High throughput RNA interference based screen for the identification of genes implicated in listeria monocytogenes infection

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dc.contributor.advisorBrombacher, Franken_ZA
dc.contributor.advisorMhlanga, N Emans Men_ZA
dc.contributor.authorTantoh, Asongwe Lionel Atehen_ZA
dc.date.accessioned2014-11-11T06:57:49Z
dc.date.available2014-11-11T06:57:49Z
dc.date.issued2014en_ZA
dc.descriptionIncludes bibliographical references.en_ZA
dc.description.abstractThe facultative intracellular pathogen L. monocytogenes has acquired a versatile arsenal of adaptor proteins. It uses these proteins to invade and undermine the host immune surveillance system, as well as to survive and propagate within the host cell. Our understanding of how L. monocytogenes infects cells points towards an interplay between bacterial proteins and human host factors. It has become apparent that this interplay is critical for the establishment and spread of infection. Here we describe a high throughput screening approach to assay for potential human host factors involved in L. monocytogenes infection. In this methodology, we applied a high-density siRNA array comprising of the kinome, phosphatome, ubiquitome and protease encoding human genes that enabled rapid parallel screening for human host factors through reverse transfection into overlaid HeLa cells. The siRNA transfected HeLa cells were exposed to L. monocytogenes expressing the green fluorescent protein. The high content screen comprised a total of 15 replicate screens or 47, 250 individual siRNA experiments. Using a combination of image-based analysis and the data-mining tool of Principal Component Analysis, genes whose silencing visually impaired or enhanced bacteria invasion/proliferation were selected as candidate genes. The 65 strongest genes were subjected to a secondary screening for validation. Among the 15 confirmed hits, we recognized some cellular membrane proteins that might function as cell receptors for bacteria entry and others that may be related to calcium release triggered by bacteria during cell invasion. In addition, we identified a transcription factor bromo adjacent homology domain-containing 1(BAHD1) protein, whose interplay with the bacterial virulence factor LntA has recently been shown to modulate IFN-λ-mediated immune response to control bacterial colonization of the host cell. Also, we identified the inositol polyphosphate-5-phosphatase (INPP5B) that may regulate bacterial internalization by modulating actin dynamics at bacterial internalization sites as shown with oculocerebrorenal syndrome of Lowe (OCRL), whose OCRL gene shares an identical sequence and overlapping enzyme activities with INPP5B. We also identified the large tumor suppressor kinase 2 (LATS2) that may play a potential role in bacterial colonization by modulating the expression of the host E-cad receptor gene. This study represents a significant step toward unveiling the key molecular requirements for host cell invasion and undoubtedly provides an avenue of new therapeutic drugs against L. monocytogenes infection.en_ZA
dc.identifier.apacitationTantoh, A. L. A. (2014). <i>High throughput RNA interference based screen for the identification of genes implicated in listeria monocytogenes infection</i>. (Thesis). University of Cape Town ,Faculty of Health Sciences ,Department of Medicine. Retrieved from http://hdl.handle.net/11427/9533en_ZA
dc.identifier.chicagocitationTantoh, Asongwe Lionel Ateh. <i>"High throughput RNA interference based screen for the identification of genes implicated in listeria monocytogenes infection."</i> Thesis., University of Cape Town ,Faculty of Health Sciences ,Department of Medicine, 2014. http://hdl.handle.net/11427/9533en_ZA
dc.identifier.citationTantoh, A. 2014. High throughput RNA interference based screen for the identification of genes implicated in listeria monocytogenes infection. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Tantoh, Asongwe Lionel Ateh AB - The facultative intracellular pathogen L. monocytogenes has acquired a versatile arsenal of adaptor proteins. It uses these proteins to invade and undermine the host immune surveillance system, as well as to survive and propagate within the host cell. Our understanding of how L. monocytogenes infects cells points towards an interplay between bacterial proteins and human host factors. It has become apparent that this interplay is critical for the establishment and spread of infection. Here we describe a high throughput screening approach to assay for potential human host factors involved in L. monocytogenes infection. In this methodology, we applied a high-density siRNA array comprising of the kinome, phosphatome, ubiquitome and protease encoding human genes that enabled rapid parallel screening for human host factors through reverse transfection into overlaid HeLa cells. The siRNA transfected HeLa cells were exposed to L. monocytogenes expressing the green fluorescent protein. The high content screen comprised a total of 15 replicate screens or 47, 250 individual siRNA experiments. Using a combination of image-based analysis and the data-mining tool of Principal Component Analysis, genes whose silencing visually impaired or enhanced bacteria invasion/proliferation were selected as candidate genes. The 65 strongest genes were subjected to a secondary screening for validation. Among the 15 confirmed hits, we recognized some cellular membrane proteins that might function as cell receptors for bacteria entry and others that may be related to calcium release triggered by bacteria during cell invasion. In addition, we identified a transcription factor bromo adjacent homology domain-containing 1(BAHD1) protein, whose interplay with the bacterial virulence factor LntA has recently been shown to modulate IFN-λ-mediated immune response to control bacterial colonization of the host cell. Also, we identified the inositol polyphosphate-5-phosphatase (INPP5B) that may regulate bacterial internalization by modulating actin dynamics at bacterial internalization sites as shown with oculocerebrorenal syndrome of Lowe (OCRL), whose OCRL gene shares an identical sequence and overlapping enzyme activities with INPP5B. We also identified the large tumor suppressor kinase 2 (LATS2) that may play a potential role in bacterial colonization by modulating the expression of the host E-cad receptor gene. This study represents a significant step toward unveiling the key molecular requirements for host cell invasion and undoubtedly provides an avenue of new therapeutic drugs against L. monocytogenes infection. DA - 2014 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2014 T1 - High throughput RNA interference based screen for the identification of genes implicated in listeria monocytogenes infection TI - High throughput RNA interference based screen for the identification of genes implicated in listeria monocytogenes infection UR - http://hdl.handle.net/11427/9533 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/9533
dc.identifier.vancouvercitationTantoh ALA. High throughput RNA interference based screen for the identification of genes implicated in listeria monocytogenes infection. [Thesis]. University of Cape Town ,Faculty of Health Sciences ,Department of Medicine, 2014 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/9533en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Medicineen_ZA
dc.publisher.facultyFaculty of Health Sciencesen_ZA
dc.publisher.institutionUniversity of Cape Town
dc.titleHigh throughput RNA interference based screen for the identification of genes implicated in listeria monocytogenes infectionen_ZA
dc.typeDoctoral Thesis
dc.type.qualificationlevelDoctoral
dc.type.qualificationnamePhDen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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