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  1. Article ; Online: The Interlocking Lives of LARP7: Fine-Tuning Transcription, RNA Modification, and Splicing through Multiple Non-coding RNAs.

    Frilander, Mikko J / Barborič, Matjaž

    Molecular cell

    2020  Volume 78, Issue 1, Page(s) 5–8

    Abstract: Elegant studies by Hasler et al. (2020) and Wang et al. (2020) uncover a novel role of LARP7 in facilitating the 2'-O-methylation of the spliceosomal U6 snRNA, which is functionally required for fidelity of pre-mRNA splicing and development of male germ ... ...

    Abstract Elegant studies by Hasler et al. (2020) and Wang et al. (2020) uncover a novel role of LARP7 in facilitating the 2'-O-methylation of the spliceosomal U6 snRNA, which is functionally required for fidelity of pre-mRNA splicing and development of male germ cells.
    MeSH term(s) Animals ; Base Sequence ; Male ; Mice ; Nucleic Acid Conformation ; RNA Splicing ; RNA, Small Nuclear ; Spermatogenesis
    Chemical Substances RNA, Small Nuclear ; U6 small nuclear RNA
    Language English
    Publishing date 2020-04-03
    Publishing country United States
    Document type Journal Article ; Comment
    ZDB-ID 1415236-8
    ISSN 1097-4164 ; 1097-2765
    ISSN (online) 1097-4164
    ISSN 1097-2765
    DOI 10.1016/j.molcel.2020.03.015
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Inhibition of CDK12 elevates cancer cell dependence on P-TEFb by stimulation of RNA polymerase II pause release.

    Wang, Zhijia / Himanen, Samu V / Haikala, Heidi M / Friedel, Caroline C / Vihervaara, Anniina / Barborič, Matjaž

    Nucleic acids research

    2023  Volume 51, Issue 20, Page(s) 10970–10991

    Abstract: P-TEFb and CDK12 facilitate transcriptional elongation by RNA polymerase II. Given the prominence of both kinases in cancer, gaining a better understanding of their interplay could inform the design of novel anti-cancer strategies. While down-regulation ... ...

    Abstract P-TEFb and CDK12 facilitate transcriptional elongation by RNA polymerase II. Given the prominence of both kinases in cancer, gaining a better understanding of their interplay could inform the design of novel anti-cancer strategies. While down-regulation of DNA repair genes in CDK12-targeted cancer cells is being explored therapeutically, little is known about mechanisms and significance of transcriptional induction upon inhibition of CDK12. We show that selective targeting of CDK12 in colon cancer-derived cells activates P-TEFb via its release from the inhibitory 7SK snRNP. In turn, P-TEFb stimulates Pol II pause release at thousands of genes, most of which become newly dependent on P-TEFb. Amongst the induced genes are those stimulated by hallmark pathways in cancer, including p53 and NF-κB. Consequently, CDK12-inhibited cancer cells exhibit hypersensitivity to inhibitors of P-TEFb. While blocking P-TEFb triggers their apoptosis in a p53-dependent manner, it impedes cell proliferation irrespective of p53 by preventing induction of genes downstream of the DNA damage-induced NF-κB signaling. In summary, stimulation of Pol II pause release at the signal-responsive genes underlies the functional dependence of CDK12-inhibited cancer cells on P-TEFb. Our study establishes the mechanistic underpinning for combinatorial targeting of CDK12 with either P-TEFb or the induced oncogenic pathways in cancer.
    MeSH term(s) Neoplasms/genetics ; NF-kappa B/genetics ; NF-kappa B/metabolism ; Positive Transcriptional Elongation Factor B/genetics ; Positive Transcriptional Elongation Factor B/metabolism ; Ribonucleoproteins, Small Nuclear/genetics ; RNA Polymerase II/genetics ; RNA Polymerase II/metabolism ; RNA-Binding Proteins/metabolism ; Tumor Suppressor Protein p53/genetics ; Humans ; Cell Line, Tumor
    Chemical Substances NF-kappa B ; Positive Transcriptional Elongation Factor B (EC 2.7.11.-) ; Ribonucleoproteins, Small Nuclear ; RNA Polymerase II (EC 2.7.7.-) ; RNA-Binding Proteins ; Tumor Suppressor Protein p53
    Language English
    Publishing date 2023-10-09
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 186809-3
    ISSN 1362-4962 ; 1362-4954 ; 0301-5610 ; 0305-1048
    ISSN (online) 1362-4962 ; 1362-4954
    ISSN 0301-5610 ; 0305-1048
    DOI 10.1093/nar/gkad792
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: P-TEFb promotes cell survival upon p53 activation by suppressing intrinsic apoptosis pathway.

