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Regulation of Arabidopsis Stomatal Development and Patterning by the AGCVIII Kinase Family
Regulation of Arabidopsis Stomatal Development and Patterning by the AGCVIII Kinase Family
Regulation of Arabidopsis Stomatal Development and Patterning by the AGCVIII Kinase Family

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20250211151943
ISBN  
9798384217725
DDC  
574
저자명  
Spencer, Dirk Junior Jamal.
서명/저자  
Regulation of Arabidopsis Stomatal Development and Patterning by the AGCVIII Kinase Family
발행사항  
[Sl] : Stanford University, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
89 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-03, Section: A.
주기사항  
Advisor: Bergmann, Dominique;Feldman, Jessica;Shapiro, Lucy.
학위논문주기  
Thesis (Ph.D.)--Stanford University, 2024.
초록/해제  
요약With multicellularity has come additional capacity for cells to become functionally and structurally diverse; along with diversity comes a need for organization and patterning. The formation of distinct cell types is often linked to asymmetric cell divisions (ACDs) in which a cell divides to create daughters that differ in size, composition, proximity to signaling sources, and ultimately fate. Cortical cell polarity is an important feature of ACDs. In animal cells, the PAR proteins play an important role in establishing cortical polarity driving ACDs and axis formation, but they are conspicuously absent from plant genomes. Interestingly, we see the conservation of mechanistic logic cells used to build polarity complexes. For example, AGC kinases enforce or reinforce cell polarity in plants, animals, and fungi.The stomatal lineage of Arabidopsis thaliana presents us with a unique opportunity to understand how cell polarity and orchestrated cell divisions contribute to a robust developmental plan. Core to this process are the cortically polarized scaffolding proteins BREAKING OF ASYMMETRY IN THE STOMATAL LINEAGE (BASL) and the BREVIS RADIX family (BRXf). These novel, plant-specific proteins are required to ensure proper asymmetric divisions in stomatal lineage cells. Loss of BASL results in more symmetric divisions and an over-proliferation of epidermal cells of mixed identity. To further elucidate BASL/BRXf's ability to confer ACD competency to stomatal lineage cells, we, in collaboration with proteomics specialist Geert De Jager (VIB Belgium), did a protein interaction screen that yielded several interaction partners for BRXL2. Among the candidates identified in the assay were members of the plant-specific PIN-FORMED (PINs) family and members of the AGCVIII kinase family.In this thesis, I present genetic and cell biological data that support a novel role for the AGCVIII kinase D6PK in facilitating asymmetric cell division and asymmetric fate acquisition in the stomatal lineages through the BASL and BRXL2. D6PK is broadly expressed in the leaf and is present in stomatal lineage cells, mature pavement cells, and guard cells. Furthermore, D6PK is localized to the BASL/BRXf polarity complex in the stomatal lineage. Its polarization mirrors BASL and BRX proteins during asymmetric cell division in that the D6PK polar crescent is inherited by the larger daughter cell. Further, we show that D6PK is required for patterning stomata. Stomatal lineage cells in the d6pk012 triple mutant background divided excessively and occasionally acquired identical fates, resulting in paired guard cells. Known transcriptional regulators are also disrupted in d6pk012. Due to the nature of the phenotype, we speculated that D6PK might be a core member of the BASL/BRXf polarity complex or a regulator of polarity. D6PK and BASL polarity are mutually dependent, while D6PK maintained some ability to polarize in the brxqbackground.Interestingly, D6PK polarity did not require BASL in mature pavement cells and mid-vein cells. D6PK may regulate stomatal patterning through a PIN-independent mechanism that requires the phosphorylation of BASL but not BRXL2. In comparing root and shoot systems, we draw two conclusions: (1) the stomatal lineage polarity system diverges in function from the polarity system found in root vascular cells, and (2) D6PK may function similarly to AGC kinases in animal polarity systems. The appendix of this thesis explores D6PKs' relationship with cell signaling factors, additional interactors of BRXL2, and automated cell segmentation.
일반주제명  
Membranes
일반주제명  
Fungi
일반주제명  
Embryos
일반주제명  
Signal transduction
일반주제명  
Hair
일반주제명  
Behavior
일반주제명  
Plasma
일반주제명  
Hormones
일반주제명  
Cytoskeleton
일반주제명  
Cellulose
일반주제명  
Insects
일반주제명  
Families & family life
일반주제명  
Phosphorylation
일반주제명  
Yeast
일반주제명  
Lipids
일반주제명  
Stem cells
일반주제명  
Asymmetry
일반주제명  
Cellular biology
일반주제명  
Endocrinology
일반주제명  
Individual & family studies
기타저자  
Stanford University.
기본자료저록  
Dissertations Abstracts International. 86-03A.
전자적 위치 및 접속  
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MARC

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■035    ▼a(MiAaPQ)Stanfordkq100kz3466
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a574
■1001  ▼aSpencer,  Dirk  Junior  Jamal.
■24510▼aRegulation  of  Arabidopsis  Stomatal  Development  and  Patterning  by  the  AGCVIII  Kinase  Family
■260    ▼a[Sl]▼bStanford  University▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a89  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-03,  Section:  A.
■500    ▼aAdvisor:  Bergmann,  Dominique;Feldman,  Jessica;Shapiro,  Lucy.
■5021  ▼aThesis  (Ph.D.)--Stanford  University,  2024.
