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Alejo-Valle O, Weigert K, Bhayadia R, Ng M, Issa H, Beyer C, Emmrich S, Schuschel K, Ihling C, Sinz A, Zimmermann M, Wickenhauser C, Flasinski M, Regenyi E, Labuhn M, Reinhardt D, Yaspo ML, Heckl D, Klusmann JH. The megakaryocytic transcription factor ARID3A suppresses leukemia pathogenesis. Blood 2022; 139:651-665. [PMID: 34570885 PMCID: PMC9632760 DOI: 10.1182/blood.2021012231] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2021] [Accepted: 09/03/2021] [Indexed: 11/22/2022] Open
Abstract
Given the plasticity of hematopoietic stem and progenitor cells, multiple routes of differentiation must be blocked in the the pathogenesis of acute myeloid leukemia, the molecular basis of which is incompletely understood. We report that posttranscriptional repression of the transcription factor ARID3A by miR-125b is a key event in the pathogenesis of acute megakaryoblastic leukemia (AMKL). AMKL is frequently associated with trisomy 21 and GATA1 mutations (GATA1s), and children with Down syndrome are at a high risk of developing the disease. The results of our study showed that chromosome 21-encoded miR-125b synergizes with Gata1s to drive leukemogenesis in this context. Leveraging forward and reverse genetics, we uncovered Arid3a as the main miR-125b target behind this synergy. We demonstrated that, during normal hematopoiesis, this transcription factor promotes megakaryocytic differentiation in concert with GATA1 and mediates TGFβ-induced apoptosis and cell cycle arrest in complex with SMAD2/3. Although Gata1s mutations perturb erythroid differentiation and induce hyperproliferation of megakaryocytic progenitors, intact ARID3A expression assures their megakaryocytic differentiation and growth restriction. Upon knockdown, these tumor suppressive functions are revoked, causing a blockade of dual megakaryocytic/erythroid differentiation and subsequently of AMKL. Inversely, restoring ARID3A expression relieves the arrest of megakaryocytic differentiation in AMKL patient-derived xenografts. This work illustrates how mutations in lineage-determining transcription factors and perturbation of posttranscriptional gene regulation can interact to block multiple routes of hematopoietic differentiation and cause leukemia. In AMKL, surmounting this differentiation blockade through restoration of the tumor suppressor ARID3A represents a promising strategy for treating this lethal pediatric disease.
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Affiliation(s)
- Oriol Alejo-Valle
- Pediatric Hematology and Oncology, Martin-Luther-University Halle-Wittenberg, Halle, Germany
| | - Karoline Weigert
- Pediatric Hematology and Oncology, Martin-Luther-University Halle-Wittenberg, Halle, Germany
| | - Raj Bhayadia
- Pediatric Hematology and Oncology, Department of Pediatrics, Goethe University Frankfurt, Frankfurt (Main), Germany
| | - Michelle Ng
- Pediatric Hematology and Oncology, Martin-Luther-University Halle-Wittenberg, Halle, Germany
| | - Hasan Issa
- Pediatric Hematology and Oncology, Department of Pediatrics, Goethe University Frankfurt, Frankfurt (Main), Germany
| | - Christoph Beyer
- Pediatric Hematology and Oncology, Martin-Luther-University Halle-Wittenberg, Halle, Germany
| | - Stephan Emmrich
- Department of Biology, University of Rochester, Rochester NY
| | - Konstantin Schuschel
- Pediatric Hematology and Oncology, Department of Pediatrics, Goethe University Frankfurt, Frankfurt (Main), Germany
| | - Christian Ihling
- Department of Pharmaceutical Chemistry and Bioanalytics, Institute of Pharmacy, Martin-Luther-University Halle-Wittenberg, Halle, Germany
| | - Andrea Sinz
- Department of Pharmaceutical Chemistry and Bioanalytics, Institute of Pharmacy, Martin-Luther-University Halle-Wittenberg, Halle, Germany
| | - Martin Zimmermann
- Pediatric Hematology and Oncology, Hannover Medical School, Hannover, Germany
