Table 1. a Selection of Eukaryotic Genes with a Role in the Maintenance of Genome Integrity
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DNA Topoisomerases and Cancer Topoisomerases and TOP Genes in Humans Humans Vs
DNA Topoisomerases Review DNA Topoisomerases And Cancer Topoisomerases and TOP Genes in Humans Humans vs. Escherichia Coli Topoisomerase differences Comparisons Topoisomerase and genomes Top 1 Top1 and Top2 differences Relaxation of DNA Top1 DNA supercoiling DNA supercoiling In the context of chromatin, where the rotation of DNA is constrained, DNA supercoiling (over- and under-twisting and writhe) is readily generated. TOP1 and TOP1mt remove supercoiling by DNA untwisting, acting as “swivelases”, whereas TOP2a and TOP2b remove writhe, acting as “writhases” at DNA crossovers (see TOP2 section). Here are some basic facts concerning DNA supercoiling that are relevant to topoisomerase activity: • Positive supercoiling (Sc+) tightens the DNA helix whereas negative supercoiling (Sc-) facilitates the opening of the duplex and the generation of single-stranded segments. • Nucleosome formation and disassembly absorbs and releases Sc-, respectively. • Polymerases generate Sc+ ahead and Sc- behind their tracks. • Excess of Sc+ arrests DNA tracking enzymes (helicases and polymerases), suppresses transcription elongation and initiation, and destabilizes nucleosomes. • Sc- facilitates DNA melting during the initiation of replication and transcription, D-loop formation and homologous recombination and nucleosome formation. • Excess of Sc- favors the formation of alternative DNA structures (R-loops, guanine quadruplexes, right-handed DNA (Z-DNA), plectonemic structures), which then absorb Sc- upon their formation and attract regulatory proteins. The -
Regulation of Oxidized Base Damage Repair by Chromatin Assembly Factor 1 Subunit a Chunying Yang1,*,†, Shiladitya Sengupta1,2,*,†, Pavana M
Published online 27 October 2016 Nucleic Acids Research, 2017, Vol. 45, No. 2 739–748 doi: 10.1093/nar/gkw1024 Regulation of oxidized base damage repair by chromatin assembly factor 1 subunit A Chunying Yang1,*,†, Shiladitya Sengupta1,2,*,†, Pavana M. Hegde1,JoyMitra1, Shuai Jiang3, Brooke Holey3, Altaf H. Sarker3, Miaw-Sheue Tsai3, Muralidhar L. Hegde1,2,4 and Sankar Mitra1,2,* 1Department of Radiation Oncology, Houston Methodist Research Institute, Houston, TX 77030, USA, 2Weill Cornell Medical College, Cornell University, New York, NY 10065, USA, 3Biological Systems and Engineering Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA and 4Houston Methodist Neurological Institute, Houston, TX 77030, USA Received March 23, 2016; Revised October 13, 2016; Editorial Decision October 17, 2016; Accepted October 19, 2016 ABSTRACT INTRODUCTION Reactive oxygen species (ROS), generated both en- ROS, continuously generated in mammalian cells both en- dogenously and in response to exogenous stress, in- dogenously and by environmental genotoxicants, induce duce point mutations by mis-replication of oxidized various genomic lesions, including oxidized bases, abasic bases and other lesions in the genome. Repair of (AP) sites and single-strand breaks (SSBs). If unrepaired or these lesions via base excision repair (BER) pathway mis-repaired, DNA lesions would cause mutations which may lead to cytotoxicity and cell death and also carcino- maintains genomic fidelity. Regulation of the BER genic transformation (1). The base excision repair (BER) pathway for mutagenic oxidized bases, initiated by pathway, responsible for repair of oxidized base lesions NEIL1 and other DNA glycosylases at the chromatin which contribute to drug/radiation sensitivity is highly con- level remains unexplored. -
Supplementary Data
