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Computational Frameworks for Improved Interpretability of Allele Specific Expression Data
Computational Frameworks for Improved Interpretability of Allele Specific Expression Data
Computational Frameworks for Improved Interpretability of Allele Specific Expression Data

Detailed Information

자료유형  
 학위논문 서양
최종처리일시  
20260202104709
ISBN  
9798293829613
DDC  
574
저자명  
Ganapathy, Kaushik Ram.
서명/저자  
Computational Frameworks for Improved Interpretability of Allele Specific Expression Data
발행사항  
[Sl] : The Scripps Research Institute, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
472 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-03, Section: B.
주기사항  
Includes supplementary digital materials.
주기사항  
Advisor: Torkamani, Ali;Wu, Chunlei.
학위논문주기  
Thesis (Ph.D.)--The Scripps Research Institute, 2025.
초록/해제  
요약The functional interpretation of rare genetic variation remains a critical bottleneck in genomic medicine. While advances in DNA-sequencing through the emergence of next-generation sequencing (NGS) technologies have enabled the comprehensive discovery of genetic variants across population and disease cohorts, many deleterious rare variants elude confident classification. This ambiguity is especially problematic in clinically unsolved or phenotypically heterogeneous cohorts, where genome-first diagnostic approaches often fall short.  Transcriptome sequencing (RNA-seq) provides an orthogonal vantage point by capturing the downstream transcriptional consequences of genetic variation in native tissue contexts. Among transcriptome-derived molecular phenotypes, allele-specific expression (ASE)-which quantifies the relative expression of alleles at heterozygous loci-has emerged as a uniquely sensitive readout of cis-regulatory perturbation, capable of detecting dosage imbalance and transcript instability in vivo.Despite its conceptual utility, ASE remains underutilized in both research and diagnostic settings due to key analytical and practical limitations. ASE measurements are acutely susceptible to technical confounders, including RNA degradation, contamination, and mapping bias-artifacts not adequately addressed by conventional quality control procedures designed for total expression analysis. Further, most analytical frameworks reduce ASE to a single informative SNP per gene, discarding valuable multi-locus information. Critically, while ASE-based outlier detection has shown promise in phenotypically uniform rare disease cohorts (e.g., mitochondrial disorders, heart and muscular disease), it has not been systematically extended to unsolved, phenotypically diverse cohorts-where existing interpretation frameworks are least effective.First, I introduce the first dedicated quality control framework for allele-specific expression in large-scale RNA-seq data. Applied to over 15,000 GTEx samples, it uncovers previously unrecognized temporal batch effects that distort ASE and splicing signals, ultimately impairing the interpretation of rare regulatory variants.Second, I introduce an outlier detection platform that leverages haplotype-aware ASE by aggregating allelic signal across phased heterozygous variants within genes, allowing for robust detection of aberrant expression imbalance while accounting for expected allelic variance within the general population. Applied to GTEx and the Multi-Ancestry Gene Expression (MAGE) dataset, this method doubles the number of genes amenable to ASE outlier detection across tissues and further enables the discovery of ancestry-stratified patterns of regulatory constraint. Benchmarking in known rare mendelian muscular disease cohorts confirms improved sensitivity to functional regulatory variation.Finally, to demonstrate translational impact of these frameworks, I apply these frameworks to a cohort of 35 molecular autopsy patients, each of whom died of sudden unexplained death. Analysis of ASE data obtained from cardiac tissue identified rare variants exhibiting significant allelic imbalance and transcriptional signatures indicative of pathophysiologic processes in three previously unsolved cases ultimately leading to improved variant prioritization. These results underscore the utility of ASE-based methods for resolving cryptic genetic etiologies in phenotypically heterogeneous cases.The aim of this dissertation is to advance ASE from a descriptive signal to a robust, scalable, and interpretable transcriptional phenotype with broad utility in variant interpretation. Through the development of ASE quality control, haplotype-level outlier detection, and integrative clinical application, this dissertation provides a generalizable framework for leveraging transcriptomic allelic imbalance to functionally annotate rare genetic variation and improve diagnostic yield in the context of precision medicine.
일반주제명  
Bioinformatics
일반주제명  
Computer science
일반주제명  
Statistics
일반주제명  
Medicine
일반주제명  
Biostatistics
일반주제명  
Genetics
키워드  
Allele-specific expression
키워드  
DNA-seq
키워드  
RNA -seq
키워드  
Statistical modelling
키워드  
Transcriptomics
기타저자  
The Scripps Research Institute Computational Biology/Bioinformatics
기본자료저록  
Dissertations Abstracts International. 87-03B.
전자적 위치 및 접속  
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MARC

