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Investigating the Role of Senataxin in the Maintenance of Genome Stability
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  
Transcription-replication conflicts
키워드  
Senataxin
키워드  
Double-strand break
키워드  
Homologous recombination
기타저자  
The Scripps Research Institute Molecular Biology
기본자료저록  
Dissertations Abstracts International. 87-06B.
전자적 위치 및 접속  
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■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.

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