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Gene Editing Strategies for Spinocerebellar Ataxia Type 1: Therapeutic Applications and Challenges in Editing Transgenic Models
Gene Editing Strategies for Spinocerebellar Ataxia Type 1: Therapeutic Applications and Ch...
Gene Editing Strategies for Spinocerebellar Ataxia Type 1: Therapeutic Applications and Challenges in Editing Transgenic Models

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자료유형  
 학위논문 서양
최종처리일시  
20250211151316
ISBN  
9798382830322
DDC  
574
저자명  
Fagan, Kelly.
서명/저자  
Gene Editing Strategies for Spinocerebellar Ataxia Type 1: Therapeutic Applications and Challenges in Editing Transgenic Models
발행사항  
[Sl] : University of Pennsylvania, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
121 p
주기사항  
Source: Dissertations Abstracts International, Volume: 85-12, Section: B.
주기사항  
Advisor: Davidson, Beverly L.
학위논문주기  
Thesis (Ph.D.)--University of Pennsylvania, 2024.
초록/해제  
요약Spinocerebellar ataxia type 1 (SCA1) is an autosomal dominant neurodegenerative disease that causes progressive loss of motor coordination, respiratory issues, and eventual death. SCA1 is caused by expansion of the polyglutamine repeat region in the ATXN1 gene. Although mutant ATXN1 is expressed ubiquitously, it affects primarily Purkinje cells (PCs). Currently there are no disease modifying treatments; however, previous work has shown the potential of gene therapy, specifically RNAi, as a potential modality. Genome editing offers a possible treatment for these patients but has yet to be evaluated in SCA1 models. I hypothesize that Clustered Regularly Interspaced Short Palidromic Repeats (CRISPR)-Cas editing will reduce ATXN1 and be therapeutically beneficial. To test this, I first selected gene editing strategies in vitro and investigated multiple mouse models to identify an optimal in vivo system. I found my single gRNA strategy targeting at the exon-exon junction and a dual gRNA strategy flanking the CAG repeat region reduced ATXN1 levels by approximately 56% in HEK293 cells. I performed two behavior studies in mice modeling SCA1 with expanded ATXN1 CAG repeats. Though the first attempt was unsuccessful, I leveraged the data collected to alter multiple aspects of our strategy such as timing of delivery and the mouse model used. During characterization of mouse models, I assessed the number of transgenes harbored in the B05 model of SCA1. Despite having 5 copies of the human mutant transgene, the single gRNA strategy led to a 20% reduction of ATXN1. This resulted in amelioration of behavior deficits without increases in inflammatory markers; however, I did not observe rescue of molecular pathology. Importantly, the editing outcomes were consistent in induced pluripotent stem cells (iPSC) neurons derived from patients with SCA1, promoting the translatability of the approach to patients. I confirmed dual gRNA editing in mice but saw a low deletion frequency; less than 1% of the ATXN1 loci evaluated had a full-length deletion. This thesis successfully demonstrates the validity of a Cas9 meditated therapeutic approach for SCA1 while simultaneously highlighting the difficulties in transgenic animal models faithfully representing gene editing outcomes.
일반주제명  
Molecular biology
일반주제명  
Cellular biology
일반주제명  
Neurosciences
일반주제명  
Genetics
키워드  
Spinocerebellar ataxia type 1
키워드  
Gene editing
키워드  
Neurodegenerative disease
키워드  
Transgenic animal models
키워드  
Transgenes
기타저자  
University of Pennsylvania Cell and Molecular Biology
기본자료저록  
Dissertations Abstracts International. 85-12B.
전자적 위치 및 접속  
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MARC

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■1001  ▼aFagan,  Kelly.
■24510▼aGene  Editing  Strategies  for  Spinocerebellar  Ataxia  Type  1:  Therapeutic  Applications  and  Challenges  in  Editing  Transgenic  Models
■260    ▼a[Sl]▼bUniversity  of  Pennsylvania▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a121  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  85-12,  Section:  B.
