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Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/25726

Title: Global Position Effects on the Epigenetics of Variegated Lentiviral Vector Expression in Embryonic Stem Cells
Authors: Khairandish, Arash
Advisor: Ellis, James
Department: Molecular and Medical Genetics
Keywords: Epigenetics
Retrovirus
Embryonic Stem Cells
Variegation
Viral Expression
Chromatin Structure
Lentivirus
Integration Site
Gene Therapy
Bioinformatics
Issue Date: 6-Jan-2011
Abstract: Lentivirus efficiently transduce stem cells, however are notably silenced in embryonic stem cells (ESC). Provirus can be silent, expressing, or variegated when clonal single copy ESCs spawn daughters that revert expression despite containing identical integration sites (IS) indicating epigenetic regulation. In the silent state, variegated provirus are bound by H1 and MeCP2, where H1 compensates for MeCP2 binding in DNA methylation null ESCs, consistent with a model of heterochromatin formation dependent on concentrations of its constituent components. ESC Variegation was hypothesized to result from spreading of nearby heterochromatin. Global IS analysis indicates Variegated IS favour gene deserts, repeat clusters, and LINEs while Expressers prefer gene density with stable modest expression and SINEs. Chromatin data does not support a role for the spread of heterochromatin possibly a consequence of the dynamic/dispersed nature of ESC heterochromatin. Variegation thus may depend on stochastic chromatin regulation by pluripotency factors at proximal genome organizing repeats.
URI: http://hdl.handle.net/1807/25726
Appears in Collections:Master
Department of Molecular Genetics - Master theses

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