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Investigating Novel Beta-Catenin Interactions in Wnt Target Gene Regulation in Human and Drosophila Cells
Investigating Novel Beta-Catenin Interactions in Wnt Target Gene Regulation in Human and D...
Investigating Novel Beta-Catenin Interactions in Wnt Target Gene Regulation in Human and Drosophila Cells

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20250211152104
ISBN  
9798382740935
DDC  
574
저자명  
Stewart, Richard.
서명/저자  
Investigating Novel Beta-Catenin Interactions in Wnt Target Gene Regulation in Human and Drosophila Cells
발행사항  
[Sl] : University of Michigan, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
127 p
주기사항  
Source: Dissertations Abstracts International, Volume: 85-12, Section: B.
주기사항  
Advisor: Cadigan, Kenneth M.
학위논문주기  
Thesis (Ph.D.)--University of Michigan, 2024.
초록/해제  
요약Activation of Wnt target genes requires the nuclear localization of β-catenin, a transcriptional co-regulator, to Wnt-regulated enhancers (WREs). β-catenin is recruited to WREs through direct binding to TCF-family transcription factors and mediates transcriptional activation by binding additional transcriptional co-activators. This process has traditionally been conceptualized through traditional mechanisms of protein-protein interaction. A recent study suggests that human β-catenin can form biomolecular condensates, which implies an alternative mechanism of protein-protein interaction and suggests that these condensates may be important for β-catenin's function as a transcriptional co-regulator. The primary focus of this thesis is to further examine the requirement of β-catenin condensate formation in regulating Wnt target genes by utilizing a variety of experimental readouts in Drosophila and human tissue.I characterized the transcriptional activity of a panel of β-catenin mutants which are defective in the ability to form biomolecular condensates. These mutants had different combinations of aromatic amino acid residues within β-catenin's terminal, intrinsically disordered regions (IDRs) mutated to alanine. The results of the experiments with these mutants support a model in which the ability of β-catenin to form biomolecular condensates is tightly linked to its ability to regulate Wnt target genes.A significant portion of my thesis work also focused on changes in the histone modification profile of Wnt target genes in response to Wnt activity. It has been previously observed that in response to Wnt signaling, Wnt target gene loci exhibit widespread histone acetylation. This is different from the general histone acetylation profile of active genes, which exhibit histone acetylation at cis-regulatory elements, such as enhancers and promoters. I sought to determine whether the widespread histone acetylation pattern emanated from a single WRE. To that end, I generated and characterized a Drosophila strain that had a WRE that regulates noutum, a Wnt target gene, deleted with CRISPR/Cas9. These flies still expressed noutum, suggesting that there are additional WREs that regulate noutum's expression. Additionally, we observed that histone acetylation is sufficient for transcription of the Wnt target gene, naked cuticle. Our results illustrate a complicated relationship between histone acetylation, WRE activity, and Wnt target gene transcription.In total, my dissertation research characterizes the role of β-catenin-containing biomolecular condensates and histone acetylation in Wnt target gene regulation. My work provides a strong functional characterization of biomolecular condensates in Wnt target gene regulation and foundational studies for the sufficiency of histone acetylation in Wnt target gene expression. Future studies aimed at elucidating a direct link between biomolecular condensates and Wnt target gene transcription, in addition to characterizing a biomolecular condensate 'grammar' with β-catenin and additional transcriptional co-regulators, will be important next steps for this work.
일반주제명  
Molecular biology
일반주제명  
Genetics
일반주제명  
Cellular biology
키워드  
Beta-catenin
키워드  
Transcription
키워드  
Wnt signaling
키워드  
Biomolecular condensate
키워드  
Histone acetylation
기타저자  
University of Michigan Molecular Cellular and Developmental Biology
기본자료저록  
Dissertations Abstracts International. 85-12B.
전자적 위치 및 접속  
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MARC

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■020    ▼a9798382740935
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■035    ▼a(MiAaPQ)umichrackham005527
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a574
■1001  ▼aStewart,  Richard.
■24510▼aInvestigating  Novel  Beta-Catenin  Interactions  in  Wnt  Target  Gene  Regulation  in  Human  and  Drosophila  Cells
■260    ▼a[Sl]▼bUniversity  of  Michigan▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a127  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  85-12,  Section:  B.
■500    ▼aAdvisor:  Cadigan,  Kenneth  M.
