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Motivational Control of Drosophila Copulation Across Timescales
Motivational Control of Drosophila Copulation Across Timescales
Motivational Control of Drosophila Copulation Across Timescales

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20250211151350
ISBN  
9798382783536
DDC  
616
저자명  
Miner, Lauren Elizabeth.
서명/저자  
Motivational Control of Drosophila Copulation Across Timescales
발행사항  
[Sl] : Harvard University, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
400 p
주기사항  
Source: Dissertations Abstracts International, Volume: 85-12, Section: B.
주기사항  
Advisor: Crickmore, Michael A.
학위논문주기  
Thesis (Ph.D.)--Harvard University, 2024.
초록/해제  
요약Behavioral choices incorporate information obtained over vastly different timescales: from experiences the animal had days or even years ago, to real-time information about the environment and progress of a behavior. How do the neurons that ultimately make the choice to begin, persist in, or terminate a behavior integrate all this information? The relatively simple brain of the fly - and the still simpler sexually dimorphic circuitry that controls reproductive behavior - presents an opportunity to gain mechanistic insight into how behavior is calibrated to reflect life experience.Courtship emerges over the first three days of life as a male reaches sexual maturity. Once in adulthood, courtship is vigorous until the animal achieves its goal of copulation, after which it is decreased and takes three days to recover. I show that the similarity between these timescales is no coincidence: hormones take advantage of the same neural circuit motifs that regulate satiety after repeatedly mating to implement sexual abstinence in adolescence.I next show that like courtship, the motivation to copulate is changed by recent mating experience. I found that dopaminergic neurons in the ventral nervous system signal through the D2 receptor to the ~8 Copulation Decision Neurons (CDNs), which cause mating termination when pushed past threshold. The immediate consequence of this signaling is the elevation of intracellular CaMKII, whose activity changes the ability of the CDNs to integrate information compelling the male to terminate copulation. The long-term impact of this signaling is that the CDNs become gradually desensitized to motivating dopamine as the animal mates, making both current and future copulations increasingly prone to premature termination when challenged.Finally, I examine the timed progression of the many subcomponents of copulatory behavior. I identify a population of neurons that seem to affect all known aspects of copulation and argue that their role may be to serve as a master timekeeper that regulates the sequence and duration of each event.Together this work surveys how the motivation to mate evolves from the moment a juvenile fly ecloses, through the dynamics of a first mating, and after many mating experiences.
일반주제명  
Neurosciences
일반주제명  
Behavioral sciences
일반주제명  
Cognitive psychology
키워드  
Addiction
키워드  
D2 receptor
키워드  
Dopamine
키워드  
Drosophila
키워드  
Behavioral choices
기타저자  
Harvard University Medical Sciences
기본자료저록  
Dissertations Abstracts International. 85-12B.
전자적 위치 및 접속  
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MARC

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■1001  ▼aMiner,  Lauren  Elizabeth.▼0(orcid)0000-0003-3756-3248
■24510▼aMotivational  Control  of  Drosophila  Copulation  Across  Timescales
■260    ▼a[Sl]▼bHarvard  University▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a400  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  85-12,  Section:  B.
■500    ▼aAdvisor:  Crickmore,  Michael  A.
■5021  ▼aThesis  (Ph.D.)--Harvard  University,  2024.
■520    ▼aBehavioral  choices  incorporate  information  obtained  over  vastly  different  timescales:  from  experiences  the  animal  had  days  or  even  years  ago,  to  real-time  information  about  the  environment  and  progress  of  a  behavior.  How  do  the  neurons  that  ultimately  make  the  choice  to  begin,  persist  in,  or  terminate  a  behavior  integrate  all  this  information?  The  relatively  simple  brain  of  the  fly  -  and  the  still  simpler  sexually  dimorphic  circuitry  that  controls  reproductive  behavior  -  presents  an  opportunity  to  gain  mechanistic  insight  into  how  behavior  is  calibrated  to  reflect  life  experience.Courtship  emerges  over  the  first  three  days  of  life  as  a  male  reaches  sexual  maturity.  Once  in  adulthood,  courtship  is  vigorous  until  the  animal  achieves  its  goal  of  copulation,  after  which  it  is  decreased  and  takes  three  days  to  recover.  I  show  that  the  similarity  between  these  timescales  is  no  coincidence:  hormones  take  advantage  of  the  same  neural  circuit  motifs  that  regulate  satiety  after  repeatedly  mating  to  implement  sexual  abstinence  in  adolescence.I  next  show  that  like  courtship,  the  motivation  to  copulate  is  changed  by  recent  mating  experience.  I  found  that  dopaminergic  neurons  in  the  ventral  nervous  system  signal  through  the  D2  receptor  to  the  ~8  Copulation  Decision  Neurons  (CDNs),  which  cause  mating  termination  when  pushed  past  threshold.  The  immediate  consequence  of  this  signaling  is  the  elevation  of  intracellular  CaMKII,  whose  activity  changes  the  ability  of  the  CDNs  to  integrate  information  compelling  the  male  to  terminate  copulation.  The  long-term  impact  of  this  signaling  is  that  the  CDNs  become  gradually  desensitized  to  motivating  dopamine  as  the  animal  mates,  making  both  current  and  future  copulations  increasingly  prone  to  premature  termination  when  challenged.Finally,  I  examine  the  timed  progression  of  the  many  subcomponents  of  copulatory  behavior.  I  identify  a  population  of  neurons  that  seem  to  affect  all  known  aspects  of  copulation  and  argue  that  their  role  may  be  to  serve  as  a  master  timekeeper  that  regulates  the  sequence  and  duration  of  each  event.Together  this  work  surveys  how  the  motivation  to  mate  evolves  from  the  moment  a  juvenile  fly  ecloses,  through  the  dynamics  of  a  first  mating,  and  after  many  mating  experiences.
■590    ▼aSchool  code:  0084.
■650  4▼aNeurosciences
■650  4▼aBehavioral  sciences
■650  4▼aCognitive  psychology
■653    ▼aAddiction
■653    ▼aD2  receptor
■653    ▼aDopamine
■653    ▼aDrosophila
■653    ▼aBehavioral  choices
■690    ▼a0317
■690    ▼a0602
■690    ▼a0633
■71020▼aHarvard  University▼bMedical  Sciences.
■7730  ▼tDissertations  Abstracts  International▼g85-12B.
■790    ▼a0084
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17161392▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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