    Wang, Zhijia / Mačáková, Monika / Bugai, Andrii / Kuznetsov, Sergey G / Hassinen, Antti / Lenasi, Tina / Potdar, Swapnil / Friedel, Caroline C / Barborič, Matjaž

    Nucleic acids research

    2023  Volume 51, Issue 4, Page(s) 1687–1706

    Abstract: Positive transcription elongation factor b (P-TEFb) is the crucial player in RNA polymerase II (Pol II) pause release that has emerged as a promising target in cancer. Because single-agent therapy may fail to deliver durable clinical response, targeting ... ...

    Abstract Positive transcription elongation factor b (P-TEFb) is the crucial player in RNA polymerase II (Pol II) pause release that has emerged as a promising target in cancer. Because single-agent therapy may fail to deliver durable clinical response, targeting of P-TEFb shall benefit when deployed as a combination therapy. We screened a comprehensive oncology library and identified clinically relevant antimetabolites and Mouse double minute 2 homolog (MDM2) inhibitors as top compounds eliciting p53-dependent death of colorectal cancer cells in synergy with selective inhibitors of P-TEFb. While the targeting of P-TEFb augments apoptosis by anti-metabolite 5-fluorouracil, it switches the fate of cancer cells by the non-genotoxic MDM2 inhibitor Nutlin-3a from cell-cycle arrest to apoptosis. Mechanistically, the fate switching is enabled by the induction of p53-dependent pro-apoptotic genes and repression of P-TEFb-dependent pro-survival genes of the PI3K-AKT signaling cascade, which stimulates caspase 9 and intrinsic apoptosis pathway in BAX/BAK-dependent manner. Finally, combination treatments trigger apoptosis of cancer cell spheroids. Together, co-targeting of P-TEFb and suppressors of intrinsic apoptosis could become a viable strategy to eliminate cancer cells.
    MeSH term(s) Apoptosis ; Cell Line, Tumor ; Cell Survival ; Phosphatidylinositol 3-Kinases/metabolism ; Positive Transcriptional Elongation Factor B/antagonists & inhibitors ; Positive Transcriptional Elongation Factor B/metabolism ; Proto-Oncogene Proteins c-mdm2/genetics ; Tumor Suppressor Protein p53/genetics ; Humans
    Chemical Substances Phosphatidylinositol 3-Kinases (EC 2.7.1.-) ; Positive Transcriptional Elongation Factor B (EC 2.7.11.-) ; Proto-Oncogene Proteins c-mdm2 (EC 2.3.2.27) ; Tumor Suppressor Protein p53 ; MDM2 protein, human (EC 2.3.2.27)
    Language English
    Publishing date 2023-02-01
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 186809-3
    ISSN 1362-4962 ; 1362-4954 ; 0301-5610 ; 0305-1048
    ISSN (online) 1362-4962 ; 1362-4954
    ISSN 0301-5610 ; 0305-1048
    DOI 10.1093/nar/gkad001
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: The two sides of Tat.

    Barboric, Matjaz / Fujinaga, Koh

    eLife

    2016  Volume 5, Page(s) e12686

    Abstract: A virus protein called Tat plays a dual role in HIV infection by regulating the expression of genes belonging to the virus and genes belonging to the host cells. ...

    Abstract A virus protein called Tat plays a dual role in HIV infection by regulating the expression of genes belonging to the virus and genes belonging to the host cells.
    MeSH term(s) HIV/physiology ; HIV Infections/virology ; Host-Pathogen Interactions ; Humans ; Transcription, Genetic ; Virus Replication ; tat Gene Products, Human Immunodeficiency Virus/metabolism
    Chemical Substances tat Gene Products, Human Immunodeficiency Virus
    Language English
    Publishing date 2016-01-19
    Publishing country England
    Document type Journal Article
    ZDB-ID 2687154-3
    ISSN 2050-084X ; 2050-084X
    ISSN (online) 2050-084X
    ISSN 2050-084X
    DOI 10.7554/eLife.12686
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Mutual relationships between transcription and pre-mRNA processing in the synthesis of mRNA.

