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Regulation of Somatic Cell Fate by Escargot in Drosophila Testis
Regulation of Somatic Cell Fate by Escargot in Drosophila Testis
Regulation of Somatic Cell Fate by Escargot in Drosophila Testis

Detailed Information

자료유형  
 학위논문 서양
최종처리일시  
20250211152000
ISBN  
9798382829777
DDC  
574
저자명  
Kryza, Jordan Ryan.
서명/저자  
Regulation of Somatic Cell Fate by Escargot in Drosophila Testis
발행사항  
[Sl] : University of California, Los Angeles, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
59 p
주기사항  
Source: Dissertations Abstracts International, Volume: 85-12, Section: B.
주기사항  
Advisor: Long, Jeffrey Aaron;Jones, D. Leanne.
학위논문주기  
Thesis (Ph.D.)--University of California, Los Angeles, 2024.
초록/해제  
요약Adult stem cells are crucial for tissue homeostasis and repair. Their fate is tightly regulated by intrinsic genetic factors and extrinsic cues within the stem cell niche. These niches are adaptable, responding to stimuli to maintain homeostasis, but the molecular details of this regulation are not fully understood. This study explores a mechanism that regulates the fate of somatic support cells in the Drosophila testis to maintain tissue homeostasis.The hub in the Drosophila testis niche secretes factors that regulate germline stem cells (GSCs) and cyst stem cells (CySCs). Our lab previously reported that the Snail family transcriptional regulator Escargot (Esg) is necessary for maintaining the identity of both CySCs and hub cells. Depleting esg from hub cells leads to their conversion into CySCs, resulting in the loss of both GSC and CySC populations. Similarly, esg depletion from early somatic cells causes CySCs to differentiate prematurely into daughter cyst cells. These findings indicate that Esg is central to determining somatic cell fates, although the mechanisms are not fully understood.In the adult testis, Egfr activity is low in hub cells under homeostatic conditions but active in CySCs and early cyst cells, regulating their differentiation. Interestingly, Esg protein levels are significantly higher in hub cells than in cyst cells. We hypothesized that Esg influences somatic cell fate by repressing the Egfr signaling cascade. Our results show that repressing Egfr signaling suppresses hub-to-CySC conversion upon esg depletion. Conversely, overexpressing esg in CySCs increases the number of early cyst cells and induces CySC-to-hub cell conversion, which depends on Egfr activity. Constitutive Egfr activation in CySCs prevents this conversion upon esg overexpression. These findings support the hypothesis that Escargot acts upstream of Egfr to regulate somatic cell identity and maintain tissue homeostasis in the testis.
일반주제명  
Cellular biology
일반주제명  
Genetics
일반주제명  
Molecular biology
키워드  
Drosophila
키워드  
Escargot
키워드  
Somatic cells
키워드  
Stem cell
키워드  
Genetic factors
기타저자  
University of California, Los Angeles Molecular Biology 0573
기본자료저록  
Dissertations Abstracts International. 85-12B.
전자적 위치 및 접속  
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MARC

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■020    ▼a9798382829777
■035    ▼a(MiAaPQ)AAI31329701
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a574
■1001  ▼aKryza,  Jordan  Ryan.
■24510▼aRegulation  of  Somatic  Cell  Fate  by  Escargot  in  Drosophila  Testis
■260    ▼a[Sl]▼bUniversity  of  California,  Los  Angeles▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a59  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  85-12,  Section:  B.
■500    ▼aAdvisor:  Long,  Jeffrey  Aaron;Jones,  D.  Leanne.
■5021  ▼aThesis  (Ph.D.)--University  of  California,  Los  Angeles,  2024.
■520    ▼aAdult  stem  cells  are  crucial  for  tissue  homeostasis  and  repair.  Their  fate  is  tightly  regulated  by  intrinsic  genetic  factors  and  extrinsic  cues  within  the  stem  cell  niche.  These  niches  are  adaptable,  responding  to  stimuli  to  maintain  homeostasis,  but  the  molecular  details  of  this  regulation  are  not  fully  understood.  This  study  explores  a  mechanism  that  regulates  the  fate  of  somatic  support  cells  in  the  Drosophila  testis  to  maintain  tissue  homeostasis.The  hub  in  the  Drosophila  testis  niche  secretes  factors  that  regulate  germline  stem  cells  (GSCs)  and  cyst  stem  cells  (CySCs).  Our  lab  previously  reported  that  the  Snail  family  transcriptional  regulator  Escargot  (Esg)  is  necessary  for  maintaining  the  identity  of  both  CySCs  and  hub  cells.  Depleting  esg  from  hub  cells  leads  to  their  conversion  into  CySCs,  resulting  in  the  loss  of  both GSC  and  CySC  populations.  Similarly,  esg  depletion  from  early  somatic  cells  causes  CySCs  to  differentiate  prematurely  into  daughter  cyst  cells.  These  findings  indicate  that  Esg  is  central  to  determining  somatic  cell  fates,  although  the  mechanisms  are  not  fully  understood.In  the  adult  testis,  Egfr  activity  is  low  in  hub  cells  under  homeostatic  conditions  but  active  in  CySCs  and  early  cyst  cells,  regulating  their  differentiation.  Interestingly,  Esg  protein  levels  are  significantly  higher  in  hub  cells  than  in  cyst  cells.  We  hypothesized  that  Esg  influences  somatic  cell  fate  by  repressing  the  Egfr  signaling  cascade.  Our  results  show  that  repressing  Egfr  signaling  suppresses  hub-to-CySC  conversion  upon  esg  depletion.  Conversely,  overexpressing  esg  in  CySCs  increases  the  number  of  early  cyst  cells  and  induces  CySC-to-hub  cell  conversion,  which  depends  on  Egfr  activity.  Constitutive  Egfr  activation  in  CySCs  prevents  this  conversion  upon  esg  overexpression.  These  findings  support  the  hypothesis  that  Escargot  acts  upstream  of  Egfr  to  regulate  somatic  cell  identity  and  maintain  tissue  homeostasis  in  the  testis.
■590    ▼aSchool  code:  0031.
■650  4▼aCellular  biology
■650  4▼aGenetics
■650  4▼aMolecular  biology
■653    ▼aDrosophila
■653    ▼aEscargot
■653    ▼aSomatic  cells
■653    ▼aStem  cell
■653    ▼aGenetic  factors
■690    ▼a0379
■690    ▼a0369
■690    ▼a0307
■71020▼aUniversity  of  California,  Los  Angeles▼bMolecular  Biology  0573.
■7730  ▼tDissertations  Abstracts  International▼g85-12B.
■790    ▼a0031
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17162329▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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