Show simple item record

dc.contributor.advisor Willard, Huntington F. en_US
dc.contributor.author Wheeler, Bayly Simpson en_US
dc.date.accessioned 2010-05-10T20:18:47Z
dc.date.available 2012-05-01T04:30:05Z
dc.date.issued 2010 en_US
dc.identifier.uri http://hdl.handle.net/10161/2476
dc.description Dissertation en_US
dc.description.abstract <p>Characterizing how genomic sequence interacts with trans-acting regulatory factors to implement a program of gene expression in eukaryotic organisms is critical to our understanding of genome function. One means by which patterns of gene expression are achieved is through the differential packaging of DNA into distinct types of chromatin. While chromatin state exerts a major influence on gene expression, the extent to which cis-acting DNA sequences contribute to the specification of chromatin state remains incompletely understood. To address this, we have used a fission yeast sequence element (L5), known to be sufficient to nucleate heterochromatin, to establish <italic>de novo</italic> heterochromatin domains in the <italic>S. pombe</italic> genome to address the role of DNA sequence in shaping the spatial and temporal propagation of heterochromatin. In this thesis, I describe a major effect of genomic sequences in determining spatial propagation of such <italic>de novo</italic> heterochromatin domains. I demonstrate that the sequence content of a genomic region plays a significant role in shaping its response to encroaching heterochromatin and suggest a role of DNA sequence in specifying chromatin state. Despite the role of DNA sequence in the spatial propagation of chromatin domains, I demonstrate that heterochromatin, once assembled, can propagate by an epigenetic signal, entirely independent of the original nucleating sequences. While the epigenetic signal is sufficient for maintenance and transmission of the heterochromatic state, it is insufficient for reestablishment of heterochromatin following its loss. Thus, these data demonstrate uncoupling of genomic and epigenetic signals necessary for the establishment, spatial propagation, and temporal propagation of chromatin states.</p> en_US
dc.format.extent 16605811 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US
dc.subject Biology, Genetics en_US
dc.title The Role of Genomic Sequence in the Spatial and Temporal Propagation of Heterochromatin en_US
dc.type Dissertation en_US
dc.department Genetics and Genomics en_US
duke.embargo.months 24 en_US

Files in this item

This item appears in the following Collection(s)

Show simple item record