Topic
Transcription (biology)
About: Transcription (biology) is a research topic. Over the lifetime, 56532 publications have been published within this topic receiving 2952782 citations. The topic is also known as: genetic transcription & transcription, genetic.
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TL;DR: It is demonstrated that Hif-1 DNA binding activity is also induced by hypoxia in a variety of mammalian cell lines in which the EPO gene is not transcribed, providing evidence that HIF-1 and its recognition sequence are common components of a general mammalian cellular response to Hypoxia.
Abstract: Transcription of the human erythropoietin (EPO) gene is activated in Hep3B cells exposed to hypoxia. Hypoxia-inducible factor 1 (HIF-1) is a nuclear factor whose DNA binding activity is induced by hypoxia in Hep3B cells, and HIF-1 binds at a site in the EPO gene enhancer that is required for hypoxic activation of transcription. In this paper, we demonstrate that HIF-1 DNA binding activity is also induced by hypoxia in a variety of mammalian cell lines in which the EPO gene is not transcribed. The composition of the HIF-1 DNA binding complex and its isolated DNA binding subunit and the mechanism of HIF-1 activation appear to be similar or identical in EPO-producing and non-EPO-producing cells. Transcription of reporter genes containing the EPO gene enhancer is induced by hypoxia in non-EPO-producing cells and mutations that eliminate HIF-1 binding eliminate inducibility. These results provide evidence that HIF-1 and its recognition sequence are common components of a general mammalian cellular response to hypoxia.
1,405 citations
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TL;DR: A method for producing amplified heterogeneous populations of RNA from limited quantities of cDNA and sequences for cyclophilin and guanine nucleotide-binding protein (G-protein) alpha subunits have been detected in aRNA derived from single cerebellar tissue sections.
Abstract: The heterogeneity of neural gene expression and the spatially limited expression of many low-abundance messenger RNAs in the brain has made cloning and analysis of such messages difficult. To generate amounts of nucleic acids sufficient for use in standard cloning strategies, we have devised a method for producing amplified heterogeneous populations of RNA from limited quantities of cDNA. Whole cerebellar RNA was primed with a synthetic oligonucleotide containing the T7 RNA polymerase promoter sequence 5' to a polythymidylate region. After second-strand cDNA synthesis, T7 RNA polymerase was used to generate amplified antisense RNA (aRNA). Up to 80-fold molar amplification has been achieved from nanogram quantities of cDNA. The amplified material is similar in size distribution to the parent cDNA and shows sequence heterogeneity as assessed by Southern and Northern blot analysis. Specific messages for moderate-abundance mRNAs for actin and guanine nucleotide-binding protein (G-protein) alpha subunits have been detected in the amplified material. By using in situ transcription to generate cDNA, sequences for cyclophilin have been detected in aRNA derived from single cerebellar tissue sections. cDNA derived from a single cerebellar Purkinje cell also has been amplified and yields material that hybridizes to cognate whole RNA and mRNA but not to Escherichia coli RNA.
1,388 citations
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TL;DR: It is reported that expression of wild-type but not of mutated SIP1 downregulates mammalian E-cadherin transcription via binding to both conserved E2 boxes of the minimal E- cadheringin promoter.
1,369 citations
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Wellcome Trust Sanger Institute1, Seattle Biomed2, Katholieke Universiteit Leuven3, GATC Biotech4, Max Planck Society5, Washington University in St. Louis6, University of Trieste7, International Centre for Genetic Engineering and Biotechnology8, European Bioinformatics Institute9, University of São Paulo10, National Scientific and Technical Research Council11, Université catholique de Louvain12, University of London13, University of Edinburgh14, University of Glasgow15, University of Wisconsin-Madison16, University of York17, University of Cambridge18, University of Washington19
TL;DR: The organization of protein-coding genes into long, strand-specific, polycistronic clusters and lack of general transcription factors in the L. major, Trypanosoma brucei, and Tritryp genomes suggest that the mechanisms regulating RNA polymerase II–directed transcription are distinct from those operating in other eukaryotes, although the trypanosomatids appear capable of chromatin remodeling.
Abstract: Leishmania species cause a spectrum of human diseases in tropical and subtropical regions of the world. We have sequenced the 36 chromosomes of the 32.8-megabase haploid genome of Leishmania major (Friedlin strain) and predict 911 RNA genes, 39 pseudogenes, and 8272 protein-coding genes, of which 36% can be ascribed a putative function. These include genes involved in host-pathogen interactions, such as proteolytic enzymes, and extensive machinery for synthesis of complex surface glycoconjugates. The organization of protein-coding genes into long, strand-specific, polycistronic clusters and lack of general transcription factors in the L. major, Trypanosoma brucei, and Trypanosoma cruzi (Tritryp) genomes suggest that the mechanisms regulating RNA polymerase II-directed transcription are distinct from those operating in other eukaryotes, although the trypanosomatids appear capable of chromatin remodeling. Abundant RNA-binding proteins are encoded in the Tritryp genomes, consistent with active posttranscriptional regulation of gene expression.
1,357 citations
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TL;DR: This article performed a large-scale small interfering RNA screen to identify host factors required by HIV-1 and identified more than 250 HIV-dependency factors (HDFs), which participate in a broad array of cellular functions and implicate new pathways in the viral life cycle.
Abstract: HIV-1 exploits multiple host proteins during infection. We performed a large-scale small interfering RNA screen to identify host factors required by HIV-1 and identified more than 250 HIV-dependency factors (HDFs). These proteins participate in a broad array of cellular functions and implicate new pathways in the viral life cycle. Further analysis revealed previously unknown roles for retrograde Golgi transport proteins (Rab6 and Vps53) in viral entry, a karyopherin (TNPO3) in viral integration, and the Mediator complex (Med28) in viral transcription. Transcriptional analysis revealed that HDF genes were enriched for high expression in immune cells, suggesting that viruses evolve in host cells that optimally perform the functions required for their life cycle. This effort illustrates the power with which RNA interference and forward genetics can be used to expose the dependencies of human pathogens such as HIV, and in so doing identify potential targets for therapy.
1,348 citations