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Stochasticity, Conflicts, and Instability: Biological Strategies for Optimal Growth in a Complex Environment
Stochasticity, Conflicts, and Instability: Biological Strategies for Optimal Growth in a C...
Stochasticity, Conflicts, and Instability: Biological Strategies for Optimal Growth in a Complex Environment

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20250211151956
ISBN  
9798383226476
DDC  
574.191
저자명  
Huang, Dean.
서명/저자  
Stochasticity, Conflicts, and Instability: Biological Strategies for Optimal Growth in a Complex Environment
발행사항  
[Sl] : University of Washington, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
276 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-01, Section: B.
주기사항  
Advisor: Wiggins, Paul A.
학위논문주기  
Thesis (Ph.D.)--University of Washington, 2024.
초록/해제  
요약Life is complicated. Even in the bacterium Escherichia coli, cell proliferation is dependent on the maintenance of over 2000 small-molecule metabolites, as well as the synthesis of more than 600 essential proteins. In addition to the sheer scale of this regulatory challenge, the regulatory processes themselves are stochastic in nature. In recent decades, biologists have made great progress in developing a functional map of cellular metabolism, but the dynamics and regulatory behavior of cellular processes remain largely opaque.In this dissertation, I have aimed to develop a series of mathematical and experimental methods that form a foundational framework for investigating and characterizing cellular dynamics and robustness. I first use the behavior of exponential growth to establish a direct correspondence between stochastic and deterministic cell models, bridging the gap between experimental stochasticity and observed population demographics. Using this correspondence, I then introduce the method of lag-time analysis, which experimentally characterizes the in vivo dynamics of replication for an exponentially-growing bacterial population. We use the method to measure replication pauses down to the precision of seconds, replication fork velocity in units of base pairs per second, and temporal oscillations in fork velocity in three evolutionarily-divergent species. Next, I introduce the robustness-load trade-off model, which incorporates stochasticity and an asymmetric fitness landscape to predict a lower limit for transcription of essential genes, metabolic load balancing between transcription and translation, and a generic overabundance of essential proteins.In the final chapter, I describe some preliminary work on regulatory feedback dynamics. We predict that regulation is a strategy that the cell uses to maintain robustness, complementary to the overabundance strategy. We also find an oscillatory signature that agrees with the lag-time analysis results, and demonstrate a trade-off between feedback strength, speed of return to equilibrium, and network stability. Although this research is not yet complete, this chapter provides a road map for further analysis and experimental tests. My hope is that the emergent phenomena described in this dissertation provide a solid foundation for future work on cellular dynamics and regulation.
일반주제명  
Biophysics
일반주제명  
Physics
일반주제명  
Biology
키워드  
Complexity
키워드  
Conflicts
키워드  
Instability
키워드  
Metabolism
키워드  
Regulation
키워드  
Stochasticity
기타저자  
University of Washington Physics
기본자료저록  
Dissertations Abstracts International. 86-01B.
전자적 위치 및 접속  
로그인 후 원문을 볼 수 있습니다.

MARC

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■035    ▼a(MiAaPQ)AAI31329098
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a574.191
■1001  ▼aHuang,  Dean.
■24510▼aStochasticity,  Conflicts,  and  Instability:  Biological  Strategies  for  Optimal  Growth  in  a  Complex  Environment
■260    ▼a[Sl]▼bUniversity  of  Washington▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a276  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-01,  Section:  B.
■500    ▼aAdvisor:  Wiggins,  Paul  A.
■5021  ▼aThesis  (Ph.D.)--University  of  Washington,  2024.
■520    ▼aLife  is  complicated.  Even  in  the  bacterium  Escherichia  coli,  cell  proliferation  is  dependent  on  the  maintenance  of  over  2000  small-molecule  metabolites,  as  well  as  the  synthesis  of  more  than  600  essential  proteins.  In  addition  to  the  sheer  scale  of  this  regulatory  challenge,  the  regulatory  processes  themselves  are  stochastic  in  nature.  In  recent  decades,  biologists  have  made  great  progress  in  developing  a  functional  map  of  cellular  metabolism,  but  the  dynamics  and  regulatory  behavior  of  cellular  processes  remain  largely  opaque.In  this  dissertation,  I  have  aimed  to  develop  a  series  of  mathematical  and  experimental  methods  that  form  a  foundational  framework  for  investigating  and  characterizing  cellular  dynamics  and  robustness.  I  first  use  the  behavior  of  exponential  growth  to  establish  a  direct  correspondence  between  stochastic  and  deterministic  cell  models,  bridging  the  gap  between  experimental  stochasticity  and  observed  population  demographics.  Using  this  correspondence,  I  then  introduce  the  method  of  lag-time  analysis,  which  experimentally  characterizes  the  in  vivo  dynamics  of  replication  for  an  exponentially-growing  bacterial  population.  We  use  the  method  to  measure  replication  pauses  down  to  the  precision  of  seconds,  replication  fork  velocity  in  units  of  base  pairs  per  second,  and  temporal  oscillations  in  fork  velocity  in  three  evolutionarily-divergent  species.  Next,  I  introduce  the  robustness-load  trade-off  model,  which  incorporates  stochasticity  and  an  asymmetric  fitness  landscape  to  predict  a  lower  limit  for  transcription  of  essential  genes,  metabolic  load  balancing  between  transcription  and  translation,  and  a  generic  overabundance  of  essential  proteins.In  the  final  chapter,  I  describe  some  preliminary  work  on  regulatory  feedback  dynamics.  We  predict  that  regulation  is  a  strategy  that  the  cell  uses  to  maintain  robustness,  complementary  to  the  overabundance  strategy.  We  also  find  an  oscillatory  signature  that  agrees  with  the  lag-time  analysis  results,  and  demonstrate  a  trade-off  between  feedback  strength,  speed  of  return  to  equilibrium,  and  network  stability.  Although  this  research  is  not  yet  complete,  this  chapter  provides  a  road  map  for  further  analysis  and  experimental  tests.  My  hope  is  that  the  emergent  phenomena  described  in  this  dissertation  provide  a  solid  foundation  for  future  work  on  cellular  dynamics  and  regulation.
■590    ▼aSchool  code:  0250.
■650  4▼aBiophysics
■650  4▼aPhysics
■650  4▼aBiology
■653    ▼aComplexity
■653    ▼aConflicts
■653    ▼aInstability
■653    ▼aMetabolism
■653    ▼aRegulation
■653    ▼aStochasticity
■690    ▼a0786
■690    ▼a0605
■690    ▼a0306
■71020▼aUniversity  of  Washington▼bPhysics.
■7730  ▼tDissertations  Abstracts  International▼g86-01B.
■790    ▼a0250
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17162297▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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