SUPPLEMENTARY DATA A cyclin D1-dependent transcriptional program predicts clinical outcome in mantle cell lymphoma Santiago Demajo et al. 1 SUPPLEMENTARY DATA INDEX Supplementary Methods p. 3 Supplementary References p. 8 Supplementary Tables (S1 to S5) p. 9 Supplementary Figures (S1 to S15) p. 17 2 SUPPLEMENTARY METHODS Western blot, immunoprecipitation, and qRT-PCR Western blot (WB) analysis was performed as previously described (1), using cyclin D1 (Santa Cruz Biotechnology, sc-753, RRID:AB_2070433) and tubulin (Sigma-Aldrich, T5168, RRID:AB_477579) antibodies. Co-immunoprecipitation assays were performed as described before (2), using cyclin D1 antibody (Santa Cruz Biotechnology, sc-8396, RRID:AB_627344) or control IgG (Santa Cruz Biotechnology, sc-2025, RRID:AB_737182) followed by protein G- magnetic beads (Invitrogen) incubation and elution with Glycine 100mM pH=2.5. Co-IP experiments were performed within five weeks after cell thawing. Cyclin D1 (Santa Cruz Biotechnology, sc-753), E2F4 (Bethyl, A302-134A, RRID:AB_1720353), FOXM1 (Santa Cruz Biotechnology, sc-502, RRID:AB_631523), and CBP (Santa Cruz Biotechnology, sc-7300, RRID:AB_626817) antibodies were used for WB detection. In figure 1A and supplementary figure S2A, the same blot was probed with cyclin D1 and tubulin antibodies by cutting the membrane. In figure 2H, cyclin D1 and CBP blots correspond to the same membrane while E2F4 and FOXM1 blots correspond to an independent membrane. Image acquisition was performed with ImageQuant LAS 4000 mini (GE Healthcare). Image processing and quantification were performed with Multi Gauge software (Fujifilm). For qRT-PCR analysis, cDNA was generated from 1 µg RNA with qScript cDNA Synthesis kit (Quantabio). qRT–PCR reaction was performed using SYBR green (Roche). -
Type IA Topoisomerases As Targets for Infectious Disease Treatments
microorganisms Review Type IA Topoisomerases as Targets for Infectious Disease Treatments Ahmed Seddek 1,2 , Thirunavukkarasu Annamalai 1 and Yuk-Ching Tse-Dinh 1,2,* 1 Department of Chemistry and Biochemistry, Florida International University, Miami, FL 33199, USA; asedd001@fiu.edu (A.S.); athiruna@fiu.edu (T.A.) 2 Biomolecular Sciences Institute, Florida International University, Miami, FL 33199, USA * Correspondence: ytsedinh@fiu.edu; Tel.: +1-305-348-4956 Abstract: Infectious diseases are one of the main causes of death all over the world, with antimi- crobial resistance presenting a great challenge. New antibiotics need to be developed to provide therapeutic treatment options, requiring novel drug targets to be identified and pursued. DNA topoi- somerases control the topology of DNA via DNA cleavage–rejoining coupled to DNA strand passage. The change in DNA topological features must be controlled in vital processes including DNA repli- cation, transcription, and DNA repair. Type IIA topoisomerases are well established targets for antibiotics. In this review, type IA topoisomerases in bacteria are discussed as potential targets for new antibiotics. In certain bacterial pathogens, topoisomerase I is the only type IA topoisomerase present, which makes it a valuable antibiotic target. This review will summarize recent attempts that have been made to identify inhibitors of bacterial topoisomerase I as potential leads for antibiotics and use of these inhibitors as molecular probes in cellular studies. Crystal structures of inhibitor–enzyme complexes and more in-depth knowledge of their mechanisms of actions will help to establish the structure–activity relationship of potential drug leads and develop potent and selective therapeutics that can aid in combating the drug resistant bacterial infections that threaten public health. -
Histone Chaperone CHAF1A Inhibits Differentiation and Promotes Aggressive Neuroblastoma
Published OnlineFirst December 12, 2013; DOI: 10.1158/0008-5472.CAN-13-1315 Cancer Molecular and Cellular Pathobiology Research Histone Chaperone CHAF1A Inhibits Differentiation and Promotes Aggressive Neuroblastoma Eveline Barbieri1, Katleen De Preter3, Mario Capasso4, Zaowen Chen1, Danielle M. Hsu2, Gian Paolo Tonini5, Steve Lefever3, John Hicks1, Rogier Versteeg7, Andrea Pession6, Frank Speleman3, Eugene S. Kim2, and Jason M. Shohet1 Abstract Neuroblastoma arises from the embryonal neural crest secondary to a block in differentiation. Long-term patient survival correlates inversely with the extent of differentiation, and treatment with retinoic acid or other prodifferentiation agents improves survival modestly. In this study, we show the histone chaperone and epigenetic regulator CHAF1A functions in maintaining the highly dedifferentiated state of this aggressive malignancy. CHAF1A is a subunit of the chromatin modifier chromatin assembly factor 1 and it regulates H3K9 trimethylation of key target genes regulating proliferation, survival, and differentiation. Elevated CHAF1A expression strongly correlated with poor prognosis. Conversely, CHAF1A loss-of-function was sufficient to drive neuronal differentiation in vitro and in vivo. Transcriptome analysis of cells lacking CHAF1A revealed repression of oncogenic signaling pathways and a normalization of glycolytic metabolism. Our findings demonstrate that CHAF1A restricts neural crest differentiation and contributes to the pathogenesis of high-risk neuroblastoma. Cancer Res; 74(3); 1–10. -