    Lenasi, Tina / Barboric, Matjaz

    Wiley interdisciplinary reviews. RNA

    2013  Volume 4, Issue 2, Page(s) 139–154

    Abstract: The generation of messenger RNA (mRNA) in eukaryotes is achieved by transcription from the DNA template and pre-mRNA processing reactions of capping, splicing, and polyadenylation. Although RNA polymerase II (RNAPII) catalyzes the synthesis of pre-mRNA, ... ...

    Abstract The generation of messenger RNA (mRNA) in eukaryotes is achieved by transcription from the DNA template and pre-mRNA processing reactions of capping, splicing, and polyadenylation. Although RNA polymerase II (RNAPII) catalyzes the synthesis of pre-mRNA, it also serves as a principal coordinator of the processing reactions in the course of transcription. In this review, we focus on the interplay between transcription and cotranscriptional pre-mRNA maturation events, mediated by the recruitment of RNA processing factors to differentially phosphorylated C-terminal domain of Rbp1, the largest subunit of RNAPII. Furthermore, we highlight the bidirectional nature of the interplay by discussing the impact of RNAPII kinetics on pre-mRNA processing as well as how the processing events reach back to different phases of gene transcription.
    MeSH term(s) Animals ; Humans ; RNA Precursors/genetics ; RNA Precursors/metabolism ; RNA Processing, Post-Transcriptional ; RNA, Messenger/genetics ; RNA, Messenger/metabolism ; Transcription, Genetic
    Chemical Substances RNA Precursors ; RNA, Messenger
    Language English
    Publishing date 2013-03
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 2634714-3
    ISSN 1757-7012 ; 1757-7004
    ISSN (online) 1757-7012
    ISSN 1757-7004
    DOI 10.1002/wrna.1148
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Cracking the control of RNA polymerase II elongation by 7SK snRNP and P-TEFb.

    C Quaresma, Alexandre J / Bugai, Andrii / Barboric, Matjaz

    Nucleic acids research

    2016  Volume 44, Issue 16, Page(s) 7527–7539

    Abstract: Release of RNA polymerase II (Pol II) from promoter-proximal pausing has emerged as a critical step regulating gene expression in multicellular organisms. The transition of Pol II into productive elongation requires the kinase activity of positive ... ...

    Abstract Release of RNA polymerase II (Pol II) from promoter-proximal pausing has emerged as a critical step regulating gene expression in multicellular organisms. The transition of Pol II into productive elongation requires the kinase activity of positive transcription elongation factor b (P-TEFb), which is itself under a stringent control by the inhibitory 7SK small nuclear ribonucleoprotein (7SK snRNP) complex. Here, we provide an overview on stimulating Pol II pause release by P-TEFb and on sequestering P-TEFb into 7SK snRNP. Furthermore, we highlight mechanisms that govern anchoring of 7SK snRNP to chromatin as well as means that release P-TEFb from the inhibitory complex, and propose a unifying model of P-TEFb activation on chromatin. Collectively, these studies shine a spotlight on the central role of RNA binding proteins (RBPs) in directing the inhibition and activation of P-TEFb, providing a compelling paradigm for controlling Pol II transcription with a non-coding RNA.
    MeSH term(s) Animals ; Chromatin/metabolism ; Humans ; Models, Biological ; Positive Transcriptional Elongation Factor B/metabolism ; RNA Polymerase II/metabolism ; Ribonucleoproteins, Small Nuclear/metabolism ; Transcription Elongation, Genetic
    Chemical Substances Chromatin ; Ribonucleoproteins, Small Nuclear ; Positive Transcriptional Elongation Factor B (EC 2.7.11.-) ; RNA Polymerase II (EC 2.7.7.-)
    Language English
    Publishing date 2016-09-19
    Publishing country England
    Document type Journal Article ; Review
    ZDB-ID 186809-3
    ISSN 1362-4962 ; 1362-4954 ; 0301-5610 ; 0305-1048
    ISSN (online) 1362-4962 ; 1362-4954
    ISSN 0301-5610 ; 0305-1048
    DOI 10.1093/nar/gkw585
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: P-TEFb stimulates transcription elongation and pre-mRNA splicing through multilateral mechanisms.

