서브메뉴
검색
Investigating the Role of Senataxin in the Maintenance of Genome Stability
Investigating the Role of Senataxin in the Maintenance of Genome Stability
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202103550
- ISBN
- 9798270236595
- DDC
- 574
- 저자명
- Wu, Tong.
- 서명/저자
- Investigating the Role of Senataxin in the Maintenance of Genome Stability
- 발행사항
- [Sl] : The Scripps Research Institute, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 160 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-06, Section: B.
- 주기사항
- Advisor: Wu, Xiaohua;Boddy, Michael N.
- 학위논문주기
- Thesis (Ph.D.)--The Scripps Research Institute, 2025.
- 초록/해제
- 요약DNA-RNA helicase Senataxin (SETX) is important for maintaining genome stability and SETX dysfunctions are linked with various human diseases. On the one hand, SETX limits transcription-coupled R-loop formation to avoid R-loop-associated DNA damage, such as transcription-replication conflicts (TRCs). On the other hand, SETX also restrains DNA-RNA hybrid accumulation at double-strand break (DSB) ends and therefore promotes faithful DSB repair through homologous recombination (HR). However, what pathways are involved in handling the consequences of SETX deficiency are poorly understood.In the first part of my study, I took advantage of EGFP-based reporter systems previously established in our lab to study the functions of SETX in DSB repair pathway regulation. As my results showed, DSB-associated R-loop accumulation resulting from SETX deficiency activated break-induced replication (BIR). I further characterized the pathway of BIR, which involves RAD52-XPF to replace MRE11 to initiate end resection in SETX-deficient cells. I also found the potential link between R-loop accumulation due to SETX inactivation and template switching, a special BIR-associated phenomenon contributing to chromosome rearrangement.In the second part of my study, I carried out a CRISPR screening to search for genes showing synthetic lethal effect with SETX and found the SMC5/6 complex to be essential for cell survival as a consequence of transcription-replication conflicts (TRCs) upon SETX loss. I further identified the BLM-TOP3A-RMI1-RMI2 (BTRR) complex and FANCM as the downstream effectors of SMC5/6 complex to activate FANCD2-mediated TRC rescue.In summary, this dissertation demonstrates how SETX inactivation leads to genome instability in two R-loop-related aspects: abnormal hyper-BIR causing mutation accumulation and persistent TRC causing replication stress. Given that SETX mutations are found in various human diseases, these results open up a promising direction for therapy in patients with SETX deficiency.
- 일반주제명
- Molecular biology
- 일반주제명
- Cellular biology
- 일반주제명
- Genetics
- 키워드
- Senataxin
- 기타저자
- The Scripps Research Institute Molecular Biology
- 기본자료저록
- Dissertations Abstracts International. 87-06B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
008260126s2025 us c eng d■001000017357711
■00520260202103550
■006m o d
■007cr#unu||||||||
■020 ▼a9798270236595
■035 ▼a(MiAaPQ)AAI32041738
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a574
■1001 ▼aWu, Tong.
■24510▼aInvestigating the Role of Senataxin in the Maintenance of Genome Stability
■260 ▼a[Sl]▼bThe Scripps Research Institute▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a160 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-06, Section: B.
■500 ▼aAdvisor: Wu, Xiaohua;Boddy, Michael N.
■5021 ▼aThesis (Ph.D.)--The Scripps Research Institute, 2025.
■520 ▼aDNA-RNA helicase Senataxin (SETX) is important for maintaining genome stability and SETX dysfunctions are linked with various human diseases. On the one hand, SETX limits transcription-coupled R-loop formation to avoid R-loop-associated DNA damage, such as transcription-replication conflicts (TRCs). On the other hand, SETX also restrains DNA-RNA hybrid accumulation at double-strand break (DSB) ends and therefore promotes faithful DSB repair through homologous recombination (HR). However, what pathways are involved in handling the consequences of SETX deficiency are poorly understood.In the first part of my study, I took advantage of EGFP-based reporter systems previously established in our lab to study the functions of SETX in DSB repair pathway regulation. As my results showed, DSB-associated R-loop accumulation resulting from SETX deficiency activated break-induced replication (BIR). I further characterized the pathway of BIR, which involves RAD52-XPF to replace MRE11 to initiate end resection in SETX-deficient cells. I also found the potential link between R-loop accumulation due to SETX inactivation and template switching, a special BIR-associated phenomenon contributing to chromosome rearrangement.In the second part of my study, I carried out a CRISPR screening to search for genes showing synthetic lethal effect with SETX and found the SMC5/6 complex to be essential for cell survival as a consequence of transcription-replication conflicts (TRCs) upon SETX loss. I further identified the BLM-TOP3A-RMI1-RMI2 (BTRR) complex and FANCM as the downstream effectors of SMC5/6 complex to activate FANCD2-mediated TRC rescue.In summary, this dissertation demonstrates how SETX inactivation leads to genome instability in two R-loop-related aspects: abnormal hyper-BIR causing mutation accumulation and persistent TRC causing replication stress. Given that SETX mutations are found in various human diseases, these results open up a promising direction for therapy in patients with SETX deficiency.
■590 ▼aSchool code: 1179.
■650 4▼aMolecular biology
■650 4▼aCellular biology
■650 4▼aGenetics
■653 ▼aTranscription-replication conflicts
■653 ▼aSenataxin
■653 ▼aDouble-strand break
■653 ▼aHomologous recombination
■690 ▼a0307
■690 ▼a0379
■690 ▼a0369
■690 ▼a0769
■71020▼aThe Scripps Research Institute▼bMolecular Biology.
■7730 ▼tDissertations Abstracts International▼g87-06B.
■790 ▼a1179
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17357711▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


