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Fat and Dachsous Regulate Growth Rate and Relative Size in Drosophila Wings
Fat and Dachsous Regulate Growth Rate and Relative Size in Drosophila Wings
Fat and Dachsous Regulate Growth Rate and Relative Size in Drosophila Wings

Detailed Information

자료유형  
 학위논문 서양
최종처리일시  
20250211150957
ISBN  
9798381975109
DDC  
574
저자명  
Liu, Andrew.
서명/저자  
Fat and Dachsous Regulate Growth Rate and Relative Size in Drosophila Wings
발행사항  
[Sl] : Northwestern University, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
226 p
주기사항  
Source: Dissertations Abstracts International, Volume: 85-10, Section: B.
주기사항  
Advisor: Carthew, Richard.
학위논문주기  
Thesis (Ph.D.)--Northwestern University, 2024.
초록/해제  
요약Growth control is a fundamental aspect of developmental biology. Organs have proper growth rates proportional to the body and standard final sizes to ensure form and function. In this thesis, I investigate the mechanism of growth control at the end of the larval stages in the Drosophila wing imaginal disc. The atypical cadherins Fat and Dachsous (Ds) are known tumor suppressors that signal through the Hippo pathway. Previous studies had characterized the overgrowth phenotype in fat and ds mutants and hypothesized that the graded Ds expression may control growth via the positional information model. This model suggests that cells can measure the local gradient of Ds, divide if the gradient is high, and stop growth if the gradient is below a certain threshold.Here, I quantitatively measured the growth rate of the wing disc, separating the wing pouch and notum, relative to the body in the third larval instar. I showed that the overgrowth in fat and ds mutants can be attributed to both increased growth rate and delayed growth cessation. The duration of the cell cycle increased linearly with wing size. I showed that Fat-Ds signaling enhances the rate at which the cell cycle lengthens with wing size, thus diminishing the linear rate of wing growth. Finally, I examined the dynamics of Fat and Ds protein distribution in the wing, observing graded distributions that change during growth. Unexpectedly, I found a graded Fat expression pattern that gradually shallows and completely flattens as growth ends. Contrarily, the graded Ds expression pattern was size invariant. Therefore, I hypothesize that Fat is the actual candidate for the positional information model in growth control of the wing pouch.
일반주제명  
Molecular biology
일반주제명  
Developmental biology
일반주제명  
Physiology
키워드  
Growth control
키워드  
Fat expression pattern
키워드  
Drosophila wings
기타저자  
Northwestern University Interdepartmental Biological Sciences (IBiS) Graduate Program
기본자료저록  
Dissertations Abstracts International. 85-10B.
전자적 위치 및 접속  
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MARC

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■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a574
■1001  ▼aLiu,  Andrew.
■24510▼aFat  and  Dachsous  Regulate  Growth  Rate  and  Relative  Size  in  Drosophila  Wings
■260    ▼a[Sl]▼bNorthwestern  University▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a226  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  85-10,  Section:  B.
■500    ▼aAdvisor:  Carthew,  Richard.
■5021  ▼aThesis  (Ph.D.)--Northwestern  University,  2024.
■520    ▼aGrowth  control  is  a  fundamental  aspect  of  developmental  biology.  Organs  have  proper  growth  rates  proportional  to  the  body  and  standard  final  sizes  to  ensure  form  and  function.  In  this  thesis,  I  investigate  the  mechanism  of  growth  control  at  the  end  of  the  larval  stages  in  the  Drosophila  wing  imaginal  disc.  The  atypical  cadherins  Fat  and  Dachsous  (Ds)  are  known  tumor  suppressors  that  signal  through  the  Hippo  pathway.  Previous  studies  had  characterized  the  overgrowth  phenotype  in  fat  and  ds  mutants  and  hypothesized  that  the  graded  Ds  expression  may  control  growth  via  the  positional  information  model.  This  model  suggests  that  cells  can  measure  the  local  gradient  of  Ds,  divide  if  the  gradient  is  high,  and  stop  growth  if  the  gradient  is  below  a  certain  threshold.Here,  I  quantitatively  measured  the  growth  rate  of  the  wing  disc,  separating  the  wing  pouch  and  notum,  relative  to  the  body  in  the  third  larval  instar.  I  showed  that  the  overgrowth  in  fat  and  ds  mutants  can  be  attributed  to  both  increased  growth  rate  and  delayed  growth  cessation.  The  duration  of  the  cell  cycle  increased  linearly  with  wing  size.  I  showed  that  Fat-Ds  signaling  enhances  the  rate  at  which  the  cell  cycle  lengthens  with  wing  size,  thus  diminishing  the  linear  rate  of  wing  growth.  Finally,  I  examined  the  dynamics  of  Fat  and  Ds  protein  distribution  in  the  wing,  observing  graded  distributions  that  change  during  growth.  Unexpectedly,  I  found  a  graded  Fat  expression  pattern  that  gradually  shallows  and  completely  flattens  as  growth  ends.  Contrarily,  the  graded  Ds  expression  pattern  was  size  invariant.  Therefore,  I  hypothesize  that  Fat  is  the  actual  candidate  for  the  positional  information  model  in  growth  control  of  the  wing  pouch.
■590    ▼aSchool  code:  0163.
■650  4▼aMolecular  biology
■650  4▼aDevelopmental  biology
■650  4▼aPhysiology
■653    ▼aGrowth  control
■653    ▼aFat  expression  pattern
■653    ▼aDrosophila  wings
■690    ▼a0307
■690    ▼a0758
■690    ▼a0719
■71020▼aNorthwestern  University▼bInterdepartmental  Biological  Sciences  (IBiS)  Graduate  Program.
■7730  ▼tDissertations  Abstracts  International▼g85-10B.
■790    ▼a0163
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17160324▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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