Effects of herpesviral US3 protein kinase on DNA damage

Herpes simplex virus type 1 is an enveloped human pathogen that can be engineered for oncolytic virus therapy. The viral genome encodes the US3 protein kinase which regulates many cellular and viral processes during infection. For example, US3 protein kinase is a known inhibitor of caspase-3 acti...

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Päätekijä: Miettinen, Laura
Muut tekijät: Matemaattis-luonnontieteellinen tiedekunta, Faculty of Sciences, Bio- ja ympäristötieteiden laitos, Department of Biological and Environmental Science, Jyväskylän yliopisto, University of Jyväskylä
Aineistotyyppi: Pro gradu
Kieli:eng
Julkaistu: 2023
Aiheet:
Linkit: https://jyx.jyu.fi/handle/123456789/86552
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author Miettinen, Laura
author2 Matemaattis-luonnontieteellinen tiedekunta Faculty of Sciences Bio- ja ympäristötieteiden laitos Department of Biological and Environmental Science Jyväskylän yliopisto University of Jyväskylä
author_facet Miettinen, Laura Matemaattis-luonnontieteellinen tiedekunta Faculty of Sciences Bio- ja ympäristötieteiden laitos Department of Biological and Environmental Science Jyväskylän yliopisto University of Jyväskylä Miettinen, Laura Matemaattis-luonnontieteellinen tiedekunta Faculty of Sciences Bio- ja ympäristötieteiden laitos Department of Biological and Environmental Science Jyväskylän yliopisto University of Jyväskylä
author_sort Miettinen, Laura
datasource_str_mv jyx
description Herpes simplex virus type 1 is an enveloped human pathogen that can be engineered for oncolytic virus therapy. The viral genome encodes the US3 protein kinase which regulates many cellular and viral processes during infection. For example, US3 protein kinase is a known inhibitor of caspase-3 activation. Caspase-3 activates caspase-activated DNAse, which fragments DNA during apoptosis. The connection between US3 and DNA fragmentation has yet to be demonstrated. This thesis investigates the effect of viral US3 protein kinase on cellular DNA damage. In these studies, we compared the amount of DNA damage in cells infected with herpes simplex type 1 US3 deletion virus and the repair virus with reinserted US3 gene. Cell viability and the amount of DNA damage and nuclear caspase-activated DNAse during infections were analyzed with the comet assay, trypan blue staining, and confocal microscopy. We found that infected cells with US3 deletion virus had increased DNA damage 12 hours post infection and had higher fluorescence intensity in DNA damage loci at 16 hours post infection compared to US3 repair virus infected cells. Based on the comet assay, it was found that herpes infection caused DNA damage in the host genome regardless of whether it contained the US3 protein. The intensity of caspase-activated DNAse in the nucleus was decreased in the US3 deletion virus infection compared to repair virus infection at eight and twelve hours post infection. The viability of US3 deletion virus infected cells decreased significantly between twelve and sixteen hours post infection. As a conclusion, DNA damage was more extensive in US3 deletion virus infected cells than in US3 repair virus infected cells. In conclusion, our results suggest that US3 protects the host cell genome from DNA damage during herpes infection. However, the higher amount of the DNA damage in US3 deletion virus infection could not be attributed to an increased presence of caspase-activated DNAse in the nucleus. It is highly likely that the US3 protein may phosphorylate yet unknown cellular and viral proteins, and these phosphorylation events potentially affect the amount of DNA damage in the infected cell.
first_indexed 2023-04-25T20:16:09Z
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The viral genome encodes the US3 \nprotein kinase which regulates many cellular and viral processes during infection. \nFor example, US3 protein kinase is a known inhibitor of caspase-3 activation. \nCaspase-3 activates caspase-activated DNAse, which fragments DNA during \napoptosis. The connection between US3 and DNA fragmentation has yet to be \ndemonstrated. This thesis investigates the effect of viral US3 protein kinase on \ncellular DNA damage. In these studies, we compared the amount of DNA \ndamage in cells infected with herpes simplex type 1 US3 deletion virus and the \nrepair virus with reinserted US3 gene. Cell viability and the amount of DNA \ndamage and nuclear caspase-activated DNAse during infections were analyzed \nwith the comet assay, trypan blue staining, and confocal microscopy. We found \nthat infected cells with US3 deletion virus had increased DNA damage 12 hours \npost infection and had higher fluorescence intensity in DNA damage loci at 16 \nhours post infection compared to US3 repair virus infected cells. Based on the \ncomet assay, it was found that herpes infection caused DNA damage in the host \ngenome regardless of whether it contained the US3 protein. The intensity of \ncaspase-activated DNAse in the nucleus was decreased in the US3 deletion virus \ninfection compared to repair virus infection at eight and twelve hours post \ninfection. The viability of US3 deletion virus infected cells decreased significantly \nbetween twelve and sixteen hours post infection. As a conclusion, DNA damage \nwas more extensive in US3 deletion virus infected cells than in US3 repair virus \ninfected cells. In conclusion, our results suggest that US3 protects the host cell \ngenome from DNA damage during herpes infection. However, the higher \namount of the DNA damage in US3 deletion virus infection could not be \nattributed to an increased presence of caspase-activated DNAse in the nucleus. It \nis highly likely that the US3 protein may phosphorylate yet unknown cellular \nand viral proteins, and these phosphorylation events potentially affect the \namount of DNA damage in the infected cell.", "language": "en", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted by Paivi Vuorio (paelvuor@jyu.fi) on 2023-04-25T05:48:33Z\nNo. of bitstreams: 0", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2023-04-25T05:48:33Z (GMT). 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spellingShingle Miettinen, Laura Effects of herpesviral US3 protein kinase on DNA damage Solu- ja molekyylibiologia Cell and molecular biology 4013 herpes simplex -virus herpes simplex virus
title Effects of herpesviral US3 protein kinase on DNA damage
title_full Effects of herpesviral US3 protein kinase on DNA damage
title_fullStr Effects of herpesviral US3 protein kinase on DNA damage Effects of herpesviral US3 protein kinase on DNA damage
title_full_unstemmed Effects of herpesviral US3 protein kinase on DNA damage Effects of herpesviral US3 protein kinase on DNA damage
title_short Effects of herpesviral US3 protein kinase on DNA damage
title_sort effects of herpesviral us3 protein kinase on dna damage
title_txtP Effects of herpesviral US3 protein kinase on DNA damage
topic Solu- ja molekyylibiologia Cell and molecular biology 4013 herpes simplex -virus herpes simplex virus
topic_facet 4013 Cell and molecular biology Solu- ja molekyylibiologia herpes simplex -virus herpes simplex virus
url https://jyx.jyu.fi/handle/123456789/86552 http://www.urn.fi/URN:NBN:fi:jyu-202304252666
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