF-YA protein leads to sustained expression of mitotic cyclin complexes and increased cell proliferation, indicating that a tight regulation of NF-YA levels contributes to regulate NF-Y activity.
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Affiliation(s)
- Isabella Manni
- Molecular Oncogenesis Laboratory, Regina Elena Cancer Institute, 00158 Rome, Italy
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40
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Abstract
Targeted proteasomal degradation mediated by E3 ubiquitin ligases controls cell cycle progression, and alterations in their activities likely contribute to malignant cell proliferation. S phase kinase-associated protein 2 (Skp2) is the F-box component of an E3 ubiquitin ligase complex that targets p27(Kip1) and cyclin E1 to the proteasome. In human melanoma, Skp2 is highly expressed, regulated by mutant B-RAF, and required for cell growth. We show that Skp2 depletion in melanoma cells resulted in a tetraploid cell cycle arrest. Surprisingly, co-knockdown of p27(Kip1) or cyclin E1 failed to prevent the tetraploid arrest induced by Skp2 knockdown. Enhanced Aurora A phosphorylation and repression of G2/M regulators cyclin B1, cyclin-dependent kinase 1, and cyclin A indicated a G2/early M phase arrest in Skp2-depleted cells. Furthermore, expression of nuclear localized cyclin B1 prevented tetraploid accumulation after Skp2 knockdown. The p53 status is most frequently wild type in melanoma, and the tetraploid arrest and down-regulation of G2/M regulatory genes were strongly dependent on wild-type p53 expression. In mutant p53 melanoma lines, Skp2 depletion did not induce cell cycle arrest despite up-regulation of p27(Kip1). These data indicate that elevated Skp2 expression may overcome p53-dependent cell cycle checkpoints in melanoma cells and highlight Skp2 actions that are independent of p27(Kip1) degradation.
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Affiliation(s)
- Rong Hu
- Center for Cell Biology and Cancer Research, Albany Medical College, Albany, NY 12208, USA
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41
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Wu CH, Sahoo D, Arvanitis C, Bradon N, Dill DL, Felsher DW. Combined analysis of murine and human microarrays and ChIP analysis reveals genes associated with the ability of MYC to maintain tumorigenesis. PLoS Genet 2008; 4:e1000090. [PMID: 18535662 PMCID: PMC2390767 DOI: 10.1371/journal.pgen.1000090] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2007] [Accepted: 05/08/2008] [Indexed: 01/15/2023] Open
Abstract
The MYC oncogene has been implicated in the regulation of up to thousands of genes involved in many cellular programs including proliferation, growth, differentiation, self-renewal, and apoptosis. MYC is thought to induce cancer through an exaggerated effect on these physiologic programs. Which of these genes are responsible for the ability of MYC to initiate and/or maintain tumorigenesis is not clear. Previously, we have shown that upon brief MYC inactivation, some tumors undergo sustained regression. Here we demonstrate that upon MYC inactivation there are global permanent changes in gene expression detected by microarray analysis. By applying StepMiner analysis, we identified genes whose expression most strongly correlated with the ability of MYC to induce a neoplastic state. Notably, genes were identified that exhibited permanent changes in mRNA expression upon MYC inactivation. Importantly, permanent changes in gene expression could be shown by chromatin immunoprecipitation (ChIP) to be associated with permanent changes in the ability of MYC to bind to the promoter regions. Our list of candidate genes associated with tumor maintenance was further refined by comparing our analysis with other published results to generate a gene signature associated with MYC-induced tumorigenesis in mice. To validate the role of gene signatures associated with MYC in human tumorigenesis, we examined the expression of human homologs in 273 published human lymphoma microarray datasets in Affymetrix U133A format. One large functional group of these genes included the ribosomal structural proteins. In addition, we identified a group of genes involved in a diverse array of cellular functions including: BZW2, H2AFY, SFRS3, NAP1L1, NOLA2, UBE2D2, CCNG1, LIFR, FABP3, and EDG1. Hence, through our analysis of gene expression in murine tumor models and human lymphomas, we have identified a novel gene signature correlated with the ability of MYC to maintain tumorigenesis. The targeted inactivation of oncogenes may be a specific and effective treatment of cancer. However, how oncogene inactivation leads to tumor regression is not clear. Previously, we have shown that even the brief inactivation of the MYC oncogene can result in the sustained regression of at least some tumors. To understand the mechanism, we have utilized several novel genomic analyses to define a set of genes that strongly correlate with the ability of the MYC oncogene to maintain tumorigenesis. First, we generated a novel data set from microarray analyses of murine tumors that we analyzed by StepMiner to identify discrete step changes in gene expression after the inactivation or the reactivation of the MYC oncogene. Second, we utilized Boolean Network Analysis to further define the subset of genes highly correlated with MYC in human tumorigenesis. Third, we utilized ChIP analysis to demonstrate that in many cases the permanent changes of gene expression we uncovered were associated with changes in the ability of MYC to occupy the promoter locus. Our general strategy could be similarly utilized in other experimental model systems to understand how specific oncogenes contribute to the maintenance of tumorigenesis.