Differential Expression Profile Analysis of DNA Damage Repair Genes in CD133+/CD133‑ Colorectal Cancer Cells
ONCOLOGY LETTERS 14: 2359-2368, 2017 Differential expression profile analysis of DNA damage repair genes in CD133+/CD133‑ colorectal cancer cells YUHONG LU1*, XIN ZHOU2*, QINGLIANG ZENG2, DAISHUN LIU3 and CHANGWU YUE3 1College of Basic Medicine, Zunyi Medical University, Zunyi; 2Deparment of Gastroenterological Surgery, Affiliated Hospital of Zunyi Medical University, Zunyi;3 Zunyi Key Laboratory of Genetic Diagnosis and Targeted Drug Therapy, The First People's Hospital of Zunyi, Zunyi, Guizhou 563003, P.R. China Received July 20, 2015; Accepted January 6, 2017 DOI: 10.3892/ol.2017.6415 Abstract. The present study examined differential expression cells. By contrast, 6 genes were downregulated and none levels of DNA damage repair genes in COLO 205 colorectal were upregulated in the CD133+ cells compared with the cancer cells, with the aim of identifying novel biomarkers for COLO 205 cells. These findings suggest that CD133+ cells the molecular diagnosis and treatment of colorectal cancer. may possess the same DNA repair capacity as COLO 205 COLO 205-derived cell spheres were cultured in serum-free cells. Heterogeneity in the expression profile of DNA damage medium supplemented with cell factors, and CD133+/CD133- repair genes was observed in COLO 205 cells, and COLO cells were subsequently sorted using an indirect CD133 205-derived CD133- cells and CD133+ cells may therefore microbead kit. In vitro differentiation and tumorigenicity assays provide a reference for molecular diagnosis, therapeutic target in BABA/c nude mice were performed to determine whether selection and determination of the treatment and prognosis for the CD133+ cells also possessed stem cell characteristics, in colorectal cancer. -
The Genetic Program of Pancreatic Beta-Cell Replication in Vivo
Page 1 of 65 Diabetes The genetic program of pancreatic beta-cell replication in vivo Agnes Klochendler1, Inbal Caspi2, Noa Corem1, Maya Moran3, Oriel Friedlich1, Sharona Elgavish4, Yuval Nevo4, Aharon Helman1, Benjamin Glaser5, Amir Eden3, Shalev Itzkovitz2, Yuval Dor1,* 1Department of Developmental Biology and Cancer Research, The Institute for Medical Research Israel-Canada, The Hebrew University-Hadassah Medical School, Jerusalem 91120, Israel 2Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel. 3Department of Cell and Developmental Biology, The Silberman Institute of Life Sciences, The Hebrew University of Jerusalem, Jerusalem 91904, Israel 4Info-CORE, Bioinformatics Unit of the I-CORE Computation Center, The Hebrew University and Hadassah, The Institute for Medical Research Israel- Canada, The Hebrew University-Hadassah Medical School, Jerusalem 91120, Israel 5Endocrinology and Metabolism Service, Department of Internal Medicine, Hadassah-Hebrew University Medical Center, Jerusalem 91120, Israel *Correspondence: [email protected] Running title: The genetic program of pancreatic β-cell replication 1 Diabetes Publish Ahead of Print, published online March 18, 2016 Diabetes Page 2 of 65 Abstract The molecular program underlying infrequent replication of pancreatic beta- cells remains largely inaccessible. Using transgenic mice expressing GFP in cycling cells we sorted live, replicating beta-cells and determined their transcriptome. Replicating beta-cells upregulate hundreds of proliferation- related genes, along with many novel putative cell cycle components. Strikingly, genes involved in beta-cell functions, namely glucose sensing and insulin secretion were repressed. Further studies using single molecule RNA in situ hybridization revealed that in fact, replicating beta-cells double the amount of RNA for most genes, but this upregulation excludes genes involved in beta-cell function. -