| | | | - Marius Flasinski
- Department of Psychiatry, Psychosomatic Medicine and Psychotherapy, Hospital Tauberbischofsheim, Tauberbischofsheim, Germany
| | - Eniko Regenyi
- Pediatric Hematology and Oncology, Martin-Luther-University Halle-Wittenberg, Halle, Germany
- Max Planck Institute for Molecular Genetics, Berlin, Germany
| | - Maurice Labuhn
- Institute for Experimental Virology, Twincore, Center for Experimental and Clinical Infection Research, Hannover, Germany; and
| | - Dirk Reinhardt
- Pediatric Hematology and Oncology, Pediatrics III, University Hospital Essen, Essen, Germany
| | | | - Dirk Heckl
- Pediatric Hematology and Oncology, Martin-Luther-University Halle-Wittenberg, Halle, Germany
| | - Jan-Henning Klusmann
- Pediatric Hematology and Oncology, Martin-Luther-University Halle-Wittenberg, Halle, Germany
- Pediatric Hematology and Oncology, Department of Pediatrics, Goethe University Frankfurt, Frankfurt (Main), Germany
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2
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Abstract
Systemic lupus erythematosus (SLE) is a devastating and heterogeneous autoimmune disease that affects multiple organs, and for which the underlying causes are unknown. The majority of SLE patients produce autoantibodies, have increased levels of type-I inflammatory cytokines, and can develop glomerulonephritis. Recent studies indicate an unexpected but strong association between increased disease activity in SLE patients and the expression of the DNA-binding protein ARID3a (A + T rich interaction domain protein 3a) in a number of peripheral blood cell types. ARID3a expression was first associated with autoantibody production in B cells; however, more recent findings also indicate associations with expression of the inflammatory cytokine interferon alpha in SLE plasmacytoid dendritic cells and low-density neutrophils. In addition, ARID3a is expressed in hematopoietic stem cells and some adult kidney progenitor cells. SLE cells expressing enhanced ARID3a levels show differential gene expression patterns compared with homologous healthy control cells, identifying new pathways potentially regulated by ARID3a. The associations of ARID3a expression with increased disease severity in SLE, suggest that it, or its downstream targets, may provide new therapeutic targets for SLE.
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3
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Suzuki N, Hirano K, Ogino H, Ochi H. Arid3a regulates nephric tubule regeneration via evolutionarily conserved regeneration signal-response enhancers. eLife 2019; 8:43186. [PMID: 30616715 PMCID: PMC6324879 DOI: 10.7554/elife.43186] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2018] [Accepted: 12/18/2018] [Indexed: 12/15/2022] Open
Abstract
Amphibians and fish have the ability to regenerate numerous tissues, whereas mammals have a limited regenerative capacity. Despite numerous developmental genes becoming reactivated during regeneration, an extensive analysis is yet to be performed on whether highly regenerative animals utilize unique cis-regulatory elements for the reactivation of genes during regeneration and how such cis-regulatory elements become activated. Here, we screened regeneration signal-response enhancers at the lhx1 locus using Xenopus and found that the noncoding elements conserved from fish to human function as enhancers in the regenerating nephric tubules. A DNA-binding motif of Arid3a, a component of H3K9me3 demethylases, was commonly found in RSREs. Arid3a binds to RSREs and reduces the H3K9me3 levels. It promotes cell cycle progression and causes the outgrowth of nephric tubules, whereas the conditional knockdown of arid3a using photo-morpholino inhibits regeneration. These results suggest that Arid3a contributes to the regeneration of nephric tubules by decreasing H3K9me3 on RSREs.
