1 / 11

Genetics of Viruses

Genetics of Viruses. Viral Structure. Virus: “ poison ” (Latin) infectious particles consisting of a nucleic acid in a protein coat Capsid= viral envelope Contain DNA or RNA Bacteriophages (phages) are the most complex. Virus Diversity. Virus Reproduction. Host range

azuka
Télécharger la présentation

Genetics of Viruses

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Genetics of Viruses

  2. Viral Structure • Virus: • “poison” (Latin) • infectious particles consisting of a nucleic acid in a protein coat • Capsid= viral envelope • Contain DNA or RNA • Bacteriophages (phages) are the most complex

  3. Virus Diversity

  4. Virus Reproduction • Host range • infection of a limited range of host cells (receptor molecules on the surface of cells) • West Nile- wide range (mosquitoes, birds, horses, humans) • Measles- narrow range (only humans)

  5. Lytic Cycle • The lytic cycle: • attachment • injection • hydrolyzation • assembly • release • Results in death of host cell • Virulent virus (phage reproduction only by the lytic cycle)

  6. Lysogenic Cycle • Genome replicated w/o destroying the host cell • Genetic material of virus becomes incorporated into the host cell DNA (prophage DNA) • Temperate virus (phages capable of using the lytic and lysogenic cycle) • Phage λ • May give rise to lytic cycle

  7. Classes of Viruses

  8. RNA viruses • Retroviruses: transcribe DNA from an RNA template (RNADNA) • Most complicated reproductive cycle • Reverse transcriptase (catalyzing enzyme) • HIVAIDS

  9. Reproduction of HIV

  10. Vaccines and Emerging Viruses • Vaccines • Harmless versions of viruses • Helps immune system to build up antibodies for certain viruses • Emerging Viruses • Appear suddenly • AIDS, Ebola, SARS, H1N1

  11. Viroids and Prions • Viroids: • tiny, naked circular RNA • infect plants • do not code for proteins, but use cellular enzymes to reproduce • stunt plant growth • Prions: • “infectious proteins” (mad cow disease) • trigger chain reaction conversions

More Related