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Affiliation(s)
- Chi-Hwa Wu
- Departments of Medicine and Pathology, Division of Oncology, Stanford University School of Medicine, Stanford, California, United States of America
| | - Debashis Sahoo
- Department of Electrical Engineering, Stanford University, Stanford, California, United States of America
| | - Constadina Arvanitis
- Departments of Medicine and Pathology, Division of Oncology, Stanford University School of Medicine, Stanford, California, United States of America
| | - Nicole Bradon
- Departments of Medicine and Pathology, Division of Oncology, Stanford University School of Medicine, Stanford, California, United States of America
| | - David L. Dill
- Department of Computer Science, Stanford University, Stanford, California, United States of America
| | - Dean W. Felsher
- Departments of Medicine and Pathology, Division of Oncology, Stanford University School of Medicine, Stanford, California, United States of America
- * E-mail:
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Gurtner A, Fuschi P, Magi F, Colussi C, Gaetano C, Dobbelstein M, Sacchi A, Piaggio G. NF-Y dependent epigenetic modifications discriminate between proliferating and postmitotic tissue. PLoS One 2008; 3:e2047. [PMID: 18431504 PMCID: PMC2295263 DOI: 10.1371/journal.pone.0002047] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2007] [Accepted: 03/13/2008] [Indexed: 02/03/2023] Open
Abstract
The regulation of gene transcription requires posttranslational modifications of histones that, in concert with chromatin remodeling factors, shape the structure of chromatin. It is currently under intense investigation how this structure is modulated, in particular in the context of proliferation and differentiation. Compelling evidence suggests that the transcription factor NF-Y acts as a master regulator of cell cycle progression, activating the transcription of many cell cycle regulatory genes. However, the underlying molecular mechanisms are not yet completely understood. Here we show that NF-Y exerts its effect on transcription through the modulation of the histone "code". NF-Y colocalizes with nascent RNA, while RNA polymerase II is I phosphorylated on serine 2 of the YSPTSPS repeats within its carboxyterminal domain and histones are carrying modifications that represent activation signals of gene expression (H3K9ac and PAN-H4ac). Comparing postmitotic muscle tissue from normal mice and proliferating muscles from mdx mice, we demonstrate by chromatin immunoprecipitation (ChIP) that NF-Y DNA binding activity correlates with the accumulation of acetylated histones H3 and H4 on promoters of key cell cycle regulatory genes, and with their active transcription. Accordingly, p300 is recruited onto the chromatin of NF-Y target genes in a NF-Y-dependent manner, as demonstrated by Re-ChIP. Conversely, the loss of NF-Y binding correlates with a decrease of acetylated histones, the recruitment of HDAC1, and a repressed heterochromatic state with enrichment of histones carrying modifications known to mediate silencing of gene expression (H3K9me3, H3K27me2 and H4K20me3). As a consequence, NF-Y target genes are downregulated in this context. In conclusion, our data indicate a role of NF-Y in modulating the structure and transcriptional competence of chromatin in vivo and support a model in which NF-Y-dependent histone "code" changes contribute to the proper discrimination between proliferating and postmitotic cells in vivo and in vitro.