Identification of Gastric Cancer–Related Genes Using a Cdna Microarray Containing Novel Expressed Sequence Tags Expressed in Gastric Cancer Cells
Vol. 11, 473–482, January 15, 2005 Clinical Cancer Research 473 Identification of Gastric Cancer–Related Genes Using a cDNA Microarray Containing Novel Expressed Sequence Tags Expressed in Gastric Cancer Cells Jeong-Min Kim,1,5 Ho-Yong Sohn,4 overexpressed in z68% of tissues and the MT2A gene Sun Young Yoon,1 Jung-Hwa Oh,1 Jin Ok Yang,1 was down-expressed in 72% of the tissues. Western blotting and immunohistochemical analyses for CDC20 and SKB1 Joo Heon Kim,2 Kyu Sang Song,3 Seung-Moo Rho,2 1 1 5 showed overexpression and localization changes of the Hyan Sook Yoo, Yong Sung Kim, Jong-Guk Kim, corresponding protein in human gastric cancer tissues. 1 and Nam-Soon Kim Conclusions: Novel genes that are related to human 1Genome Research Center, Korea Research Institute of Bioscience and gastric cancer were identified using cDNA microarray Biotechnology; 2Department of Pathology, Eulji University School of 3 developed in our laboratory. In particular, CDC20 and Medicine; and Department of Pathology, College of Medicine, MT2A represent a potential biomarker of human gastric Chungnam National University, Daejeon, Korea; 4Department of Food and Nutrition, Andong National University, Andong, Korea; and cancer. These newly identified genes should provide a 5Department of Microbiology, College of Natural Sciences, Kyungpook valuable resource for understanding the molecular mecha- National University, Daegu, Korea nism associated with tumorigenesis of gastric carcinogenesis and for the discovery of potential diagnostic markers of gastric cancer. ABSTRACT Purpose: Gastric cancer is one of the most frequently INTRODUCTION diagnosed malignancies in the world, especially in Korea and Japan. -
Two Closely Related Recq Helicases Have Antagonistic Roles in Homologous Recombination and DNA Repair in Arabidopsis Thaliana
Two closely related RecQ helicases have antagonistic roles in homologous recombination and DNA repair in Arabidopsis thaliana Frank Hartung, Stefanie Suer, and Holger Puchta* Botany II, University Karlsruhe, Kaiserstrasse 12, D-76128 Karlsruhe, Germany Edited by Nina Fedoroff, U.S. Department of State, Washington, DC, and approved October 4, 2007 (received for review June 26, 2007) RecQ helicases are involved in the processing of DNA structures RMI1 protein was characterized in mammals and yeast (10, 18, arising during replication, recombination, and repair throughout all 19). Moreover, in the lower eukaryotes S. cerevisiae and Schizo- kingdoms of life. Mutations of different RecQ homologues are re- saccharomyces pombe deletion of their respective RecQ homo- sponsible for severe human diseases, such as Blooms (BLM) or Werner logue leads to partial suppression of the severe phenotypes (WRN) syndrome. The loss of RecQ function is often accompanied by caused by mutation of the TOP3 gene (14, 20–22). hyperrecombination caused by a lack of crossover suppression. In the Several RecQ helicase mutants are synthetically lethal in a Arabidopsis genome seven different RecQ genes are present. Two of combination with mutations in the endonuclease MUS81 (9, 23, them (AtRECQ4A and 4B) arose because of a recent duplication and 24). This inviability of the double mutants is most probably because are still nearly 70% identical on a protein level. Knockout of these both proteins act in parallel pathways resolving aberrant DNA genes leads to antagonistic phenotypes: the RECQ4A mutant shows structures arising during replication. When both genes are mutated, sensitivity to DNA-damaging agents, enhanced homologous recom- these structures accumulate, leading to cell death (9, 23). -
(12) United States Patent (10) Patent No.: US 8,148,129 B2 Frankel Et Al