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Affiliation(s)
- Nanoka Suzuki
- Institute for Promotion of Medical Science Research, Yamagata University, Faculty of Medicine, Yamagata, Japan
| | - Kodai Hirano
- Institute for Promotion of Medical Science Research, Yamagata University, Faculty of Medicine, Yamagata, Japan
| | - Hajime Ogino
- Amphibian Research Center, Hiroshima University, Higashi-hiroshima, Japan
| | - Haruki Ochi
- Institute for Promotion of Medical Science Research, Yamagata University, Faculty of Medicine, Yamagata, Japan
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4
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Khedgikar V, Abbruzzese G, Mathavan K, Szydlo H, Cousin H, Alfandari D. Dual control of pcdh8l/PCNS expression and function in Xenopus laevis neural crest cells by adam13/33 via the transcription factors tfap2α and arid3a. eLife 2017; 6:26898. [PMID: 28829038 PMCID: PMC5601995 DOI: 10.7554/elife.26898] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2017] [Accepted: 08/21/2017] [Indexed: 01/11/2023] Open
Abstract
Adam13/33 is a cell surface metalloprotease critical for cranial neural crest (CNC) cell migration. It can cleave multiple substrates including itself, fibronectin, ephrinB, cadherin-11, pcdh8 and pcdh8l (this work). Cleavage of cadherin-11 produces an extracellular fragment that promotes CNC migration. In addition, the adam13 cytoplasmic domain is cleaved by gamma secretase, translocates into the nucleus and regulates multiple genes. Here, we show that adam13 interacts with the arid3a/dril1/Bright transcription factor. This interaction promotes a proteolytic cleavage of arid3a and its translocation to the nucleus where it regulates another transcription factor: tfap2α. Tfap2α in turn activates multiple genes including the protocadherin pcdh8l (PCNS). The proteolytic activity of adam13 is critical for the release of arid3a from the plasma membrane while the cytoplasmic domain appears critical for the cleavage of arid3a. In addition to this transcriptional control of pcdh8l, adam13 cleaves pcdh8l generating an extracellular fragment that also regulates cell migration.
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Affiliation(s)
- Vikram Khedgikar
- Department of Veterinary and Animal Sciences, University of Massachusetts, Amherst, United States
| | - Genevieve Abbruzzese
- David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, United States
| | - Ketan Mathavan
- Department of Veterinary and Animal Sciences, University of Massachusetts, Amherst, United States.,Molecular and Cellular Biology graduate program, University of Massachusetts, Amherst, United States
| | - Hannah Szydlo
- Department of Veterinary and Animal Sciences, University of Massachusetts, Amherst, United States
| | - Helene Cousin
- Department of Veterinary and Animal Sciences, University of Massachusetts, Amherst, United States
| | - Dominique Alfandari
- Department of Veterinary and Animal Sciences, University of Massachusetts, Amherst, United States.,Molecular and Cellular Biology graduate program, University of Massachusetts, Amherst, United States
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5
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Ratliff ML, Mishra M, Frank MB, Guthridge JM, Webb CF. The Transcription Factor ARID3a Is Important for In Vitro Differentiation of Human Hematopoietic Progenitors. THE JOURNAL OF IMMUNOLOGY 2015; 196:614-23. [PMID: 26685208 DOI: 10.4049/jimmunol.1500355] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2015] [Accepted: 11/10/2015] [Indexed: 12/12/2022]
Abstract
We recently reported that the transcription factor ARID3a is expressed in a subset of human hematopoietic progenitor stem cells in both healthy individuals and in patients with systemic lupus erythematosus. Numbers of ARID3a(+) lupus hematopoietic stem progenitor cells were associated with increased production of autoreactive Abs when those cells were introduced into humanized mouse models. Although ARID3a/Bright knockout mice died in utero, they exhibited decreased numbers of hematopoietic stem cells and erythrocytes, indicating that ARID3a is functionally important for hematopoiesis in mice. To explore the requirement for ARID3a for normal human hematopoiesis, hematopoietic stem cell progenitors from human cord blood were subjected to both inhibition and overexpression of ARID3a in vitro. Inhibition of ARID3a resulted in decreased B lineage cell production accompanied by increases in cells with myeloid lineage markers. Overexpression of ARID3a inhibited both myeloid and erythroid differentiation. Additionally, inhibition of ARID3a in hematopoietic stem cells resulted in altered expression of transcription factors associated with hematopoietic lineage decisions. These results suggest that appropriate regulation of ARID3a is critical for normal development of both myeloid and B lineage pathways.
