Human Inheritable Genetic Modifications
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REVIEW Gene Therapy
Leukemia (2001) 15, 523–544 2001 Nature Publishing Group All rights reserved 0887-6924/01 $15.00 www.nature.com/leu REVIEW Gene therapy: principles and applications to hematopoietic cells VFI Van Tendeloo1,2, C Van Broeckhoven2 and ZN Berneman1 1Laboratory of Experimental Hematology, University of Antwerp (UIA), Antwerp University Hospital (UZA), Antwerp; and 2Laboratory of Molecular Genetics, University of Antwerp (UIA), Department of Molecular Genetics, Flanders Interuniversity Institute for Biotechnology (VIB), Antwerp, Belgium Ever since the development of technology allowing the transfer Recombinant viral vectors of new genes into eukaryotic cells, the hematopoietic system has been an obvious and desirable target for gene therapy. The last 10 years have witnessed an explosion of interest in this Biological gene transfer methods make use of modified DNA approach to treat human disease, both inherited and acquired, or RNA viruses to infect the cell, thereby introducing and with the initiation of multiple clinical protocols. All gene ther- expressing its genome which contains the gene of interest (= apy strategies have two essential technical requirements. ‘transduction’).1 The most commonly used viral vectors are These are: (1) the efficient introduction of the relevant genetic discussed below. In each case, recombinant viruses have had material into the target cell and (2) the expression of the trans- gene at therapeutic levels. Conceptual and technical hurdles the genes encoding essential replicative and/or packaging pro- involved with these requirements are still the objects of active teins replaced by the gene of interest. Advantages and disad- research. To date, the most widely used and best understood vantages of each recombinant viral vector are summarized in vectors for gene transfer in hematopoietic cells are derived Table 1. -
Genomic Profiling Reveals High Frequency of DNA Repair Genetic
www.nature.com/scientificreports OPEN Genomic profling reveals high frequency of DNA repair genetic aberrations in gallbladder cancer Reham Abdel‑Wahab1,9, Timothy A. Yap2, Russell Madison4, Shubham Pant1,2, Matthew Cooke4, Kai Wang4,5,7, Haitao Zhao8, Tanios Bekaii‑Saab6, Elif Karatas1, Lawrence N. Kwong3, Funda Meric‑Bernstam2, Mitesh Borad6 & Milind Javle1,10* DNA repair gene aberrations (GAs) occur in several cancers, may be prognostic and are actionable. We investigated the frequency of DNA repair GAs in gallbladder cancer (GBC), association with tumor mutational burden (TMB), microsatellite instability (MSI), programmed cell death protein 1 (PD‑1), and its ligand (PD‑L1) expression. Comprehensive genomic profling (CGP) of 760 GBC was performed. We investigated GAs in 19 DNA repair genes including direct DNA repair genes (ATM, ATR , BRCA1, BRCA2, FANCA, FANCD2, MLH1, MSH2, MSH6, PALB2, POLD1, POLE, PRKDC, and RAD50) and caretaker genes (BAP1, CDK12, MLL3, TP53, and BLM) and classifed patients into 3 groups based on TMB level: low (< 5.5 mutations/Mb), intermediate (5.5–19.5 mutations/Mb), and high (≥ 19.5 mutations/Mb). We assessed MSI status and PD‑1 & PD‑L1 expression. 658 (86.6%) had at least 1 actionable GA. Direct DNA repair gene GAs were identifed in 109 patients (14.2%), while 476 (62.6%) had GAs in caretaker genes. Both direct and caretaker DNA repair GAs were signifcantly associated with high TMB (P = 0.0005 and 0.0001, respectively). Tumor PD‑L1 expression was positive in 119 (15.6%), with 17 (2.2%) being moderate or high. DNA repair GAs are relatively frequent in GBC and associated with coexisting actionable mutations and a high TMB. -
Mitosis Vs. Meiosis