■520    ▼aWith  multicellularity  has  come  additional  capacity  for  cells  to  become  functionally  and  structurally  diverse;  along  with  diversity  comes  a  need  for  organization  and  patterning.  The  formation  of  distinct  cell  types  is  often  linked  to  asymmetric  cell  divisions  (ACDs)  in  which  a  cell  divides  to  create  daughters  that  differ  in  size,  composition,  proximity  to  signaling  sources,  and  ultimately  fate.  Cortical  cell  polarity  is  an  important  feature  of  ACDs.  In  animal  cells,  the  PAR  proteins  play  an  important  role  in  establishing  cortical  polarity  driving  ACDs  and  axis  formation,  but  they  are  conspicuously  absent  from  plant  genomes.  Interestingly,  we  see  the  conservation  of  mechanistic  logic  cells  used  to  build  polarity  complexes.  For  example,  AGC  kinases  enforce  or  reinforce  cell  polarity  in  plants,  animals,  and  fungi.The  stomatal  lineage  of  Arabidopsis  thaliana  presents  us  with  a  unique  opportunity  to  understand  how  cell  polarity  and  orchestrated  cell  divisions  contribute  to  a  robust  developmental  plan.  Core  to  this  process  are  the  cortically  polarized  scaffolding  proteins  BREAKING  OF  ASYMMETRY  IN  THE  STOMATAL  LINEAGE  (BASL)  and  the  BREVIS  RADIX  family  (BRXf).  These  novel,  plant-specific  proteins  are  required  to  ensure  proper  asymmetric  divisions  in  stomatal  lineage  cells.  Loss  of  BASL  results  in  more  symmetric  divisions  and  an  over-proliferation  of  epidermal  cells  of  mixed  identity.  To  further  elucidate  BASL/BRXf's  ability  to  confer  ACD  competency  to  stomatal  lineage  cells,  we,  in  collaboration  with  proteomics  specialist  Geert  De  Jager  (VIB  Belgium),  did  a  protein  interaction  screen  that  yielded  several  interaction  partners  for  BRXL2.  Among  the  candidates  identified  in  the  assay  were  members  of  the  plant-specific  PIN-FORMED  (PINs)  family  and  members  of  the  AGCVIII  kinase  family.In  this  thesis,  I  present  genetic  and  cell  biological  data  that  support  a  novel  role  for  the  AGCVIII  kinase  D6PK  in  facilitating  asymmetric  cell  division  and  asymmetric  fate  acquisition  in  the  stomatal  lineages  through  the  BASL  and  BRXL2.  D6PK  is  broadly  expressed  in  the  leaf  and  is  present  in  stomatal  lineage  cells,  mature  pavement  cells,  and  guard  cells.  Furthermore,  D6PK  is  localized  to  the  BASL/BRXf  polarity  complex  in  the  stomatal  lineage.  Its  polarization  mirrors  BASL  and  BRX  proteins  during  asymmetric  cell  division  in  that  the  D6PK  polar  crescent  is  inherited  by  the  larger  daughter  cell.  Further,  we  show  that  D6PK  is  required  for  patterning  stomata.  Stomatal  lineage  cells  in  the  d6pk012  triple  mutant  background  divided  excessively  and  occasionally  acquired  identical  fates,  resulting  in  paired  guard  cells.  Known  transcriptional  regulators  are  also  disrupted  in  d6pk012.  Due  to  the  nature  of  the  phenotype,  we  speculated  that  D6PK  might  be  a  core  member  of  the  BASL/BRXf  polarity  complex  or  a  regulator  of  polarity.  D6PK  and  BASL  polarity  are  mutually  dependent,  while  D6PK  maintained  some  ability  to  polarize  in  the  brxqbackground.Interestingly,  D6PK  polarity  did  not  require  BASL  in  mature  pavement  cells  and  mid-vein  cells.  D6PK  may  regulate  stomatal  patterning  through  a  PIN-independent  mechanism  that  requires  the  phosphorylation  of  BASL  but  not  BRXL2.  In  comparing  root  and  shoot  systems,  we  draw  two  conclusions:  (1)  the  stomatal  lineage  polarity  system  diverges  in  function  from  the  polarity  system  found  in  root  vascular  cells,  and  (2)  D6PK  may  function  similarly  to  AGC  kinases  in  animal  polarity  systems.  The  appendix  of  this  thesis  explores  D6PKs'  relationship  with  cell  signaling  factors,  additional  interactors  of  BRXL2,  and  automated  cell  segmentation.
■590    ▼aSchool  code:  0212.
■650  4▼aMembranes
■650  4▼aFungi
■650  4▼aEmbryos
■650  4▼aSignal  transduction
■650  4▼aHair
■650  4▼aBehavior
■650  4▼aPlasma
■650  4▼aHormones
■650  4▼aCytoskeleton
■650  4▼aCellulose
■650  4▼aInsects
■650  4▼aFamilies  &  family  life
■650  4▼aPhosphorylation
■650  4▼aYeast
■650  4▼aLipids
■650  4▼aStem  cells
■650  4▼aAsymmetry
■650  4▼aCellular  biology
■650  4▼aEndocrinology
■650  4▼aIndividual  &  family  studies
■690    ▼a0379
■690    ▼a0409
■690    ▼a0628
■71020▼aStanford  University.
■7730  ▼tDissertations  Abstracts  International▼g86-03A.
■790    ▼a0212
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17162191▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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