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Home > Medicine & Health Science textbooks > Medical specialties, branches of medicine > Pathology > Medical microbiology and virology > Differential Gene Expression Associated with Phenotypic Virulence of Mycobacterium Tuberculosis
Differential Gene Expression Associated with Phenotypic Virulence of Mycobacterium Tuberculosis

Differential Gene Expression Associated with Phenotypic Virulence of Mycobacterium Tuberculosis


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About the Book

This dissertation, "Differential Gene Expression Associated With Phenotypic Virulence of Mycobacterium Tuberculosis" by T H, Jason, Lam, 林梓軒, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled Differential Gene Expression Associated with Phenotypic Virulence of Mycobacterium tuberculosis submitted by Jason T.H. Lam for the degree of Master of Philosophy at the University of Hong Kong in August 2006 Tuberculosis (TB) remains one of the major infectious diseases and leading causes of death in the world. The ability to persist in human macrophages is central to the virulence of Mycobacterium tuberculosis (Mtb), the causative agent of TB, and is not invariable among various strains of Mtb. Particular strains of Mtb, named hypervirulent strains, grow significantly faster and persist inside the human macrophages. Atypical gene expression present in these hypervirulent strains may provide a clue to explore the virulent factors involved in the pathogenesis of Mtb, which are not fully elucidated. In the current study, 3 hypervirulent strains were identified from 118 clinical isolates of Mtb by determining the colony-forming unit (CFU) inside human peripheral blood monocyte-derived macrophages (PBMDMs) at day 0, 3, 6, and 10. Interestingly, all the 3 hypervirulent strains were isolated from patients suffering TB meningitis, which is the severest form of TB. Genotyping by insertion sequence 6110-restriction fragment length polymorphism (IS6110-RFLP) revealed that 2 of the 3 hypervirulent isolates were identical strains, probably spread by recent transmission. Mycobacterial gene expression during ex vivo macrophage challenge was measured by means of relative quantification using LightCylcer 2.0 Instrument. Using rrs gene as a normalisation gene, which was demonstrated to has least variation among 3 normalisation genes chosen, only fadE28 gene exhibited differential gene expression that was associated with the phenotypic virulence of Mtb, whereas the other 6 genes investigated, which include mce1A, mymA, acr, sigA, sugC, and Rv3723, showed indistinguishable expression patterns. The differential fadE28 expression also observed during in vitro acid shock suggests that the expression of fadE28 may be induced by the acidification of phagosome inside the human macrophages. Up-regulation of fadE28 gene in the hypervirulent strains may partly contribute to the virulence by increasing the efficiency of beta-oxidation (β-oxidation), which is essential for the persistence in human macrophages as Mtb probably uses fatty acids preferably to produce energy in the phagosome of macrophages. It is also possible that fadE28 is involved in an unknown process of lipid modification, as there are 35 paralogues of FadE proteins, which have been largely neglected. Findings of this study may lead to consideration of the genes involved in β-oxidation, including the fadE28 gene, when constructing a live attenuated Mtb vaccine strain. DOI: 10.5353/th_b3776900 Subjects: Mycobacterium tuberculosis - Pathogenesis Bacterial genetics Gene expression


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Product Details
  • ISBN-13: 9781374664609
  • Publisher: Open Dissertation Press
  • Publisher Imprint: Open Dissertation Press
  • Height: 279 mm
  • No of Pages: 170
  • Weight: 408 gr
  • ISBN-10: 137466460X
  • Publisher Date: 27 Jan 2017
  • Binding: Paperback
  • Language: English
  • Spine Width: 9 mm
  • Width: 216 mm


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