Functional Characterization of Long Non-Coding Rnas Associated with the Epithelial-To-Mesenchymal Transition Julien Jarroux
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P110α and P110β Isoforms of PI3K Are Involved in Protection Against H 2O2 Induced Oxidative Stress in Cancer Cells
Breast Cancer (2019) 26:378–385 https://doi.org/10.1007/s12282-018-0933-x ORIGINAL ARTICLE p110α and p110β isoforms of PI3K are involved in protection against H2O2 induced oxidative stress in cancer cells Paramjeet Singh1,2 · Nasima Bano1,2 · Md Mehedi Hossain1,2 · Rafia Basit1,2 · Mohd Jamal Dar1,2 Received: 17 July 2018 / Accepted: 15 November 2018 / Published online: 29 November 2018 © The Japanese Breast Cancer Society 2018 Abstract Purpose Phosphatidylinositol-3 kinases (PI3Ks) are involved in regulating cell growth, proliferation, differentiation, apop- tosis and survival. p110α and p110β, two ubiquitously expressed isoforms of PI3K signalling, are involved in growth factor mediated signaling and survival by generating second messengers. Earlier, we have generated GFP-fusion proteins of p110α and p110β and expressed them in normal and cancer cell-lines to investigate their subcellular localization and their role in various activities. Here, we sought to examine the role of p110α and p110β isoforms in protecting MCF-7 breast cancer cells against oxidative stress. Material methods We performed cytotoxicity assays, DNA transfection, Plasmid DNA preparation, western blotting, flour- scence microscopy and statistical analysis. Results To know whether p110α and p110β are involved in protecting MCF-7 breast cancer cells against oxidative stress, we subjected MCF-7 cells to H2O2 treatment and observed a dose dependent decrease in cell viability and a marked increase in the levels of pro-apoptotic markers which include PARP, Bcl-2, Bax and procaspase-9. We then over-expressed recombinant GFP-fusion p110α and p110β proteins in MCF-7 cells and observed a significant decrease in apoptosis and a concomitant increase in pAkt levels. -
Functional Classification of Long Non-Coding Rnas by K-Mer Content
ARTICLES https://doi.org/10.1038/s41588-018-0207-8 Functional classification of long non-coding RNAs by k-mer content Jessime M. Kirk1,2, Susan O. Kim1,8, Kaoru Inoue1,8, Matthew J. Smola3,9, David M. Lee1,4, Megan D. Schertzer1,4, Joshua S. Wooten1,4, Allison R. Baker" "1,10, Daniel Sprague1,5, David W. Collins6, Christopher R. Horning6, Shuo Wang6, Qidi Chen6, Kevin M. Weeks" "3, Peter J. Mucha7 and J. Mauro Calabrese" "1* The functions of most long non-coding RNAs (lncRNAs) are unknown. In contrast to proteins, lncRNAs with similar functions often lack linear sequence homology; thus, the identification of function in one lncRNA rarely informs the identification of function in others. We developed a sequence comparison method to deconstruct linear sequence relationships in lncRNAs and evaluate similarity based on the abundance of short motifs called k-mers. We found that lncRNAs of related function often had similar k-mer profiles despite lacking linear homology, and that k-mer profiles correlated with protein binding to lncRNAs and with their subcellular localization. Using a novel assay to quantify Xist-like regulatory potential, we directly demonstrated that evolutionarily unrelated lncRNAs can encode similar function through different spatial arrangements of related sequence motifs. K-mer-based classification is a powerful approach to detect recurrent relationships between sequence and function in lncRNAs. he human genome expresses thousands of lncRNAs, several This problem extends to the thousands of lncRNAs that lack char- of which regulate fundamental cellular processes. Still, the acterized functions. Toverwhelming majority of lncRNAs lack characterized func- tion and it is likely that physiologically important lncRNAs remain Results to be identified. -
Nuclear PI3K Signaling in Cell Growth and Tumorigenesis
