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dc.contributor.authorWonnapinij, Passornen_US
dc.date.accessioned2014-03-14T20:10:28Z
dc.date.available2014-03-14T20:10:28Z
dc.date.issued2010-04-09en_US
dc.identifier.otheretd-04222010-001713en_US
dc.identifier.urihttp://hdl.handle.net/10919/27136
dc.description.abstractMitochondrial DNA (mtDNA) mutations have been widely observed to cause a variety of human diseases, especially late-onset neurodegenerative disorders. The prevalence of mitochondrial diseases caused by mtDNA mutation is approximately 1 in 5,000 of the population. There is no effective way to treat patients carrying pathogenic mtDNA mutation; therefore preventing transmission of mutant mtDNA became an important strategy. However, transmission of human mtDNA mutation is complicated by a large intergenerational random shift in heteroplasmy level causing uncertainty for genetic counseling. The aim of this dissertation is to gain insight into how human mtDNA heteroplasmy is inherited. By working closely with our experimental collaborators, the computational simulation of mouse embryogenesis has been developed in our lab using their measurements of mouse mtDNA copy number. This experimental-computational interplay shows that the variation of offspring heteroplasmy level has been largely generated by random partition of mtDNA molecules during pre- and early postimplantation development. By adapting a set of probability functions developed to describe the segregation of allele frequencies under a pure random drift process, we now can model mtDNA heteroplasmy distribution using parameters estimated from experimental data. The absence of an estimate of sampling error of mtDNA heteroplasmy variance may largely affect the biological interpretation drawn from this high-order statistic, thereby we have developed three different methods to estimate sampling error values for mtDNA heteroplasmy variance. Applying this error estimation to the comparison of mouse to human mtDNA heteroplasmy variance reveals the difference of the mitochondrial genetic bottleneck between these organisms. In humans, the mothers who carry a high proportion of m.3243A>G mutation tend to have fewer daughters than sons. This offspring gender bias has been revealed by applying basic statistical tests on the human clinical pedigrees carrying this mtDNA mutation. This gender bias may partially determine the mtDNA mutation level among female family members. In conclusion, the application of population genetic theory, statistical analysis, and computational simulation help us gain understanding of human mtDNA heteroplasmy inheritance. The results of these studies would be of benefit to both scientific research and clinical application.en_US
dc.publisherVirginia Techen_US
dc.relation.haspartWonnapinij_P_D_2010.pdfen_US
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectmutation level varianceen_US
dc.subjectoffspring gender biasen_US
dc.subjectKimura distributionen_US
dc.subjectmitochondrial genetic bottlenecken_US
dc.subjectsampling erroren_US
dc.titleTheoretical and Statistical Approaches to Understand Human Mitochondrial DNA Heteroplasmy Inheritanceen_US
dc.typeDissertationen_US
dc.contributor.departmentGenetics, Bioinformatics, and Computational Biologyen_US
dc.description.degreePh. D.en_US
thesis.degree.namePh. D.en_US
thesis.degree.leveldoctoralen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
thesis.degree.disciplineGenetics, Bioinformatics, and Computational Biologyen_US
dc.contributor.committeechairSamuels, David C.en_US
dc.contributor.committeememberDr. Edward J. Smithen_US
dc.contributor.committeememberDr. Ina Hoescheleen_US
dc.contributor.committeememberDr. Ronald M. Lewisen_US
dc.contributor.committeememberDickerman, Allan W.en_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-04222010-001713/en_US
dc.date.sdate2010-04-22en_US
dc.date.rdate2013-05-21
dc.date.adate2010-05-07en_US


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