■500    ▼aAdvisor:  Davidson,  Beverly  L.
■5021  ▼aThesis  (Ph.D.)--University  of  Pennsylvania,  2024.
■520    ▼aSpinocerebellar  ataxia  type  1  (SCA1)  is  an  autosomal  dominant  neurodegenerative  disease  that  causes  progressive  loss  of  motor  coordination,  respiratory  issues,  and  eventual  death.  SCA1  is  caused  by  expansion  of  the  polyglutamine  repeat  region  in  the  ATXN1  gene.  Although  mutant  ATXN1  is  expressed  ubiquitously,  it  affects  primarily  Purkinje  cells  (PCs).  Currently  there  are  no  disease  modifying  treatments;  however,  previous  work  has  shown  the  potential  of  gene  therapy,  specifically  RNAi,  as  a  potential  modality.  Genome  editing  offers  a  possible  treatment  for  these  patients  but  has  yet  to  be  evaluated  in  SCA1  models.  I  hypothesize  that  Clustered  Regularly  Interspaced  Short  Palidromic  Repeats  (CRISPR)-Cas  editing  will  reduce  ATXN1  and  be  therapeutically  beneficial.  To  test  this,  I  first  selected  gene  editing  strategies  in  vitro  and  investigated  multiple  mouse  models  to  identify  an  optimal  in  vivo  system.  I  found  my  single  gRNA  strategy  targeting  at  the  exon-exon  junction  and  a  dual  gRNA  strategy  flanking  the  CAG  repeat  region  reduced  ATXN1  levels  by  approximately  56%  in  HEK293  cells.  I  performed  two  behavior  studies  in  mice  modeling  SCA1  with  expanded  ATXN1  CAG  repeats.  Though  the  first  attempt  was  unsuccessful,  I  leveraged  the  data  collected  to  alter  multiple  aspects  of  our  strategy  such  as  timing  of  delivery  and  the  mouse  model  used.  During  characterization  of  mouse  models,  I  assessed  the  number  of  transgenes  harbored  in  the  B05  model  of  SCA1.  Despite  having  5  copies  of  the  human  mutant  transgene,  the  single  gRNA  strategy  led  to  a  20%  reduction  of  ATXN1.  This  resulted  in  amelioration  of  behavior  deficits  without  increases  in  inflammatory  markers;  however,  I  did  not  observe  rescue  of  molecular  pathology.  Importantly,  the  editing  outcomes  were  consistent  in  induced  pluripotent  stem  cells  (iPSC)  neurons  derived  from  patients  with  SCA1,  promoting  the  translatability  of  the  approach  to  patients.  I  confirmed  dual  gRNA  editing  in  mice  but  saw  a  low  deletion  frequency;  less  than  1%  of  the  ATXN1  loci  evaluated  had  a  full-length  deletion.  This  thesis  successfully  demonstrates  the  validity  of  a  Cas9  meditated  therapeutic  approach  for  SCA1  while  simultaneously  highlighting  the  difficulties  in  transgenic  animal  models  faithfully  representing  gene  editing  outcomes.
■590    ▼aSchool  code:  0175.
■650  4▼aMolecular  biology
■650  4▼aCellular  biology
■650  4▼aNeurosciences
■650  4▼aGenetics
■653    ▼aSpinocerebellar  ataxia  type  1
■653    ▼aGene  editing
■653    ▼aNeurodegenerative  disease
■653    ▼aTransgenic  animal  models
■653    ▼aTransgenes
■690    ▼a0307
■690    ▼a0379
■690    ▼a0317
■690    ▼a0369
■71020▼aUniversity  of  Pennsylvania▼bCell  and  Molecular  Biology.
■7730  ▼tDissertations  Abstracts  International▼g85-12B.
■790    ▼a0175
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17161149▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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