REVIEW published: 13 April 2015 doi: 10.3389/fcell.2015.00024 Nuclear PI3K signaling in cell growth and tumorigenesis William J. Davis, Peter Z. Lehmann and Weimin Li * College of Medical Sciences, Washington State University, Spokane, WA, USA The PI3K/Akt signaling pathway is a major driving force in a variety of cellular functions. Dysregulation of this pathway has been implicated in many human diseases including cancer. While the activity of the cytoplasmic PI3K/Akt pathway has been extensively studied, the functions of these molecules and their effector proteins within the nucleus are poorly understood. Harboring key cellular processes such as DNA replication and repair as well as nascent messenger RNA transcription, the nucleus provides a unique compartmental environment for protein–protein and protein–DNA/RNA interactions required for cell survival, growth, and proliferation. Here we summarize recent advances made toward elucidating the nuclear PI3K/Akt signaling cascade and its key components within the nucleus as they pertain to cell growth and tumorigenesis. This review covers Edited by: the spatial and temporal localization of the major nuclear kinases having PI3K activities Massimo Mattia Santoro, and the counteracting phosphatases as well as the role of nuclear PI3K/Akt signaling in University of Leuven, Belgium mRNA processing and exportation, DNA replication and repair, ribosome biogenesis, cell Reviewed by: Emilio Hirsch, survival, and tumorigenesis. University of Torino, Italy Keywords: nuclear signaling, PI3K/Akt/mTOR, cell growth, tumorigenesis, ribosome biogenesis, cell survival, DNA Andrea Graziani, damage, mRNA processing and export Università VIta-Salute San Raffaele, Italy *Correspondence: Introduction Weimin Li, College of Medical Sciences, Washington State University, 412 E In the late 1970s and early 1980s, the existence of a nuclear phosphatidylinositol (PtdIns) cycle Spokane Falls Blvd., Spokane 99202 was proposed (Manzoli et al., 1978, 1982). -
Evidence for a Unique DNA-Dependent RNA Polymerase in Cereal Crops
bioRxiv preprint doi: https://doi.org/10.1101/272708; this version posted February 28, 2018. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY-NC-ND 4.0 International license. 1 Evidence for a unique DNA-dependent RNA polymerase in cereal crops 2 Joshua T. Trujillo1, Arun S. Seetharam2, Matthew B. Hufford3, Mark A. Beilstein1,4, and 3 Rebecca A. Mosher1,4,* 4 5 1 Department of Molecular & Cellular Biology, The University of Arizona, Tucson, AZ 6 85721, USA 7 2 Genome Informatics Facility, Iowa State University, Ames, IA 50011, USA 8 3 Department of Ecology, Evolution, and Organismal Biology, Iowa State University, 9 Ames, IA 50011, USA 10 4 The School of Plant Sciences, The University of Arizona, Tucson, AZ 85721, USA 11 12 * Corresponding author: Dr. Rebecca Mosher, 520-626-4185, 13 [email protected] 14 15 ORCiDs: 0000-0001-9817-4161 (JTT), 0000-0002-6789-9298 (ASS), 0000-0001-6379- 16 1899 (MBH), 0000-0002-3392-1389 (MAB), 0000-0003-2195-0825 (RAM) 17 18 Keywords: DNA-dependent RNA polymerase V, RNA-directed DNA methylation, gene 19 duplication, Poaceae 1 bioRxiv preprint doi: https://doi.org/10.1101/272708; this version posted February 28, 2018. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY-NC-ND 4.0 International license. -
Non-Coding Rnas As Regulators of Transcription and Genome Organization Katalin Fejes Toth and Greg Hannon
| 311 13 Non-Coding RNAs as Regulators of Transcription and Genome Organization Katalin Fejes Toth and Greg Hannon 13.1 Introduction “Junk DNA” was used as the provisional label for the portions of a genome for which no discernible function had been identified [1]. In a 1980 review in Nature Leslie Orgel and Francis Crick described junk DNA as having “little specificity and conveying little or no selective advantage to the organism” [2]. For decades, sci- entist considered the non-protein-coding portions of the genome as dispensable. Protein-coding genes comprise an astonishingly small part of eukaryotic genomes (less than 2% in humans, corresponding to roughly 20 000 genes; Chapter 1). However, as less complex eukaryotes, such as Caenorhabditis elegans, have a very similar number of protein-coding genes, it is clear that the developmental and physiological complexity of humans cannot be explained solely by the number of protein-coding genes. Alternative splicing and post-translational modification of proteins increase the diversity and functionality of the proteome likely explaining at least part of its increased complexity. However, it seems evident that much of the regulatory complexity that may contribute to the development of more complex organisms can be established by non-coding RNAs (ncRNAs), as discussed in further detail in Chapter 14. In accord with the notion that much of the genome represents an evolutionary junk heap, many non-coding transcripts have been proposed to result from leaky or pervasive non-specific transcription. Recent high throughput studies indicate that the transcription of our genomes extends far beyond the limited sequences comprising protein-coding genes, with almost the every base in the genome appearing in non-coding RNAs or ncRNAs. -
