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A high-resolution view of meiotic recombination initiation in Saccharomyces cerevisiae- [electronic resource]
A high-resolution view of meiotic recombination initiation in Saccharomyces cerevisiae- [electronic resource]
상세정보
- 자료유형
- 학위논문(국외)
- 자관 청구기호
- 기본표목-개인명
- 표제와 책임표시사항
- A high-resolution view of meiotic recombination initiation in Saccharomyces cerevisiae - [electronic resource] / Zhu, Xuan.
- 발행, 배포, 간사 사항
- 형태사항
- 1 online resource(157 p)
- 일반주기
- Source: Dissertation Abstracts International, Volume: 77-02(E), Section: B.
- 일반주기
- Adviser: Scott Keeney.
- 학위논문주기
- Thesis (Ph.D.)--Weill Medical College of Cornell University, 2015.
- 요약 등 주기
- 요약Meiotic recombination initiates with DNA double-strand breaks (DSBs) made by Spo11. In Saccharomyces cerevisiae, many DSBs occur in "hotspots" coinciding with nucleosome-depleted gene promoters. Transcription factors (TFs) stimulate DSB formation in some hotspots, but TF roles are complex and variable between locations. Until now, available data for TF effects on global DSB patterns were of low spatial resolution and confined to a single TF. Here, I examine at high resolution the contributions of two TFs to genome-wide DSB distributions: Bas1, which was known to regulate DSB activity at some loci, and Ino4, for which some binding sites were known to be within strong DSB hotspots. I examined fine-scale DSB distributions in TF mutant strains by deep sequencing oligonucleotides that remain covalently bound to Spo11 as a byproduct of DSB formation, mapped Bas1 and Ino4 binding sites in meiotic cells, and evaluated chromatin structure around DSB hotspots. Our findings definitively support the hypothesis that TF control of DSB numbers is context-dependent and frequently indirect. TFs often affected the fine-scale distributions of DSBs within hotspots, and when seen, these effects paralleled effects on local chromatin structure. In contrast, changes in DSB frequencies in hotspots showed no obvious correlation with quantitative measures of chromatin accessibility or of histone H3 lysine 4 trimethylation levels. I also ruled out hotspot competition as a major source of indirect TF effects on DSB distributions. Thus, counter to prevailing models, roles of these TFs on DSB hotspot strength cannot be simply explained via chromatin "openness", histone modification, or compensatory interactions between adjacent hotspots.
- 요약 등 주기
- 요약In addition to TFs, meiotic DSB formation is regulated by factors involved in chromatin structure and modifications. The effect of some of these factors on DSB landscape has been examined by hybridizing DSB-associated DNAs on microarrays. However, the DSB maps generated by microarrays usually have relatively low resolution and high background. To overcome these limitations, I generated high-resolution meiotic DSB maps from mutants of PCH2, SIR2 and SET1. Analysis of these maps further supports the view that the global DSB landscape is shaped by a hierarchical combination of factors.
- 주제명부출표목-일반주제명
- 부출표목-단체명
- 기본자료저록
- Dissertation Abstracts International. 77-02B(E).
- 기본자료저록
- Dissertation Abstract International
- 전자적 위치 및 접속
- 원문정보보기
- 소장사항
-
20170404 2017
MARC
008170601s2015 us esm 001c eng■001MOKWON01255476
■00520170418121409
■007cr
■020 ▼a9781339111414
■035 ▼a(MiAaPQ)AAI3726437
■040 ▼aMiAaPQ▼cMiAaPQ
■090 ▼a전자도서(박사논문)
■1001 ▼aZhu, Xuan.
■24512▼aA high-resolution view of meiotic recombination initiation in Saccharomyces cerevisiae▼h[electronic resource]▼cZhu, Xuan.
■260 ▼a[Sl]▼bWeill Medical College of Cornell University▼c2015
■300 ▼a1 online resource(157 p)
■500 ▼aSource: Dissertation Abstracts International, Volume: 77-02(E), Section: B.
■500 ▼aAdviser: Scott Keeney.
■5021 ▼aThesis (Ph.D.)--Weill Medical College of Cornell University, 2015.
■520 ▼aMeiotic recombination initiates with DNA double-strand breaks (DSBs) made by Spo11. In Saccharomyces cerevisiae, many DSBs occur in "hotspots" coinciding with nucleosome-depleted gene promoters. Transcription factors (TFs) stimulate DSB formation in some hotspots, but TF roles are complex and variable between locations. Until now, available data for TF effects on global DSB patterns were of low spatial resolution and confined to a single TF. Here, I examine at high resolution the contributions of two TFs to genome-wide DSB distributions: Bas1, which was known to regulate DSB activity at some loci, and Ino4, for which some binding sites were known to be within strong DSB hotspots. I examined fine-scale DSB distributions in TF mutant strains by deep sequencing oligonucleotides that remain covalently bound to Spo11 as a byproduct of DSB formation, mapped Bas1 and Ino4 binding sites in meiotic cells, and evaluated chromatin structure around DSB hotspots. Our findings definitively support the hypothesis that TF control of DSB numbers is context-dependent and frequently indirect. TFs often affected the fine-scale distributions of DSBs within hotspots, and when seen, these effects paralleled effects on local chromatin structure. In contrast, changes in DSB frequencies in hotspots showed no obvious correlation with quantitative measures of chromatin accessibility or of histone H3 lysine 4 trimethylation levels. I also ruled out hotspot competition as a major source of indirect TF effects on DSB distributions. Thus, counter to prevailing models, roles of these TFs on DSB hotspot strength cannot be simply explained via chromatin "openness", histone modification, or compensatory interactions between adjacent hotspots.
■520 ▼aIn addition to TFs, meiotic DSB formation is regulated by factors involved in chromatin structure and modifications. The effect of some of these factors on DSB landscape has been examined by hybridizing DSB-associated DNAs on microarrays. However, the DSB maps generated by microarrays usually have relatively low resolution and high background. To overcome these limitations, I generated high-resolution meiotic DSB maps from mutants of PCH2, SIR2 and SET1. Analysis of these maps further supports the view that the global DSB landscape is shaped by a hierarchical combination of factors.
■590 ▼aSchool code: 0967.
■650 4▼aBiology
■690 ▼a0306
■71020▼aWeill Medical College of Cornell University▼bMolecular Biology.
■7730 ▼tDissertation Abstracts International▼g77-02B(E).
■773 ▼tDissertation Abstract International
■790 ▼a0967
■791 ▼aPh.D.
■792 ▼a2015
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T14491276▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
■980 ▼a20170404▼f2017



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