Mitosis vs. Meiosis In order for organisms to continue growing and/or replace cells that are dead or beyond repair, cells must replicate, or make identical copies of themselves. In order to do this and maintain the proper number of chromosomes, the cells of eukaryotes must undergo mitosis to divide up their DNA. The dividing of the DNA ensures that both the “old” cell (parent cell) and the “new” cells (daughter cells) have the same genetic makeup and both will be diploid, or containing the same number of chromosomes as the parent cell. For reproduction of an organism to occur, the original parent cell will undergo Meiosis to create 4 new daughter cells with a slightly different genetic makeup in order to ensure genetic diversity when fertilization occurs. The four daughter cells will be haploid, or containing half the number of chromosomes as the parent cell. The difference between the two processes is that mitosis occurs in non-reproductive cells, or somatic cells, and meiosis occurs in the cells that participate in sexual reproduction, or germ cells. The Somatic Cell Cycle (Mitosis) The somatic cell cycle consists of 3 phases: interphase, m phase, and cytokinesis. 1. Interphase: Interphase is considered the non-dividing phase of the cell cycle. It is not a part of the actual process of mitosis, but it readies the cell for mitosis. It is made up of 3 sub-phases: • G1 Phase: In G1, the cell is growing. In most organisms, the majority of the cell’s life span is spent in G1. • S Phase: In each human somatic cell, there are 23 pairs of chromosomes; one chromosome comes from the mother and one comes from the father. -
Review Cell Fusion and Some Subcellular Properties Of
REVIEW CELL FUSION AND SOME SUBCELLULAR PROPERTIES OF HETEROKARYONS AND HYBRIDS SAIMON GORDON From the Genetics Laboratory, Department of Biochemistry, The University of Oxford, England, and The Rockefeller University, New York 10021 I. INTRODUCTION The technique of somatic cell fusion has made it first cell hybrids obtained by this method. The iso- possible to study cell biology in an unusual and lation of hybrid cells from such mixed cultures direct way. When cells are mixed in the presence of was greatly facilitated by the Szybalski et al. (6) Sendai virus, their membranes coalesce, the cyto- and Littlefield (7, 8) adaptation of a selective me- plasm becomes intermingled, and multinucleated dium containing hypoxanthine, aminopterin, and homo- and heterokaryons are formed by fusion of thymidine (HAT) to mammalian systems. similar or different cells, respectively (1, 2). By Further progress followed the use of Sendai fusing cells which contrast in some important virus by Harris and Watkins to increase the biologic property, it becomes possible to ask ques- frequency of heterokaryon formation (9). These tions about dominance of control processes, nu- authors exploited the observation by Okada that cleocytoplasmic interactions, and complementa- UV irradiation could be used to inactivate Sendai tion in somatic cell heterokaryons. The multinucle- virus without loss of fusion efficiency (10). It was ate cell may divide and give rise to mononuclear therefore possible to eliminate the problem of virus cells containing chromosomes from both parental replication in fused cells. Since many cells carry cells and become established as a hybrid cell line receptors for Sendai virus, including those of able to propagate indefinitely in vitro. -
Gene Therapy Product Quality Aspects in the Production of Vectors and Genetically Modified Somatic Cells
_____________________________________________________________ 3AB6a ■ GENE THERAPY PRODUCT QUALITY ASPECTS IN THE PRODUCTION OF VECTORS AND GENETICALLY MODIFIED SOMATIC CELLS Guideline Title Gene Therapy Product Quality Aspects in the Production of Vectors and Genetically Modified Somatic Cells Legislative basis Directive 75/318/EEC as amended Date of first adoption December 1994 Date of entry into July 1995 force Status Last revised December 1994 Previous titles/other Gene Therapy Products - Quality, Safety and Efficacy references Aspects in the Production of Vectors and Genetically Modified Somatic Cells/ III/5863/93 Additional Notes This note for guidance is intended to facilitate the collection and submission of data to support applications for marketing authorisation within the EC for gene therapy products derived by biotechnology/high technology and intended for medicinal use in man. CONTENTS 1. INTRODUCTION 2. POINTS TO CONSIDER IN MANUFACTURE 3. DEVELOPMENT GENETICS 4. PRODUCTION 5. PURIFICATION 6. PRODUCT CHARACTERISATION 7. CONSISTENCY AND ROUTINE BATCH CONTROL OF FINAL PROCESSED PRODUCT 8. SAFETY REGULATIONS 275 _____________________________________________________________ 3AB6a ■ GENE THERAPY PRODUCT QUALITY ASPECTS IN THE PRODUCTION OF VECTORS AND GENETICALLY MODIFIED SOMATIC CELLS 1. INTRODUCTION Somatic gene therapy encompasses medical interventions which involve the deliberate modification of the genetic material