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Genomes and Genetics Lecture 3 Biology 3310/4310 Virology Spring 2017 Genomes and Genetics Lecture 3 Biology 3310/4310 Virology Spring 2017 “...everywhere an interplay between nucleic acids and proteins; a spinning wheel in which the thread makes the spindle and the spindle the thread” --ERWIN CHARGAFF Virology breakthrough in the 1950’s: The viral nucleic acid genome is the genetic code Hershey-Chase experiment with phage T4 Fraenkel-Conrat’s work with TMV Virology Lectures 2017 • Prof. Vincent Racaniello • Columbia University ©Principles of Virology, ASM Press Alfred Hershey & Martha Chase, 1952 Virology Lectures 2017 • Prof. Vincent Racaniello • Columbia University ©Principles of Virology, ASM Press The bigger surprise: thousands of different virions, seemingly infinite complexity of infections But a finite number of viral genomes Virology Lectures 2017 • Prof. Vincent Racaniello • Columbia University Key fact makes your life easier: Viral genomes must make mRNA that can be read by host ribosomes All viruses on the planet follow this rule, no exception to date Virology Lectures 2017 • Prof. Vincent Racaniello • Columbia University David Baltimore (Nobel laureate) used this insight to describe a simple way to think about virus genomes The original Baltimore system missed one genome type: the VII gapped DNA of the Hepadnaviridae Virology Lectures 2017 • Prof. Vincent Racaniello • Columbia University ©Principles of Virology, ASM Press Definitions • mRNA (ribosome ready) is always the plus (+) strand • DNA of equivalent polarity is also the (+) strand • RNA and DNA complements of (+) strands are negative (-) strands • Not all (+) RNA is mRNA! VII Virology Lectures 2017 • Prof. Vincent Racaniello • Columbia University ©Principles of Virology, ASM Press The elegance of the Baltimore system Knowing only the nature of the viral genome, one can deduce the basic steps that must take place to produce mRNA VII Virology Lectures 2017 • Prof. Vincent Racaniello • Columbia University ©Principles of Virology, ASM Press The seven classes of viral genomes • dsDNA • gapped dsDNA • ssDNA VII • dsRNA • ss (+) RNA • ss (-) RNA • ss (+) RNA with DNA intermediate Virology Lectures 2017 • Prof. Vincent Racaniello • Columbia University ©Principles of Virology, ASM Press Go to: b.socrative.com/login/student room number: virus Why is mRNA placed at the center of the Baltimore scheme? A. Because all virus particles contain mRNA B. There is no specific reason C. Because all viral genomes are mRNAs D. Because mRNA must be made from all viral genomes E. Because Baltimore studied mRNA 1 Viral DNA or RNA genomes are structurally diverse • Linear • Circular • Segmented • Gapped • Single-stranded (+) strand • Single-stranded (-) strand • Single stranded, ambisense • Double-stranded • Covalently attached proteins • Cross-linked ends of double-stranded DNA • DNA with covalently attached RNA Virology Lectures 2017 • Prof. Vincent Racaniello • Columbia University ©Principles of Virology, ASM Press What is the function of genome diversity? • DNA and RNA based - RNA genomes appeared first in evolution (RNA World) - Switch to DNA genomes - Only RNA genomes on planet today are viral - Viroids: Relics of RNA world? • Linear, circular, segmented, ds, ss, (+), (-) Virology Lectures 2017 • Prof. Vincent Racaniello • Columbia University Memorize 7 genome types and