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Kealy L, Runting J, Thiele D, Scheer S. An emerging maestro of immune regulation: how DOT1L orchestrates the harmonies of the immune system. Front Immunol 2024; 15:1385319. [PMID: 38962004 PMCID: PMC11219580 DOI: 10.3389/fimmu.2024.1385319] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2024] [Accepted: 04/04/2024] [Indexed: 07/05/2024] Open
Abstract
The immune system comprises a complex yet tightly regulated network of cells and molecules that play a critical role in protecting the body from infection and disease. The activity and development of each immune cell is regulated in a myriad of ways including through the cytokine milieu, the availability of key receptors, via tailored intracellular signalling cascades, dedicated transcription factors and even by directly modulating gene accessibility and expression; the latter is more commonly known as epigenetic regulation. In recent years, epigenetic regulators have begun to emerge as key players involved in modulating the immune system. Among these, the lysine methyltransferase DOT1L has gained significant attention for its involvement in orchestrating immune cell formation and function. In this review we provide an overview of the role of DOT1L across the immune system and the implications of this role on health and disease. We begin by elucidating the general mechanisms of DOT1L-mediated histone methylation and its impact on gene expression within immune cells. Subsequently, we provide a detailed and comprehensive overview of recent studies that identify DOT1L as a crucial regulator of immune cell development, differentiation, and activation. Next, we discuss the potential mechanisms of DOT1L-mediated regulation of immune cell function and shed light on how DOT1L might be contributing to immune cell homeostasis and dysfunction. We then provide food for thought by highlighting some of the current obstacles and technical limitations precluding a more in-depth elucidation of DOT1L's role. Finally, we explore the potential therapeutic implications of targeting DOT1L in the context of immune-related diseases and discuss ongoing research efforts to this end. Overall, this review consolidates the current paradigm regarding DOT1L's role across the immune network and emphasises its critical role in governing the healthy immune system and its potential as a novel therapeutic target for immune-related diseases. A deeper understanding of DOT1L's immunomodulatory functions could pave the way for innovative therapeutic approaches which fine-tune the immune response to enhance or restore human health.
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Affiliation(s)
- Liam Kealy
- Immunity Program, The Biomedicine Discovery Institute, Monash University, Clayton, VIC, Australia
| | - Jessica Runting
- Immunity Program, The Biomedicine Discovery Institute, Monash University, Clayton, VIC, Australia
| | - Daniel Thiele
- Immunity Program, The Biomedicine Discovery Institute, Monash University, Clayton, VIC, Australia
| | - Sebastian Scheer
- Immunity Program, The Biomedicine Discovery Institute, Monash University, Clayton, VIC, Australia
- Department of Infection and Immunity, Luxembourg Institute of Health, Esch-sur-Alzette, Luxembourg
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2
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Ajore R, Niroula A, Pertesi M, Cafaro C, Thodberg M, Went M, Bao EL, Duran-Lozano L, Lopez de Lapuente Portilla A, Olafsdottir T, Ugidos-Damboriena N, Magnusson O, Samur M, Lareau CA, Halldorsson GH, Thorleifsson G, Norddahl GL, Gunnarsdottir K, Försti A, Goldschmidt H, Hemminki K, van Rhee F, Kimber S, Sperling AS, Kaiser M, Anderson K, Jonsdottir I, Munshi N, Rafnar T, Waage A, Weinhold N, Thorsteinsdottir U, Sankaran VG, Stefansson K, Houlston R, Nilsson B. Functional dissection of inherited non-coding variation influencing multiple myeloma risk. Nat Commun 2022; 13:151. [PMID: 35013207 PMCID: PMC8748989 DOI: 10.1038/s41467-021-27666-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2020] [Accepted: 12/02/2021] [Indexed: 12/16/2022] Open
Abstract
Thousands of non-coding variants have been associated with increased risk of human diseases, yet the causal variants and their mechanisms-of-action remain obscure. In an integrative study combining massively parallel reporter assays (MPRA), expression analyses (eQTL, meQTL, PCHiC) and chromatin accessibility analyses in primary cells (caQTL), we investigate 1,039 variants associated with multiple myeloma (MM). We demonstrate that MM susceptibility is mediated by gene-regulatory changes in plasma cells and B-cells, and identify putative causal variants at six risk loci (SMARCD3, WAC, ELL2, CDCA7L, CEP120, and PREX1). Notably, three of these variants co-localize with significant plasma cell caQTLs, signaling the presence of causal activity at these precise genomic positions in an endogenous chromosomal context in vivo. Our results provide a systematic functional dissection of risk loci for a hematologic malignancy.
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Affiliation(s)
- Ram Ajore
- Hematology and Transfusion Medicine, Department of Laboratory Medicine, BMC B13, 221 84, Lund, Sweden
| | - Abhishek Niroula
- Hematology and Transfusion Medicine, Department of Laboratory Medicine, BMC B13, 221 84, Lund, Sweden
- Broad Institute of Massachusetts Institute of Technology and Harvard University, 415 Main Street, Boston, MA, 02142, USA
| | - Maroulio Pertesi
- Hematology and Transfusion Medicine, Department of Laboratory Medicine, BMC B13, 221 84, Lund, Sweden
| | - Caterina Cafaro
- Hematology and Transfusion Medicine, Department of Laboratory Medicine, BMC B13, 221 84, Lund, Sweden
| | - Malte Thodberg
- Hematology and Transfusion Medicine, Department of Laboratory Medicine, BMC B13, 221 84, Lund, Sweden
| | - Molly Went
- Division of Genetics and Epidemiology, The Institute of Cancer Research, 123 Old Brompton Road, London, SW7 3RP, United Kingdom
| | - Erik L Bao
- Broad Institute of Massachusetts Institute of Technology and Harvard University, 415 Main Street, Boston, MA, 02142, USA
- Division of Hematology/Oncology, Boston Children's Hospital, Harvard Medical School, Boston, MA, USA
- Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA, USA
| | - Laura Duran-Lozano
- Hematology and Transfusion Medicine, Department of Laboratory Medicine, BMC B13, 221 84, Lund, Sweden
| | | | | | - Nerea Ugidos-Damboriena
