Department of Cell and Developmental Biology; Department of Pathology; Department of Neurology; Department of Medicine
Biochemistry, Biophysics, and Structural Biology | Cell and Developmental Biology | Genetics and Genomics
This study reveals that high-copy satellite II (HSATII) sequences in the human genome can bind and impact distribution of chromatin regulatory proteins and that this goes awry in cancer. In many cancers, master regulatory proteins form two types of cancer-specific nuclear bodies, caused by locus-specific deregulation of HSATII. DNA demethylation at the 1q12 mega-satellite, common in cancer, causes PRC1 aggregation into prominent Cancer-Associated Polycomb (CAP) bodies. These loci remain silent, whereas HSATII loci with reduced PRC1 become derepressed, reflecting imbalanced distribution of UbH2A on these and other PcG-regulated loci. Large nuclear foci of HSATII RNA form and sequester copious MeCP2 into Cancer-Associated Satellite Transcript (CAST) bodies. Hence, HSATII DNA and RNA have an exceptional capacity to act as molecular sponges and sequester chromatin regulatory proteins into abnormal nuclear bodies in cancer. The compartmentalization of regulatory proteins within nuclear structure, triggered by demethylation of "junk" repeats, raises the possibility that this contributes to further compromise of the epigenome and neoplastic progression.
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DOI of Published Version
Cell Rep. 2017 Mar 21;18(12):2943-2956. doi: 10.1016/j.celrep.2017.02.072. Link to article on publisher's site
DNA methylation, breast cancer, cancer biomarkers, cancer epigenetics, centromere, nuclear structure, polycomb proteins, satellite heterochromatin
Hall, Lisa L.; Byron, Meg; Carone, Dawn M.; Whitfield, Troy W.; Pouliot, Gayle P.; Fischer, Andrew H.; Jones, Peter L.; and Lawrence, Jeanne B., "Demethylated HSATII DNA and HSATII RNA Foci Sequester PRC1 and MeCP2 into Cancer-Specific Nuclear Bodies" (2017). Open Access Articles. 3111.
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