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Affiliation(s)
| | - Meenu Mishra
- Walter Reed Army Institute of Research, Silver Spring, MD 20910
| | - Mark B Frank
- Oklahoma Medical Research Foundation, Oklahoma City, OK 73104
| | | | - Carol F Webb
- Oklahoma Medical Research Foundation, Oklahoma City, OK 73104; Department of Microbiology and Immunology, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104; and Department of Cell Biology, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104
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6
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Iwasaki Y, Thomsen GH. The splicing factor PQBP1 regulates mesodermal and neural development through FGF signaling. Development 2014; 141:3740-51. [PMID: 25209246 DOI: 10.1242/dev.106658] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Alternative splicing of pre-mRNAs is an important means of regulating developmental processes, yet the molecular mechanisms governing alternative splicing in embryonic contexts are just beginning to emerge. Polyglutamine-binding protein 1 (PQBP1) is an RNA-splicing factor that, when mutated, in humans causes Renpenning syndrome, an X-linked intellectual disability disease characterized by severe cognitive impairment, but also by physical defects that suggest PQBP1 has broader functions in embryonic development. Here, we reveal essential roles for PQBP1 and a binding partner, WBP11, in early development of Xenopus embryos. Both genes are expressed in the nascent mesoderm and neurectoderm, and morpholino knockdown of either causes defects in differentiation and morphogenesis of the mesoderm and neural plate. At the molecular level, knockdown of PQBP1 in Xenopus animal cap explants inhibits target gene induction by FGF but not by BMP, Nodal or Wnt ligands, and knockdown of either PQBP1 or WBP11 in embryos inhibits expression of fgf4 and FGF4-responsive cdx4 genes. Furthermore, PQBP1 knockdown changes the alternative splicing of FGF receptor-2 (FGFR2) transcripts, altering the incorporation of cassette exons that generate receptor variants (FGFR2 IIIb or IIIc) with different ligand specificities. Our findings may inform studies into the mechanisms underlying Renpenning syndrome.
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Affiliation(s)
- Yasuno Iwasaki
- Department of Biochemistry and Cell Biology, Center for Developmental Genetics, Stony Brook University, Stony Brook, NY 11794-5215, USA
| | - Gerald H Thomsen
- Department of Biochemistry and Cell Biology, Center for Developmental Genetics, Stony Brook University, Stony Brook, NY 11794-5215, USA
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7
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Ratliff ML, Templeton TD, Ward JM, Webb CF. The Bright Side of Hematopoiesis: Regulatory Roles of ARID3a/Bright in Human and Mouse Hematopoiesis. Front Immunol 2014; 5:113. [PMID: 24678314 PMCID: PMC3958700 DOI: 10.3389/fimmu.2014.00113] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2014] [Accepted: 03/04/2014] [Indexed: 12/12/2022] Open
Abstract
ARID3a/Bright is a DNA-binding protein that was originally discovered for its ability to increase immunoglobulin transcription in antigen-activated B cells. It interacts with DNA as a dimer through its ARID, or A/T-rich interacting domain. In association with other proteins, ARID3a increased transcription of the immunoglobulin heavy chain and led to improved chromatin accessibility of the heavy chain enhancer. Constitutive expression of ARID3a in B lineage cells resulted in autoantibody production, suggesting its regulation is important. Abnormal ARID3a expression has also been associated with increased proliferative capacity and malignancy. Roles for ARID3a in addition to interactions with the immunoglobulin locus were suggested by transgenic and knockout mouse models. Over-expression of ARID3a resulted in skewing of mature B cell subsets and altered gene expression patterns of follicular B cells, whereas loss of function resulted in loss of B1 lineage B cells and defects in hematopoiesis. More recent studies showed that loss of ARID3a in adult somatic cells promoted developmental plasticity, alterations in gene expression patterns, and lineage fate decisions. Together, these data suggest new regulatory roles for ARID3a. The genes influenced by ARID3a are likely to play pivotal roles in lineage decisions, highlighting the importance of this understudied transcription factor.
