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Tzani A, Haemmig S, Cheng HS, Perez-Cremades D, Augusto Heuschkel M, Jamaiyar A, Singh S, Aikawa M, Yu P, Wang T, Ye S, Feinberg MW, Plutzky J. FAM222A, Part of the BET-Regulated Basal Endothelial Transcriptome, Is a Novel Determinant of Endothelial Biology and Angiogenesis-Brief Report. Arterioscler Thromb Vasc Biol 2024; 44:143-155. [PMID: 37942611 PMCID: PMC10840377 DOI: 10.1161/atvbaha.123.319909] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2023] [Accepted: 10/17/2023] [Indexed: 11/10/2023]
Abstract
BACKGROUND BETs (bromodomain and extraterminal domain-containing epigenetic reader proteins), including BRD4 (bromodomain-containing protein 4), orchestrate transcriptional programs induced by pathogenic stimuli, as intensively studied in cardiovascular disease and elsewhere. In endothelial cells (ECs), BRD4 directs induced proinflammatory, proatherosclerotic transcriptional responses; BET inhibitors, like JQ1, repress these effects and decrease atherosclerosis. While BET effects in pathogenic conditions have prompted therapeutic BET inhibitor development, BET action under basal conditions, including ECs, has remained understudied. To understand BET action in basal endothelial transcriptional programs, we first analyzed EC RNA-Seq data in the absence versus presence of JQ1 before using BET regulation to identify novel determinants of EC biology and function. METHODS RNA-Seq datasets of human umbilical vein ECs without and with JQ1 treatment were analyzed. After identifying C12orf34, also known as FAM222A (family with sequence similarity 222 member A), as a previously unreported, basally expressed, potently JQ1-induced EC gene, FAM222A was studied in endothelial and angiogenic responses in vitro using small-interference RNA silencing and lentiviral overexpression, in vitro, ex vivo and in vivo, including aortic sprouting, matrigel plug assays, and murine neonatal oxygen-induced retinopathy. RESULTS Resting EC RNA-Seq data indicate BETs direct transcriptional programs underlying core endothelial properties including migration, proliferation, and angiogenesis. BET inhibition in resting ECs also significantly induced a subset of mRNAs, including FAM222A-a unique BRD4-regulated gene with no reported EC role. Silencing endothelial FAM222A significantly decreased cellular proliferation, migration, network formation, aorta sprouting, and Matrigel plug vascularization through coordinated modulation of VEGF (vascular endothelial growth factor) and NOTCH mediator expression in vitro, ex vivo, in vivo; lentiviral FAM222A overexpression had opposite effects. In vivo, siFAM222A significantly repressed retinal revascularization in neonatal murine oxygen-induced retinopathy through similar angiogenic signaling modulation. CONCLUSIONS BET control over the basal endothelial transcriptome includes FAM222A, a novel, BRD4-regulated, key determinant of endothelial biology and angiogenesis.
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Affiliation(s)
- Aspasia Tzani
- Division of Cardiovascular Medicine, Brigham and Women’s Hospital, Boston, MA 02115
- Harvard Medical School, Boston, MA 02115
| | - Stefan Haemmig
- Division of Cardiovascular Medicine, Brigham and Women’s Hospital, Boston, MA 02115
- Harvard Medical School, Boston, MA 02115
| | - Henry S. Cheng
- Division of Cardiovascular Medicine, Brigham and Women’s Hospital, Boston, MA 02115
- Harvard Medical School, Boston, MA 02115
| | - Daniel Perez-Cremades
- Division of Cardiovascular Medicine, Brigham and Women’s Hospital, Boston, MA 02115
- Harvard Medical School, Boston, MA 02115
| | - Marina Augusto Heuschkel
- Division of Cardiovascular Medicine, Brigham and Women’s Hospital, Boston, MA 02115
- Harvard Medical School, Boston, MA 02115
| | - Anurag Jamaiyar
- Division of Cardiovascular Medicine, Brigham and Women’s Hospital, Boston, MA 02115
- Harvard Medical School, Boston, MA 02115
| | - Sasha Singh
- Division of Cardiovascular Medicine, Brigham and Women’s Hospital, Boston, MA 02115
- Harvard Medical School, Boston, MA 02115
| | - Masanori Aikawa
- Division of Cardiovascular Medicine, Brigham and Women’s Hospital, Boston, MA 02115
- Harvard Medical School, Boston, MA 02115
| | - Paul Yu
- Division of Cardiovascular Medicine, Brigham and Women’s Hospital, Boston, MA 02115
- Harvard Medical School, Boston, MA 02115
| | - Tianxi Wang
- Department of Ophthalmology, Boston Children’s Hospital, Boston, MA 02115
- Harvard Medical School, Boston, MA 02115
| | - Sun Ye
- Department of Ophthalmology, Boston Children’s Hospital, Boston, MA 02115
- Harvard Medical School, Boston, MA 02115