- Hematology and Transfusion Medicine, Department of Laboratory Medicine, BMC B13, 221 84, Lund, Sweden
| | - Olafur Magnusson
- deCODE Genetics/Amgen Inc., Sturlugata 8, 101, Reykjavik, Iceland
| | - Mehmet Samur
- Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA, USA
| | - Caleb A Lareau
- Broad Institute of Massachusetts Institute of Technology and Harvard University, 415 Main Street, Boston, MA, 02142, USA
- Division of Hematology/Oncology, Boston Children's Hospital, Harvard Medical School, Boston, MA, USA
- Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA, USA
| | | | | | | | | | - Asta Försti
- German Cancer Research Center (DKFZ), Im Neuenheimer Feld 580, D-69120, Heidelberg, Germany
- Hopp Children's Cancer Center, Heidelberg, Germany
| | - Hartmut Goldschmidt
- Department of Internal Medicine V, University Hospital of Heidelberg, 69120, Heidelberg, Germany
| | - Kari Hemminki
- German Cancer Research Center (DKFZ), Im Neuenheimer Feld 580, D-69120, Heidelberg, Germany
- Faculty of Medicine and Biomedical Center in Pilsen, Charles University in Prague, Prague, 30605, Czech Republic
| | | | - Scott Kimber
- Division of Genetics and Epidemiology, The Institute of Cancer Research, 123 Old Brompton Road, London, SW7 3RP, United Kingdom
| | - Adam S Sperling
- Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA, USA
| | - Martin Kaiser
- Division of Genetics and Epidemiology, The Institute of Cancer Research, 123 Old Brompton Road, London, SW7 3RP, United Kingdom
| | - Kenneth Anderson
- Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA, USA
| | | | - Nikhil Munshi
- Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA, USA
| | - Thorunn Rafnar
- deCODE Genetics/Amgen Inc., Sturlugata 8, 101, Reykjavik, Iceland
| | - Anders Waage
- Department of Cancer Research and Molecular Medicine, Norwegian University of Science and Technology, Box 8905, N-7491, Trondheim, Norway
| | - Niels Weinhold
- German Cancer Research Center (DKFZ), Im Neuenheimer Feld 580, D-69120, Heidelberg, Germany
- Department of Internal Medicine V, University Hospital of Heidelberg, 69120, Heidelberg, Germany
| | | | - Vijay G Sankaran
- Broad Institute of Massachusetts Institute of Technology and Harvard University, 415 Main Street, Boston, MA, 02142, USA
- Division of Hematology/Oncology, Boston Children's Hospital, Harvard Medical School, Boston, MA, USA
- Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA, USA
- Harvard Stem Cell Institute, Cambridge, MA, USA
| | - Kari Stefansson
- deCODE Genetics/Amgen Inc., Sturlugata 8, 101, Reykjavik, Iceland
| | - Richard Houlston
- Division of Genetics and Epidemiology, The Institute of Cancer Research, 123 Old Brompton Road, London, SW7 3RP, United Kingdom
| | - Björn Nilsson
- Hematology and Transfusion Medicine, Department of Laboratory Medicine, BMC B13, 221 84, Lund, Sweden.
- Broad Institute of Massachusetts Institute of Technology and Harvard University, 415 Main Street, Boston, MA, 02142, USA.
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3
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Kealy L, Di Pietro A, Hailes L, Scheer S, Dalit L, Groom JR, Zaph C, Good-Jacobson KL. The Histone Methyltransferase DOT1L Is Essential for Humoral Immune Responses. Cell Rep 2020; 33:108504. [PMID: 33326791 DOI: 10.1016/j.celrep.2020.108504] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2020] [Revised: 10/02/2020] [Accepted: 11/17/2020] [Indexed: 12/11/2022] Open
Abstract
Histone modifiers are essential for the ability of immune cells to reprogram their gene expression during differentiation. The recruitment of the histone methyltransferase DOT1L (disruptor of telomeric silencing 1-like) induces oncogenic gene expression in a subset of B cell leukemias. Despite its importance, its role in the humoral immune system is unclear. Here, we demonstrate that DOT1L is a critical regulator of B cell biology. B cell development is defective in Dot1lf/fMb1Cre/+ mice, culminating in a reduction of peripheral mature B cells. Upon immunization or influenza infection of Dot1lf/fCd23Cre/+ mice, class-switched antibody-secreting cells are significantly attenuated and germinal centers fail to form. Consequently, DOT1L is essential for B cell memory formation. Transcriptome, pathway, and histological analyses identified a role for DOT1L in reprogramming gene expression for appropriate localization of B cells during the initial stage of the response. Together, these results demonstrate an essential role for DOT1L in generating an effective humoral immune response.
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Affiliation(s)
- Liam Kealy
- Department of Biochemistry and Molecular Biology, Monash University, Clayton, VIC 3800, Australia; Infection and Immunity Program, Biomedicine Discovery Institute, Monash University, Clayton, VIC 3800, Australia
| | - Andrea Di Pietro
- Department of Biochemistry and Molecular Biology, Monash University, Clayton, VIC 3800, Australia; Infection and Immunity Program, Biomedicine Discovery Institute, Monash University, Clayton, VIC 3800, Australia
| | - Lauren Hailes
- Department of Biochemistry and Molecular Biology, Monash University, Clayton, VIC 3800, Australia; Infection and Immunity Program, Biomedicine Discovery Institute, Monash University, Clayton, VIC 3800, Australia
| | - Sebastian Scheer
- Department of Biochemistry and Molecular Biology, Monash University, Clayton, VIC 3800, Australia; Infection and Immunity Program, Biomedicine Discovery Institute, Monash University, Clayton, VIC 3800, Australia
| | - Lennard Dalit
- Division of Immunology, Walter and Eliza Hall Institute of Medical Research, Parkville, VIC 3052, Australia; Department of Medical Biology, University of Melbourne, Parkville, VIC 3010, Australia
| | - Joanna R Groom
- Division of Immunology, Walter and Eliza Hall Institute of Medical Research, Parkville, VIC 3052, Australia; Department of Medical Biology, University of Melbourne, Parkville, VIC 3010, Australia
| | - Colby Zaph
- Department of Biochemistry and Molecular Biology, Monash University, Clayton, VIC 3800, Australia; Infection and Immunity Program, Biomedicine Discovery Institute, Monash University, Clayton, VIC 3800, Australia
| | - Kim L Good-Jacobson
- Department of Biochemistry and Molecular Biology, Monash University, Clayton, VIC 3800, Australia; Infection and Immunity Program, Biomedicine Discovery Institute, Monash University, Clayton, VIC 3800, Australia.