    Lenasi, Tina / Barboric, Matjaz

    RNA biology

    2010  Volume 7, Issue 2, Page(s) 145–150

    Abstract: Promoter-proximal pausing of RNA polymerase II (RNAPII) across the genome has renewed our attention to the early transcriptional events that control the establishment of pausing and the release of RNAPII into a productive transcription elongation. Here, ... ...

    Abstract Promoter-proximal pausing of RNA polymerase II (RNAPII) across the genome has renewed our attention to the early transcriptional events that control the establishment of pausing and the release of RNAPII into a productive transcription elongation. Here, we review our current understanding of the transcriptional cycle by RNAPII with a particular emphasis on the mechanisms that stimulate transcription elongation and cotranscriptional pre-mRNA splicing through an essential transcriptional kinase, the positive transcription elongation factor b (P-TEFb). We illustrate that by targeting a limited set of transcription elongation factors and paused RNAPII molecule during a promoter-proximal phase of transcription, P-TEFb unleashes an extensive crosstalk between transcription apparatus, RNA processing factors and chromatin for optimal production of mRNA.
    MeSH term(s) Animals ; Positive Transcriptional Elongation Factor B/metabolism ; RNA Polymerase II/chemistry ; RNA Polymerase II/metabolism ; RNA Precursors/genetics ; RNA Splicing/genetics ; Ribonucleoproteins, Small Nuclear/metabolism ; Transcription, Genetic
    Chemical Substances RNA Precursors ; Ribonucleoproteins, Small Nuclear ; Positive Transcriptional Elongation Factor B (EC 2.7.11.-) ; RNA Polymerase II (EC 2.7.7.-)
    Language English
    Publishing date 2010-03-29
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Review
    ISSN 1555-8584
    ISSN (online) 1555-8584
    DOI 10.4161/rna.7.2.11057
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Kick-sTARting HIV-1 transcription elongation by 7SK snRNP deporTATion.

    Barboric, Matjaz / Lenasi, Tina

    Nature structural & molecular biology

    2010  Volume 17, Issue 8, Page(s) 928–930

    Abstract: The HIV-1 Tat protein promotes viral transcription elongation by recruiting P-TEFb to RNA element TAR on the viral mRNA. Recent work from D'Orso and Frankel uncovers unexpected aspects of this process. ...

    Abstract The HIV-1 Tat protein promotes viral transcription elongation by recruiting P-TEFb to RNA element TAR on the viral mRNA. Recent work from D'Orso and Frankel uncovers unexpected aspects of this process.
    MeSH term(s) Gene Expression Regulation, Viral ; HIV Long Terminal Repeat/genetics ; HIV-1/genetics ; Models, Genetic ; Positive Transcriptional Elongation Factor B/metabolism ; RNA Polymerase II/metabolism ; Ribonucleoproteins, Small Nuclear/metabolism ; Transcription, Genetic ; Transcriptional Activation/genetics ; tat Gene Products, Human Immunodeficiency Virus/genetics ; tat Gene Products, Human Immunodeficiency Virus/metabolism
    Chemical Substances Ribonucleoproteins, Small Nuclear ; tat Gene Products, Human Immunodeficiency Virus ; Positive Transcriptional Elongation Factor B (EC 2.7.11.-) ; RNA Polymerase II (EC 2.7.7.-)
    Language English
    Publishing date 2010-08-04
    Publishing country United States
    Document type Comment ; News
    ZDB-ID 2126708-X
    ISSN 1545-9985 ; 1545-9993
    ISSN (online) 1545-9985
    ISSN 1545-9993
    DOI 10.1038/nsmb0810-928
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  9. Article: P-TEFb stimulates transcription elongation and pre-mRNA splicing through multilateral mechanisms

    Lenasi, Tina / Barboric, Matjaz

    RNA biology. 2010 Mar. 1, v. 7, no. 2

    2010  

    Abstract: Promoter-proximal pausing of RNA polymerase II (RNAPII) across the genome has renewed our attention to the early transcriptional events that control the establishment of pausing and the release of RNAPII into a productive transcription elongation. Here, ... ...