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Affiliation(s)
- Michelle L Ratliff
- Immunobiology and Cancer Research, Oklahoma Medical Research Foundation , Oklahoma City, OK , USA
| | - Troy D Templeton
- Department of Cell Biology, University of Oklahoma Health Sciences Center , Oklahoma City, OK , USA
| | - Julie M Ward
- Department of Microbiology and Immunology, University of Oklahoma Health Sciences Center , Oklahoma City, OK , USA
| | - Carol F Webb
- Immunobiology and Cancer Research, Oklahoma Medical Research Foundation , Oklahoma City, OK , USA ; Department of Cell Biology, University of Oklahoma Health Sciences Center , Oklahoma City, OK , USA ; Department of Microbiology and Immunology, University of Oklahoma Health Sciences Center , Oklahoma City, OK , USA
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8
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Popowski M, Templeton TD, Lee BK, Rhee C, Li H, Miner C, Dekker JD, Orlanski S, Bergman Y, Iyer VR, Webb CF, Tucker H. Bright/Arid3A acts as a barrier to somatic cell reprogramming through direct regulation of Oct4, Sox2, and Nanog. Stem Cell Reports 2014; 2:26-35. [PMID: 24511468 PMCID: PMC3916758 DOI: 10.1016/j.stemcr.2013.12.002] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2013] [Revised: 12/03/2013] [Accepted: 12/04/2013] [Indexed: 02/06/2023] Open
Abstract
We show here that singular loss of the Bright/Arid3A transcription factor leads to reprograming of mouse embryonic fibroblasts (MEFs) and enhancement of standard four-factor (4F) reprogramming. Bright-deficient MEFs bypass senescence and, under standard embryonic stem cell (ESC) culture conditions, spontaneously form clones that in vitro express pluripotency markers, differentiate to all germ lineages, and in vivo form teratomas and chimeric mice. We demonstrate that BRIGHT binds directly to the promoter/enhancer regions of Oct4, Sox2, and Nanog to contribute to their repression in both MEFs and ESCs. Thus, elimination of the BRIGHT barrier may provide an approach for somatic cell reprogramming. Loss of Bright can alone reprogram or enhance conventional four-factor reprogramming Bright directly represses Oct4, Sox2, and Nanog Bright may function in somatic and embryonic stem cells to enforce differentiation
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Affiliation(s)
- Melissa Popowski
- Institute for Cellular and Molecular Biology, University of Texas at Austin, Austin, TX 78712, USA
| | - Troy D Templeton
- Immunobiology and Cancer Program, Oklahoma Medical Research Foundation, Departments of Cell Biology and Microbiology and Immunology, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA
| | - Bum-Kyu Lee
- Institute for Cellular and Molecular Biology, University of Texas at Austin, Austin, TX 78712, USA
| | - Catherine Rhee
- Institute for Cellular and Molecular Biology, University of Texas at Austin, Austin, TX 78712, USA
| | - He Li
- Immunobiology and Cancer Program, Oklahoma Medical Research Foundation, Departments of Cell Biology and Microbiology and Immunology, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA
| | - Cathrine Miner
- Immunobiology and Cancer Program, Oklahoma Medical Research Foundation, Departments of Cell Biology and Microbiology and Immunology, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA
| | - Joseph D Dekker
- Institute for Cellular and Molecular Biology, University of Texas at Austin, Austin, TX 78712, USA
| | - Shari Orlanski
- Department of Developmental Biology and Cancer Research, The Hebrew University Medical School, Jerusalem 91120, Israel
| | - Yehudit Bergman
- Department of Developmental Biology and Cancer Research, The Hebrew University Medical School, Jerusalem 91120, Israel
| | - Vishwanath R Iyer
- Institute for Cellular and Molecular Biology, University of Texas at Austin, Austin, TX 78712, USA
| | - Carol F Webb
- Immunobiology and Cancer Program, Oklahoma Medical Research Foundation, Departments of Cell Biology and Microbiology and Immunology, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA
| | - Haley Tucker
- Institute for Cellular and Molecular Biology, University of Texas at Austin, Austin, TX 78712, USA
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9
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Sorrentino GM, Gillis WQ, Oomen-Hajagos J, Thomsen GH. Conservation and evolutionary divergence in the activity of receptor-regulated smads. EvoDevo 2012; 3:22. [PMID: 23020873 PMCID: PMC3500652 DOI: 10.1186/2041-9139-3-22] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2012] [Accepted: 08/09/2012] [Indexed: 01/20/2023] Open
Abstract