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4
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Wang Z, Pascal LE, Chandran UR, Chaparala S, Lv S, Ding H, Qi L, Wang Z. ELL2 Is Required for the Growth and Survival of AR-Negative Prostate Cancer Cells. Cancer Manag Res 2020; 12:4411-4427. [PMID: 32606936 PMCID: PMC7294050 DOI: 10.2147/cmar.s248854] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2020] [Accepted: 05/01/2020] [Indexed: 12/20/2022] Open
Abstract
Background Elongation factor for RNA polymerase II 2 (ELL2) was reported as a putative tumor suppressor in the prostate. ELL2 is frequently down-regulated in prostatic adenocarcinoma specimens, and loss of ELL2 induced murine prostatic intraepithelial neoplasia and enhanced AR-positive prostate cancer cell proliferation. However, the ELL2 gene appears to be amplified in AR-negative neuroendocrine prostate tumors, suggesting a potential oncogenic role for ELL2 in AR-negative prostate cancer cells. In this study, we explored the potential function of ELL2 in PC-3 and DU145, two AR-negative prostate cancer cell lines. Materials and Methods The role of ELL2 in PC-3 and DU145 cells was studied using siRNA-mediated ELL2 knockdown. Genes regulated by ELL2 knockdown in PC-3 cells were identified and analyzed using RNA-Seq and bioinformatics. The expression of representative genes was confirmed by Western blot and/or quantitative PCR. Cell growth was determined by BrdU, MTT and colony formation assays. Cell death was analyzed by 7-AAD/Annexin V staining and trypan blue exclusion staining. Cell cycle was determined by PI staining and flow cytometry. Results ELL2 knockdown inhibited the proliferation of PC-3 and DU145 cells. RNA-Seq analysis showed an enrichment in genes associated with cell death and survival following ELL2 knockdown. The interferon-γ pathway was identified as the top canonical pathway comprising of 55.6% of the genes regulated by ELL2. ELL2 knockdown induced an increase in STAT1 and IRF1 mRNA and an induction of total STAT1 and phosphorylated STAT1 protein. Inhibition of cell proliferation by ELL2 knockdown was partly abrogated by STAT1 knockdown. ELL2 knockdown inhibited colony formation and induced apoptosis in both PC-3 and DU145 cells. Furthermore, knockdown of ELL2 caused S-phase cell cycle arrest, inhibition of CDK2 phosphorylation and cyclin D1 expression, and increased expression of cyclin E. Conclusion ELL2 knockdown in PC-3 and DU145 cells induced S-phase cell cycle arrest and profound apoptosis, which was accompanied by the induction of genes associated with cell death and survival pathways. These observations suggest that ELL2 is a potential oncogenic protein required for survival and proliferation in AR-negative prostate cancer cells.
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Affiliation(s)
- Zhi Wang
- Department of Urology, Xiangya Hospital of Central South University, Changsha, People's Republic of China.,Department of Urology, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Laura E Pascal
- Department of Urology, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Uma R Chandran
- Department of Biomedical Informatics, University of Pittsburgh, Pittsburgh, PA, USA
| | - Srilakshmi Chaparala
- Department of Biomedical Informatics, University of Pittsburgh, Pittsburgh, PA, USA
| | - Shidong Lv
- Department of Urology, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA.,Department of Urology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, People's Republic of China
| | - Hui Ding
- Department of Urology, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Lin Qi
- Department of Urology, Xiangya Hospital of Central South University, Changsha, People's Republic of China
| | - Zhou Wang
- Department of Urology, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA.,UPMC Hillman Cancer Center, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA.,Department of Pharmacology and Chemical Biology, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA.,Department of Pathology, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
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5
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Ghobrial A, Flick N, Daly R, Hoffman M, Milcarek C. ELL2 Influences Transcription Elongation, Splicing, Ig Secretion and Growth. JOURNAL OF MUCOSAL IMMUNOLOGY RESEARCH 2019; 3:112. [PMID: 31930204 PMCID: PMC6953911] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Abstract
ELL2 was previously discovered as a member of the Super Elongation Complex. It is involved in driving the maturation of B cells to plasma cells through shifting patterns of RNA processing, favoring generation of the secretory form of heavy chain immunoglobulin (IgH) associated with plasma cells. ELL2 influences the expression and splicing patterns of more than 4,000 genes in antibody secreting cells. The ELL2 gene has been implicated in cancers such as multiple myeloma and salivary gland carcinoma. A member of the ELL family (ELL1) was recently proven to act as an E3 ubiquitin ligase to known proto-oncogene, c-Myc, through a highly conserved cysteine residue in the C-terminal CEYLH region. Comparison of sequence homology shows this region is conserved between the three members of the ELL family, leading us to hypothesize that the other two ELLs (2 and 3) could serve the same role. In this review, we summarize what is known about ELL2 with respect to its role in driving B cell to plasma cell differentiation as well as its potential role in tumor suppression.
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Affiliation(s)
| | | | | | | | - Christine Milcarek
- Corresponding author: Dr. Christine Milcarek, Department of Immunology, School of Medicine, University of Pittsburgh, Pittsburgh, PA 15213, USA, Tel: 02-3937-6828;
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6
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Carew NT, Nelson AM, Liang Z, Smith SM, Milcarek C. Linking Endoplasmic Reticular Stress and Alternative Splicing. Int J Mol Sci 2018; 19:ijms19123919. [PMID: 30544499 PMCID: PMC6321306 DOI: 10.3390/ijms19123919] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2018] [Revised: 12/04/2018] [Accepted: 12/05/2018] [Indexed: 12/16/2022] Open
Abstract
RNA splicing patterns in antibody-secreting cells are shaped by endoplasmic reticulum stress, ELL2 (eleven-nineteen lysine-rich leukemia gene 2) induction, and changes in the levels of snRNAs. Endoplasmic reticulum stress induces the unfolded protein response comprising a highly conserved set of genes crucial for cell survival; among these is Ire1, whose auto-phosphorylation drives it to acquire a regulated mRNA decay activity. The mRNA-modifying function of phosphorylated Ire1 non-canonically splices Xbp1 mRNA and yet degrades other cellular mRNAs with related motifs. Naïve splenic B cells will activate Ire1 phosphorylation early on after lipopolysaccharide (LPS) stimulation, within 18 h; large-scale changes in mRNA content and splicing patterns result. Inhibition of the mRNA-degradation function of Ire1 is correlated with further differences in the splicing patterns and a reduction in the mRNA factors for snRNA transcription. Some of the >4000 splicing changes seen at 18 h after LPS stimulation persist into the late stages of antibody secretion, up to 72 h. Meanwhile some early splicing changes are supplanted by new splicing changes introduced by the up-regulation of ELL2, a transcription elongation factor. ELL2 is necessary for immunoglobulin secretion and does this by changing mRNA processing patterns of immunoglobulin heavy chain and >5000 other genes.