of somatic cells. Scientific progress over the past decade has led to the development of novel methods for the transfer of new genetic material into patients’ cells. The aims of these methods include the efficient transfer and functional expression or manifestation of the transferred genetic material in a target somatic cell population for therapeutic, prophylactic or diagnostic purposes. Although in the majority of cases the intention is the addition and expression of a gene to yield a protein product, the transfer of nucleic acids with the aim of modifying the function or expression of an endogenous gene, e.g. -
Human Germline Genome Editing: Fact Sheet
Human germline genome editing: fact sheet Purpose • To contribute to evidence-informed discussions about human germline genome editing. KEY TAKEAWAYS • Gene editing offers the potential to improve human health in ways not previously possible. • Making changes to human genes that can be passed on to future generations is prohibited in Australia. • Unresolved questions remain on the possible long-term impacts, unintended consequences, and ethical issues associated with introducing heritable changes by editing of the genome of human gametes (sperm and eggs) and embryos. • AusBiotech believes the focus of human gene editing should remain on non-inheritable changes until such time as the scientific evidence, regulatory frameworks and health care models have progressed sufficiently to warrant consideration of any heritable genetic edits. Gene editing Gene editing is the insertion, deletion, or modification of DNA to modify an organism’s specific genetic characteristics. New and evolving gene editing techniques and tools (e.g. CRISPR) allow editing of genes with a level of precision that increases its applications across the health, agricultural, and industrial sectors. These breakthrough techniques potentially offer a range of different options for treating devastating human diseases and delivering environmentally sustainable food production systems that can feed the world’s growing population, which is expected to exceed nine billion by 2050. The current primary application of human gene editing is on non-reproductive cells (‘somatic’ cells) -
Cell Division- Ch 5
Cell Division- Mitosis and Meiosis When do cells divide? Cell size . One of most important factors affecting size of the cell is size of cell membrane . Cell must remain relatively small to survive (why?) – Cell membrane has to be big enough to take in nutrients and eliminate wastes – As cells get bigger, the volume increases faster than the surface area – Small cells have a larger surface area to volume ratio than larger cells to help with nutrient intake and waste elimination . When a cell reaches its max size, the nucleus starts cell division: called MITOSIS or MEIOSIS Mitosis . General Information – Occurs in somatic (body) cells ONLY!! – Nickname: called “normal” cell division – Produces somatic cells only . Background Info – Starts with somatic cell in DIPLOID (2n) state . Cell contains homologous chromosomes- chromosomes that control the same traits but not necessarily in the same way . 1 set from mom and 1 set from dad – Ends in diploid (2n) state as SOMATIC cells – Goes through one set of divisions – Start with 1 cell and end with 2 cells Mitosis (cont.) . Accounts for three essential life processes – Growth . Result of cell producing new cells . Develop specialized shapes/functions in a process called differentiation . Rate of cell division controlled by GH (Growth Hormone) which is produced in the pituitary gland . Ex. Nerve cell, intestinal cell, etc. – Repair . Cell regenerates at the site of injury . Ex. Skin (replaced every 28 days), blood vessels, bone Mitosis (cont.) – Reproduction . Asexual – Offspring produced by only one parent – Produce offspring that are genetically identical – MITOSIS – Ex. Bacteria, fungi, certain plants and animals . -
Gene Delivery & Expression
