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Chemotaxis to Microbial and Plant-Derived Chemicals by C. Elegans Nematodes and its Dependence on Feeding State
Chemotaxis to Microbial and Plant-Derived Chemicals by C. Elegans Nematodes and its Depend...
Chemotaxis to Microbial and Plant-Derived Chemicals by C. Elegans Nematodes and its Dependence on Feeding State

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자료유형  
 학위논문 서양
최종처리일시  
20250211153117
ISBN  
9798346565802
DDC  
616
저자명  
Logan-Garbisch, Theresa.
서명/저자  
Chemotaxis to Microbial and Plant-Derived Chemicals by C. Elegans Nematodes and its Dependence on Feeding State
발행사항  
[Sl] : Stanford University, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
121 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-05, Section: B.
주기사항  
Advisor: Goodman, Miriam.
학위논문주기  
Thesis (Ph.D.)--Stanford University, 2024.
초록/해제  
요약Throughout history, humans have relied on plants for medication, flavoring, and food, and these plants have also coexisted in ecological communities with other plants, fungi, and animals for millions of years, evolving mechanisms of chemical communication. They release wide arrays of compounds into the environment, affecting animal and microbe behavior. Nematodes, like Caenorhabditis elegans, living in such communities must distinguish harmful from beneficial molecules. In this thesis, I present first a new platform we used to determine the chemotaxis valence of single molecules in C. elegans. In a screen of 90 plant molecules, 37 affected wild-type animals. Analysis of mutants defective in chemosensory ion channels reveals that most compounds relied on multiple ion channels, and chemotaxis valence is more likely to reflect an integration of neural signals than a labeled line. Using this platform, I further examined whether the biosynthetic precursors of natural products could also elicit responses, possibly as a co-evolutionary remnant. Many organisms, including plants and fungi, synthesize the strong attractants isoamyl alcohol and 2-methyl-1-butanol, and, when well-fed, wild-type and mutant nematodes exhibited weak or absent responses to precursor molecules, suggesting that they could be detected but were not particularly motivating. Following prolonged starvation, chemotactic responses were altered in two primary ways: responsiveness decreased to both strong attractants, and a new sensitivity to a precursor compound reliant on OSM-9 TRP channel signaling was revealed. These data also provided additional support for neural signal integration of chemosensory cues. Future studies will be needed to understand how starvation induces these changes in chemosensory behavior and signal integration. Understanding these dynamics sheds light on complex community interactions.
일반주제명  
Neurosciences
일반주제명  
Worms
일반주제명  
Success
일반주제명  
Butterflies & moths
일반주제명  
Communication
일반주제명  
Dissection
일반주제명  
Funding
일반주제명  
Solvents
일반주제명  
Entomology
기타저자  
Stanford University.
기본자료저록  
Dissertations Abstracts International. 86-05B.
전자적 위치 및 접속  
로그인 후 원문을 볼 수 있습니다.

MARC

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■0820  ▼a616
■1001  ▼aLogan-Garbisch,  Theresa.
■24510▼aChemotaxis  to  Microbial  and  Plant-Derived  Chemicals  by  C.  Elegans  Nematodes  and  its  Dependence  on  Feeding  State
■260    ▼a[Sl]▼bStanford  University▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a121  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-05,  Section:  B.
■500    ▼aAdvisor:  Goodman,  Miriam.
■5021  ▼aThesis  (Ph.D.)--Stanford  University,  2024.
■520    ▼aThroughout  history,  humans  have  relied  on  plants  for  medication,  flavoring,  and  food,  and  these  plants  have  also  coexisted  in  ecological  communities  with  other  plants,  fungi,  and  animals  for  millions  of  years,  evolving  mechanisms  of  chemical  communication.  They  release  wide  arrays  of  compounds  into  the  environment,  affecting  animal  and  microbe  behavior.  Nematodes,  like  Caenorhabditis  elegans,  living  in  such  communities  must  distinguish  harmful  from  beneficial  molecules.  In  this  thesis,  I  present  first  a  new  platform  we  used  to  determine  the  chemotaxis  valence  of  single  molecules  in  C.  elegans.  In  a  screen  of  90  plant  molecules,  37  affected  wild-type  animals.  Analysis  of  mutants  defective  in  chemosensory  ion  channels  reveals  that  most  compounds  relied  on  multiple  ion  channels,  and  chemotaxis  valence  is  more  likely  to  reflect  an  integration  of  neural  signals  than  a  labeled  line.  Using  this  platform,  I  further  examined  whether  the  biosynthetic  precursors  of  natural  products  could  also  elicit  responses,  possibly  as  a  co-evolutionary  remnant.  Many  organisms,  including  plants  and  fungi,  synthesize  the  strong  attractants  isoamyl  alcohol  and  2-methyl-1-butanol,  and,  when  well-fed,  wild-type  and  mutant  nematodes  exhibited  weak  or  absent  responses  to  precursor  molecules,  suggesting  that  they  could  be  detected  but  were  not  particularly  motivating.  Following  prolonged  starvation,  chemotactic  responses  were  altered  in  two  primary  ways:  responsiveness  decreased  to  both  strong  attractants,  and  a  new  sensitivity  to  a  precursor  compound  reliant  on  OSM-9  TRP  channel  signaling  was  revealed.  These  data  also  provided  additional  support  for  neural  signal  integration  of  chemosensory  cues.  Future  studies  will  be  needed  to  understand  how  starvation  induces  these  changes  in  chemosensory  behavior  and  signal  integration.  Understanding  these  dynamics  sheds  light  on  complex  community  interactions.
■590    ▼aSchool  code:  0212.
■650  4▼aNeurosciences
■650  4▼aWorms
■650  4▼aSuccess
■650  4▼aButterflies  &  moths
■650  4▼aCommunication
■650  4▼aDissection
■650  4▼aFunding
■650  4▼aSolvents
■650  4▼aEntomology
■690    ▼a0459
■690    ▼a0317
■690    ▼a0353
■71020▼aStanford  University.
■7730  ▼tDissertations  Abstracts  International▼g86-05B.
■790    ▼a0212
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17165047▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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