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Affiliation(s)
- Nolan T Carew
- School of Medicine, Department of Immunology, University of Pittsburgh, E1059 Biomedical Science Tower, Pittsburgh, PA 15261, USA.
| | - Ashley M Nelson
- School of Medicine, Department of Immunology, University of Pittsburgh, E1059 Biomedical Science Tower, Pittsburgh, PA 15261, USA.
| | - Zhitao Liang
- School of Medicine, Department of Immunology, University of Pittsburgh, E1059 Biomedical Science Tower, Pittsburgh, PA 15261, USA.
| | - Sage M Smith
- School of Medicine, Department of Immunology, University of Pittsburgh, E1059 Biomedical Science Tower, Pittsburgh, PA 15261, USA.
| | - Christine Milcarek
- School of Medicine, Department of Immunology, University of Pittsburgh, E1059 Biomedical Science Tower, Pittsburgh, PA 15261, USA.
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7
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Nelson AM, Carew NT, Smith SM, Milcarek C. RNA Splicing in the Transition from B Cells to Antibody-Secreting Cells: The Influences of ELL2, Small Nuclear RNA, and Endoplasmic Reticulum Stress. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2018; 201:3073-3083. [PMID: 30297340 PMCID: PMC6219926 DOI: 10.4049/jimmunol.1800557] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2018] [Accepted: 09/07/2018] [Indexed: 12/21/2022]
Abstract
In the transition from B cells to Ab-secreting cells (ASCs) many genes are induced, such as ELL2, Irf4, Prdm1, Xbp1, whereas other mRNAs do not change in abundance. Nonetheless, using splicing array technology and mouse splenic B cells plus or minus LPS, we found that induced and "uninduced" genes can show large differences in splicing patterns between the cell stages, which could influence ASC development. We found that ∼55% of these splicing changes depend on ELL2, a transcription elongation factor that influences expression levels and splicing patterns of ASC signature genes, genes in the cell-cycle and N-glycan biosynthesis and processing pathways, and the secretory versus membrane forms of the IgH mRNA. Some of these changes occur when ELL2 binds directly to the genes encoding those mRNAs, whereas some of the changes are indirect. To attempt to account for the changes that occur in RNA splicing before or without ELL2 induction, we examined the amount of the small nuclear RNA molecules and found that they were significantly decreased within 18 h of LPS stimulation and stayed low until 72 h. Correlating with this, at 18 h after LPS, endoplasmic reticulum stress and Ire1 phosphorylation are induced. Inhibiting the regulated Ire1-dependent mRNA decay with 4u8C correlates with the reduction in small nuclear RNA and changes in the normal splicing patterns at 18 h. Thus, we conclude that the RNA splicing patterns in ASCs are shaped early by endoplasmic reticulum stress and Ire1 phosphorylation and later by ELL2 induction.
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Affiliation(s)
- Ashley M Nelson
- Department of Immunology, University of Pittsburgh, Pittsburgh, PA 15261
| | - Nolan T Carew
- Department of Immunology, University of Pittsburgh, Pittsburgh, PA 15261
| | - Sage M Smith
- Department of Immunology, University of Pittsburgh, Pittsburgh, PA 15261
| | - Christine Milcarek
- Department of Immunology, University of Pittsburgh, Pittsburgh, PA 15261
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8
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Ali M, Ajore R, Wihlborg AK, Niroula A, Swaminathan B, Johnsson E, Stephens OW, Morgan G, Meissner T, Turesson I, Goldschmidt H, Mellqvist UH, Gullberg U, Hansson M, Hemminki K, Nahi H, Waage A, Weinhold N, Nilsson B. The multiple myeloma risk allele at 5q15 lowers ELL2 expression and increases ribosomal gene expression. Nat Commun 2018; 9:1649. [PMID: 29695719 PMCID: PMC5917026 DOI: 10.1038/s41467-018-04082-2] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2017] [Accepted: 03/26/2018] [Indexed: 02/06/2023] Open
Abstract
Recently, we identified ELL2 as a susceptibility gene for multiple myeloma (MM). To understand its mechanism of action, we performed expression quantitative trait locus analysis in CD138+ plasma cells from 1630 MM patients from four populations. We show that the MM risk allele lowers ELL2 expression in these cells (Pcombined = 2.5 × 10−27; βcombined = −0.24 SD), but not in peripheral blood or other tissues. Consistent with this, several variants representing the MM risk allele map to regulatory genomic regions, and three yield reduced transcriptional activity in plasmocytoma cell lines. One of these (rs3777189-C) co-locates with the best-supported lead variants for ELL2 expression and MM risk, and reduces binding of MAFF/G/K family transcription factors. Moreover, further analysis reveals that the MM risk allele associates with upregulation of gene sets related to ribosome biogenesis, and knockout/knockdown and rescue experiments in plasmocytoma cell lines support a cause–effect relationship. Our results provide mechanistic insight into MM predisposition. ELL2 was recently discovered as a susceptibility gene for multiple myeloma (MM). Here, they show that the MM risk allele lowers ELL2 expression in plasma cells, that it also upregulates gene sets related to ribosome biogenesis, and that one of the linked variants reduces binding of MAFF/G/K family transcription factors.
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Affiliation(s)
- Mina Ali
- Department of Laboratory Medicine, Hematology and Transfusion Medicine, SE 221 84, Lund, Sweden
| | - Ram Ajore
- Department of Laboratory Medicine, Hematology and Transfusion Medicine, SE 221 84, Lund, Sweden
| | - Anna-Karin Wihlborg
- Department of Laboratory Medicine, Hematology and Transfusion Medicine, SE 221 84, Lund, Sweden
| | - Abhishek Niroula
- Department of Laboratory Medicine, Hematology and Transfusion Medicine, SE 221 84, Lund, Sweden
| | - Bhairavi Swaminathan
- Department of Laboratory Medicine, Hematology and Transfusion Medicine, SE 221 84, Lund, Sweden
| | - Ellinor Johnsson
- Department of Laboratory Medicine, Hematology and Transfusion Medicine, SE 221 84, Lund, Sweden
| | - Owen W Stephens
- Myeloma Institute for Research and Therapy, University of Arkansas for Medical Sciences, Little Rock, AR, 72205, USA
| | - Gareth Morgan
- Myeloma Institute for Research and Therapy, University of Arkansas for Medical Sciences, Little Rock, AR, 72205, USA
| | - Tobias Meissner
- Department of Molecular and Experimental Medicine, Avera Cancer Institute, Sioux Falls, SD, 57105, USA
| | - Ingemar Turesson
- Department of Laboratory Medicine, Hematology and Transfusion Medicine, SE 221 84, Lund, Sweden
| | - Hartmut Goldschmidt
- Department of Internal Medicine V, University of Heidelberg, 69117, Heidelberg, Germany.,National Center for Tumor Diseases, Ulm, 69120, Heidelberg, Germany
| | | | - Urban Gullberg
- Department of Laboratory Medicine, Hematology and Transfusion Medicine, SE 221 84, Lund, Sweden
| | - Markus Hansson
- Department of Laboratory Medicine, Hematology and Transfusion Medicine, SE 221 84, Lund, Sweden.,Hematology Clinic, Skåne University Hospital, SE 221 85, Lund, Sweden
| | - Kari Hemminki
- German Cancer Research Center, 69120, Heidelberg, Germany.,Center for Primary Health Care Research, Lund University, SE 205 02, Malmö, Sweden
| | - Hareth Nahi
- Center for Hematology and Regenerative Medicine, Karolinska Institutet, SE 171 77, Stockholm, Sweden
| | - Anders Waage
- Department of Cancer Research and Molecular Medicine, Norwegian University of Science and Technology, 7491, Trondheim, Norway
| | - Niels Weinhold
- Myeloma Institute for Research and Therapy, University of Arkansas for Medical Sciences, Little Rock, AR, 72205, USA
| | - Björn Nilsson
- Department of Laboratory Medicine, Hematology and Transfusion Medicine, SE 221 84, Lund, Sweden. .,Broad Institute, 7 Cambridge Center, Cambridge, MA, 02142, USA.