US008148129B2 (12) United States Patent (10) Patent No.: US 8,148,129 B2 Frankel et al. (45) Date of Patent: Apr. 3, 2012 (54) GENERATION OF POTENT DOMINANT 6,824,978 B1 1 1/2004 Cox, III et al. NEGATIVE TRANSCRIPTIONAL 6,933,113 B2 8, 2005 Case et al. 6,979,539 B2 12/2005 Cox, III et al. INHIBITORS 7,013,219 B2 3/2006 Case et al. 7,070,934 B2 7/2006 Cox, III et al. (75) Inventors: Alan Frankel, Mill Valley, CA (US); 7,163,824 B2 1/2007 Cox, III et al. Robert Nakamura, San Francisco, CA 7,220,719 B2 5/2007 Case et al. (US); Chandreyee Das, Brookline, MA 7,235,354 B2 6/2007 Case et al. 7,262,054 B2 8/2007 Jamieson et al. (US); Ivan D’Orso, San Francisco, CA 7,273,923 B2 9/2007 Jamieson et al. (US); Jocelyn Grunwell, San Mateo, 2003, OO82552 A1* 5, 2003 Wolffe et al. ..................... 435/6 CA (US) (73) Assignee: The Regents of the University of OTHER PUBLICATIONS California, Oakland, CA (US) Cramer et al., Coupling of Transcription with Alternative Splicing: RNA Pol II Promoters Modulate SF2. ASF and 9G8 Effects on an (*) Notice: Subject to any disclaimer, the term of this Exonic Splicing Enhancer, Molecular Cell, 1999, 4:251-258.* patent is extended or adjusted under 35 Cama-Carvalho et al., Nucleocytoplasmic shuttling of heterodimeric U.S.C. 154(b) by 806 days. splicing factor U2AF, JBC. Published on Dec. 15, 2000 as Manu script M008759200.* (21) Appl. No.: 11/765,592 Rosonina et al., Gene Expression: The Close Coupling of Transcrip tion and Splicing, Current Biology, vol. -
CHAF1A–PCNA Interaction Promotes Cervical Cancer Progression Via the PI3K/AKT/Foxo1 Signaling Pathway
CHAF1A–PCNA interaction promotes cervical cancer progression via the PI3K/AKT/FoxO1 signaling pathway Li Wen Department of Gynecology, the First Aliated Hospital of Chongqing Medical University Yuli Luo Obstetrics and Gynecology, People's Hospital of Hechuan District, Chongqing Municipality Zhaoning Duan Department of Gynecology, the First Aliated Hospital of Chongqing Medical University Xiaoge Li Department of Gynecology, the First Aliated Hospital of Chongqing Medical University Ying Jia ( [email protected] ) Department of Gynecology, the First Aliated Hospital of Chongqing Medical University https://orcid.org/0000-0002-1602-3122 Primary research Keywords: Cervical cancerCHAF1APCNAInteraction Posted Date: April 12th, 2021 DOI: https://doi.org/10.21203/rs.3.rs-390228/v1 License: This work is licensed under a Creative Commons Attribution 4.0 International License. Read Full License Page 1/18 Abstract Background An increasing number of studies demonstrate that histone chaperones play critical roles in tumorigenesis and development. In previous research, we conrmed that CHAF1A was highly expressed in cervical cancer (CC) and was correlated with poor prognosis. However, the biological function and specic mechanism of CHAF1A in the development of CC have not been reported. Methods CHAF1A knockdown in SiHa and HeLa.cells by lentivirus vector is veried by RT-PCR and Western blot analysis.CCK-8, ow cytometry assays, colony formation, cell migration assay and real-time cell analysis assay were performed to determine the cellular function of CHAF1A in CC.Tumor xenograft assay was conducted on nude mice to assess the effect of CHAF1A in vivo. Cell immunouorescence and co- immunoprecipitation were applied to examine the interaction between CHAF1A and PCNA. -
Rare Coding Variants in Five DNA Damage Repair Genes Associate
medRxiv preprint doi: https://doi.org/10.1101/2021.04.18.21255506; this version posted April 20, 2021. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted medRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY 4.0 International license . 1 Rare coding variants in five DNA damage repair genes 2 associate with timing of natural menopause 3 Lucas D. Ward1*, Margaret M. Parker1, Aimee M. Deaton1, Ho-Chou Tu1, Alexander O. Flynn-Carroll1, 4 Gregory Hinkle1, Paul Nioi1 5 6 1. Alnylam Pharmaceuticals, Cambridge, MA 02142, USA. 7 * To whom correspondence should be addressed. Email: [email protected]. 8 9 Abstract 10 The age of menopause is associated with fertility and disease risk, and its genetic control is of great 11 interest. We used whole-exome sequences from 119,992 women in the UK Biobank to test for 12 associations between rare damaging variants and age at natural menopause. Rare damaging variants in 13 three genes significantly associated with menopause: CHEK2 (p = 6.2 x 10-51) and DCLRE1A (p = 1.2 x 14 10-12) with later menopause and TOP3A (p = 8.8 x 10-8) with earlier menopause. Two additional genes 15 were suggestive: RAD54L (p = 2.3 x 10-6) with later menopause and HROB (p = 2.7 x 10-6) with earlier 16 menopause. In a follow-up analysis of repeated questionnaires in women who were initially pre- 17 menopausal, CHEK2, TOP3A, and RAD54L genotype associated with subsequent menopause.