Lecture 2 & 7 Virology

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28 Terms

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What are Viruses?

Small Infectious agents consisting of the nucleic acid genome. Some viruses carry enzymes that aid in replication such as reverse transcriptase.

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What is a capsid

A layer of protein made up of capsomeresand provides protection.

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What is an envelope & what does it help do

An additional layer of protein and lipids surrounds the nucleic acid genome. Helps with the fusion of cellular receptors for viral entry in a cell type.

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Where does Poxivirus replicate?

Cytoplasm only

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Dmitri Iwanowski

One of the founders of Virology, studied tobacco plants can trasmit diseaseto other plants after passage.

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Martinus Beijerinck

Known as the father of virology, found that tobacco plant disease can reproduce only in the host.

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Felix d’Herelle

Recognizes viruses which infect bacteria which he calls bacteriophages.

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Wendell Stanley

Crystallizes Tobacco Mosaic Virus (TMV) and shows that it ramins infectious.

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Max Theiler

First to propogate yellow fever virus in chick embryos & create a vaccine.

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Salvador Luria & Alfred Hershey

Demonstrate bacteriophages mutate

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Alfred Hershey & Martha Chase

Demonstrate DNA was genetic material of a bacteriophage.

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Jonas Folk

Discovered Polio Vaccine

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Heinz Fraenkel-Conrat & R.C. Williams

Shows Tobacco Mosaic Virus RNA & Coat Protein were incubated together.

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Baruch Blumberg

Discovers hepatitis B Virus

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Howard Temin & David Baltimore

Discovered reverse transciptase in retrovirus

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Luc Montaigner & Robert Gallo

Discovered Human immunodeficiency virus

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Antigenic Shift (Recombination)

Generates viruses with entriely new genetic makeup, creation of a new strain.

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Antigenic Drift (Accumulated Mutations)

Slow mutations with slightly modified genetic makeup, create a new strain similar to the parent

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Viral Tropism

Infection of only one type at the cellular level, tissue level or host level.

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Wide Genetic Bottle Neck

Start w/a lot of different virus populations, end up with a lot of different virus populations.

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Tight Genetic Bottle neck

Selective to a few viruses that have the “founding principle” to become the “founding population”. Not all viruses will make it through the bottleneck.

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Heterogeneity in host & virus.

The same virus that comes in does not become the same virus coming out.

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Innate antiviral immune signaling pathways

Virus comes into contact w/double stranded dna, activates sting pathways. Virus comes onto double stranded RNA, could cause cell to kill itself.

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Immune Escape

Neutralizing antibodies bind to surface of spike protein, now spikes of viral protein can’t bind to the host.

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Immune Evasion

Starts at the host cell and acts like a shield, just blocking and deflecting viruses.

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Red Queen Pinrciple of the Evolutionary Arms Race

As vaccines continue to become developed, viruses will continue to mutant to out grow the vaccine rate and become stronger.

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What makes Zika virus so special?

It has a very large range of tropism allowing it to infect multiple things at multiple cellular levels.

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