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9
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Pascal LE, Masoodi KZ, Liu J, Qiu X, Song Q, Wang Y, Zang Y, Yang T, Wang Y, Rigatti LH, Chandran U, Colli LM, Vencio RZN, Lu Y, Zhang J, Wang Z. Conditional deletion of ELL2 induces murine prostate intraepithelial neoplasia. J Endocrinol 2017; 235:123-136. [PMID: 28870994 PMCID: PMC5679084 DOI: 10.1530/joe-17-0112] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/18/2017] [Accepted: 08/04/2017] [Indexed: 12/19/2022]
Abstract
Elongation factor, RNA polymerase II, 2 (ELL2) is an RNA Pol II elongation factor with functional properties similar to ELL that can interact with the prostate tumor suppressor EAF2. In the prostate, ELL2 is an androgen response gene that is upregulated in benign prostatic hyperplasia (BPH). We recently showed that ELL2 loss could enhance prostate cancer cell proliferation and migration, and that ELL2 gene expression was downregulated in high Gleason score prostate cancer specimens. Here, prostate-specific deletion of ELL2 in a mouse model revealed a potential role for ELL2 as a prostate tumor suppressor in vivoEll2-knockout mice exhibited prostatic defects including increased epithelial proliferation, vascularity and PIN lesions similar to the previously determined prostate phenotype in Eaf2-knockout mice. Microarray analysis of prostates from Ell2-knockout and wild-type mice on a C57BL/6J background at age 3 months and qPCR validation at 17 months of age revealed a number of differentially expressed genes associated with proliferation, cellular motility and epithelial and neural differentiation. OncoPrint analysis identified combined downregulation or deletion in prostate adenocarcinoma cases from the Cancer Genome Atlas (TCGA) data portal. These results suggest that ELL2 and its pathway genes likely play an important role in the development and progression of prostate cancer.
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Affiliation(s)
- Laura E Pascal
- Department of UrologyUniversity of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| | - Khalid Z Masoodi
- Department of UrologyUniversity of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
- Transcriptomics LabDivision of Plant Biotechnology, Sher-e-Kashmir University of Agricultural Sciences and Technology of Kashmir, Shalimar, Srinagar, Jammu and Kashmir, India
| | - June Liu
- Department of UrologyUniversity of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| | - Xiaonan Qiu
- Department of UrologyUniversity of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
- School of MedicineTsinghua University, Beijing, China
| | - Qiong Song
- Department of UrologyUniversity of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
- Center for Translational MedicineGuangxi Medical University, Nanning, Guangxi, China
| | - Yujuan Wang
- Department of UrologyUniversity of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| | - Yachen Zang
- Department of UrologyUniversity of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
- Department of UrologyThe Second Affiliated Hospital of Soochow University, Suzhou, China
| | - Tiejun Yang
- Department of UrologyUniversity of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
- Department of UrologyHenan Cancer Hospital, Affiliated Cancer Hospital of Zhengzhou University, Zhengzhou, China
| | - Yao Wang
- Department of UrologyUniversity of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
- Department of UrologyChina-Japan Hospital of Jilin University, Changchun, Jilin, China
| | - Lora H Rigatti
- Division of Laboratory Animal ResourcesUniversity of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| | - Uma Chandran
- Department of Biomedical InformaticsUniversity of Pittsburgh, Pittsburgh, Pennsylvania, USA
| | - Leandro M Colli
- Ribeirao Preto Medical SchoolUniversity of São Paulo, Ribeirão Preto-SP, Brazil
| | - Ricardo Z N Vencio
- Department of Computing and Mathematics FFCLRP-USPUniversity of São Paulo, Ribeirão Preto, Brazil
| | - Yi Lu
- Key Laboratory of Longevity and Aging-related DiseasesMinistry of Education, China and Center for Translational Medicine Guangxi Medical University, Nanning, Guangxi, China
- Department of BiologySouthern University of Science and Technology School of Medicine, Shenzhen, Guangdong, China
| | - Jian Zhang
- Key Laboratory of Longevity and Aging-related DiseasesMinistry of Education, China and Center for Translational Medicine Guangxi Medical University, Nanning, Guangxi, China
- Department of BiologySouthern University of Science and Technology School of Medicine, Shenzhen, Guangdong, China
| | - Zhou Wang
- Department of UrologyUniversity of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
- University of Pittsburgh Cancer InstituteUniversity of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
- Department of Pharmacology and Chemical BiologyUniversity of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
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10
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Hikosaka M, Murata A, Yoshino M, Hayashi SI. Correlation between cell aggregation and antibody production in IgE-producing plasma cells. Biochem Biophys Rep 2017; 10:224-231. [PMID: 28955750 PMCID: PMC5614669 DOI: 10.1016/j.bbrep.2017.04.007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2017] [Revised: 04/01/2017] [Accepted: 04/18/2017] [Indexed: 01/18/2023] Open
Abstract
Allergic conditions result in the increase of immunoglobulin (Ig)E-producing plasma cells (IgE-PCs); however, it is unclear how IgE production is qualitatively controlled. In this study, we found that IgE-PCs in spleen of immunized mice formed homotypic cell aggregates. By employing IgE-producing hybridomas (IgE-hybridomas) as a model of IgE-PCs, we showed that these cells formed aggregates in the presence of specific antigens (Ags). The formation of the Ag-induced cell aggregation involved secreted IgE and Fcγ receptor (FcγR)II/FcγRIII, but not FcεRs. Ag-induced cell aggregation plus lipopolysaccharide signaling resulted in an enhancement of IgE production in aggregated IgE-hybridomas. Furthermore, the administration of anti-FcγRII/FcγRIII antagonistic monoclonal antibody to immunized mice tended to reduce the splenic IgE-PC aggregation as well as the serum IgE levels. Taken together, our results suggested that Ag-IgE complexes induced IgE-PCs aggregation via FcγRII/FcγRIII, leading to the enhancement of IgE production. These findings suggest the presence of a novel mechanism for regulation of IgE production.