key virus families Parvovirus Hepatitis B virus VII Retrovirus Adenovirus Herpes simplex virus Poliovirus Reovirus Influenza virus If you know the genome structure you should be able to deduce: How mRNA is made from the genome How the genome is copied to make more genomes Virology Lectures 2017 • Prof. Vincent Racaniello • Columbia University ©Principles of Virology, ASM Press Virology Lectures 2017 • Prof. Vincent Racaniello • Columbia University What information is encoded in a viral genome? Gene products and regulatory signals for: - Replication of the viral genome - Assembly and packaging of the genome - Regulation and timing of the replication cycle - Modulation of host defenses - Spread to other cells and hosts Virology Lectures 2017 • Prof. Vincent Racaniello • Columbia University Information NOT contained in viral genomes • No genes encoding the complete protein synthesis machinery (AARS, eIFs, tRNAs) • No genes encoding proteins involved in energy production or membrane biosynthesis • No classical centromeres or telomeres found in standard host chromosomes • Probably we haven’t found them yet - 90% of giant virus genes are novel Virology Lectures 2017 • Prof. Vincent Racaniello • Columbia University Largest known viral genomes Virus Length Protein Pandoravirus salinus 2,473,870 2,541 Pandoravirus dulcis 1,908,524 1,487 Megavirus chilensis 1,259,197 1,120 Mamavirus 1,191,693 1,023 Mimivirus 1,181,549 979 Moumouvirus 1,021,348 894 Mimivirus M4 981,813 620 C. roenbergensis virus 617,453 544 Mollivirus sibericum 651,000 523 Pithovirus sibericum 610,033 467 Virology Lectures 2017 • Prof. Vincent Racaniello • Columbia University Smallest known viral genomes Virus Length Protein Viroid 120 none Satellite 220 none Hepatitis delta satellite 1,700 1 Circovirus 1,759 2 Anellovirus 2,170 4 Geminivirus 2,500 4 Hepatitis B virus 3,200 7 Levivirus 3,400 4 Partitivirus 3,700 2 Barnavirus 4,000 7 Virology Lectures 2017 • Prof. Vincent Racaniello • Columbia University Go to: b.socrative.com/login/student room number: virus What information may be encoded in a viral genome? A. Gene products that catalyze membrane biosynthesis B. Gene products that catalyze energy production C. Complete protein synthesis systems D. Centromeres or telomeres E. Enzymes to replicate the viral genome 2 Viral DNA genomes • The host genetic system is based on DNA • Many DNA viruses emulate the host • However, almost all viral DNA genomes are NOT like cell chromosomes • Unexpected tricks have evolved Virology Lectures 2017 • Prof. Vincent Racaniello • Columbia University dsDNA genomes Adenoviridae Herpesviridae Papillomaviridae Polyomaviridae Poxviridae Virology Lectures 2017 • Prof. Vincent Racaniello • Columbia University ©Principles of Virology, ASM Press dsDNA genomes Genomes copied by host DNA polymerase Genomes encode DNA polymerase Papillomaviridae (8 kbp) Virology Lectures 2017 • Prof. Vincent Racaniello • Columbia University ©Principles of Virology, ASM Press Gapped dsDNA genomes reverse protein RNA transcriptase This genome cannot be copied to mRNA Hepadnaviridae Hepatitis B virus Virology Lectures 2017 • Prof. Vincent Racaniello • Columbia University ©Principles of Virology, ASM Press ssDNA genomes TT virus (ubiquitous human virus) B19 parvovirus (fifth disease) Virology Lectures 2017 • Prof. Vincent Racaniello • Columbia University ©Principles of Virology, ASM Press Go to: b.socrative.com/login/student