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Affiliation(s)
- Aymone Gurtner
- Molecular Oncogenesis Laboratory, Experimental Oncology Department, Regina Elena Cancer Institute, Rome, Italy
| | - Paola Fuschi
- Molecular Oncogenesis Laboratory, Experimental Oncology Department, Regina Elena Cancer Institute, Rome, Italy
| | - Fiorenza Magi
- Molecular Oncogenesis Laboratory, Experimental Oncology Department, Regina Elena Cancer Institute, Rome, Italy
| | - Claudia Colussi
- Laboratory of Vascular Pathology, Istituto Dermopatico dell'Immacolata, Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS), Rome, Italy
| | - Carlo Gaetano
- Laboratory of Vascular Pathology, Istituto Dermopatico dell'Immacolata, Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS), Rome, Italy
| | - Matthias Dobbelstein
- Department of Molecular Oncology, Göttingen Center of Molecular Biosciences (GZMB), Göttingen, Germany
| | - Ada Sacchi
- Molecular Oncogenesis Laboratory, Experimental Oncology Department, Regina Elena Cancer Institute, Rome, Italy
| | - Giulia Piaggio
- Molecular Oncogenesis Laboratory, Experimental Oncology Department, Regina Elena Cancer Institute, Rome, Italy
- Rome Oncogenomic Center, Experimental Oncology Department, Regina Elena Cancer Institute, Rome, Italy
- * E-mail:
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Jun DY, Park HS, Lee JY, Baek JY, Park HK, Fukui K, Kim YH. Positive regulation of promoter activity of human 3-phosphoglycerate dehydrogenase (PHGDH) gene is mediated by transcription factors Sp1 and NF-Y. Gene 2008; 414:106-14. [PMID: 18378410 DOI: 10.1016/j.gene.2008.02.018] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2007] [Revised: 02/12/2008] [Accepted: 02/16/2008] [Indexed: 11/28/2022]
Abstract
The PHGDH gene encodes the 3-phosphoglycerate dehydrogenase that catalyzes the transition of 3-phosphoglycerate into 3-phosphohydroxy pyruvate for the phosphorylated pathway of serine biosynthesis. To understand transcriptional regulation of the human PHGDH promoter, a genomic clone containing the 5'-flanking region of the PHGDH gene was isolated from a human genomic library. The 1192-bp PHGDH promoter region was cloned by PCR using the genomic DNA isolated from the PHGDH genomic clone. Sequence analysis of the promoter region exhibited several putative transcription factor binding sites for NF-Y, Sp1, GATA-1, p53, AP2, and AP1, with no TATA-box motif at an appropriate position. Transfection of a series of deletion constructs of the promoter region into HeLa cells revealed that the core positive promoter activity resided in the -276 to +1, which contains two GC-motifs for binding Sp1 and one CCAAT-motif for NF-Y. Mutational analysis and electrophoretic mobility shift assay indicated that both the proximal GC-motif and CCAAT-motif were crucial for full induction of the promoter activity. Chromatin immunoprecipitation analysis confirmed the recruitment of Sp1 and NF-Y to the promoter region in vivo. These results demonstrated that the promoter activity of the human PHGDH gene was positively regulated by the action of transcription factors Sp1 and NF-Y.
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Affiliation(s)
- Do Youn Jun
- Laboratory of Immunobiology, School of Life Sciences and Biotechnology, College of Natural Sciences, Kyungpook National University, Daegu, Republic of Korea
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Elemento O, Slonim N, Tavazoie S. A universal framework for regulatory element discovery across all genomes and data types. Mol Cell 2008; 28:337-50. [PMID: 17964271 DOI: 10.1016/j.molcel.2007.09.027] [Citation(s) in RCA: 254] [Impact Index Per Article: 15.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2007] [Revised: 06/28/2007] [Accepted: 09/24/2007] [Indexed: 11/29/2022]
Abstract
Deciphering the noncoding regulatory genome has proved a formidable challenge. Despite the wealth of available gene expression data, there currently exists no broadly applicable method for characterizing the regulatory elements that shape the rich underlying dynamics. We present a general framework for detecting such regulatory DNA and RNA motifs that relies on directly assessing the mutual information between sequence and gene expression measurements. Our approach makes minimal assumptions about the background sequence model and the mechanisms by which elements affect gene expression. This provides a versatile motif discovery framework, across all data types and genomes, with exceptional sensitivity and near-zero false-positive rates. Applications from yeast to human uncover putative and established transcription-factor binding and miRNA target sites, revealing rich diversity in their spatial configurations, pervasive co-occurrences of DNA and RNA motifs, context-dependent selection for motif avoidance, and the strong impact of posttranscriptional processes on eukaryotic transcriptomes.