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Affiliation(s)
- Mari Hikosaka
- Division of Immunology, Department of Molecular and Cellular Biology, School of Life Science, Faculty of Medicine, Tottori University, 86 Nishi-Cho, Yonago, Tottori 683-8503, Japan
| | - Akihiko Murata
- Division of Immunology, Department of Molecular and Cellular Biology, School of Life Science, Faculty of Medicine, Tottori University, 86 Nishi-Cho, Yonago, Tottori 683-8503, Japan
| | - Miya Yoshino
- Division of Immunology, Department of Molecular and Cellular Biology, School of Life Science, Faculty of Medicine, Tottori University, 86 Nishi-Cho, Yonago, Tottori 683-8503, Japan
| | - Shin-Ichi Hayashi
- Division of Immunology, Department of Molecular and Cellular Biology, School of Life Science, Faculty of Medicine, Tottori University, 86 Nishi-Cho, Yonago, Tottori 683-8503, Japan
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11
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Smith SM, Carew NT, Milcarek C. RNA polymerases in plasma cells trav-ELL2 the beat of a different drum. World J Immunol 2015; 5:99-112. [DOI: 10.5411/wji.v5.i3.99] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/26/2015] [Revised: 08/19/2015] [Accepted: 11/17/2015] [Indexed: 02/05/2023] Open
Abstract
There is a major transformation in gene expression between mature B cells (including follicular, marginal zone, and germinal center cells) and antibody secreting cells (ASCs), i.e., ASCs, (including plasma blasts, splenic plasma cells, and long-lived bone marrow plasma cells). This significant change-over occurs to accommodate the massive amount of secretory-specific immunoglobulin that ASCs make and the export processes itself. It is well known that there is an up-regulation of a small number of ASC-specific transcription factors Prdm1 (B-lymphocyte-induced maturation protein 1), interferon regulatory factor 4, and Xbp1, and the reciprocal down-regulation of Pax5, Bcl6 and Bach2, which maintain the B cell program. Less well appreciated are the major alterations in transcription elongation and RNA processing occurring between B cells and ASCs. The three ELL family members ELL1, 2 and 3 have different protein sequences and potentially distinct cellular roles in transcription elongation. ELL1 is involved in DNA repair and small RNAs while ELL3 was previously described as either testis or stem-cell specific. After B cell stimulation to ASCs, ELL3 levels fall precipitously while ELL1 falls off slightly. ELL2 is induced at least 10-fold in ASCs relative to B cells. All of these changes cause the RNA Polymerase II in ASCs to acquire different properties, leading to differences in RNA processing and histone modifications.
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12
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Curinha A, Oliveira Braz S, Pereira-Castro I, Cruz A, Moreira A. Implications of polyadenylation in health and disease. Nucleus 2014; 5:508-19. [PMID: 25484187 DOI: 10.4161/nucl.36360] [Citation(s) in RCA: 99] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Polyadenylation is the RNA processing step that completes the maturation of nearly all eukaryotic mRNAs. It is a two-step nuclear process that involves an endonucleolytic cleavage of the pre-mRNA at the 3'-end and the polymerization of a polyadenosine (polyA) tail, which is fundamental for mRNA stability, nuclear export and efficient translation during development. The core molecular machinery responsible for the definition of a polyA site includes several recognition, cleavage and polyadenylation factors that identify and act on a given polyA signal present in a pre-mRNA, usually an AAUAAA hexamer or similar sequence. This mechanism is tightly regulated by other cis-acting elements and trans-acting factors, and its misregulation can cause inefficient gene expression and may ultimately lead to disease. The majority of genes generate multiple mRNAs as a result of alternative polyadenylation in the 3'-untranslated region. The variable lengths of the 3' untranslated regions created by alternative polyadenylation are a recognizable target for differential regulation and clearly affect the fate of the transcript, ultimately modulating the expression of the gene. Over the past few years, several studies have highlighted the importance of polyadenylation and alternative polyadenylation in gene expression and their impact in a variety of physiological conditions, as well as in several illnesses. Abnormalities in the 3'-end processing mechanisms thus represent a common feature among many oncological, immunological, neurological and hematological disorders, but slight imbalances can lead to the natural establishment of a specific cellular state. This review addresses the key steps of polyadenylation and alternative polyadenylation in different cellular conditions and diseases focusing on the molecular effectors that ensure a faultless pre-mRNA 3' end formation.
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Key Words
- 3′ untranslated region
- 3′READS, 3′ Region Extraction and Deep Sequencing
- AD, Alzheimer disease
- APA, Alternative polyadenylation
- AREs, Au-rich elements
- BPV, bovine papilloma virus
- CAH, congenital adrenal hyperplasia
- CFIm25, Cleavage Factor Im 25 kDa
- COX-2, cyclooxygenase 2
- CPSF, Cleavage and Polyadenylation Specificity Factor
- CSTF2, cleavage stimulatory factor-64kDa
- DMKN, dermokine
- DSE, downstream sequence element
- ESC, embryonic stem cells
- FMR1, Fragil X mental retardation 1
- FOXP3, forkhead box P3
- FXPOI, fragile X-associated immature ovarian insufficiency
- FXS, Fragile X syndrome
- FXTAS, fragile X-associated tremor/ataxia syndrome
- HGRG-14, high-glucose-regulated gene
- IMP-1, Insulin-like growth factor 2 mRNA binding protein 1
- IPEX, immune dysfunction, polyendocrinopathy, enteropathy, X-linked
- LPS, lipopolysaccharide
- OPMD, oculopharyngeal muscular dystrophy
- PABPN1, poly(A) binding protein
- PAP, polyA polymerase
- PAS, polyA site
- PD, Parkinson disease
- PDXK, pyridoxal kinase
- PPIE, peptidylpropylisomerase E
- RBP, RNA-binding protein
- RNA Pol II, RNA polymerase II
- SLE, systemic lupus erythematosus
- SMA, Spinal Muscular Atrophy
- SMN, Survival Motor Neuron
- SNP, single nucleotide polymorphism
- StAR, steroigogenic acute regulatory
- TCF/LEF, T cell factor/lymphoid enhancer factor.
