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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 Challenges in Editing Transgenic Models
상세정보
- 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
- Gene editing
- 키워드
- Transgenes
- 기타저자
- University of Pennsylvania Cell and Molecular Biology
- 기본자료저록
- Dissertations Abstracts International. 85-12B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■007cr#unu||||||||
■020 ▼a9798382830322
■035 ▼a(MiAaPQ)AAI31238546
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a574
■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.


