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Investigating the Impact of Site-Specific Replication Stress on Homologous Recombination
Investigating the Impact of Site-Specific Replication Stress on Homologous Recombination
Detailed Information
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211153046
- ISBN
- 9798346808220
- DDC
- 574
- 서명/저자
- Investigating the Impact of Site-Specific Replication Stress on Homologous Recombination
- 발행사항
- [Sl] : Columbia University, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 135 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-06, Section: B.
- 주기사항
- Advisor: Symington, Lorraine S.
- 학위논문주기
- Thesis (Ph.D.)--Columbia University, 2024.
- 초록/해제
- 요약Genomic instability is a hallmark of cancer that can be caused by various forms of DNA replication stress. Collision of the replication fork with obstacles ahead of the replication machinery can result in replication fork stalling and collapse. To overcome or bypass these obstacles and resume proper replication fork progression, the cell has various replication restart mechanisms involving homologous recombination (HR) that help preserve genome integrity and ensure cell survival. However, HR can also lead to genome rearrangements, particularly when recombination occurs between repetitive DNA sequences. The tandem duplicator phenotype found in breast and ovarian cancer is an example of a genome-wide instability configuration that has been associated with pathways related to homologous recombination and replication stress, but the exact mechanism of how these duplicated sequences are formed is not fully understood. To examine the molecular mechanisms regulating genome instability in response to replication stress, we have established a genetic system in Saccharomyces cerevisiae to detect recombination events that result in tandem duplications (TDs) and deletions. Using this system, we investigated the mechanisms of recombination upon site-specific replication fork stalling initiated by a protein-induced replication fork barrier. We have found that a Tus/Ter-induced fork block downstream of direct repeats results in an induction in recombination events resulting in TDs and deletions compared to spontaneous frequencies, and that these recombination events have specific genetic requirements. Mainly focusing on the recombination mechanisms generating Tus/Ter-induced TDs, we determined that formation of these TDs is dependent on Rad52, Rad51, the Mph1 translocase, and structure-selective endonucleases, and that these events appear to be enhanced by disruption of the MRX complex and sister chromatid cohesion. We also found that genetic requirements for recombination in response to fork stalling by a protein-DNA barrier are distinct from those involved in fork collapse at a nick. Taken together, these studies give insight into the mechanisms governing copy number variation in the context of replication fork stalling, which may ultimately provide a better understanding of how replication stress contributes to cancer and other diseases characterized by genome instability.
- 일반주제명
- Cellular biology
- 일반주제명
- Genetics
- 일반주제명
- Molecular biology
- 키워드
- Fork reversal
- 기타저자
- Columbia University Cellular Molecular and Biomedical Studies
- 기본자료저록
- Dissertations Abstracts International. 86-06B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520250211153046
■006m o d
■007cr#unu||||||||
■020 ▼a9798346808220
■035 ▼a(MiAaPQ)AAI31640873
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a574
■1001 ▼aTriplett, Marina K.
■24510▼aInvestigating the Impact of Site-Specific Replication Stress on Homologous Recombination
■260 ▼a[Sl]▼bColumbia University▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a135 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-06, Section: B.
■500 ▼aAdvisor: Symington, Lorraine S.
■5021 ▼aThesis (Ph.D.)--Columbia University, 2024.
■520 ▼aGenomic instability is a hallmark of cancer that can be caused by various forms of DNA replication stress. Collision of the replication fork with obstacles ahead of the replication machinery can result in replication fork stalling and collapse. To overcome or bypass these obstacles and resume proper replication fork progression, the cell has various replication restart mechanisms involving homologous recombination (HR) that help preserve genome integrity and ensure cell survival. However, HR can also lead to genome rearrangements, particularly when recombination occurs between repetitive DNA sequences. The tandem duplicator phenotype found in breast and ovarian cancer is an example of a genome-wide instability configuration that has been associated with pathways related to homologous recombination and replication stress, but the exact mechanism of how these duplicated sequences are formed is not fully understood. To examine the molecular mechanisms regulating genome instability in response to replication stress, we have established a genetic system in Saccharomyces cerevisiae to detect recombination events that result in tandem duplications (TDs) and deletions. Using this system, we investigated the mechanisms of recombination upon site-specific replication fork stalling initiated by a protein-induced replication fork barrier. We have found that a Tus/Ter-induced fork block downstream of direct repeats results in an induction in recombination events resulting in TDs and deletions compared to spontaneous frequencies, and that these recombination events have specific genetic requirements. Mainly focusing on the recombination mechanisms generating Tus/Ter-induced TDs, we determined that formation of these TDs is dependent on Rad52, Rad51, the Mph1 translocase, and structure-selective endonucleases, and that these events appear to be enhanced by disruption of the MRX complex and sister chromatid cohesion. We also found that genetic requirements for recombination in response to fork stalling by a protein-DNA barrier are distinct from those involved in fork collapse at a nick. Taken together, these studies give insight into the mechanisms governing copy number variation in the context of replication fork stalling, which may ultimately provide a better understanding of how replication stress contributes to cancer and other diseases characterized by genome instability.
■590 ▼aSchool code: 0054.
■650 4▼aCellular biology
■650 4▼aGenetics
■650 4▼aMolecular biology
■653 ▼aFork reversal
■653 ▼aHomologous recombination
■653 ▼aReplication stress
■653 ▼aTandem duplications
■690 ▼a0379
■690 ▼a0369
■690 ▼a0307
■71020▼aColumbia University▼bCellular, Molecular and Biomedical Studies.
■7730 ▼tDissertations Abstracts International▼g86-06B.
■790 ▼a0054
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17164788▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
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