Downloaded Were Considered to Be True Positive While Those from the from UCSC Databases on 14Th September 2011 [70,71]
Basu et al. BMC Bioinformatics 2013, 14(Suppl 7):S14 http://www.biomedcentral.com/1471-2105/14/S7/S14 RESEARCH Open Access Examples of sequence conservation analyses capture a subset of mouse long non-coding RNAs sharing homology with fish conserved genomic elements Swaraj Basu1, Ferenc Müller2, Remo Sanges1* From Ninth Annual Meeting of the Italian Society of Bioinformatics (BITS) Catania, Sicily. 2-4 May 2012 Abstract Background: Long non-coding RNAs (lncRNA) are a major class of non-coding RNAs. They are involved in diverse intra-cellular mechanisms like molecular scaffolding, splicing and DNA methylation. Through these mechanisms they are reported to play a role in cellular differentiation and development. They show an enriched expression in the brain where they are implicated in maintaining cellular identity, homeostasis, stress responses and plasticity. Low sequence conservation and lack of functional annotations make it difficult to identify homologs of mammalian lncRNAs in other vertebrates. A computational evaluation of the lncRNAs through systematic conservation analyses of both sequences as well as their genomic architecture is required. Results: Our results show that a subset of mouse candidate lncRNAs could be distinguished from random sequences based on their alignment with zebrafish phastCons elements. Using ROC analyses we were able to define a measure to select significantly conserved lncRNAs. Indeed, starting from ~2,800 mouse lncRNAs we could predict that between 4 and 11% present conserved sequence fragments in fish genomes. Gene ontology (GO) enrichment analyses of protein coding genes, proximal to the region of conservation, in both organisms highlighted similar GO classes like regulation of transcription and central nervous system development. -
Sensing the Epigenome
Review Special Issue: Noncoding and small RNAs Sensing the epigenome Jay B. Hollick Department of Plant and Microbial Biology, 111 Koshland Hall, University of California, Berkeley, CA 94720-3102, USA Recent studies of plant development and environmental DRD1 : Arabidopsis gene DEFECTIVE IN RNA-DIRECTED DNA METHYLATION1, stress responses have converged on the roles of RNA encoding a Rad54-type ATPase necessary for RNA-directed DNA methylation. and its metabolism as primary regulators of gene action. En/Spm : a well-characterized autonomous TIR CACTA-type DNA transposon, Enhancer/Suppressor-mutator, described in maize. This RNA-based system appears to represent a versatile FCA : Arabidopsis gene FLOWERING TIME CONTROL PROTEIN, encoding a platform both for maintaining epigenetic memory and RNA-binding protein regulating flower development. FLC : Arabidopsis gene FLOWERING LOCUS C, encoding a MADS-type protein for reprogramming gene control in response to external that acts as a repressor of flowering. signals. The fast-paced research reviewed here high- FLD : Arabidopsis gene FLOWERING LOCUS D, encoding a histone deacetylase lights exciting new trends in plant research relating to that acts to promote flower development. FPA : Arabidopsis gene (At2g43410), encoding a RNA-binding protein regulat- mechanisms and roles of the RNA-dependent epigen- ing flower development. ome in both development and evolution. Imprinted module : a set of neighboring genes showing differential action depending on parent-of-origin transmission. Emerging regulatory roles of RNA lbl1 : maize locus leafbladeless1, expressing a SGS3-type protein required for tasiRNA production. Barbara McClintock was the first to surmise that the LINE : eukaryotic retrotransposon of the long-interspersed nuclear element activation of previously silenced transposons was related class. -
Structural Disorder in Plant Proteins : Where Plasticity Meets Sessility
