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Viruses I
N/A
29
Biology
Graduate
03/31/2010

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Term

What are the receptors for:

  1. Influenza
  2. EBV
  3. Rhinovirus
  4. Adenovirus
  5. Rabies
Definition
  1. Influenza: sialic acid
  2. EBV: CD3 complement receptor on B cells
  3. Rhinovirus: ICAM-1 on mucosal cells
  4. Adenovirus: CD55 (DAF) and CAR (coxsackie adenovirus receptor)
  5. Rabies: acetylcholine receptor on neurons
Term
What cytokines are key players in upregulating cell-mediated immunity to eradicte a viral infection?
Definition

TNF-α

TNF-β

IFN-γ

IL-12

Term
What are the sensing mechanisms of cells to virus?
Definition
  1. RIG-I detect dsRNA in the cytoplasm
  2. TLR's detect viral RNA at the cell surface or within the endosome
Term
What is the role of IFN in cell-mediated immune response to virus? What compounds are produced in response to IFN?
Definition

IFN upregulates:

  1. Mx protein: inhibits viral assembly
  2. PKR (protein kinase R): inhibits viral protein translation
  3. OAS (oligoadenylate synthase): synthesis poly-A molecule that activates RNase L
  4. RNase L: cleaves viral RNA
Term
Which viruses have live attenuated vaccines?
Definition
  1. Measles
  2. Mumps
  3. Rubella
  4. Polio
Term

For human parvovirus, give the:

  1. Size
  2. Enveloped or non-enveloped?
  3. Genome, and replicates where?
Definition
  1. 45 nm
  2. Non-enveloped
  3. Circular dsDNA, so replicates in the nucleus
Term

For human papilloma virus, give the:

  1. Size
  2. Enveloped or non-enveloped?
  3. Genome, and where does it replicate?
Definition
  1. 50-55 nm
  2. Non-enveloped
  3. Circular dsDNA, replicates in the nucleus
Term
Between parvovirus and papilloma virus, which one transcribes from both DNA strands? Which one transcribes early and late antigens?
Definition
Parvovirus for both
Term
What infections does parvovirus cause?
Definition

Opportunistic infections:

 

  1. SV40 in monkeys
  2. BK: renal disease
  3. JC: PML, B cell and monocyte infection
Term
What infections do human papilloma viruses cause?
Definition
  1. HPV 6 and 11: genital warts
  2. HPV 16 and 18: cervical hyperplasia
Term
  1. How is human parvovirus transmitted?
  2. How is human papilloma virus transmitted?
Definition
  1. Inhalation
  2. Contact with surfaces
Term
What are the virulence factors for parvovirus and how do they function?
Definition

Late T antigen:

 

  1. Initiates transcription of viral DNA
  2. Binds to p53 and P105RB to induce S phase in the host cell
Term
What are the virulence factors for human papilloma virus and how do they function?
Definition
  1. E1 and E2 initiate transcription of viral DNA
  2. E6 and E7 bind to P53 and P105RB to induce S phase in the host cell
Term
Between parvovirus and human papilloma virus, which can replicate in vitro?
Definition
Parvovirus (papilloma virus requires epithelial cells)
Term
What form is latent parvovirus DNA? Papilloma virus DNA?
Definition

Parvovirus: plasmid

Papilloma virus: integrated

Term
How does latent human papilloma virus cause dysplasia?
Definition
E1 and E2 are inactivated so do not cause the virus to replicate. E6 and E7 continue to induce S phase in the host cell, which causes dysplasia.
Term
From which protein is the human papilloma virus vaccine made?
Definition
L1 capsid protein
Term

For herpes virus:

  1. Size?
  2. Enveloped or non-enveloped?
  3. Genome and replication site?
  4. Histone-bound?
Definition
  1. 75-150 nm
  2. Enveloped
  3. dsDNA
  4. Only latent DNA bound by histone
Term
Describe the cascade of transcription of herpes virus DNA
Definition
  1. Immediate Early: alpha proteins that act as transcription factors for beta proteins
  2. Early: beta proteins that are both enzymes (including DNA polymerase) and transciption factors for gamma proteins
  3. Late: gamma proteins that are structural proteins
Term
Does herpes virus use it's own or the host's DNA polymerase?
Definition
Both. It uses its own duringa active infection and uses the host's during latent infection.
Term
Which herpes viruses only have one isomer of DNA?
Definition
EBV and HSV-6
Term
Is latent human herpes virus integrated or plasmid?
Definition
Either.
Term
Infections caused by HSV-1 and HSV-2?
Definition
  1. Genital and non-genital warts
  2. Encephalitis (HSV-1)
  3. Meningitis (HSV-2)
  4. Gingivostomatitis
  5. Herpetic keratitis
  6. Herpetic Whitlow
  7. Neonatal herpes
Term
What diseases do HSV-6 and HSV-7 cause?
Definition
Roseola infantum (exanthema subitum)
Term
What diseases do HSV-8 cause?
Definition
  1. Kaposi's sarcoma
  2. Castleman's disease (non-malignant B cell proliferative disorder)
  3. Body-cavity based effusion lymphoma
Term
What diseases do CMV cause?
Definition
  1. Heterophile Ab (-) infectious mono
  2. Transplacental disease
Term
What diseases do EBV cause?
Definition
  1. Heterophile Ab (+) infectious mononucleosis
  2. Burkitt's lymphoma
  3. Nasopharyngeal carcinoma
Term
What are the herpes viruses that effect humans?
Definition
HSV-1, HSV-2, HSV-6, HSV-7, HSV-8, CMV, EBV, VZV
Term
What is the mechanism of phosphoanacetic and phosphonoformic acid?
Definition
Bind to Herpes viral DNA polymerase and prevent elongation of viral DNA
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