■5021  ▼aThesis  (Ph.D.)--University  of  Michigan,  2024.
■520    ▼aActivation  of  Wnt  target  genes  requires  the  nuclear  localization  of  β-catenin,  a  transcriptional  co-regulator,  to  Wnt-regulated  enhancers  (WREs).  β-catenin  is  recruited  to  WREs  through  direct  binding  to  TCF-family  transcription  factors  and  mediates  transcriptional  activation  by  binding  additional  transcriptional  co-activators.  This  process  has  traditionally  been  conceptualized  through  traditional  mechanisms  of  protein-protein  interaction.  A  recent  study  suggests  that  human  β-catenin  can  form  biomolecular  condensates,  which  implies  an  alternative  mechanism  of  protein-protein  interaction  and  suggests  that  these  condensates  may  be  important  for  β-catenin's  function  as  a  transcriptional  co-regulator.  The  primary  focus  of  this  thesis  is  to  further  examine  the  requirement  of  β-catenin  condensate  formation  in  regulating  Wnt  target  genes  by  utilizing  a  variety  of  experimental  readouts  in  Drosophila  and  human  tissue.I  characterized  the  transcriptional  activity  of  a  panel  of  β-catenin  mutants  which  are  defective  in  the  ability  to  form  biomolecular  condensates.  These  mutants  had  different  combinations  of  aromatic  amino  acid  residues  within  β-catenin's  terminal,  intrinsically  disordered  regions  (IDRs)  mutated  to  alanine.  The  results  of  the  experiments  with  these  mutants  support  a  model  in  which  the  ability  of  β-catenin  to  form  biomolecular  condensates  is  tightly  linked  to  its  ability  to  regulate  Wnt  target  genes.A  significant  portion  of  my  thesis  work  also  focused  on  changes  in  the  histone  modification  profile  of  Wnt  target  genes  in  response  to  Wnt  activity.  It  has  been  previously  observed  that  in  response  to  Wnt  signaling,  Wnt  target  gene  loci  exhibit  widespread  histone  acetylation.  This  is  different  from  the  general  histone  acetylation  profile  of  active  genes,  which  exhibit  histone  acetylation  at  cis-regulatory  elements,  such  as  enhancers  and  promoters.  I  sought  to  determine  whether  the  widespread  histone  acetylation  pattern  emanated  from  a  single  WRE.  To  that  end,  I  generated  and  characterized  a  Drosophila  strain  that  had  a  WRE  that  regulates  noutum,  a  Wnt  target  gene,  deleted  with  CRISPR/Cas9.  These  flies  still  expressed  noutum,  suggesting  that  there  are  additional  WREs  that  regulate  noutum's  expression.  Additionally,  we  observed  that  histone  acetylation  is  sufficient  for  transcription  of  the  Wnt  target  gene,  naked  cuticle.  Our  results  illustrate  a  complicated  relationship  between  histone  acetylation,  WRE  activity,  and  Wnt  target  gene  transcription.In  total,  my  dissertation  research  characterizes  the  role  of  β-catenin-containing  biomolecular  condensates  and  histone  acetylation  in  Wnt  target  gene  regulation.  My  work  provides  a  strong  functional  characterization  of  biomolecular  condensates  in  Wnt  target  gene  regulation  and  foundational  studies  for  the  sufficiency  of  histone  acetylation  in  Wnt  target  gene  expression.  Future  studies  aimed  at  elucidating  a  direct  link  between  biomolecular  condensates  and  Wnt  target  gene  transcription,  in  addition  to  characterizing  a  biomolecular  condensate  'grammar'  with  β-catenin  and  additional  transcriptional  co-regulators,  will  be  important  next  steps  for  this  work.
■590    ▼aSchool  code:  0127.
■650  4▼aMolecular  biology
■650  4▼aGenetics
■650  4▼aCellular  biology
■653    ▼aBeta-catenin
■653    ▼aTranscription
■653    ▼aWnt  signaling
■653    ▼aBiomolecular  condensate
■653    ▼aHistone  acetylation
■690    ▼a0307
■690    ▼a0369
■690    ▼a0379
■71020▼aUniversity  of  Michigan▼bMolecular,  Cellular,  and  Developmental  Biology.
■7730  ▼tDissertations  Abstracts  International▼g85-12B.
■790    ▼a0127
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17162857▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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