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Chromatin remodeling is tightly controlled under physiological conditions. Alterations in chromatin structure are involved in the pathogenesis of neuronal systems. We found that the monoallelic deletion of CREB binding protein (CBP) results in the induction of ERG-associated protein with SET domain (ESET) and increases trimethylation of histone H3 (K9) and condensation of pericentromeric heterochromatin structure in neurons. Nested deletion and mutational analysis of the ESET promoter further demonstrated that the Ets-2 transcription factor regulates transcriptional activity of the ESET gene. In CBP+/- mice, Ets-2 occupancy in the ESET promoter DNA was markedly elevated. Our results suggest that CBP is a transcriptional repressor of ESET gene expression by limiting Ets-2 transcriptional activity, while CBP siRNA enhances basal and Ets-2-dependent ESET transcriptional activity. Altered expression of the ESET gene and hypertrimethylation of H3 (K9) correlate with striatal neuron atrophy and dysfunction in CBP+/- mice. These results establish an alternative pathway that loss of CBP leads to the pericentric heterochromatin condensation through ESET expression and trimethylation of H3 (K9).

Monoallele deletion of CBP leads to pericentromeric heterochromatin condensation through ESET expression and histone H3 (K9) methylation