This is a repository copy of Structural disorder in plant proteins : where plasticity meets sessility. White Rose Research Online URL for this paper: http://eprints.whiterose.ac.uk/152165/ Version: Accepted Version Article: Covarrubias, A.A., Cuevas-Velazquez, C.L., Romero-Pérez, P.S. et al. (2 more authors) (2017) Structural disorder in plant proteins : where plasticity meets sessility. Cellular and Molecular Life Sciences, 74 (17). pp. 3119-3147. ISSN 1420-682X https://doi.org/10.1007/s00018-017-2557-2 This is a post-peer-review, pre-copyedit version of an article published in Cellular and Molecular Life Sciences. The final authenticated version is available online at: http://dx.doi.org/10.1007/s00018-017-2557-2 Reuse Items deposited in White Rose Research Online are protected by copyright, with all rights reserved unless indicated otherwise. They may be downloaded and/or printed for private study, or other acts as permitted by national copyright laws. The publisher or other rights holders may allow further reproduction and re-use of the full text version. This is indicated by the licence information on the White Rose Research Online record for the item. Takedown If you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing [email protected] including the URL of the record and the reason for the withdrawal request. [email protected] https://eprints.whiterose.ac.uk/ 1 2 3 4 5 STRUCTURAL DISORDER IN PLANT PROTEINS: 6 WHERE PLASTICITY MEETS SESSILITY 7 8 Alejandra A. Covarrubias*, Cesar L. -
Polivb Influences RNA-Directed DNA Methylation Independently of Its Role in Sirna Biogenesis
PolIVb influences RNA-directed DNA methylation independently of its role in siRNA biogenesis Rebecca A. Mosher*, Frank Schwach†, David Studholme, and David C. Baulcombe*‡ Sainsbury Laboratory, Norwich NR4 7UH, United Kingdom Edited by James C. Carrington, Center for Genome Research and Biocomputing, Corvallis, OR, and accepted by the Editorial Board December 31, 2007 (received for review October 10, 2007) DNA-dependent RNA polymerase (Pol)IV in Arabidopsis exists in There are two genes in Arabidopsis encoding the putative two isoforms (PolIVa and PolIVb), with NRPD1a and NRPD1b as largest subunit of PolIV (NRPD1A and NRPD1B), and it is likely their respective largest subunits. Both isoforms are implicated in that they share the second largest subunit (NRPD2A) to gen- production and activity of siRNAs and in RNA-directed DNA meth- erate two PolIV isoforms. Mutations in either of the two NRPD1 ylation (RdDM). Deep sequence analysis of siRNAs in WT Arabi- subunits affect siRNA accumulation, although nrpd1b affects dopsis flowers and in nrpd1a and nrpd1b mutants identified siRNA accumulation at only a subset of the loci affected by >4,200 loci producing siRNAs in a PolIV-dependent manner, with nrpd1a (3, 5, 20, 21). This differential effect prompted the PolIVb reinforcing siRNA production by PolIVa. Transposable ele- proposal that PolIVb acts downstream of PolIVa at repeated ment identity and pericentromeric localization are both features sequence loci to amplify siRNA production and methylate DNA, that predispose a locus for siRNA production via PolIV proteins and whereas, at less repetitive loci, PolIVa functions without PolIVb determine the extent to which siRNA production relies on PolIVb. -
Maize RNA Polymerase IV Complexes and Their Control of Gene Function
Maize RNA polymerase IV complexes and their control of gene function by Joy-El Renee Barbour Talbot A dissertation submitted in partial satisfaction of the requirements for the degree of Doctor of Philosophy in Molecular and Cell Biology in the Graduate Division of the University of California, Berkeley Committee in charge: Professor Jay B. Hollick, Co-chair Professor Jasper D. Rine, Co-chair Professor Michael B. Eisen Professor Michael R. Freeling Summer 2015 Maize RNA polymerase IV complexes and their control of gene function Copyright 2015 by Joy-El Renee Barbour Talbot 1 Abstract Maize RNA polymerase IV complexes and their control of gene function by Joy-El Renee Barbour Talbot Doctor of Philosophy in Molecular and Cell Biology University of California, Berkeley Professor Jay B. Hollick, Co-chair Professor Jasper D. Rine, Co-chair Plants have acquired and maintained an expanded suite of DNA-dependent RNA poly- merases (RNAPs) compared to other eukaryotes. Although their exact roles remain unclear, plant-specific RNAPs (Pol IV and Pol V) are involved in epigenetic silencing of transposable elements (TEs). Zea mays (maize) Pol IV is required for proper plant development as well as the establishment and maintenance of paramutations, which are trans-homolog interactions that facilitate heritable gene silencing. Maize has duplications of Pol IV catalytic subunits, which define multiple Pol IV subtypes, and accessory proteins associated with these subtypes define distinct Pol IV complexes. Understanding the roles of Pol IV will require identify- ing the composition and function of these Pol IV subtypes and complexes. In exploring interactions between the genes encoding a Pol IV catalytic subunit and a putative accessory protein, I identified two new alleles of the Pol IV subunit and a family of potential Pol IV accessory proteins conserved in multicellular plants. -