- TCF7L2, transcription factor 7-like 2
- TCR, T cell receptor
- TLI, tandem UTR length index
- TNF-α, tumor necrosis factor-α
- USE, upstream sequence element
- UTR, untranslated region
- WAS, Wiskott-Aldrich syndrome
- WASP, Wiskott-Aldrich syndrome protein
- aSyn, α-Synuclein
- aSynL, longest aSyn isoform
- alternative polyadenylation
- cell state
- disease
- gene expression
- miRNA, microRNA
- nuclear 1
- pA signal, polyA signal
- pA tail, polyA tail
- polyadenylation
- siRNAs, small interfering RNAs
- snRNPs, spliceosomal small nuclear ribonucleoproteins
- α-GalA, α-galactosidase A
- μ, IgM heavy-chain mRNA
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Affiliation(s)
- Ana Curinha
- a Gene Regulation Group; IBMC-Instituto de Biologia Molecular e Celular ; Universidade do Porto ; Porto , Portugal
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13
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Park KS, Bayles I, Szlachta-McGinn A, Paul J, Boiko J, Santos P, Liu J, Wang Z, Borghesi L, Milcarek C. Transcription elongation factor ELL2 drives Ig secretory-specific mRNA production and the unfolded protein response. THE JOURNAL OF IMMUNOLOGY 2014; 193:4663-74. [PMID: 25238757 DOI: 10.4049/jimmunol.1401608] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Differentiation of B cells into Ab-secreting cells induces changes in gene transcription, IgH RNA processing, the unfolded protein response (UPR), and cell architecture. The transcription elongation factor eleven nineteen lysine-rich leukemia gene (ELL2) stimulates the processing of the secreted form of the IgH mRNA from the H chain gene. Mice (mus musculus) with the ELL2 gene floxed in either exon 1 or exon 3 were constructed and crossed to CD19-driven cre/CD19(+). The B cell-specific ELL2 conditional knockouts (cKOs; ell2(loxp/loxp) CD19(cre/+)) exhibit curtailed humoral responses both in 4-hydroxy-3-nitrophenyl acetyl-Ficoll and in 4-hydroxy-3-nitrophenyl acetyl-keyhole limpet hemocyanin immunized animals; recall responses were also diminished. The number of immature and recirculating B cells in the bone marrow is increased in the cKOs, whereas plasma cells in spleen are reduced relative to control animals. There are fewer IgG1 Ab-producing cells in the bone marrow of cKOs. LPS ex vivo-stimulated B220(lo)CD138(+) cells from ELL2-deficient mouse spleens are 4-fold less abundant than from control splenic B cells; have a paucity of secreted IgH; and have distended, abnormal-appearing endoplasmic reticulum. IRE1α is efficiently phosphorylated, but the amounts of Ig κ, ATF6, BiP, Cyclin B2, OcaB (BOB1, Pou2af1), and XBP1 mRNAs, unspliced and spliced, are severely reduced in ELL2-deficient cells. ELL2 enhances the expression of BCMA (also known as Tnfrsf17), which is important for long-term survival. Transcription yields from the cyclin B2 and the canonical UPR promoter elements are upregulated by ELL2 cDNA. Thus, ELL2 is important for many aspects of Ab secretion, XBP1 expression, and the UPR.
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Affiliation(s)
- Kyung Soo Park
- Department of Immunology, University of Pittsburgh, Pittsburgh, PA 15261; and
| | - Ian Bayles
- Department of Immunology, University of Pittsburgh, Pittsburgh, PA 15261; and
| | | | - Joshua Paul
- Department of Immunology, University of Pittsburgh, Pittsburgh, PA 15261; and
| | - Julie Boiko
- Department of Immunology, University of Pittsburgh, Pittsburgh, PA 15261; and
| | - Patricia Santos
- Department of Immunology, University of Pittsburgh, Pittsburgh, PA 15261; and
| | - June Liu
- Department of Immunology, University of Pittsburgh, Pittsburgh, PA 15261; and
| | - Zhou Wang
- Department of Urology, University of Pittsburgh Cancer Institute, Shadyside Medical Center, Pittsburgh, PA 15232
| | - Lisa Borghesi
- Department of Immunology, University of Pittsburgh, Pittsburgh, PA 15261; and
| | - Christine Milcarek
- Department of Immunology, University of Pittsburgh, Pittsburgh, PA 15261; and
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14
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The transcription elongation factor ELL2 is specifically upregulated in HTLV-1-infected T-cells and is dependent on the viral oncoprotein Tax. Virology 2014; 464-465:98-110. [DOI: 10.1016/j.virol.2014.06.028] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2014] [Revised: 04/30/2014] [Accepted: 06/19/2014] [Indexed: 12/18/2022]
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15
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Suzuki MG, Ito H, Aoki F. Effects of RNAi-mediated knockdown of histone methyltransferases on the sex-specific mRNA expression of Imp in the silkworm Bombyx mori. Int J Mol Sci 2014; 15:6772-96. [PMID: 24758924 PMCID: PMC4013661 DOI: 10.3390/ijms15046772] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2014] [Revised: 03/25/2014] [Accepted: 04/10/2014] [Indexed: 12/11/2022] Open
Abstract
Sexual differentiation in Bombyx mori is controlled by sex-specific splicing of Bmdsx, which results in the omission of exons 3 and 4 in a male-specific manner. In B. mori, insulin-like growth factor II mRNA-binding protein (Imp) is a male-specific factor involved in male-specific splicing of Bmdsx. Male-specific Imp mRNA results from the male-specific inclusion of exon 8. To verify the link between histone methylation and alternative RNA processing in Imp, we examined the effects of RNAi-mediated knockdown of several histone methyltransferases on the sex-specific mRNA expression of Imp. As a result, male-specific expression of Imp mRNA was completely abolished when expression of the H3K79 methyltransferase DOT1L was repressed to <10% of that in control males. Chromatin immunoprecipitation-quantitative PCR analysis revealed a higher distribution of H3K79me2 in normal males than in normal females across Imp. RNA polymerase II (RNAP II) processivity assays indicated that RNAi knockdown of DOT1L in males caused a twofold decrease in RNAP II processivity compared to that in control males, with almost equivalent levels to those observed in normal females. Inhibition of RNAP II-mediated elongation in male cells repressed the male-specific splicing of Imp. Our data suggest the possibility that H3K79me2 accumulation along Imp is associated with the male-specific alternative processing of Imp mRNA that results from increased RNAP II processivity.
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Affiliation(s)
- Masataka G Suzuki
- Division of Biological Sciences, Department of Integrated Biosciences, Graduate School of Frontier Sciences, the University of Tokyo, 302 Bioscience-Bldg, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8562, Japan.
| | - Haruka Ito
- Division of Biological Sciences, Department of Integrated Biosciences, Graduate School of Frontier Sciences, the University of Tokyo, 302 Bioscience-Bldg, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8562, Japan.
| | - Fugaku Aoki
- Division of Biological Sciences, Department of Integrated Biosciences, Graduate School of Frontier Sciences, the University of Tokyo, 302 Bioscience-Bldg, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8562, Japan.
