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Genetic and Evolutionary Basis of Behavioral Variability in Drosophila melanogaster
Genetic and Evolutionary Basis of Behavioral Variability in Drosophila melanogaster
Genetic and Evolutionary Basis of Behavioral Variability in Drosophila melanogaster

Detailed Information

자료유형  
 학위논문 서양
최종처리일시  
20260202105145
ISBN  
9798265410122
DDC  
574
저자명  
Lall, Shraddha.
서명/저자  
Genetic and Evolutionary Basis of Behavioral Variability in Drosophila melanogaster
발행사항  
[Sl] : Harvard University, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
273 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-05, Section: B.
주기사항  
Advisor: de Bivort, Benjamin.
학위논문주기  
Thesis (Ph.D.)--Harvard University, 2025.
초록/해제  
요약Behavioral individuality is a ubiquitous phenomenon. Animals from genetically homogeneous populations reared in identical environments display persistent and variable behavioral phenotypes. This behavioral variability can be heritable and potentially adaptive through a bet-hedging strategy, wherein genotypes that produce a range of behavioral phenotypes enhance their long term fitness in unpredictably fluctuating environments by increasing the probability that some individuals will express traits well-suited to the current conditions. In this dissertation, I investigate the genetic and evolutionary basis of behavioral variability in Drosophila melanogaster, combining theoretical modeling with experimental approaches to test its evolvability and underlying mechanisms.In Chapter 1, I develop a computational model to examine how variability responds to artificial selection. I compare family-based and individual-based selection strategies and show that family-based selection, where variability is measured across related individuals, is more effective than individual-based selection when the trait under selection is variance-based but not when it is mean-based. I further explore how population size, genetic architecture, and selection strength shape evolutionary outcomes. In Chapter 2, I apply these insights in a 21-generation artificial selection in fruit flies experiment targeting increased variability in locomotor handedness. I observe a consistent increase in behavioral variability over selection without a shift in mean turning bias. This evolved variability is polygenic and potentially has some sex-linked basis. I also identify changes in central complex morphology and correlated tradeoffs in mating success. In Chapter 3, we shift focus to thermal preference, an ecologically relevant behavior. Using a panel of inbred lines, we show that the mean and variability of thermal preference are both heritable, and genetically independent. Genome-wide association implicates spag, a co-chaperone of Hsp90, as a regulator of thermal preference variability. In Chapter 4, we investigate the genetic basis of the offspring number-body weight tradeoff using a composite offspring index. We identify candidate genes influencing this tradeoff and demonstrate through functional experiments that specific mutations alter the balance between offspring size and number. In the concluding chapter, I outline future directions, including experimental evolution approaches for studying bet-hedging. Together, this work shows that behavioral variability is an evolvable trait shaped by genetic and neuroanatomical factors.
일반주제명  
Biology
일반주제명  
Evolution & development
일반주제명  
Behavioral sciences
일반주제명  
Genetics
키워드  
Artificial selection
키워드  
Behavior
키워드  
Bet hedging
키워드  
Drosophila melanogaster
키워드  
Evolution
키워드  
Variability
기타저자  
Harvard University Biology Organismic and Evolutionary
기본자료저록  
Dissertations Abstracts International. 87-05B.
전자적 위치 및 접속  
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MARC

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■0820  ▼a574
■1001  ▼aLall,  Shraddha.
■24510▼aGenetic  and  Evolutionary  Basis  of  Behavioral  Variability  in  Drosophila  melanogaster
■260    ▼a[Sl]▼bHarvard  University▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a273  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-05,  Section:  B.
■500    ▼aAdvisor:  de  Bivort,  Benjamin.
■5021  ▼aThesis  (Ph.D.)--Harvard  University,  2025.
■520    ▼aBehavioral  individuality  is  a  ubiquitous  phenomenon.  Animals  from  genetically  homogeneous  populations  reared  in  identical  environments  display  persistent  and  variable  behavioral  phenotypes.  This  behavioral  variability  can  be  heritable  and  potentially  adaptive  through  a  bet-hedging  strategy,  wherein  genotypes  that  produce  a  range  of  behavioral  phenotypes  enhance  their  long  term  fitness  in  unpredictably  fluctuating  environments  by  increasing  the  probability  that  some  individuals  will  express  traits  well-suited  to  the  current  conditions.  In  this  dissertation,  I  investigate  the  genetic  and  evolutionary  basis  of  behavioral  variability  in  Drosophila  melanogaster,  combining  theoretical  modeling  with  experimental  approaches  to  test  its  evolvability  and  underlying  mechanisms.In  Chapter  1,  I  develop  a  computational  model  to  examine  how  variability  responds  to  artificial  selection.  I  compare  family-based  and  individual-based  selection  strategies  and  show  that  family-based  selection,  where  variability  is  measured  across  related  individuals,  is  more  effective  than  individual-based  selection  when  the  trait  under  selection  is  variance-based  but  not  when  it  is  mean-based.  I  further  explore  how  population  size,  genetic  architecture,  and  selection  strength  shape  evolutionary  outcomes.  In  Chapter  2,  I  apply  these  insights  in  a  21-generation  artificial  selection  in  fruit  flies  experiment  targeting  increased  variability  in  locomotor  handedness.  I  observe  a  consistent  increase  in  behavioral  variability  over  selection  without  a  shift  in  mean  turning  bias.  This  evolved  variability  is  polygenic  and  potentially  has  some  sex-linked  basis.  I  also  identify  changes  in  central  complex  morphology  and  correlated  tradeoffs  in  mating  success.  In  Chapter  3,  we  shift  focus  to  thermal  preference,  an  ecologically  relevant  behavior.  Using  a  panel  of  inbred  lines,  we  show  that  the  mean  and  variability  of  thermal  preference  are  both  heritable,  and  genetically  independent.  Genome-wide  association  implicates  spag,  a  co-chaperone  of  Hsp90,  as  a  regulator  of  thermal  preference  variability.  In  Chapter  4,  we  investigate  the  genetic  basis  of  the  offspring  number-body  weight  tradeoff  using  a  composite  offspring  index.  We  identify  candidate  genes  influencing  this  tradeoff  and  demonstrate  through  functional  experiments  that  specific  mutations  alter  the  balance  between  offspring  size  and  number.  In  the  concluding  chapter,  I  outline  future  directions,  including  experimental  evolution  approaches  for  studying  bet-hedging.  Together,  this  work  shows  that  behavioral  variability  is  an  evolvable  trait  shaped  by  genetic  and  neuroanatomical  factors.
■590    ▼aSchool  code:  0084.
■650  4▼aBiology
■650  4▼aEvolution  &  development
■650  4▼aBehavioral  sciences
■650  4▼aGenetics
■653    ▼aArtificial  selection
■653    ▼aBehavior
■653    ▼aBet  hedging
■653    ▼aDrosophila  melanogaster
■653    ▼aEvolution
■653    ▼aVariability
■690    ▼a0306
■690    ▼a0412
■690    ▼a0602
■690    ▼a0369
■71020▼aHarvard  University▼bBiology,  Organismic  and  Evolutionary.
■7730  ▼tDissertations  Abstracts  International▼g87-05B.
■790    ▼a0084
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17359608▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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