Sbta1301 – Molecular Biology and Genetics
SCHOOL OF BIO AND CHEMICAL ENGINEERING DEPARTMENT OF BIOTECHNOLOGY SBTA1301 – MOLECULAR BIOLOGY AND GENETICS UNIT – I – CLASSICAL GENETICS Mendelian Inheritance Mendelian inheritance is inheritance of biological features that follows the laws proposed by Gregor Johann Mendel in 1865 and 1866 and re-discovered in 1900. It was initially very controversial. When Mendel's theories were integrated with the Boveri–Sutton chromosome theory of inheritance by Thomas Hunt Morgan in 1915, they became the core of classical genetics while Ronald Fishercombined them with the theory of natural selection in his 1930 book The Genetical Theory of Natural Selection, putting evolutiononto a mathematical footing and forming the basis for Population genetics and the modern evolutionary synthesis. History The laws of inheritance were derived by Gregor Mendel, a nineteenth- century Austrian monk conducting hybridization experiments in garden peas (Pisum sativum) he planted in the backyard of the church. Between 1856 and 1863, he cultivated and tested some 5,000 pea plants. From these experiments, he induced two generalizations which later became known as Mendel's Principles of Heredity or Mendelian inheritance. He described these principles in a two-part paper, Versuche über Pflanzen-Hybriden(Experiments on Plant Hybridization), that he read to the Natural History Society of Brno on February 8 and March 8, 1865, and which was published in 1866. Mendel's conclusions were largely ignored. Although they were not completely unknown to biologists of the time, they were not seen as generally applicable, even by Mendel himself, who thought they only applied to certain categories of species or traits. A major block to understanding their significance was the importance attached by 19th-century biologists to the apparent blending of inherited traits in the overall appearance of the progeny, now known to be due to multigene interactions, in contrast to the organ-specific binary characters studied by Mendel. -
Multiple Transcript Initiation As a Mechanism for Regulating Gene Expression
Ch02.qxd 29/01/07 12:01 PM Page 39 2 Multiple Transcript Initiation as a Mechanism for Regulating Gene Expression Robert E. Farrell, Jr. and Carole L. Bassett 2.1. Nuclear Gene Transcription – An Overview Transcription is the intermediary process that copies a DNA-encoded gene into a form which is either functional in its own right (stable RNAs, such as ribosomal or transfer RNAs) or can be decoded by the translational machin- ery into a functional protein. Transcripts destined for translation are called messenger RNAs (mRNAs), since they act as go-betweens from DNA to protein. Although RNAs are transcribed as single-stranded molecules, most can assume complicated secondary and tertiary structures that are critical for proper functioning. As a result, each mRNA contains not only the sequence information required to synthesize a protein, but also structural components that can regulate mRNA localization, stability, and translation efficiency. Thus the initiation of transcription occupies a preeminent place in the regulation of gene expression. Since transcription is compartmentalized within a membrane-bound nucleus in eukaryotic cells, it is both spatially and temporally separated from translation. In both plant and animal cells, the stability of a typical mRNA transcript is significantly greater than that of a prokaryotic transcript which is often being both translated and degraded simultaneously. The enhanced stability of eukaryotic transcripts has facilitated their isolation and manipu- lation using molecular techniques. RNA is produced from different chromosomal loci at different rates. It is obvious that transcript abundance reflects differences in the rate of RNA synthesis, stability of the transcript, and/or differences in the rate of RNA degradation.