GENE DELIVERY & EXPRESSION GENE DELIVERY & EXPRESSION LENTIVIRUS, PIGGYBAC, MINICIRCLES, AND MORE SYSTEMBIO.COM SYSTEMS FOR ANY APPLICATION: LENTIVIRAL TOOLS AND MORE In today’s busy labs, getting experiments to work right the first time is critical—not only do you want results you can trust, you want them fast. Which is why SBI has spent over a decade developing a range of exceptionally high-performing products for gene delivery and expression. From our popular high-titer lentivirus production tools to the latest in AAV-based gene delivery systems and a range of reliable integrating and non- integrating gene expression vectors, SBI delivers high-quality, cutting-edge products and services for mammalian gene delivery and expression. With products and services that have been used in thousands of peer-reviewed papers, SBI is your trusted partner for high-quality research. 04 06 12 14 PRODUCT INTEGRATING NON-INTEGRATING SERVICES SELECTOR VECTOR SYSTEMS VECTOR SYSTEMS Syn2Clone Lentiviral Enhanced Episomal Virus Packaging Vectors PiggyBac Cell Line Construction Transposon Minicircle Technology PhiC31 Integrase AAV PinPoint Targeted Integration Non-integrating Lentiviral Gene Knock-out Gene Knock-in Gene Edit AAVS1 Safe Harbor Site INDELS via NHEJ NN OR HR Donor HR Donor Vector Vector HR Donor Vector GENE INSERTION loxP loxP (with HR vector) Excision of GENE KNOCK-OUT selection cassette (with HR vector) CORRECTED GOI PRODUCT SELECTOR A WEALTH OF OPTIONS FOR GENE DELIVERY AND EXPRESSION Integrating Vectors With integrating vectors, the vector DNA becomes permanently incorporated into the genome, often at multiple copy numbers. Depending on the system, integration can be random or directed to a specific locus. -
Exploring the Interplay of Telomerase Reverse Transcriptase and Β-Catenin in Hepatocellular Carcinoma
cancers Review Exploring the Interplay of Telomerase Reverse Transcriptase and β-Catenin in Hepatocellular Carcinoma Srishti Kotiyal and Kimberley Jane Evason * Department of Oncological Sciences, Department of Pathology, and Huntsman Cancer Institute, University of Utah, Salt Lake City, UT 84112, USA; [email protected] * Correspondence: [email protected]; Tel.: +1-801-587-4606 Simple Summary: Liver cancer is one of the deadliest human cancers. Two of the most common molecular aberrations in liver cancer are: (1) activating mutations in the gene encoding β-catenin (CTNNB1); and (2) promoter mutations in telomerase reverse transcriptase (TERT). Here, we review recent findings regarding the interplay between TERT and β-catenin in order to better understand their role in liver cancer. Abstract: Hepatocellular carcinoma (HCC) is one of the deadliest human cancers. Activating muta- tions in the telomerase reverse transcriptase (TERT) promoter (TERTp) and CTNNB1 gene encoding β-catenin are widespread in HCC (~50% and ~30%, respectively). TERTp mutations are predicted to increase TERT transcription and telomerase activity. This review focuses on exploring the role of TERT and β-catenin in HCC and the current findings regarding their interplay. TERT can have contradictory effects on tumorigenesis via both its canonical and non-canonical functions. As a critical regulator of proliferation and differentiation in progenitor and stem cells, activated β-catenin drives HCC; however, inhibiting endogenous β-catenin can also have pro-tumor effects. Clinical studies revealed a significant concordance between TERTp and CTNNB1 mutations in HCC. In Citation: Kotiyal, S.; Evason, K.J. stem cells, TERT acts as a co-factor in β-catenin transcriptional complexes driving the expression Exploring the Interplay of Telomerase of WNT/β-catenin target genes, and β-catenin can bind to the TERTp to drive its transcription. -
Telomere and Telomerase in Oncology
Cell Research (2002); 12(1):1-7 http://www.cell-research.com REVIEW Telomere and telomerase in oncology JIAO MU*, LI XIN WEI International Joint Cancer Institute, Second Military Medical University, Shanghai 200433, China ABSTRACT Shortening of the telomeric DNA at the chromosome ends is presumed to limit the lifespan of human cells and elicit a signal for the onset of cellular senescence. To continually proliferate across the senescent checkpoint, cells must restore and preserve telomere length. This can be achieved by telomerase, which has the reverse transcriptase activity. Telomerase activity is negative in human normal somatic cells but can be detected in most tumor cells. The enzyme is proposed to be an essential factor in cell immortalization and cancer progression. In this review we discuss the structure and function of telomere and telomerase and their roles in cell immortalization and oncogenesis. Simultaneously the experimental studies of telomerase assays for cancer