    Abstract Promoter-proximal pausing of RNA polymerase II (RNAPII) across the genome has renewed our attention to the early transcriptional events that control the establishment of pausing and the release of RNAPII into a productive transcription elongation. Here, we review our current understanding of the transcriptional cycle by RNAPII with a particular emphasis on the mechanisms that stimulate transcription elongation and cotranscriptional pre-mRNA splicing through an essential transcriptional kinase, the positive transcription elongation factor b (P-TEFb). We illustrate that by targeting a limited set of transcription elongation factors and paused RNAPII molecule during an early phase of transcription, P-TEFb unleashes an extensive crosstalk between transcription apparatus, RNA processing factors and chromatin for optimal production of mRNA.
    Keywords DNA-directed RNA polymerase ; chromatin ; genome ; transcription (genetics) ; transcriptional elongation factors
    Language English
    Dates of publication 2010-0301
    Size p. 145-150.
    Publishing place Taylor & Francis
    Document type Article
    ISSN 1555-8584
    DOI 10.4161/rna.7.2.11057
    Database NAL-Catalogue (AGRICOLA)

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  10. Article ; Online: Cap-binding protein complex links pre-mRNA capping to transcription elongation and alternative splicing through positive transcription elongation factor b (P-TEFb).

    Lenasi, Tina / Peterlin, B Matija / Barboric, Matjaz

    The Journal of biological chemistry

    2011  Volume 286, Issue 26, Page(s) 22758–22768

    Abstract: Promoter-proximal pausing of RNAPII coincides with the formation of the cap structure at the 5' end of pre-mRNA, which is bound by the cap-binding protein complex (CBC). Although the positive transcription elongation factor b (P-TEFb) stimulates the ... ...

    Abstract Promoter-proximal pausing of RNAPII coincides with the formation of the cap structure at the 5' end of pre-mRNA, which is bound by the cap-binding protein complex (CBC). Although the positive transcription elongation factor b (P-TEFb) stimulates the release of RNAPII from pausing and promotes transcription elongation and alternative splicing by phosphorylating the RNAPII C-terminal domain at Ser2 (S2-P RNAPII), it is unknown whether CBC facilitates these events. In this study, we report that CBC interacts with P-TEFb and transcriptionally engaged RNAPII and is globally required for optimal levels of S2-P RNAPII. Quantitative nascent RNA immunoprecipitation and ChIP experiments reveal that depletion of CBC attenuates HIV-1 Tat transactivation and impedes transcription elongation of investigated CBC-dependent endogenous genes by decreasing the levels of P-TEFb and S2-P RNAPII, leading to accumulation of RNAPII in the body of these genes. Finally, CBC is essential for the promotion of alternative splicing through facilitating P-TEFb, S2-P RNAPII, and splicing factor 2/alternative splicing factor occupancy at a splicing minigene. These findings disclose a vital role of CBC in connecting pre-mRNA capping to transcription elongation and alternative splicing via P-TEFb.
    MeSH term(s) Alternative Splicing/physiology ; HeLa Cells ; Humans ; Positive Transcriptional Elongation Factor B/genetics ; Positive Transcriptional Elongation Factor B/metabolism ; RNA Cap-Binding Proteins/genetics ; RNA Cap-Binding Proteins/metabolism ; RNA Polymerase II/genetics ; RNA Polymerase II/metabolism ; RNA Precursors/biosynthesis ; RNA Precursors/genetics ; Transcription, Genetic/physiology
    Chemical Substances RNA Cap-Binding Proteins ; RNA Precursors ; Positive Transcriptional Elongation Factor B (EC 2.7.11.-) ; RNA Polymerase II (EC 2.7.7.-)
    Language English
    Publishing date 2011-05-02
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 2997-x
    ISSN 1083-351X ; 0021-9258
    ISSN (online) 1083-351X
    ISSN 0021-9258
    DOI 10.1074/jbc.M111.235077
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