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Epigenetic alterations produce heritable changes in phenotype or gene expression without changing
DNA
sequence. Modified levels of gene expression contribute to a variety of human diseases encompassing genetic disorders, pediatric syndromes, autoimmune disease, aging, and cancer. Alterations in proprotein convertase gene expression are associated with numerous disease states; however, the underlying mechanism for changes in PC gene expression remains understudied. Epigenetic changes in gene expression profiles can be accomplished through modification of chromatin, specifically via chemical modification of DNA bases (methylation of cytosine) or associated histone proteins (acetylation or methylation). In general, active chromatin is associated with low DNA methylation status and histone acetylation, whereas silenced gene are typically in inactive regions of chromatin exhibiting DNA hypermethylation and histone deacetylation. This chapter will provide in-depth protocols to analyze epigenetic alterations in proprotein convertase gene expression using the
PCSK6
gene in the context of human ovarian cancer as a model system.