detection and diagnosis are reviewed. Finally, we discuss the potential use of inhibitors of telomerase in anti-cancer therapy. Key words: Telomere, telomerase, cancer, telomerase assay, inhibitor. Telomere and cell replicative senescence base pairs of the end of telomeric DNA with each Telomeres, which are located at the end of round of DNA replication. Hence, the continual chromosome, are crucial to protect chromosome cycles of cell growth and division bring on progress- against degeneration, rearrangment and end to end ing telomere shortening[4]. Now it is clear that te- fusion[1]. Human telomeres are tandemly repeated lomere shortening is responsible for inducing the units of the hexanucleotide TTAGGG. The estimated senescent phenotype that results from repeated cell length of telomeric DNA varies from 2 to 20 kilo division, but the mechanism how a short telomere base pairs, depending on factors such as tissue type induces the senescence is still unknown. -
Bio 103 Lecture
Biology 103 Lecture Mitosis and Meiosis Study Guide (Cellular Basis of Reproduction - Chapter 8) Like begets like, more or less · does sexual reproduction and genetics allow for a maple tree to produce a sea star? · do offspring inherit genetic material from both parents in asexual reproduction? · do offspring inherit genetic material from both parents in sexual reproduction? · what is the name of structures that contain most of an organism's DNA? Cells arise only from preexisting cells · what two main roles does cell division play in perpetuating the life cycle of animals and other multicellular organisms? Prokaryotes reproduce by binary fission · what is the name of the type of cell division used by prokaryotes to reproduce themselves? · do prokaryotes have DNA? · do prokaryotes replicate their chromosome prior to division? · is binary fission considered asexual or sexual reproduction and why? The large, complex chromosomes of eukaryotes duplicate with each cell division · in what structure of the eukaryotic cell do most of the genes occur? · what are genes and where are they located? · what is chromatin and how is it different from chromosomes? · understand chromosome duplication and distribution The cell cycle multiplies cells · define cell cycle · what are the major components of the cell cycle? · in what phase of the cell cycle does the cell spend the most time? · what occurs during cytokinesis? Cell division is a continuum of dynamic changes · know that the main things that occur during the four stages of mitosis are formation -
Delivery Strategies of the CRISPR-Cas9 Gene-Editing System for Therapeutic MARK Applications
Journal of Controlled Release 266 (2017) 17–26 Contents lists available at ScienceDirect Journal of Controlled Release journal homepage: www.elsevier.com/locate/jconrel Review article Delivery strategies of the CRISPR-Cas9 gene-editing system for therapeutic MARK applications ⁎ Chang Liu, Li Zhang, Hao Liu, Kun Cheng Division of Pharmaceutical Sciences, School of Pharmacy, University of Missouri-Kansas City, Kansas City, MO 64108, United States ARTICLE INFO ABSTRACT Keywords: The CRISPR-Cas9 genome-editing system is a part of the adaptive immune system in archaea and bacteria to CRISPR-Cas9 defend against invasive nucleic acids from phages and plasmids. The single guide RNA (sgRNA) of the system Delivery recognizes its target sequence in the genome, and the Cas9 nuclease of the system acts as a pair of scissors to Gene-editing cleave the double strands of DNA. Since its discovery, CRISPR-Cas9 has become the most robust platform for Gene therapy genome engineering in eukaryotic cells. Recently, the CRISPR-Cas9 system has triggered enormous interest in Non-viral delivery therapeutic applications. CRISPR-Cas9 can be applied to correct disease-causing gene mutations or engineer T Nanoparticle cells for cancer immunotherapy. The first clinical trial using the CRISPR-Cas9 technology was conducted in 2016. Despite the great promise of the CRISPR-Cas9 technology, several challenges remain to be tackled before its successful applications for human patients. The greatest challenge is the safe and efficient delivery of the CRISPR-Cas9 genome-editing system to target cells in human body. In this review, we will introduce the mo- lecular mechanism and different strategies to edit genes using the CRISPR-Cas9 system.