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Affiliation(s)
- Olivier Elemento
- Lewis-Sigler Institute for Integrative Genomics, Department of Molecular Biology, Princeton University, Princeton, NJ 08544, USA
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45
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Benatti P, Basile V, Merico D, Fantoni LI, Tagliafico E, Imbriano C. A balance between NF-Y and p53 governs the pro- and anti-apoptotic transcriptional response. Nucleic Acids Res 2008; 36:1415-28. [PMID: 18187512 PMCID: PMC2275158 DOI: 10.1093/nar/gkm1046] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
The transcription factor NF-Y is a trimer with histone-like subunits that binds and activates CCAAT-containing promoters. NF-Y controls the expression of several key regulators of the cell cycle. In this study, we examined the functional and molecular effects of NF-YB knockdown. Cell cycle progression is affected with a G2/M-specific depletion. This is due to the inability of activation of G2/M-specific genes, as evidenced by expression profiling, RT-PCR and ChIP data. Surprisingly, apoptosis is also observed, with Caspase 3/7/8 cleavage. A role of p53 and Bcl-2 family members is important. NF-YB inactivation is sufficient to functionally activate p53, in the absence of DNA damage. Failure to maintain a physiologic level of CCAAT-dependent transcription of anti-apoptotic genes contributes to impairment of Bax/Bcl-2 and Bax/Bcl-XL ratios. Our data highlight the importance of fine balancing the NF-Y-p53 duo for cell survival by (i) maintaining transcription of anti-apoptotic genes and (ii) preventing p53 activation that triggers the apoptotic cascade.
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Affiliation(s)
- Paolo Benatti
- Dipartimento di Biologia Animale, Università di Modena e Reggio, Via Campi 213/d, 41100 Modena, Italy
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46
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p53-Mediated downregulation of H ferritin promoter transcriptional efficiency via NF-Y. Int J Biochem Cell Biol 2008; 40:2110-9. [DOI: 10.1016/j.biocel.2008.02.010] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2007] [Revised: 02/07/2008] [Accepted: 02/11/2008] [Indexed: 11/20/2022]
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47
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Interaction of E2F-Rb family members with corepressors binding to the adjacent E2F site. Biochem Biophys Res Commun 2007; 364:1050-5. [PMID: 17976373 DOI: 10.1016/j.bbrc.2007.10.130] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2007] [Accepted: 10/24/2007] [Indexed: 11/20/2022]
Abstract
Cell cycle-dependent transcriptional repression of the E2F1 and B-myb promoters is mediated through E2F-binding sites and adjacent corepressor site (cell cycle gene homology region (CHR)/downstream repression site (DRS)). Here, we show that a factor binding to the B-myb CHR is co-purified with E2F DNA-binding activity, and coimmunoprecipitated with components of E2F/Rb-family repressor complexes, E2F4 and retinoblastoma (Rb) family proteins. In spite of structural and functional similarities, however, the E2F1 and B-myb CHRs exhibited distinct factor-binding specificities. Furthermore, substitution of E2F1 CHR with the B-myb CHR in the E2F1 promoter revealed that the B-myb CHR was unable to repress the E2F1 promoter completely in the G0 phase. These results suggest that transcriptional repression of the E2F1 and B-myb promoters is mediated by physical interaction of E2F/Rb-family repressor complexes with promoter-specific corepressors.
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48
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Tschöp K, Engeland K. Cell cycle-dependent transcription of cyclin B2 is influenced by DNA methylation but is independent of methylation in the CDE and CHR elements. FEBS J 2007; 274:5235-49. [PMID: 17868378 DOI: 10.1111/j.1742-4658.2007.06045.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
DNA methylation is an important mechanism involved in embryogenesis and tumor development. Changing cytosines to 5-methylcytosines in CpG dinucleotides has been found to be responsible for the inactivation of tumor suppressor genes by repressing transcription. A central cell cycle regulator whose synthesis is controlled by transcription is cyclin B. In mammalian cells, cyclin B1 and B2 proteins are well characterized and often found to be overexpressed in cancer patients. Transcription from cyclin B1 and B2 promoters during the cell cycle is dependent upon a combination of two sites named 'cell cycle-dependent element' (CDE) and 'cell cycle genes homology region' (CHR), through repression in G(0) and G(1) followed by release in G(2)/M. Here we show that the cyclin B2 promoter contains a CpG island and that 5-aza-deoxycytidine treatment leads to deregulation of cell cycle-dependent mRNA expression from this gene via a loss of repression in G(0). Furthermore, deletion of the DNA methyltransferase genes DNMT1 and DNMT3b leads to an increase in transcription of cyclin B2. Additionally, DNA methylation in vitro prevents transcriptional activation of the cyclin B2 promoter in G(2)/M. Analysis in vivo of the cyclin B2 core promoter revealed that the CDE/CHR site is partially methylated. However, quantitative in vivo analysis of the CpG-methylation level of the CDE during cell division indicates that CpG methylation is independent of the cell cycle. We conclude that DNA methylation affects cell cycle-dependent transcription of cyclin B2 but that regulation through CDE/CHR is independent of cytosine methylation.