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16
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Abstract
B cells can be activated by cognate antigen, anti-B-cell receptor antibody, complement receptors, or polyclonal stimulators like lipopolysaccharide; the overall result is a large shift in RNA processing to the secretory-specific form of immunoglobulin (Ig) heavy chain mRNA and an upregulation of Igh mRNA amounts. Associated with this shift is the large-scale induction of Ig protein synthesis and the unfolded protein response to accommodate the massive quantity of secretory Ig that results. Stimulation to secretion also produces major structural accommodations and stress, with extensive generation of endoplasmic reticulum and Golgi as part of the cellular architecture. Reactive oxygen species can lead to either activation or apoptosis based on context and the high or low oxygen tension surrounding the cells. Transcription elongation factor ELL2 plays an important role in the induction of Ig secretory mRNA production, the unfolded protein response, and gene expression during hypoxia. After antigen stimulation, activated B cells from either the marginal zones or follicles can produce short-lived antibody secreting cells; it is not clear whether cells from both locations can become long-lived plasma cells. Autophagy is necessary for plasma cell long-term survival through the elimination of some of the accumulated damage to the ER from producing so much protein. Survival signals from the bone marrow stromal cells also contribute to plasma cell longevity, with BCMA serving a potentially unique survival role. Integrating the various information pathways converging on the plasma cell is crucial to the development of their long-lived, productive immune response.
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Affiliation(s)
- Ian Bayles
- Department of Immunology, University of Pittsburgh, Pittsburgh, PA 15261
| | - Christine Milcarek
- Department of Immunology, University of Pittsburgh, Pittsburgh, PA 15261
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17
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Arumemi F, Bayles I, Paul J, Milcarek C. Shared and discrete interacting partners of ELL1 and ELL2 by yeast two-hybrid assay. ACTA ACUST UNITED AC 2013. [DOI: 10.4236/abb.2013.47101] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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18
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Kondrashov A, Meijer HA, Barthet-Barateig A, Parker HN, Khurshid A, Tessier S, Sicard M, Knox AJ, Pang L, de Moor CH. Inhibition of polyadenylation reduces inflammatory gene induction. RNA (NEW YORK, N.Y.) 2012; 18:2236-2250. [PMID: 23118416 PMCID: PMC3504674 DOI: 10.1261/rna.032391.112] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2012] [Accepted: 09/14/2012] [Indexed: 05/31/2023]
Abstract
Cordycepin (3' deoxyadenosine) has long been used in the study of in vitro assembled polyadenylation complexes, because it terminates the poly(A) tail and arrests the cleavage complex. It is derived from caterpillar fungi, which are highly prized in Chinese traditional medicine. Here we show that cordycepin specifically inhibits the induction of inflammatory mRNAs by cytokines in human airway smooth muscle cells without affecting the expression of control mRNAs. Cordycepin treatment results in shorter poly(A) tails, and a reduction in the efficiency of mRNA cleavage and transcription termination is observed, indicating that the effects of cordycepin on 3' processing in cells are similar to those described in in vitro reactions. For the CCL2 and CXCL1 mRNAs, the effects of cordycepin are post-transcriptional, with the mRNA disappearing during or immediately after nuclear export. In contrast, although the recruitment of RNA polymerase II to the IL8 promoter is also unaffected, the levels of nascent transcript are reduced, indicating a defect in transcription elongation. We show that a reporter construct with 3' sequences from a histone gene is unaffected by cordycepin, while CXCL1 sequences confer cordycepin sensitivity to the reporter, demonstrating that polyadenylation is indeed required for the effect of cordycepin on gene expression. In addition, treatment with another polyadenyation inhibitor and knockdown of poly(A) polymerase α also specifically reduced the induction of inflammatory mRNAs. These data demonstrate that there are differences in the 3' processing of inflammatory and housekeeping genes and identify polyadenylation as a novel target for anti-inflammatory drugs.
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Affiliation(s)
- Alexander Kondrashov
- School of Pharmacy, The University of Nottingham, Nottingham, NG7 2RD, United Kingdom
| | - Hedda A. Meijer
- School of Clinical Sciences, The University of Nottingham, Nottingham, NG7 2RD, United Kingdom
| | | | - Hannah N. Parker
- School of Pharmacy, The University of Nottingham, Nottingham, NG7 2RD, United Kingdom
| | - Asma Khurshid
- School of Pharmacy, The University of Nottingham, Nottingham, NG7 2RD, United Kingdom
| | - Sarah Tessier
- School of Pharmacy, The University of Nottingham, Nottingham, NG7 2RD, United Kingdom
| | - Marie Sicard
- School of Pharmacy, The University of Nottingham, Nottingham, NG7 2RD, United Kingdom
| | - Alan J. Knox
- School of Clinical Sciences, The University of Nottingham, Nottingham, NG7 2RD, United Kingdom
| | - Linhua Pang
- School of Clinical Sciences, The University of Nottingham, Nottingham, NG7 2RD, United Kingdom
| | - Cornelia H. de Moor
- School of Pharmacy, The University of Nottingham, Nottingham, NG7 2RD, United Kingdom
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19
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The τCstF-64 polyadenylation protein controls genome expression in testis. PLoS One 2012; 7:e48373. [PMID: 23110235 PMCID: PMC3482194 DOI: 10.1371/journal.pone.0048373] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2012] [Accepted: 09/24/2012] [Indexed: 12/21/2022] Open
Abstract
The τCstF-64 polyadenylation protein (gene symbol Cstf2t) is a testis-expressed orthologue of CstF-64. Mice in which Cstf2t was knocked out had a phenotype that was only detected in meiotic and postmeiotic male germ cells, giving us the opportunity to examine CstF-64 function in an isolated developmental system. We performed massively parallel clonally amplified sequencing of cDNAs from testes of wild type and Cstf2t−/− mice. These results revealed that loss of τCstF-64 resulted in large-scale changes in patterns of genome expression. We determined that there was a significant overrepresentation of RNAs from introns and intergenic regions in testes of Cstf2t−/− mice, and a concomitant use of more distal polyadenylation sites. We observed this effect particularly in intronless small genes, many of which are expressed retroposons that likely co-evolved with τCstF-64. Finally, we observed overexpression of long interspersed nuclear element (LINE) sequences in Cstf2t−/− testes. These results suggest that τCstF-64 plays a role in 3′ end determination and transcription termination for a large range of germ cell-expressed genes.
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