Background Activity of the Transforming growth factor-β (TGFβ) pathway is essential to the establishment of body axes and tissue differentiation in bilaterians. Orthologs for core pathway members have been found in all metazoans, but uncertain homology of the body axes and tissues patterned by these signals raises questions about the activities of these molecules across the metazoan tree. We focus on the principal canonical transduction proteins (R-Smads) of the TGFβ pathway, which instruct both axial patterning and tissue differentiation in the developing embryo. We compare the activity of R-Smads from a cnidarian (Nematostella vectensis), an arthropod (Drosophila melanogaster), and a vertebrate (Xenopus laevis) in Xenopus embryonic assays. Results Overexpressing NvSmad1/5 ventralized Xenopus embryos when expressed in dorsal blastomeres, similar to the effects of Xenopus Smad1. However, NvSmad1/5 was less potent than XSmad1 in its ability to activate downstream target genes in Xenopus animal cap assays. NvSmad2/3 strongly induced general mesendodermal marker genes, but weakly induced ones involved in specifying the Spemann organizer. NvSmad2/3 was unable to induce a secondary trunk axis in Xenopus embryos, whereas the orthologs from Xenopus (XSmad2 and XSmad3) and Drosophila (dSmad2) were capable of doing so. Replacement of the NvSmad2/3 MH2 domain with the Xenopus XSmad2 MH2 slightly increased its inductive capability, but did not confer an ability to generate a secondary body axis. Conclusions Vertebrate and cnidarian Smad1/5 have similar axial patterning and induction activities, although NvSmad1/5 is less efficient than the vertebrate gene. We conclude that the activities of Smad1/5 orthologs have been largely conserved across Metazoa. NvSmad2/3 efficiently activates general mesendoderm markers, but is unable to induce vertebrate organizer-specific genes or to produce a secondary body axis in Xenopus. Orthologs dSmad2 and XSmad3 generate a secondary body axis, but activate only low expression of organizer-specific genes that are strongly induced by XSmad2. We suggest that in the vertebrate lineage, Smad2 has evolved a specialized role in the induction of the embryonic organizer. Given the high level of sequence identity between Smad orthologs, this work underscores the functional importance of the emergence and fixation of a few divergent amino acids among orthologs during evolution.
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Affiliation(s)
- Gina M Sorrentino
- Department of Biochemistry and Cell Biology, Stony Brook University, Life Sciences Building room 450, Stony Brook, NY, 11794-5215, USA.
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10
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Lestari W, Ichwan SJA, Otsu M, Yamada S, Iseki S, Shimizu S, Ikeda MA. Cooperation between ARID3A and p53 in the transcriptional activation of p21WAF1 in response to DNA damage. Biochem Biophys Res Commun 2011; 417:710-6. [PMID: 22172947 DOI: 10.1016/j.bbrc.2011.12.003] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2011] [Accepted: 12/01/2011] [Indexed: 01/27/2023]
Abstract
ARID3A/DRIL1/Bright is a family member of the AT rich interaction domain (ARID) DNA-binding proteins that are involved in diverse biological processes. We have reported that p53 activates ARID3A transcription, and ARID3A overexpression induces G1 arrest. However, the role of ARID3A in the p53 pathway remains unclear. Here, we show that ARID3A cooperates with p53 to transcriptionally activate p21(WAF1), a p53-target gene important for cell-cycle arrest. ARID3A bound to its binding sites in the p21(WAF1) promoter in vivo and in vitro, and induced p21(WAF1) transcription in U2OS cells expressing wild-type p53 but not Saos-2 cells lacking p53. The co-expression of ARID3A with p53 cooperates to activate p21(WAF1) transcription and the stably transfected p21(WAF1) promoter. Mutation of the ARID3A binding sites reduced the p21(WAF1) promoter activity, and siRNA-based ARID3A knockdown suppressed the transcription of p21(WAF1), but not the proapoptotic NOXA and PUMA in response to DNA damage. Furthermore, p53 knockdown decreased ARID3A transcription, and, conversely, ARID3A overexpression and knockdown resulted in an increase or decrease in p53 stability, respectively. These results indicate both cooperative and interdependent roles for ARID3A and p53 in the transcriptional activation of p21(WAF1) in response to DNA damage.
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Affiliation(s)
- Widya Lestari
- Section of Molecular Craniofacial Embryology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
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11
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An G, Miner CA, Nixon JC, Kincade PW, Bryant J, Tucker PW, Webb CF. Loss of Bright/ARID3a function promotes developmental plasticity. Stem Cells 2010; 28:1560-7. [PMID: 20680960 DOI: 10.1002/stem.491] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
B-cell regulator of immunoglobulin heavy chain transcription (Bright)/ARID3a, an A+T-rich interaction domain protein, was originally discovered in B lymphocyte lineage cells. However, expression patterns and high lethality levels in knockout mice suggested that it had additional functions. Three independent lines of evidence show that functional inhibition of Bright results in increased developmental plasticity. Bright-deficient cells from two mouse models expressed a number of pluripotency-associated gene products, expanded indefinitely, and spontaneously differentiated into cells of multiple lineages. Furthermore, direct knockdown of human Bright resulted in colonies capable of expressing multiple lineage markers. These data suggest that repression of this single molecule confers adult somatic cells with new developmental options.