| | - Mark W. Feinberg
- Division of Cardiovascular Medicine, Brigham and Women’s Hospital, Boston, MA 02115
- Harvard Medical School, Boston, MA 02115
| | - Jorge Plutzky
- Division of Cardiovascular Medicine, Brigham and Women’s Hospital, Boston, MA 02115
- Harvard Medical School, Boston, MA 02115
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Nguyen D, Buisine N, Fayol O, Michels AA, Bensaude O, Price DH, Uguen P. An alternative D. melanogaster 7SK snRNP. BMC Mol Cell Biol 2021; 22:43. [PMID: 34461828 PMCID: PMC8406779 DOI: 10.1186/s12860-021-00381-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2021] [Accepted: 08/13/2021] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND The 7SK small nuclear RNA (snRNA) found in most metazoans is a key regulator of P-TEFb which in turn regulates RNA polymerase II elongation. Although its primary sequence varies in protostomes, its secondary structure and function are conserved across evolutionary distant taxa. RESULTS Here, we describe a novel ncRNA sharing many features characteristic of 7SK RNAs, in D. melanogaster. We examined the structure of the corresponding gene and determined the expression profiles of the encoded RNA, called snRNA:7SK:94F, during development. It is probably produced from the transcription of a lncRNA which is processed into a mature snRNA. We also addressed its biological function and we show that, like dm7SK, this alternative 7SK interacts in vivo with the different partners of the P-TEFb complex, i.e. HEXIM, LARP7 and Cyclin T. This novel RNA is widely expressed across tissues. CONCLUSION We propose that two distinct 7SK genes might contribute to the formation of the 7SK snRNP complex in D. melanogaster.
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Affiliation(s)
- Duy Nguyen
- Université Paris-Saclay, INSERM, CNRS, Interactions cellulaires et physiopathologie hépatique, Bât.440, 91405, Orsay, France
| | | | - Olivier Fayol
- Université Paris-Saclay, INSERM, CNRS, Interactions cellulaires et physiopathologie hépatique, Bât.440, 91405, Orsay, France
| | | | - Olivier Bensaude
- IBENS Paris, UMR CNRS 8197; UA INSERM 1024, 75005, Paris, France
| | - David H Price
- Department of Biochemistry, University of Iowa, Iowa City, IA, 52242, USA
| | - Patricia Uguen
- Université Paris-Saclay, INSERM, CNRS, Interactions cellulaires et physiopathologie hépatique, Bât.440, 91405, Orsay, France.
- Present address: Université Paris-Saclay, CNRS, INSERM, Institut Curie, Intégrité du Génome, ARN et cancer, Bât. 110, 91401, Orsay cedex, France.
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Cho DG, Lee SS, Cho KO. Anastral Spindle 3/Rotatin Stabilizes Sol narae and Promotes Cell Survival in Drosophila melanogaster. Mol Cells 2021; 44:13-25. [PMID: 33510049 PMCID: PMC7854181 DOI: 10.14348/molcells.2020.0244] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2020] [Accepted: 12/16/2020] [Indexed: 11/27/2022] Open
Abstract
Apoptosis and compensatory proliferation, two intertwined cellular processes essential for both development and adult homeostasis, are often initiated by the mis-regulation of centrosomal proteins, damaged DNA, and defects in mitosis. Fly Anastral spindle 3 (Ana3) is a member of the pericentriolar matrix proteins and known as a key component of centriolar cohesion and basal body formation. We report here that ana3m19 is a suppressor of lethality induced by the overexpression of Sol narae (Sona), a metalloprotease in a disintegrin and metalloprotease with thrombospondin motif (ADAMTS) family. ana3m19 has a nonsense mutation that truncates the highly conserved carboxyl terminal region containing multiple Armadillo repeats. Lethality induced by Sona overexpression was completely rescued by knockdown of Ana3, and the small and malformed wing and hinge phenotype induced by the knockdown of Ana3 was also normalized by Sona overexpression, establishing a mutually positive genetic interaction between ana3 and sona. p35 inhibited apoptosis and rescued the small wing and hinge phenotype induced by knockdown of ana3. Furthermore, overexpression of Ana3 increased the survival rate of irradiated flies and reduced the number of dying cells, demonstrating that Ana3 actively promotes cell survival. Knockdown of Ana3 decreased the levels of both intra- and extracellular Sona in wing discs, while overexpression of Ana3 in S2 cells dramatically increased the levels of both cytoplasmic and exosomal Sona due to the stabilization of Sona in the lysosomal degradation pathway. We propose that one of the main functions of Ana3 is to stabilize Sona for cell survival and proliferation.