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■1001  ▼aGanapathy,  Kaushik  Ram.
■24510▼aComputational  Frameworks  for  Improved  Interpretability  of  Allele  Specific  Expression  Data
■260    ▼a[Sl]▼bThe  Scripps  Research  Institute▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a472  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-03,  Section:  B.
■500    ▼aIncludes  supplementary  digital  materials.
■500    ▼aAdvisor:  Torkamani,  Ali;Wu,  Chunlei.
■5021  ▼aThesis  (Ph.D.)--The  Scripps  Research  Institute,  2025.
■520    ▼aThe  functional  interpretation  of  rare  genetic  variation  remains  a  critical  bottleneck  in  genomic  medicine.  While  advances  in  DNA-sequencing  through  the  emergence  of  next-generation  sequencing  (NGS)  technologies  have  enabled  the  comprehensive  discovery  of  genetic  variants  across  population  and  disease  cohorts,  many  deleterious  rare  variants  elude  confident  classification.  This  ambiguity  is  especially  problematic  in  clinically  unsolved  or  phenotypically  heterogeneous  cohorts,  where  genome-first  diagnostic  approaches  often  fall  short.  Transcriptome  sequencing  (RNA-seq)  provides  an  orthogonal  vantage  point  by  capturing  the  downstream  transcriptional  consequences  of  genetic  variation  in  native  tissue  contexts.  Among  transcriptome-derived  molecular  phenotypes,  allele-specific  expression  (ASE)-which  quantifies  the  relative  expression  of  alleles  at  heterozygous  loci-has  emerged  as  a  uniquely  sensitive  readout  of  cis-regulatory  perturbation,  capable  of  detecting  dosage  imbalance  and  transcript  instability  in  vivo.Despite  its  conceptual  utility,  ASE  remains  underutilized  in  both  research  and  diagnostic  settings  due  to  key  analytical  and  practical  limitations.  ASE  measurements  are  acutely  susceptible  to  technical  confounders,  including  RNA  degradation,  contamination,  and  mapping  bias-artifacts  not  adequately  addressed  by  conventional  quality  control  procedures  designed  for  total  expression  analysis.  Further,  most  analytical  frameworks  reduce  ASE  to  a  single  informative  SNP  per  gene,  discarding  valuable  multi-locus  information.  Critically,  while  ASE-based  outlier  detection  has  shown  promise  in  phenotypically  uniform  rare  disease  cohorts  (e.g.,  mitochondrial  disorders,  heart  and  muscular  disease),  it  has  not  been  systematically  extended  to  unsolved,  phenotypically  diverse  cohorts-where  existing  interpretation  frameworks  are  least  effective.First,  I  introduce  the  first  dedicated  quality  control  framework  for  allele-specific  expression  in  large-scale  RNA-seq  data.  Applied  to  over  15,000  GTEx  samples,  it  uncovers  previously  unrecognized  temporal  batch  effects  that  distort  ASE  and  splicing  signals,  ultimately  impairing  the interpretation  of  rare  regulatory  variants.Second,  I  introduce  an  outlier  detection  platform  that  leverages  haplotype-aware  ASE  by  aggregating  allelic  signal  across  phased  heterozygous  variants  within  genes,  allowing  for  robust  detection  of  aberrant  expression  imbalance  while  accounting  for  expected  allelic  variance  within  the  general  population.  Applied  to  GTEx  and  the  Multi-Ancestry  Gene  Expression  (MAGE)  dataset,  this  method  doubles  the  number  of  genes  amenable  to  ASE  outlier  detection  across  tissues  and  further  enables  the  discovery  of  ancestry-stratified  patterns  of  regulatory  constraint.  Benchmarking  in  known  rare  mendelian  muscular  disease  cohorts  confirms  improved  sensitivity  to  functional  regulatory  variation.Finally,  to  demonstrate  translational  impact  of  these  frameworks,  I  apply  these  frameworks  to  a  cohort  of  35  molecular  autopsy  patients,  each  of  whom  died  of  sudden  unexplained  death.  Analysis  of  ASE  data  obtained  from  cardiac  tissue  identified  rare  variants  exhibiting  significant  allelic  imbalance  and  transcriptional  signatures  indicative  of  pathophysiologic  processes  in  three  previously  unsolved  cases  ultimately  leading  to  improved  variant  prioritization.  These  results  underscore  the  utility  of  ASE-based  methods  for  resolving  cryptic  genetic  etiologies  in  phenotypically  heterogeneous  cases.The  aim  of  this  dissertation  is  to  advance  ASE  from  a  descriptive  signal  to  a  robust,  scalable,  and  interpretable  transcriptional  phenotype  with  broad  utility  in  variant  interpretation.  Through  the  development  of  ASE  quality  control,  haplotype-level  outlier  detection,  and  integrative  clinical  application,  this  dissertation  provides  a  generalizable  framework  for  leveraging  transcriptomic  allelic  imbalance  to  functionally  annotate  rare  genetic  variation  and  improve  diagnostic  yield  in  the  context  of  precision  medicine.
■590    ▼aSchool  code:  1179.
■650  4▼aBioinformatics
■650  4▼aComputer  science
■650  4▼aStatistics
■650  4▼aMedicine
■650  4▼aBiostatistics
■650  4▼aGenetics
■653    ▼aAllele-specific  expression  
■653    ▼aDNA-seq
■653    ▼aRNA  -seq
■653    ▼aStatistical  modelling
■653    ▼aTranscriptomics
■690    ▼a0715
■690    ▼a0984
■690    ▼a0463
■690    ▼a0564
■690    ▼a0369
■690    ▼a0308
■71020▼aThe  Scripps  Research  Institute▼bComputational  Biology/Bioinformatics.
■7730  ▼tDissertations  Abstracts  International▼g87-03B.
■790    ▼a1179
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17358485▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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