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Affiliation(s)
- Guangyu An
- Immunobiology and Cancer Program, Oklahoma Medical Research Foundation, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, USA
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12
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Prieur A, Nacerddine K, van Lohuizen M, Peeper DS. SUMOylation of DRIL1 directs its transcriptional activity towards leukocyte lineage-specific genes. PLoS One 2009; 4:e5542. [PMID: 19436740 PMCID: PMC2677661 DOI: 10.1371/journal.pone.0005542] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2009] [Accepted: 04/18/2009] [Indexed: 11/18/2022] Open
Abstract
DRIL1 is an ARID family transcription factor that can immortalize primary mouse fibroblasts, bypass RASV12-induced cellular senescence and collaborate with RASV12 or MYC in mediating oncogenic transformation. It also activates immunoglobulin heavy chain transcription and engages in heterodimer formation with E2F to stimulate E2F-dependent transcription. Little, however, is known about the regulation of DRIL1 activity. Recently, DRIL1 was found to interact with the SUMO-conjugating enzyme Ubc9, but the functional relevance of this association has not been assessed. Here, we show that DRIL1 is sumoylated both in vitro and in vivo at lysine 398. Moreover, we provide evidence that PIASy functions as a specific SUMO E3-ligase for DRIL1 and promotes its sumoylation both in vitro and in vivo. Furthermore, consistent with the subnuclear localization of PIASy in the Matrix-Associated Region (MAR), SUMO-modified DRIL1 species are found exclusively in the MAR fraction. This post-translational modification interferes neither with the subcellular localization nor the DNA-binding activity of the protein. In contrast, DRIL1 sumoylation impairs its interaction with E2F1 in vitro and modifies its transcriptional activity in vivo, driving transcription of subset of genes regulating leukocyte fate. Taken together, these results identify sumoylation as a novel post-translational modification of DRIL1 that represents an important mechanism for targeting and modulating DRIL1 transcriptional activity.
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Affiliation(s)
- Alexandre Prieur
- Department of Molecular Genetics, The Netherlands Cancer Institute, Amsterdam, The Netherlands
| | - Karim Nacerddine
- Department of Molecular Genetics, The Netherlands Cancer Institute, Amsterdam, The Netherlands
| | - Maarten van Lohuizen
- Department of Molecular Genetics, The Netherlands Cancer Institute, Amsterdam, The Netherlands
| | - Daniel S. Peeper
- Department of Molecular Genetics, The Netherlands Cancer Institute, Amsterdam, The Netherlands
- * E-mail:
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13
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Nixon JC, Ferrell S, Miner C, Oldham AL, Hochgeschwender U, Webb CF. Transgenic mice expressing dominant-negative bright exhibit defects in B1 B cells. THE JOURNAL OF IMMUNOLOGY 2008; 181:6913-22. [PMID: 18981111 DOI: 10.4049/jimmunol.181.10.6913] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The transcription factor Bright up-regulates Ig H chain production from select V region promoters and requires Bright dimerization, Bruton's tyrosine kinase (Btk), and the Btk substrate, TFII-I, for this activity. Defects in Btk cause X-linked immunodeficiency disease in mice and humans. Btk-deficient mice exhibit decreased serum IgM production, B cell developmental blocks, absence of peritoneal B1 cells, and subnormal immune responses against Ags, including phosphorylcholine, which confer protection against Streptococcus pneumoniae. Transgenic mice expressing dominant-negative Bright share similarities with Btk-deficient mice, including decreased serum IgM, poor anti-phosphorylcholine responses, and slightly reduced numbers of mature B cells. Although dominant-negative Bright mice developed B1 B cells, these were functionally deficient in Ig secretion. These data suggest a mechanistic explanation for the abnormal responses to phosphorylcholine observed in Btk-deficient mice, and indicate that Bright functions in a subset of Btk-dependent pathways in vivo, particularly those responses dominated by B1 B cells.
