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A Bioluminescent Approach to Coxiella burnetii Pathogenesis: Development and Utilization of an In Vivo Imaging Model
A Bioluminescent Approach to Coxiella burnetii Pathogenesis: Development and Utilization o...
A Bioluminescent Approach to Coxiella burnetii Pathogenesis: Development and Utilization of an In Vivo Imaging Model

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20260202103028
ISBN  
9798286425273
DDC  
576
저자명  
Andrews, Jenna Myr.
서명/저자  
A Bioluminescent Approach to Coxiella burnetii Pathogenesis: Development and Utilization of an In Vivo Imaging Model
발행사항  
[Sl] : Yale University, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
152 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-12, Section: B.
주기사항  
Advisor: Roy, Craig Russell.
학위논문주기  
Thesis (Ph.D.)--Yale University, 2025.
초록/해제  
요약Coxiella burnetii is a Gram-negative, obligate intracellular bacterium that infects livestock and causes Q fever in humans, which can range from acute flu-like symptoms to severe, persistent infections. C. burnetii relies on a Dot/Icm type IVB secretion system to translocate effector proteins, manipulating host cell processes to support intracellular replication. While axenic media have facilitated in vitro pathogenesis research, in vivo studies remain limited due to the classification of the virulent Nine Mile phase I strain as a category B select agent. Although the avirulent phase II strain RSA493 is exempt from this classification, it is rapidly cleared in immunocompetent mouse models, restricting its use in in vivo studies. However, SCID mice have shown susceptibility to phase II infection, offering a viable model. To expand accessible in vivo C. burnetii research, I developed a bioluminescent imaging (BLI) model, enabling non-invasive tracking of infection dynamics and effector phenotypes.Here, I performed a series of studies demonstrating that phase II C. burnetii can infect A/J and C57BL/6 mouse models and that BLI enables precise tracking of bacterial burden. Furthermore, BLI allows for sensitive detection of virulence differences, including both severe Dot/Icm-dependent defects and subtle effects of individual effector protein mutants such as emcA::Tn. This technique can also be used to investigate host determinants of disease, as demonstrated using the complement C3 knockout mouse model to better understand the role of this protein in phase II C. burnetii clearance.Beyond in vivo imaging, BLI has also proven valuable ex vivo, revealing that visceral adipose tissue serves as a primary replication site for C. burnetii following intraperitoneal infection. Follow-up experiments confirmed that C. burnetii replicates in adipocytes both in vitro and in vivo. These findings suggest that adipose tissue represents a previously unrecognized niche for C. burnetii replication, offering potential insights into persistent infections in Q fever patients.Overall, this dissertation introduces a widely accessible and versatile model for studying phase II C. burnetii pathogenesis in vivo and highlights the utility of BLI for accurately tracking bacterial burden, assessing virulence differences, and analyzing host immune responses, further advancing C. burnetii pathogenesis research.
일반주제명  
Microbiology
일반주제명  
Immunology
일반주제명  
Pathology
일반주제명  
Molecular biology
키워드  
Adipose
키워드  
Bioluminescence imaging
키워드  
Coxiella burnetii
키워드  
Pathogenesis
기타저자  
Yale University Microbiology
기본자료저록  
Dissertations Abstracts International. 86-12B.
전자적 위치 및 접속  
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MARC

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■040    ▼aMiAaPQ▼cMiAaPQ
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■1001  ▼aAndrews,  Jenna  Myr.
■24512▼aA  Bioluminescent  Approach  to  Coxiella  burnetii  Pathogenesis:  Development  and  Utilization  of  an  In  Vivo  Imaging  Model
■260    ▼a[Sl]▼bYale  University▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a152  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-12,  Section:  B.
■500    ▼aAdvisor:  Roy,  Craig  Russell.
■5021  ▼aThesis  (Ph.D.)--Yale  University,  2025.
■520    ▼aCoxiella  burnetii  is  a  Gram-negative,  obligate  intracellular  bacterium  that  infects  livestock  and  causes  Q  fever  in  humans,  which  can  range  from  acute  flu-like  symptoms  to  severe,  persistent  infections.  C.  burnetii  relies  on  a  Dot/Icm  type  IVB  secretion  system  to  translocate  effector  proteins,  manipulating  host  cell  processes  to  support  intracellular  replication.  While  axenic  media  have  facilitated  in  vitro  pathogenesis  research,  in  vivo  studies  remain  limited  due  to  the  classification  of  the  virulent  Nine  Mile  phase  I  strain  as  a  category  B  select  agent.  Although  the  avirulent  phase  II  strain  RSA493  is  exempt  from  this  classification,  it  is  rapidly  cleared  in  immunocompetent  mouse  models,  restricting  its  use  in  in  vivo  studies.  However,  SCID  mice  have  shown  susceptibility  to  phase  II  infection,  offering  a  viable  model.  To  expand  accessible  in  vivo  C.  burnetii  research,  I  developed  a  bioluminescent  imaging  (BLI)  model,  enabling  non-invasive  tracking  of  infection  dynamics  and  effector  phenotypes.Here,  I  performed  a  series  of  studies  demonstrating  that  phase  II  C.  burnetii  can  infect  A/J  and  C57BL/6  mouse  models  and  that  BLI  enables  precise  tracking  of  bacterial  burden.  Furthermore,  BLI  allows  for  sensitive  detection  of  virulence  differences,  including  both  severe  Dot/Icm-dependent  defects  and  subtle  effects  of  individual  effector  protein  mutants  such  as  emcA::Tn.  This  technique  can  also  be  used  to  investigate  host  determinants  of  disease,  as  demonstrated  using  the  complement  C3  knockout  mouse  model  to  better  understand  the  role  of  this  protein  in  phase  II  C.  burnetii  clearance.Beyond  in  vivo  imaging,  BLI  has  also  proven  valuable  ex  vivo,  revealing  that  visceral  adipose  tissue  serves  as  a  primary  replication  site  for  C.  burnetii  following  intraperitoneal  infection.  Follow-up  experiments  confirmed  that  C.  burnetii  replicates  in  adipocytes  both  in  vitro  and  in  vivo.  These  findings  suggest  that  adipose  tissue  represents  a  previously  unrecognized  niche  for  C.  burnetii  replication,  offering  potential  insights  into  persistent  infections  in  Q  fever  patients.Overall,  this  dissertation  introduces  a  widely  accessible  and  versatile  model  for  studying  phase  II  C.  burnetii  pathogenesis  in  vivo  and  highlights  the  utility  of  BLI  for  accurately  tracking  bacterial  burden,  assessing  virulence  differences,  and  analyzing  host  immune  responses,  further  advancing  C.  burnetii  pathogenesis  research.
■590    ▼aSchool  code:  0265.
■650  4▼aMicrobiology
■650  4▼aImmunology
■650  4▼aPathology
■650  4▼aMolecular  biology
■653    ▼aAdipose
■653    ▼aBioluminescence  imaging
■653    ▼aCoxiella  burnetii
■653    ▼aPathogenesis
■690    ▼a0410
■690    ▼a0982
■690    ▼a0307
■690    ▼a0571
■71020▼aYale  University▼bMicrobiology.
■7730  ▼tDissertations  Abstracts  International▼g86-12B.
■790    ▼a0265
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17356746▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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