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Affiliation(s)
- Dong-Gyu Cho
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea
| | - Sang-Soo Lee
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea
- Present address: Center for Bioanalysis, Korea Research Institute of Standard and Science, Daejeon 34113, Korea
| | - Kyung-Ok Cho
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea
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Raj A, Chimata AV, Singh A. Motif 1 Binding Protein suppresses wingless to promote eye fate in Drosophila. Sci Rep 2020; 10:17221. [PMID: 33057115 PMCID: PMC7560846 DOI: 10.1038/s41598-020-73891-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2020] [Accepted: 08/31/2020] [Indexed: 01/19/2023] Open
Abstract
The phenomenon of RNA polymerase II (Pol II) pausing at transcription start site (TSS) is one of the key rate-limiting steps in regulating genome-wide gene expression. In Drosophila embryo, Pol II pausing is known to regulate the developmental control genes expression, however, the functional implication of Pol II pausing during later developmental time windows remains largely unknown. A highly conserved zinc finger transcription factor, Motif 1 Binding Protein (M1BP), is known to orchestrate promoter-proximal pausing. We found a new role of M1BP in regulating Drosophila eye development. Downregulation of M1BP function suppresses eye fate resulting in a reduced eye or a "no-eye" phenotype. The eye suppression function of M1BP has no domain constraint in the developing eye. Downregulation of M1BP results in more than two-fold induction of wingless (wg) gene expression along with robust induction of Homothorax (Hth), a negative regulator of eye fate. The loss-of-eye phenotype of M1BP downregulation is dependent on Wg upregulation as downregulation of both M1BP and wg, by using wgRNAi, shows a significant rescue of a reduced eye or a "no-eye" phenotype, which is accompanied by normalizing of wg and hth expression levels in the eye imaginal disc. Ectopic induction of Wg is known to trigger developmental cell death. We found that upregulation of wg as a result of downregulation of M1BP also induces apoptotic cell death, which can be significantly restored by blocking caspase-mediated cell death. Our data strongly imply that transcriptional regulation of wg by Pol II pausing factor M1BP may be one of the important regulatory mechanism(s) during Drosophila eye development.
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Affiliation(s)
- Akanksha Raj
- Department of Biology, University of Dayton, Dayton, OH, 45469, USA
| | | | - Amit Singh
- Department of Biology, University of Dayton, Dayton, OH, 45469, USA. .,Premedical Program, University of Dayton, Dayton, OH, USA. .,Center for Tissue Regeneration and Engineering (TREND), University of Dayton, Dayton, OH, USA. .,Integrative Science and Engineering (ISE), University of Dayton, Dayton, OH, USA. .,Center for Genomic Advocacy (TCGA), Indiana State University, Terre Haute, IN, USA.
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Abstract
Hexim1 acts as a tumor suppressor and is involved in the regulation of innate immunity. It was initially described as a non-coding RNA-dependent regulator of transcription. Here, we detail how 7SK RNA binds to Hexim1 and turns it into an inhibitor of the positive transcription elongation factor (P-TEFb). In addition to its action on P-TEFb, it plays a role in a variety of different mechanisms: it controls the stability of transcription factor components and assists binding of transcription factors to their targets.
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Affiliation(s)
- Annemieke A Michels
- a IBENS , Ecole Normale Supérieure UMR CNRS 8107, UA INSERM 1024 , 46 rue d'Ulm Paris Cedex France
| | - Olivier Bensaude
- a IBENS , Ecole Normale Supérieure UMR CNRS 8107, UA INSERM 1024 , 46 rue d'Ulm Paris Cedex France
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