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Affiliation(s)
- Jamee C Nixon
- Oklahoma Medical Research Foundation, Oklahoma City, OK 73104, USA
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Lin L, Zhou Z, Zheng L, Alber S, Watkins S, Ray P, Kaminski N, Zhang Y, Morse D. Cross talk between Id1 and its interactive protein Dril1 mediate fibroblast responses to transforming growth factor-beta in pulmonary fibrosis. THE AMERICAN JOURNAL OF PATHOLOGY 2008; 173:337-46. [PMID: 18583319 DOI: 10.2353/ajpath.2008.070915] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
The presence of activated fibroblasts or myofibroblasts represents a hallmark of progressive lung fibrosis. Because the transcriptional response of fibroblasts to transforming growth factor-beta(1) (TGF-beta(1)) is a determinant of disease progression, we investigated the role of the transcriptional regulator inhibitor of differentiation-1 (Id1) in the setting of lung fibrosis. Mice lacking the gene for Id1 had increased susceptibility to bleomycin-induced lung fibrosis, and fibroblasts lacking Id1 exhibited enhanced responses to TGF-beta(1). Because the effect of Id1 on fibrosis could not be explained by known mechanisms, we performed protein interaction screening and identified a novel binding partner for Id1, known as dead ringer-like-1 (Dril1). Dril1 shares structural similarities with Id1 and was recently implicated in TGF-beta(1) signaling during embryogenesis. To date, little is known about the function of Dril1 in humans. Although it has not been previously implicated in fibrotic disease, we found that Dril1 was highly expressed in lungs from patients with idiopathic pulmonary fibrosis and was regulated by TGF-beta(1) in human fibroblasts. Dril1 enhanced activation of TGF-beta(1) target genes, whereas Id1 decreased expression of these same molecules. Id1 inhibited DNA binding by Dril1, and the two proteins co-localized in vitro and in vivo, providing a potential mechanism for suppression of fibrosis by Id1 through inhibition of the profibrotic function of Dril1.
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Affiliation(s)
- Ling Lin
- Division of Pulmonary, Allergy, and Critical Care Medicine, University of Pittsburgh School of Medicine, Pittsburgh, PA 15217, USA
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Kim D, Tucker PW. A regulated nucleocytoplasmic shuttle contributes to Bright's function as a transcriptional activator of immunoglobulin genes. Mol Cell Biol 2006; 26:2187-201. [PMID: 16507996 PMCID: PMC1430300 DOI: 10.1128/mcb.26.6.2187-2201.2006] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2005] [Revised: 12/08/2005] [Accepted: 12/21/2005] [Indexed: 11/20/2022] Open
Abstract
Bright/ARID3a has been implicated in mitogen- and growth factor-induced up-regulation of immunoglobulin heavy-chain (IgH) genes and in E2F1-dependent G1/S cell cycle progression. For IgH transactivation, Bright binds to nuclear matrix association regions upstream of certain variable region promoters and flanking the IgH intronic enhancer. While Bright protein was previously shown to reside within the nuclear matrix, we show here that a significant amount of Bright resides in the cytoplasm of normal and transformed B cells. Leptomycin B, chromosome region maintenance 1 (CRM1) overexpression, and heterokaryon experiments indicate that Bright actively shuttles between the nucleus and the cytoplasm in a CRM1-dependent manner. We mapped the functional nuclear localization signal to the N-terminal region of REKLES, a domain conserved within ARID3 paralogues. Residues within the C terminus of REKLES contain its nuclear export signal, whose regulation is primarily responsible for Bright shuttling. Growth factor depletion and cell synchronization experiments indicated that Bright shuttling during S phase of the cell cycle leads to an increase in its nuclear abundance. Finally, we show that shuttle-incompetent Bright point mutants, even if sequestered within the nucleus, are incapable of transactivating an IgH reporter gene. Therefore, regulation of Bright's cellular localization appears to be required for its function.
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Affiliation(s)
- Dongkyoon Kim
- University of Texas at Austin, Molecular Genetics and Microbiology, 1 University Station A5000, Room ESB-532, Austin, TX 78712-0162, USA
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