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Affiliation(s)
- Katrin Tschöp
- Interdisziplinäres Zentrum für Klinische Forschung, Medizinische Fakultät, Universität Leipzig, Germany
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Krstic A, Mojsin M, Stevanovic M. Regulation of SOX3 gene expression is driven by multiple NF-Y binding elements. Arch Biochem Biophys 2007; 467:163-73. [PMID: 17910945 DOI: 10.1016/j.abb.2007.08.029] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2007] [Revised: 08/22/2007] [Accepted: 08/23/2007] [Indexed: 01/29/2023]
Abstract
The presented results demonstrate that human SOX3 promoter possesses three CCAAT box control elements involved in the regulation of SOX3 gene expression in NT2/D1 cells. By mutational analysis we have shown that all three elements are of functional relevance for constitutive SOX3 expression. Electrophoretic mobility shift assays indicate that the active complexes at three sites involve the ubiquitously expressed CCAAT binding protein NF-Y. The involvement of NF-Y in the up-regulation of SOX3 expression in NT2/D1 cells was demonstrated in vivo by Northern and Western blot analyses. Furthermore, in co-transfection experiments we have shown that NF-Y mediates transcriptional activation of SOX3 promoter. Our data indicate that multiple CCAAT control elements are involved in the regulation of the SOX3 promoter, suggesting that NF-Y functions as a key regulator of SOX3 gene expression. Further, our results indicate that these elements can be recognized as modulators of retinoic acid induced activation of SOX3 expression.
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Affiliation(s)
- Aleksandar Krstic
- Institute of Molecular Genetics and Genetic Engineering, Vojvode Stepe 444a, P.O. Box 23, 11010 Belgrade, Serbia
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50
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Park SH, Yu GR, Kim WH, Moon WS, Kim JH, Kim DG. NF-Y-dependent cyclin B2 expression in colorectal adenocarcinoma. Clin Cancer Res 2007; 13:858-67. [PMID: 17289878 DOI: 10.1158/1078-0432.ccr-06-1461] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
PURPOSE Cyclin B2, a G(2)-M cyclin, is overexpressed in colorectal adenocarcinomas compared with the normal mucosa. This study examined the level of cyclin B2 overexpression according to the histologic findings and investigated the mechanism(s) and clinical implications of cyclin B2 overexpression in colorectal adenocarcinomas. EXPERIMENTAL DESIGN The immunoreactivity of the polyclonal antibodies to cyclin B2 was determined in colorectal cancer cells. The transcriptional regulation of cyclin B2 by NF-Y was analyzed using an in vitro transfection assay and an in vivo chromatin immunoprecipitation assay. The proliferative activity of the colorectal cancer cells in relation to cyclin B2 overexpression was further examined. RESULTS The cytoplasmic distribution of cyclin B2 immunoreactivity was positive in 42 of 65 (64.6%) cases of colorectal adenocarcinoma, and the level was similar regardless of the histologic type. A dominant-negative form of NF-YA effectively inhibited the cyclin B2 promoter activity, and NF-Y was found to bind three conserved CCAAT boxes in the cyclin B2 promoter in colorectal adenocarcinoma cells. Tumor cells with a higher functional cyclin B2 activity grew faster than those with a lower activity. Furthermore, there was a correlation between the cells showing immunoreactivity to cyclin B2 and those containing the proliferating cell nuclear antigen, a G1-S cyclin, which is also downstream of NF-Y in colorectal adenocarcinoma cells. CONCLUSIONS Cyclin B2 seems to be a molecular marker of a colorectal adenocarcinoma and that its up-regulation and coordinate expression of the other cell cycle-related genes by NF-Y might contribute to tumor cell proliferation by accelerating cell cycle progression.
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Affiliation(s)
- Seon-Hwa Park
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, The Research Institute of Clinical Medicine, Brain Korea 21 Program for Medical Science, Chonbuk National University Medical School and Hospital, Jeonju, Jeonbuk, South Korea
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