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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 - [...
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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