room number: virus Which DNA genome, on entry into the cell, can be immediately copied into mRNA? A. dsDNA B. gapped dsDNA C. circular ssDNA D. linear ssDNA E. All of the above 3 RNA genomes • Cells have no RNA-dependent RNA polymerase (RdRp) • RNA virus genomes encode RdRp • RdRp produce RNA genomes and mRNA from RNA templates Virology Lectures 2017 • Prof. Vincent Racaniello • Columbia University dsRNA genome Rotavirus (human gastroenteritis) Virology Lectures 2017 • Prof. Vincent Racaniello • Columbia University ©Principles of Virology, ASM Press Cytoplasm Nucleus 1 2 5' c 5' c 4 P1234 3 5' c 5' c 5 nsP1 nsP4 5' c ssRNA: (+) sense nsP2 nsP3 5' c 6 Picornaviridae (Poliovirus, Rhinovirus) Capsid PE2 6K E1 7 c Caliciviridae (gastroenteritis) 5' ER Coronaviridae (SARS) 8 10 Golgi Flaviviridae (Yellow fever virus, West Nile virus, Hepatitis C virus, Zika virus) 11 9 12 Togaviridae (Rubella virus, Equine encephalitis virus) 13 Virology Lectures 2017 • Prof. Vincent Racaniello • Columbia University ©Principles of Virology, ASM Press ScEYEnce Studios Principles of Virology, 4e Fig. APP01-34 9-28-14 ssRNA: (+) sense Virology Lectures 2017 • Prof. Vincent Racaniello • Columbia University ©Principles of Virology, ASM Press Cytoplasm 1 2 3 Preintegration 4 complex 5 Nucleus Provirus 7 6 5' c 5' c 5' c 5' c 8 Precursors 10 5' c Gag-Pol MA CA NC PR RT IN 9 Gag MA CA NC PR 11 5' c MA ER MA CA CA NC NC PR PR RT IN ER 12 ssRNA(+) sense with DNA intermediate Golgi 14 13 5' 5' One viral family: Retroviridae 15 Two human pathogens: 16 Human immunodeficiency virus (HIV) Human T-lymphotropic virus (HTLV) Virology Lectures 2017 • Prof. Vincent Racaniello • Columbia University ©Principles of Virology, ASM Press ScEYEnce Studios Principles of Virology, 4e Fig. APP01-30 9-29-14 The remarkable retroviral genome strategy A ss (+) RNA with DNA intermediate: Retroviridae + RNA – DNA provirus DNA + RNA B Retroviridae (7–10 kb) Virology Lectures 2017 • Prof. Vincent Racaniello • Columbia University ©Principles of Virology, ASM Press U5 U3 5' c AnAOH3’ ScEYEnce Studios Principles of Virology, 4e Volume 01 Fig. 03.06 10-28-14 Cytoplasm 1 2 3 PB1-F2 11 12 10a PB1 PA PB2 NP 13 4 c 8 Host mRNA Nucleus 5' c 3' c PB1, PB2, PA 6 c HA, NA 14 c M1, NS1 5 c M2, NEP 6 6 7 1 5' c c c 3' 7 ssRNA, (-) sense HA NA 2 Nucleus 9 ER M2 NEP/NS2 M1 NS1 15 5' c Paramyxoviridae3' (Measles virus, Mumps virus) 10b Golgi 17 Z L 3 GP NP Rhabdoviridae (Rabies virus) 5’ c 3’ 5’ c 3’ 18 16 Filoviridae (Ebolavirus, Marburg virus) c 5’ c 5’ 4 4 L NP Orthomyxoviridae (Influenza virus) 19 5 5 9 3’ 5’ 3’ 5’ Arenaviridae (Lassa virus) 5’ c 5’ c 6 Virology Lectures 2017 • Prof. Vincent Racaniello • Columbia University ©Principles of Virology, ASM Press 6 GP-C ER Z 7 ScEYEnce Studios 8 GP1 GP2 Principles of Virology, 4e GolgiFig. APP01-16 9-28-14 ScEYEnce Studios Principles of Virology, 4e Fig. APP01-04 9-27-14 ssRNA, (-) sense A ss (–) RNA: Orthomyxoviridae, Paramyxoviridae, Rhabdoviridae – RNA + RNA – RNA B Segmented genomes: Orthomyxoviridae C Ambisense (–) strand RNA (10–15 kb in 6–8 RNAs) Arenaviridae (11 kb in 2 RNAs) (–) strand RNA segments Bunyaviridae (12–23 kb in 3 RNAs) 1 2 3 4 3' 5' 3' 5' 3' 5' 3' 5' L RNA 5’ c 5 6 7 8 3’ 3' 5' 3' 5' 3' 5' 3' 5' Nonsegmented genomes: Paramyxoviridae (15–16 kb) S RNA 5’ c 3’ 3' 5' Rhabdoviridae (13–16 kb) Virology Lectures 2017 • Prof.
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